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"Cox .049 Marine inboard engine."

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Post  TD ABUSER Sun Mar 26, 2023 12:52 pm

Goozgog wrote:Hello TDA,

 Thanks for posting the link to the video.

 The video does show how capable a TD powered
plane can be BUT it's a miserable pattern.
I'm embarrassed by my bad flying.

 
Cheers! - K.


Chris..as the saying goes "your wonderful plane makes you look like a better pilot than you really are"..... Very Happy

Seriously...you're your own worst critic.
This seems to be the way many of my videos are presented too....typically my videos show one of the first flights the plane has ever had and  before I've had a chance to get both myself and my plane  "dialed in".
At Brodak I doubt The Judge had to come up to you and ask "WHAT THE HELL WAS THAT YOU JUST DID"...?


Last edited by TD ABUSER on Sun Mar 26, 2023 1:05 pm; edited 1 time in total
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Post  TD ABUSER Sun Mar 26, 2023 1:00 pm

andrew wrote:Wow!!  I must be daft as a turtle and twice as slow!!

I visit the RCU forum often, but not as frequently as CEF.  Obviously, there are many posters, myself included, who post in both forums with similar names.  However, I just made the connection this morning between combatpigg (RCU) and TD Abuser (CEF) -- thanks to the pictures of the Rumanian IAR 80.  Boy, do I feel like a dummy.  

Top of the morning to you, Chuck!

a--

Good morning Andrew..!
Here's a better look at this plane........
The more I see of it, the more I like it .
Next one I build..I should try to do a better job of sticking to "scale".

PAW .049 CONTROL LINE MODEL - Page 4 Rumani27
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Post  Goozgog Sun Mar 26, 2023 5:46 pm

PAW .049 CONTROL LINE MODEL - Page 4 Fw-19011

It might be good to show the handle
I use for the FW-190.
The only way to slow the controls down
for smooth steering was to have the lines
very close together at the handle.
That means my two middle fingers are
between them when I'm flying.

PAW .049 CONTROL LINE MODEL - Page 4 Halfa_12
PAW .049 CONTROL LINE MODEL - Page 4 Halfa_13



It works OK but takes getting used to.

The funny spool is my solution to keep
the Spectra lines from tangling.

Cheers! - K

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Post  TD ABUSER Sun Mar 26, 2023 6:38 pm

1.5 inches at the handle and your FW 190 is [shooting from memory] 2 7/8" line spacing at the bellcrank and the output from the bellcrank to the flap / elevator linkage is 1/2" ..and your model still turns tight corners.

I'll keep your line spacing recommendation "on file".
My usual set up for 1/2A "free style / goofing off" isn't too far from that.
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Post  TD ABUSER Sat Apr 22, 2023 2:56 pm

Here she sits at 11.5 ozs.
I'm going to make a heavy spinner nut so that the CG is more forward.
Will the PAW .049 pull it through all the stunts with a 6.3 x 4 at 13000 rpm...?

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Post  rsv1cox Sat Apr 22, 2023 3:20 pm

Wow nice! Slim and evil. I think you made a winner.
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Post  944_Jim Sat Apr 22, 2023 4:10 pm

Wow! You knocked it out of the park.

_________________
Never enough time to build them all...always enough time to smash them all!
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Post  TD ABUSER Sat Apr 22, 2023 7:24 pm

Thanks Guys..!
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Post  getback Sun Apr 23, 2023 5:48 am

Verty Nice TD ! I hope the maiden goes well for you , video or flight report Please Very Happy I Love This Forum!
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Post  Goozgog Sun Apr 23, 2023 6:16 am

I agree. It does look wicked!

I like the cowl too.
The plain aluminum looks
wartime austerity to me.

I'm eagerly looking forward
to a flight report !

Cheers! - K.
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Post  TD ABUSER Sun Apr 23, 2023 12:44 pm

Goozgog wrote:I agree. It does look wicked!

I like the cowl too.
The plain aluminum looks
wartime austerity to me.

I'm eagerly looking forward
to a flight report !

Cheers! - K.

Thanks Chris.
It shouldn't be too long before the flying begins,
I don't think we have put together 2 back to back days all year without rain.
I'm looking forward to being able to spend all my free time flying and zero time building a rental property.
I'm building the kitchen cabinets now and so the last big projects after that will be flooring and about 30 feet of cement walkway outside.
What a relief it will be....mainly because my "dry eye" condition takes the fun out of doing really dusty work...[like cabinet building, dry wall sanding, cement work, etc.]
Even balsa sanding sessions are a nightmare now.
I need to make a dust containment work station for sanding and even small spray paint jobs.
PAW .049 CONTROL LINE MODEL - Page 4 Rumani30
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Post  TD ABUSER Thu Apr 27, 2023 9:06 pm

THE GRUESOME FLIGHT REPORT
Well to begin, what I fly from is a well mowed combination of moss and pasture grass.
So I think take offs from the grass is a NO GO..plus I didn't want to add the weight of landing gear.
My one size fits all stooge works great with overpowered combat planes and it even works with this moderately powered IAR 80
The PAW .049 has been a disappointment with the compression backing off in flight and the needle valve having a mind of it's own too.
My home brewed 1:1:1 fuel probably isn't optimum.
The PAW was able to keep the 42 foot long lines tight for level laps..even when the rpms dropped to 3/4 power after a few laps.
I tried different props but the 6.3 x 4 seemed to be the best. There just wasn't enough line tension to try any stunts  at 42 feet.
After a launching SNAFU that required repairs I substituted a Norvel .074 / Hayes 2 oz tank for the PAW / metal tank.
Even though this .074 is a little bit worn out the difference is like night and day.
The PAW .049 and Norvel .074 are about the same weight..but the Hayes 2 oz tank is much heavier than the little soldered tin tank I made for the PAW.
After a few  really strong flights I did manage to have another launching SNAFU that required more repairs.
Now the plane weighs 13 ozs which qualifies it for ROCK ON A STRING STATUS...I believe.
The repairs went well...and tonights flights went pretty well too. I've got a "3/4 A" plane now to practice with.
IPAW .049 CONTROL LINE MODEL - Page 4 Iar_8010
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Post  Goozgog Fri Apr 28, 2023 4:23 am

Congratulations TD !

Yeah.. " A good engine makes a good airplane."
but you're flying so not all bad.
Smile

Cheers ! K
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Post  getback Fri Apr 28, 2023 5:09 am

Disappointing Success not all that bad , it's still in one piece just step up the power , would a .061 pull it you think and i believe its lighter ? Huh...
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Post  rsv1cox Fri Apr 28, 2023 6:49 am

I enjoyed reading your fight report. Would have been a pretty successful day for me bringing the plane home in one piece. Looks like nickles on the wing tip. Nice looking plane like that deserves quarters. Smile
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Post  TD ABUSER Fri Apr 28, 2023 9:28 am

Goozgog wrote:Congratulations TD !

Yeah..  " A good engine makes a good airplane."
but you're flying so not all bad.
 Smile

Cheers ! K

Something I never tried before....but actually worked very well.
After gluing the inboard wing panel back together it had at least 5 degrees of negative twist.
I decided to slit the bulkhead / spar lengthwise it's entire length.
This made twisting the wing panel back into rightness very easy and it was a simple matter to dribble thin CA along the slit to lock it down.
Recovering the wing.....I used nothing but butyrate dope...3 coats and was back flying within minutes.
I picked up some "Doctor Office Tissue" the other day and even though it is noticably heavier than the medium silkspan I've been using......
I've used it for patches and so far so good.
I think I'll try it with a .15 sized project.
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Post  TD ABUSER Fri Apr 28, 2023 9:35 am

rsv1cox wrote:I enjoyed reading your fight report.  Would have been a pretty successful day for me bringing the plane home in one piece.  Looks like nickles on the wing tip.  Nice looking plane like that deserves quarters.  Smile

Those are 3 pennies because at the Rumanian Fighter Plane factory we are on a strict budget.
The .074 and moving the leadouts back 1/4" from where I originally put them makes this plane pull pretty hard.
Next is to get the inside and outside response from the plane equalized.
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Post  TD ABUSER Fri Apr 28, 2023 9:42 am

getback wrote:Disappointing Success not all that bad , it's still in one piece just step up the power , would a .061 pull it you think and i believe its lighter ? Huh...

I would like to build another Rumanian Fighter [but keep it lighter] and use a Big Mig .061.
I need to find one first.

The thing is..the actual 1/2A STUNT CHALLENGE in my opinion is to use a Cox .049.
I should have enough parts laying around to come up with a TD that can turn a 6 x 3 at 15,000.
If so, I'd build a "profile" to get things sorted out....THEN do a built up fuselage version.
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Post  HalfaDave Fri Apr 28, 2023 10:08 pm

Hi CP,
Nice project, beautifly done. Thanks for sharing.
The (1.5cc) diesels I have seen go are finicky, but stump pullers, thrust wise.
I think you need to let them warm up real good, then set comp/needle and then launch.
(ask long haul truckers ! Smile )
A way different smell/noise/experience than any Cox type engines.
It is weird starting a diesel, I go to put the glow clip on and get confused... Smile
Take care,
Have fun,
Dave
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Post  Ken Cook Sat Apr 29, 2023 4:16 am

I found the PAW to be more than adequate. I also found the need to slow it down a bit.Your prop choice might have been holding the engine back a bit. The .049 likes to turn up a bit and wants to run in that happy spot. I use 5" props on mine.  

      There can be underlying issues as to why your light on line tension. So many things happened up to this point, diagnosing the issue is difficult now. One thing your not going to achieve with a glow vs a diesel is the engine rpm's through a maneuver. Some may argue this, but I feel your .074 is overpowering. This certainly could be why you claimed instant line tension while using it. While a diesel will maintain a consistent yet constant speed into a maneuver, the glow is going to want to speed up through the maneuver all the way to the exit of it.

         I know you mention the ability to do the stunt pattern. Take off and landing is a part of the stunt pattern and it's also a critical step. So are you just trying to fly the maneuvers or are you trying to fly a judged pattern when that time arrives? If one calculates the proper fuel load to do a correct stunt pattern, a few things happen. Your put on a time limit which means starting and finishing is imperative. Understanding your engine is critical because if one takes too long on the ground starting, your not going to make all of the maneuvers. If you even do all the maneuvers with the exception of ONE, you still lose all of your pattern points.

      Take off using a 1/2A is incredibly difficult. If the plane leaps off of the ground, and is in the air, this is a takeoff but not a proper takeoff.  Keeping the plane on the ground for a 1/4 lap is the accepted for a larger plane, this isn't going to happen with a 1/2A. Nonetheless, your putting in 6 level laps at this point after takeoff which offers the pilot the option to wave off the flight. If one pulls nose up into the wingover, the pattern officially begins.  If he or she isn't confident in a good engine run or something doesn't feel correct, they can raise their arm and take a attempt which offers the option of another flight.

     The maneuvers are orientated based on fuel load. Therefore, the maneuvers that are easier on the engines demands are done in the beginning of the flight. When the fuel load is burning off and the head pressure in the tank lessens, the engine is running leaner which enables all of the overhead maneuvers towards the end of the flight. The later maneuvers ( All maneuvers from the vertical eight and onward)  demand all of what the engine has to offer. This is why it's critical not to worry so much of a lot of line tension in level flight. YOU NEED IT UP TOP. If your plane is offering a lot of tension down low, it's going to be strangled up top in the overhead eight which will make the plane essentially fall out of the sky. One needs to find the happy medium. This is why rudder offset and engine offset is not a good idea. It hurts the plane in the overhead stuff due to losing speed. Consistent speed is what makes a good stunt plane. This is what makes a diesel a optimal choice as it doesn't wind up coming through the maneuvers.
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Post  TD ABUSER Mon May 01, 2023 5:33 am

Thanks for the replies Dave and Ken.
My biggest concern with the PAW .049 is to be sure it's getting the best fuel mix, to find the best prop and to keep the compression and needle adjustment from backing off in flight.
I fly in my back yard which is "well mowed pasture" and using landing gear for 1/2A would mean that I'd have to make a temporary runway. It's not out of the question..but I've got too many other things on the TO DO list.
I'll give the 5 x 3 prop a try. I've already tried the 6 x 3 and the engine didn't  respond as well as a dieselized COX .049 could.
This leads me to believe my fuel mix is wrong.
The IAR 80 is back in the hangar getting a stiffer firewall, a soldered tin uniflow tank and some round wing tips.
The PAW 049 has been relegated to test stand duty for now.

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Post  HalfaDave Mon May 01, 2023 12:48 pm

H CP,

The interest in diesels wained here when the LHS made more money selling us Cox/other glow fuel ! Smile
Plus, the ether leaks out way too easy from the fuel mix, before you get to use it.
They do run good. Way different to glow...

I like the 'low altitude' square wingtips of the Iar80...
Is that allot of line rake? Not sure, but that is allot of drag for a 1/2A engine....

I takes allot of repaired Ringmasters/FlightStreaks to get where you are... Cool
Thanks for sharing,
Take care,
Have fun,
Dave

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Post  TD ABUSER Mon May 01, 2023 1:20 pm

HalfaDave wrote:H CP,

The interest in diesels wained here when the LHS made more money selling us Cox/other glow fuel ! Smile
Plus, the ether leaks out way too easy from the fuel mix, before you get to use it.
They do run good. Way different to glow...

I like the 'low altitude' square wingtips of the Iar80...
Is that allot of line rake?  Not sure, but that is allot of drag for a 1/2A engine....

I takes allot of repaired Ringmasters/FlightStreaks to get where you are... Cool
Thanks for sharing,
Take care,
Have fun,
Dave


Dave I originally set the leadouts about 1/2 inch further forward but the plane got loose even with the .074 pulling it. Set where they are now the plane seems more trustworthy.
This is a pretty heavy model at 13 plus ounces....[I've built 2 channel 1/2A RC models that came out lighter.]
I think a lighter plane will require less line rake...given the same amount of power.
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