Cox Engines Forum
You are not logged in! Please login or register! Guests are limited to posting in the "General Questions (Guest Posting Allowed)" section only. Becoming a member is fast, easy and FREE!


Just got a PT 19 - Page 2 Babe_b10
Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Cox Engine of The Month
August-2019
fredvon4's

"Tee Dee .049"



PAST WINNERS
CEF Traveling Engine

Win This Engine!
The Traveling Prop
Gallery


Just got a PT 19 - Page 2 Empty
World of Aviation

Just got a PT 19

Page 2 of 3 Previous  1, 2, 3  Next

Go down

Happy Re: Just got a PT 19

Post  TLAnderson on Sun 14 Aug 2016 - 20:51

Thanks for all the great info. I do have a couple of 6 x 3.5 RH props. I put one of those on this morning, glued the crack in the nose, and went flying. I got one flight in, but the wind was too high. The lines were going slack on me on the windward side. Didn't crash it though. Very Happy
The issue with the firewall moving around is hopefully going to get fixed. I have a new one incoming from ebay. I just realized today that the flanges on the firewall that hold the top of the engine backplate in, are broken off. The only thing holding the engine to the firewall are the two screws.

Just got a PT 19 - Page 2 Dsc00811

Just got a PT 19 - Page 2 Dsc00810

I'm hoping the new firewall will fit the grooves in the fuse tighter, and not move around so easy.

I think I'm going to try one of those 3 bladed LH props from Cox International. The five inch prop will give even more ground clearance for one thing.

I just flipped the RH prop with my finger today. I won't be taking the LH spring starter off.

I'll probably be making one of those stooges also, just in case the wife gets tired of getting sprayed with castor oil.

I'm thinking of making some kind of launch dolly for my Testors planes, as neither one has landing gear. If anyone has pics of launch dollys that they have made, I'd be interested in seeing them.


Last edited by TLAnderson on Mon 10 Jul 2017 - 21:49; edited 1 time in total
TLAnderson
TLAnderson
Gold Member
Gold Member

Posts : 156
Join date : 2016-07-21
Location : Northern Wisconsin

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  balogh on Mon 15 Aug 2016 - 0:39

Oldenginerod wrote:Pretty certain the 6X2 LH prop is standard original fitment on some model PT-19s.

With the known practice of COX to swap engine and kit components, it may well be so. Anyway, in these original COX documents you see the PT 19 with RH props only.

https://www.coxengineforum.com/h24-instruction-sheets
balogh
balogh
Diamond Member
Diamond Member

Posts : 2359
Join date : 2011-11-06
Age : 60
Location : Budapest Hungary

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  getback on Mon 15 Aug 2016 - 2:28

getback
getback
Top Poster
Top Poster

Posts : 6095
Join date : 2013-01-18
Age : 62
Location : julian

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  roddie on Mon 15 Aug 2016 - 10:32

FWIW.. take-off dollies are generally used with powerful "speed" models. It's tough to build a dolly that's lightweight enough for a sport-model to get rolling fast enough to gain lift. After a few feet.. the dolly also wants to track straight.. which will pull on the lines. This will slow a sport-model down and it might even tip and fall off the dolly.

I'm not implying that it can't be done.. but there's definitely a bit of engineering that goes into making one work. Also.. they tend to be custom-built to fit a particular model..

Here's a photo of a "dynajet-powered" speed-model and it's dolly..

Just got a PT 19 - Page 2 From_i10

And another type that looks less complicated.. and lighter in weight.

Just got a PT 19 - Page 2 From_i11

If you know how to braze; a wire clothes-hanger could be bent/formed into a tail-dragger type cradle. Make a single "tail-wheel" that can have it's strut adjusted so as to track close to the radius of your flight-circle.

A note of caution though.. Your Testors models may only have enough power for a hard/smooth pavement roll-out using a dolly. Large diameter foam wheels on the dolly might work on a short grass field. It all depends on getting enough speed up to generate lift.
roddie
roddie
Top Poster
Top Poster

Posts : 6593
Join date : 2013-07-17
Age : 59
Location : N. Smithfield, Rhode Island

View user profile http://www.stilburnin.com

Back to top Go down

Happy Re: Just got a PT 19

Post  TLAnderson on Mon 29 Aug 2016 - 0:01

Got the new firewall last week. It seems to be as loose fitting as the old one, so I guess it's the grooves in the fuselage that are worn. If I put enough rubber bands on it, it will stay in place well enough to fly. Got the three blade LH props from Cox International on Saturday. Put one on and went flying today.

Just got a PT 19 - Page 2 Dsc00813

Just got a PT 19 - Page 2 Dsc00812

Just got a PT 19 - Page 2 Vlcsna10

It really wants to lift the outboard wing in the wind. I'm going to try a little tip weight for the next flight.
TLAnderson
TLAnderson
Gold Member
Gold Member

Posts : 156
Join date : 2016-07-21
Location : Northern Wisconsin

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  getback on Mon 29 Aug 2016 - 7:54

Cool TL looks like your having some fun there with the PT on the lines Airplane Its cooling off a bit here and I cant wait to get out and do some circles , got some planes to maiden too want to get my son into balsa planes he's starting to et an interest and I want to keep him going . Glue you a nickel on the under side of out board wing tip . Thanks for sharing keep us updated . Eric Thumbs Up
getback
getback
Top Poster
Top Poster

Posts : 6095
Join date : 2013-01-18
Age : 62
Location : julian

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  roddie on Tue 30 Aug 2016 - 21:08

Yea.. you must have had a fairly strong breeze come-up.. to feel the model wanting to "come-in" towards you. Don't hesitate to take a step or two back.. while keeping a stiff-wrist when that happens. Watch what the model does. I realize that it happens in short order... but the best move is to recover to level-flight.. regain composure for a lap.. and re-assess if it's too windy to fly any fancy stuff. If so; it's better to fly-out the tank "level" the best you can .. and land.

The L/H props that you're using are a great training tool. When you switch to R/H props.. you'll feel the difference in how the model fly's.. and how you need to trim it.. to keep it tight on the lines. One method is to move the line-guides rearward on the inboard wing. This points the "nose" out-board a bit. That's a good place to start.. because most designs already have the engine-thrust and rudder-offset figured-in.

It's a lot of fun figuring it out with small 1/2A C/L models... (especially the cheap to build profile designs) because they can be built and finished usually in a weekend!!
roddie
roddie
Top Poster
Top Poster

Posts : 6593
Join date : 2013-07-17
Age : 59
Location : N. Smithfield, Rhode Island

View user profile http://www.stilburnin.com

Back to top Go down

Happy Re: Just got a PT 19

Post  Ken Cook on Wed 31 Aug 2016 - 15:56

I would investigate the wing. Look at the wings from the rear. Stand behind the plane nose pointing into the floor. Sight the wings from trailing edge to high point of wing. It sounds like your outboard wing is down or your inboard wing is twisted up. It could also be a combination of both. Sight the wings from the left side ad the right side holding the plane out in front of you level, sight down the leading edge and then the trailing edge. Check to see if they're even straight which I would be very surprised if they were. A heat gun twisting the opposite direction can fix your problems. You can also melt the wing so use subtle heat and keep holding the opposing direction until cooled.

               If the plane is flying outboard tip high, the end result is what your experiencing. Tip weight isn't going to resolve this problem. It will aid but it can cause other issues. Having a trained eye outside of the circle certainly helps. If you don't have that resource, pay careful attention to the outboard wing during level flight. You shouldn't be able to see it . Ken
Ken Cook
Ken Cook
Top Poster
Top Poster

Posts : 3582
Join date : 2012-03-27
Location : pennsylvania

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  TLAnderson on Wed 31 Aug 2016 - 23:14

Thanks for the helpful info from Roddie and Ken Cook. I'll check the wing out for warps.

One thing I've noticed when flying the plane is that it seems too fast. I feel like I can't enjoy flying it because all I'm doing is trying to hold it down on the upwind side, and keep it from diving into the ground on the downwind side. I'd like to slow it down, make it less twitchy. and enjoy the flight. I have it on 30 foot lines. Maybe longer lines would help, but it's already going slack on the crosswind side. I'm going to try running the engine a little richer, put the prop on backwards, and see what that does.

Maybe this is a dumb idea, but I was thinking of making some flaps out of some type of plastic, that I could attach to the trailing edge of the wing. My thinking is that this would increase the drag, thereby slowing the plane down, and also increase the lift at lower speeds, to keep the plane from stalling. Anyone tried this?

TLAnderson
TLAnderson
Gold Member
Gold Member

Posts : 156
Join date : 2016-07-21
Location : Northern Wisconsin

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  roddie on Thu 1 Sep 2016 - 23:09

TLAnderson wrote:Thanks for the helpful info from Roddie and Ken Cook. I'll check the wing out for warps.

One thing I've noticed when flying the plane is that it seems too fast. I feel like I can't enjoy flying it because all I'm doing is trying to hold it down on the upwind side, and keep it from diving into the ground on the downwind side. I'd like to slow it down, make it less twitchy. and enjoy the flight. I have it on 30 foot lines. Maybe longer lines would help, but it's already going slack on the crosswind side. I'm going to try running the engine a little richer, put the prop on backwards, and see what that does.

Maybe this is a dumb idea, but I was thinking of making some flaps out of some type of plastic, that I could attach to the trailing edge of the wing. My thinking is that this would increase the drag, thereby slowing the plane down, and also increase the lift at lower speeds, to keep the plane from stalling. Anyone tried this?


If you're flying in breezy weather.. then it's always going to be a challenge with a small airplane. It's tempting to fly a model that's "good to go".. the engine starts easily.. and you're psyched to fly. Shorter lines will give you more control.. but the lap-time (speed) increases. I personally would shorten the lines by 3-5 feet.. and keep the prop as-is. Keep the engine running in it's power-curve. Better to have the available power there.. and get used to a faster lap-time. The PT19 is a relatively heavy model that needs it's engine running strong. You'll feel more in control.. even though the model is flying faster. It will respond faster to your control inputs. Try setting the engine-mount in the trainer position. I know that you mentioned that there's some issues with that on your model. If that setting is "wavering" between flights.. it will fly differently. Strange that the new mount exhibits the same behavior..  Huh... One thing you could try.. is removing the mount.. clean the contact areas with alcohol and put a strip of tape over the top of the mount; where it contacts the ridges in the underside of the fuse. Use tight-fitting rubber-bands when you re-install it. This should "shim" the fit and hold the setting. The "expert" setting of the mount is fine.. as long as you're used to it. I feel that the model flies better on the expert setting. It really needs to fly fast.. to fly well.

Also.. keep the line-spacing at your handle as close as possible to the spacing on the model's bellcrank.. a 1:1 ratio is what you want. Check the location of the pushrod on the elevator horn too. There are two positions on my PT19. The "outer" position (furthest from the hinge-point) is the least sensitive.. but you may want faster control-input than that. Hopefully your wing is straight. Check it.. as Ken mentioned. A wing-warp will cause you trouble.. and no amount of skill can overcome that.

The old standard material for 1/2A size lines was "Dacron". If that's what you're using; consider switching to 15# "braided" fishing-line. "Spectra" or "Spider-Wire". A 110 yard reel will supply you with dozens of line-sets for your 1/2A flying models over the years. There's a special knot (Palomar/5-turn) that you'll need to learn how to tie, for safe/secure terminations.. but it's less "stretchy" than Dacron.. which translates to more positive control. It will surely make a difference in your flying!

Balsawood 1/2A models are SUPERIOR to the plastic "ready to fly" ones. They may not look as nice.. but you'll feel the difference in performance immediately! Consider building a Sig Manufacturing Products "Skyray".. It's currently available.. and can use the same engine as in your PT-19.. with the addition of a little tin wedge-tank. It will be capable of performing stunts.. such as inverted-flight.. loops.. and more. Something to aspire to!  

Below.. the Sig Skyray! (I have this kit; yet to be built) Sig has excellent quality fuel for your Cox engine. Their "Champion 25" is available in pints, quarts and gallons. It's a 25% nitro fuel with a combination of castor and synthetic oils that's proven to protect your Cox engine.. while providing excellent performance. The kit ($16.00) and a quart of fuel ($8.39) wouldn't set you back much.. probably a little over $30 with shipping from Iowa to Wisconsin. Of course you'd need a few extra items like a fuel tank, glue and paint.. but those things are easy to obtain and cheap. The Skyray has no landing-gear.. so it requires a "pitman" to toss it into the air. Alternately.. you can add gear and launch with the aid of a "stooge" for when you don't have a helper. Easy to make one.. we'll provide info. if you're interested. You can use it to launch your PT19 too.

Just got a PT 19 - Page 2 Yy1sig10

I was psyched to see the photo of you "out there" flying your PT19! Be patient.. and experiment. It's all good.. and it gets better; the more that you fly!
roddie
roddie
Top Poster
Top Poster

Posts : 6593
Join date : 2013-07-17
Age : 59
Location : N. Smithfield, Rhode Island

View user profile http://www.stilburnin.com

Back to top Go down

Happy Re: Just got a PT 19

Post  TLAnderson on Mon 5 Sep 2016 - 21:58

Another interesting and informative post, Roddie. Thanks. I'm thinking that a Skyray or Brodak Basic Trainer would be a nice first build project.

Too windy to fly the last few days. I threw together a rough and quick stooge today. Have to wait for the wind to calm down to try it out.

Just got a PT 19 - Page 2 Dsc00812


Just got a PT 19 - Page 2 Dsc00810


Just got a PT 19 - Page 2 Dsc00811
TLAnderson
TLAnderson
Gold Member
Gold Member

Posts : 156
Join date : 2016-07-21
Location : Northern Wisconsin

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  Cribbs74 on Mon 5 Sep 2016 - 22:41

That's a great looking stooge, your rough one is better than mine...

Hope you don't expect that PT to take off in that grass!

Ron
Cribbs74
Cribbs74
Moderator

Trusted Seller
Posts : 10488
Join date : 2011-10-24
Age : 45
Location : Tuttle, OK

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  TLAnderson on Mon 19 Sep 2016 - 23:08

Got some more air time the other day. I Gorilla taped a nickel to the outboard wing for some tip weight, and it made an amazing difference in the way the plane flew. No more slack lines.

Just got a PT 19 - Page 2 Dsc00813


The stooge worked well. Here's a shot of the plane running, ready to be released from the stooge.
Just got a PT 19 - Page 2 Vlcsna10


Released from stooge, starting takeoff roll. Takes about 1/4 of the circle to get off the ground.

Just got a PT 19 - Page 2 Vlcsna11


In the air. Got 4 flights in before it got dark. The moon was up, and it was a beautiful evening for flying.
Just got a PT 19 - Page 2 Vlcsna12

Just got a PT 19 - Page 2 Vlcsna13



Not sure what effect that 12" of paracord has on the flight characteristics, but it didn't seem to hurt anything.

Sorry about the lo res photos. They are captures from a video taken with a VHS video camera. Had to copy the videotape to a DVD, then convert segments of the video to mpg files, then capture stills. Seems to have lost some quality in the process.
TLAnderson
TLAnderson
Gold Member
Gold Member

Posts : 156
Join date : 2016-07-21
Location : Northern Wisconsin

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  getback on Tue 20 Sep 2016 - 9:22

Thanks for taking the time to make the pics. for us >> Good to see your getting some air time in on that ole pt-19 and that the wing weight made the plane stop coming in on you , that can bee a scary thing for sure . Yep you'll bee ready for some balsa fling by next spring . Airplane Thumbs Up
getback
getback
Top Poster
Top Poster

Posts : 6095
Join date : 2013-01-18
Age : 62
Location : julian

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  TLAnderson on Fri 14 Oct 2016 - 23:19

Haven't had a chance to fly the PT 19 much lately. Weather's been windy and unsettled. Tried it last night, but the @#$% thing wouldn't run right. Lost the daylight trying to get it to run. Brought it home, pulled the fuel line, and found a piece of lint or something blocking the fuel inlet. Cleaned that out, and it ran fine. Course it was dark by then.



Last edited by TLAnderson on Thu 6 Jul 2017 - 23:13; edited 1 time in total
TLAnderson
TLAnderson
Gold Member
Gold Member

Posts : 156
Join date : 2016-07-21
Location : Northern Wisconsin

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  roddie on Sat 15 Oct 2016 - 14:06

Good flight  Thumbs Up  Love the stooge-launch too.

That sucks about the fuel-line obstruction.. but at least you found the problem.. and it was a simple thing. You mentioned it flying much better after attaching a tip-weight when running a R/H prop. That's great! Unless anyone had the original 6 x2 L/H prop.. they'd likely install a R/H prop to fly the model.. and struggle (run backwards.. Shocked ) if it got breezy! I've done that "dance-step" more than once.. Laughing
roddie
roddie
Top Poster
Top Poster

Posts : 6593
Join date : 2013-07-17
Age : 59
Location : N. Smithfield, Rhode Island

View user profile http://www.stilburnin.com

Back to top Go down

Happy Re: Just got a PT 19

Post  TLAnderson on Tue 8 Nov 2016 - 21:51

Thought I'd do an update. Haven't posted in a while. Got a chance to fly the PT 19 last Saturday. Wasn't expecting the weather to be so good this time of year up here. I had several failed takeoffs due to running out of runway before the plane became airborne. I changed the prop from the 5x3 left handed 3 blade, to a right handed 2 blade 6x3.5, and it woke right up. Only required about a 10 foot roll to get airborne. After I got it to fly, another problem showed up.

I had broken the tail skid off in a hard landing previously, and had jerry rigged a tail wheel onto it.
Apparently the tail wheel setup was a little too heavy, and had made the plane tail heavy. I had to hold down elevator just to keep the plane level. A gust of wind came up and I couldn't hold it down. The plane went straight up, the lines went slack, and she corkscrewed right into the ground.

Fortunately, It just popped apart without any serious damage. The firewall poked a hole in the fuel tank, but I was able to put the plane back together, and fly it a few more times. It didn't run too long with the leaky tank, but I could get about a minute and a half out of it.

I epoxied the tank later, and she's ready to fly again. Every flight is a learning experience. Hopefully I'll get a few more flying days before winter blows in.
TLAnderson
TLAnderson
Gold Member
Gold Member

Posts : 156
Join date : 2016-07-21
Location : Northern Wisconsin

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  getback on Wed 9 Nov 2016 - 9:05

Greenie for you man good to hear your getting out to the field before the gray sky comes , thats one thing with the plastic fly apart planes when ya hit the ground they just come apart and you rubber band them together again , go fly lol! Balsa not so Sad
getback
getback
Top Poster
Top Poster

Posts : 6095
Join date : 2013-01-18
Age : 62
Location : julian

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  TLAnderson on Sun 19 Feb 2017 - 21:29

Well, those flights I got in on November 8th were the last ones before winter arrived. Now, the sun is back, we've got some daylight in the afternoon, and I'm waiting for it to warm up enough to get out and fly the PT 19 again. I did a couple of mods to the plane and the stooge to try to get ready if we get a warm windless day.

I put some wire leadouts on it, as the dacron ones made me nervous, and I couldn't easily remove them from the bellcrank if I wanted to take the wing off.

Just got a PT 19 - Page 2 Leadou10

Just got a PT 19 - Page 2 Dsc00810


We'll see how long they hold up.

I also twisted up a piece of wire to hook the plane up to the stooge. Had to drill a couple of 1/8" holes in the fuselage to attach the wire to the plane. Hopefully, it's not too heavy.

Just got a PT 19 - Page 2 Tailho10


Just got a PT 19 - Page 2 Dsc00811

You can also see in the last pic, the mod I did to the stooge. I wanted to make it heavier, so it wouldn't slide around when I pulled the release line. I got a piece of steel from work, drilled and tapped four 5/16-18 holes in it, and bolted the stooge to it. Don't think it'll slide now, it probably weighs 10 pounds. Smile

Hopefully these mods won't cause more problems than they solve. Just have to wait for a good day now and find out.
TLAnderson
TLAnderson
Gold Member
Gold Member

Posts : 156
Join date : 2016-07-21
Location : Northern Wisconsin

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  Marleysky on Sun 19 Feb 2017 - 22:44

Great job on the weighted stooge! The wire loop looks good too, flight testing will tell if it's to heavy or not. RC Plane
Marleysky
Marleysky
Diamond Member
Diamond Member

I Support My Forum

Posts : 2273
Join date : 2014-09-28
Age : 66
Location : Grand Rapids, MI

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  Oldenginerod on Mon 20 Feb 2017 - 15:13

I cringed a little when I saw the hole drilled in the fuselage. Don't think I'd do that to a PT-19 if I could get hold of one.
To attach to a stooge, you should be able to tie a cord to a fixed point on the stooge, run it over the stabilizer one side, pass it under the fuselage and back to the stooge over the other side stabilizer, where it connects to the release pin. Of course you'd need to make sure you avoided any potential traps where the cord would jam, but it would do away with the need for an attachment on the plane and adds no flight weight. Pull the pin and the cord just unwraps from around the plane as it moves off, leaving the cord attachecd to the stooge. You'd probably need to experiment with different types of cord/string.

Rod.
Oldenginerod
Oldenginerod
Diamond Member
Diamond Member

Posts : 2616
Join date : 2012-06-15
Age : 56
Location : Victoria, Australia

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  roddie on Mon 20 Feb 2017 - 17:01

I see a couple of things that you might want to watch out for. The newly attached wire for the stooge-link looks pretty heavy to me.. possibly as heavy as the tail-wheel that you'd made-up. I'd go back to using the para-cord tied through an alternate hole drilled just above where the tail-skid was. It shouldn't interfere with the stabilator in that location.

Issue #2; You have 1" less clearance between the prop and the ground now that you're running a 6" prop. With a taller stooge; the tail will "pitch-up" once you start the engine.. and the prop could strike the ground. Even if there "is" enough prop-clearance, the model will release "tail-high". Having small wheels; if the runway is rough, you could experience nose-overs which are very frustrating. Ask me how I know... Doh!

Your stooge design/build is really nice.. and I feel that you'd have no problem building another type that's a little different.. and requires no links whatsoever to the airplane.

Here's a few pics..

Just got a PT 19 - Page 2 Flyboy10
Just got a PT 19 - Page 2 Flyboy11
Just got a PT 19 - Page 2 Flyboy12
Just got a PT 19 - Page 2 Flyboy13

Either way; if you need to "weight" a stooge for placing it on hard pavement, find an iron dumbbell/barbell plate to anchor the stooge using a rear-extension with a "pin" through the weight. In conjunction with the weight; you can also drive a few wall-board screws through your stooge's base, so that they protrude through the bottom (1/8" to 1/4") enough so that they "dig-in".. to prevent the base from moving when you pull the cord. Make the extension for the barbell-weight long enough to accommodate heavier plates for launching more powerful/larger models. Once the model is airborne, you can take a few steps back for landing-clearance. You don't want to "grease a landing"....... only to smash into your stooge.. Laughing Laughing Shocked
roddie
roddie
Top Poster
Top Poster

Posts : 6593
Join date : 2013-07-17
Age : 59
Location : N. Smithfield, Rhode Island

View user profile http://www.stilburnin.com

Back to top Go down

Happy Re: Just got a PT 19

Post  TLAnderson on Mon 20 Feb 2017 - 19:02

Oldenginerod wrote:I cringed a little when I saw the hole drilled in the fuselage.  Don't think I'd do that to a PT-19 if I could get hold of one.
To attach to a stooge, you should be able to tie a cord to a fixed point on the stooge, run it over the stabilizer one side, pass it under the fuselage and back to the stooge over the other side stabilizer, where it connects to the release pin.  Of course you'd need to make sure you avoided any potential traps where the cord would jam, but it would do away with the need for an attachment on the plane and adds no flight weight.  Pull the pin and the cord just unwraps from around the plane as it moves off, leaving the cord attachecd to the stooge.  You'd probably need to experiment with different types of cord/string.

Rod.

I did have to talk myself into drilling those holes, however, I bought this plane to fly, not as a collectors item. I'm putting the plane at risk of destruction every time I fly it, so I finally decided that a couple of holes were acceptable.

I did try the cord around the fuselage method, but the stabilizer seemed to catch the cord every time. I couldn't see a way to avoid it.
TLAnderson
TLAnderson
Gold Member
Gold Member

Posts : 156
Join date : 2016-07-21
Location : Northern Wisconsin

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  TLAnderson on Mon 20 Feb 2017 - 19:40

roddie wrote:I see a couple of things that you might want to watch out for. The newly attached wire for the stooge-link looks pretty heavy to me.. possibly as heavy as the tail-wheel that you'd made-up. I'd go back to using the para-cord tied through an alternate hole drilled just above where the tail-skid was. It shouldn't interfere with the stabilator in that location.

Issue #2; You have 1" less clearance between the prop and the ground now that you're running a 6" prop. With a taller stooge; the tail will "pitch-up" once you start the engine.. and the prop could strike the ground. Even if there "is" enough prop-clearance, the model will release "tail-high". Having small wheels; if the runway is rough, you could experience nose-overs which are very frustrating. Ask me how I know... Doh!


Your stooge design/build is really nice.. and I feel that you'd have no problem building another type that's a little different.. and requires no links whatsoever to the airplane.
Either way; if you need to "weight" a stooge for placing it on hard pavement, find an iron dumbbell/barbell plate to anchor the stooge using a rear-extension with a "pin" through the weight. In conjunction with the weight; you can also drive a few wall-board screws through your stooge's base, so that they protrude through the bottom (1/8" to 1/4") enough so that they "dig-in".. to prevent the base from moving when you pull the cord. Make the extension for the barbell-weight long enough to accommodate heavier plates for launching more powerful/larger models. Once the model is airborne, you can take a few steps back for landing-clearance. You don't want to "grease a landing"....... only to smash into your stooge.. Laughing Laughing Shocked

All good points Roddie. I'm hoping for some good weather soon, so I can find out if any of these mods were worth doing.  I like that stooge design that you showed. I'll probably have to make something like that. I'm going to try holding full up elevator when I release the plane from the stooge, and hopefully, it will not nose over.  I guess I could flip the stooge over on the steel block so that the wood is on the bottom. Just have to redrill a couple of holes to reposition the stooge on the block.
If the wire turns out to be too heavy, I'll try running some small diameter cord through the holes, and hook that to the stooge. I mainly wanted to get away from having 12'' of paracord flipping around behind the plane while it was in flight.

Thanks for the responses. I've picked up some good information from this site. Lots of expertise here.
TLAnderson
TLAnderson
Gold Member
Gold Member

Posts : 156
Join date : 2016-07-21
Location : Northern Wisconsin

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  getback on Mon 20 Feb 2017 - 19:44

Huh... You're looking pretty good But : as was said .. Me i would remove the copper wire .. now you have two holes .. put your cord (Twine) through it and lead back to a loop knot that won't slip attach it to your Very Nice Made Stoge !! And go fly !! I Love This Forum!   I made one of the Stoges that Roddie is talking of but have not got to try it Just got a PT 19 - Page 2 Melon_11
Just got a PT 19 - Page 2 Melon_10  See how the cord is hooked ? I also hang them in my room from the wall so each plane has it's own cord (line chalk stripping string from say Lowes is fairly cheap and a lot of it )( colors too!) Very Happy Soory i was typing while you wee talking LOL , ck. your CG at about 3/4" from wing tip , fix the prob. now may save ya some greef Sad


Last edited by getback on Mon 20 Feb 2017 - 20:01; edited 1 time in total (Reason for editing : talk)
getback
getback
Top Poster
Top Poster

Posts : 6095
Join date : 2013-01-18
Age : 62
Location : julian

View user profile

Back to top Go down

Happy Re: Just got a PT 19

Post  Sponsored content


Sponsored content


Back to top Go down

Page 2 of 3 Previous  1, 2, 3  Next

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum