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CEF speed contest Design Discussions - Page 30 Empty
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CEF speed contest Design Discussions

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Mad Re: CEF speed contest Design Discussions

Post  Ken Cook on Thu Mar 20, 2014 3:11 pm

While I've flown on .008's for a long time, I switched to .012's due to many line failures. They're just too fragile and there really isn't that much of a drag penalty using .012's vs. .008's. .008's work fine for stunt, but I suggest .012's for speed. They're not going to kink as bad and they just hold up far superior. Ken
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Mad Re: CEF speed contest Design Discussions

Post  OVERLORD on Fri Mar 21, 2014 5:26 am

I made up a steel control horn to get a bit of weight at the back. I was looking for a suitable L-shaped profile and I ended up dismantling my office furniture. The stops used to lock cabinet doors make a good base. For the piano wire, I first made a Z bend but then I had difficulties getting the control horn through the bends unless I made a larger hole and create some play. I made just an L bent with a retainer that was made out of a paperclip.

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Mad Re: CEF speed contest Design Discussions

Post  Cryhavoc on Fri Mar 21, 2014 4:58 pm

RknRusty wrote:Hi Mike
Don't worry, I'm just getting started too. Maybe we won't have time enough to overthink it into a kludge. lol! 
I think I'll try some of the 10 pound line. I have some .008 steel too, but have never flown 1/2A on steel, can work with the easiest.
Rusty

I agree, lack of time solves a lot of decisions. I just ordered a roll of 10 and 15 pound spectra off Amazon along with some other items I needed. One of those hopefully will work. I'd try to get some metal lines in but I'm tired of ordering stuff. Its sobering how much you need for a simple 1/2A when starting completely from scratch.

Mike

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Mad Re: CEF speed contest Design Discussions

Post  roddie on Sat Mar 22, 2014 3:46 pm

Finally getting some more painting done. Have you ever had a rattle-can that leaked like a sieve around the base of the valve.. dripping paint down the side of the can, all over your fingers and onto the floor? Welcome to my world.  Popcorn 

CEF speed contest Design Discussions - Page 30 3-22-110

Because I was a dummy.. and hinged my elevator prematurely.. I had to lay 2 pcs. of .031 music-wire along the hinge line and remove them after spraying..  Neutral 
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Mad Re: CEF speed contest Design Discussions

Post  RknRusty on Sat Mar 22, 2014 5:58 pm

Some Vaseline on a toothpick might have worked too.
Rusty

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Mad Re: CEF speed contest Design Discussions

Post  JPvelo on Sun Mar 23, 2014 6:21 am

Looks good Roddie!
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Mad Re: CEF speed contest Design Discussions

Post  getback on Sun Mar 23, 2014 6:48 am

bounce  Looking good there Roddie ,Man you put that together quick  Smoking  Got mine painted yesterday took about an 1.5 hour outside I am happy with it though have to do alittle touch up here and there , PIC not ....Eric Flying
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Mad Re: CEF speed contest Design Discussions

Post  OVERLORD on Sun Mar 23, 2014 8:21 am

Little sunday job: I added some tail lettering. Hopefully, the varnish will not spoil it.

CEF speed contest Design Discussions - Page 30 Imgp8413

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Mad Re: CEF speed contest Design Discussions

Post  Cribbs74 on Sun Mar 23, 2014 11:12 pm

Ok,

Here it is minus landing gear and control linkage. It weighs 4.6oz as it sits. Not sure if low weight is desirable or not?

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Mad Re: CEF speed contest Design Discussions

Post  roddie on Mon Mar 24, 2014 12:49 am

Cribbs74 wrote:Ok,

Here it is minus landing gear and control linkage. It weighs 4.6oz as it sits. Not sure if low weight is desirable or not?

CEF speed contest Design Discussions - Page 30 AEM2FR9l

Nice Ron!!! and also nice to see a hard-tank on it! If having lightweight is an advantage... I'm in trouble there. I'm a full 2oz. heavier than you.. and one ounce heavier than either of Jim's models. I built my Bearcat with it's proportions by "eye" and it's got a lot of wing and fuse area. The 17" span wing is just over 70 squares with a 6" root chord, tapering down to 2" at the tips.. no dihedral and is dead-flat 1/8" sheet balsa. The 1/4" balsa sheet fuse is almost 3.5" tall between the belly and the top of the canopy. I'm surprised that it doesn't weigh more than it does.

Have you figured outboard wingtip weight in yet? I didn't see a tip-weight in your photo.. unless you used a heavier outboard wing strut? That would be a neat way to accomplish it on a bipe. I was thinking .010" Brass sheet.
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Mad Re: CEF speed contest Design Discussions

Post  RknRusty on Mon Mar 24, 2014 1:27 am

roddie wrote:...If having lightweight is an advantage... I'm in trouble there. I'm a full 2oz. heavier than you.. and one ounce heavier than either of Jim's models. I built my Bearcat with it's proportions by "eye" and it's got a lot of wing and fuse area. The 17" span wing is just over 70 squares with a 6" root chord, tapering down to 2" at the tips.. no dihedral and is dead-flat 1/8" sheet balsa. The 1/4" balsa sheet fuse is almost 3.5" tall between the belly and the top of the canopy. I'm surprised that it doesn't weigh more than it does.

Have you figured outboard wingtip weight in yet? I didn't see a tip-weight in your photo.. unless you used a heavier outboard wing strut? That would be a neat way to accomplish it on a bipe. I was thinking .010" Brass sheet.
Here's where most of us guys are out of our area. At first I was thinking radically light. a butterfly with an engine. But I was overlooking the advantage of whipping up inertia for several reasons, one being penetrating the wind, and also resisting floating. That second part also speaks to the wing area, of which less is best. A flying knife is probably what we want. I think I have a good wing if it's not too wide at the root, about 47 squares and 2" tips. I don't know for sure, but it seems like more tip weight might be helpful here.

I haven't got but a couple of hours into this thing. My wing location is adjustable like those toy gliders we played with decades ago, and will be the last thing glued in place. It's been sitting ignored for two weeks now, so time is rushing up on me.

I'm going to laminate the stab/elevator to encase a gapless hinge. What you see here weighs about nothing. It may be too light.

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Mad Re: CEF speed contest Design Discussions

Post  JPvelo on Mon Mar 24, 2014 7:04 am

C'mon Rusty, you have plenty of time. A full week from today if I'm not mistaken!

Jim
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Mad Re: CEF speed contest Design Discussions

Post  RknRusty on Mon Mar 24, 2014 8:31 am

JPvelo wrote:C'mon Rusty, you have plenty of time. A full week from today if I'm not mistaken!

Jim
Oh don't worry, I'll get it in under the wire. Even if it kills me, tomorrow is the last day I'm working on the Yak. That was supposed to be yesterday but nothing I did worked. Just one of those days. Tomorrow is gonna be a great day!

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Mad Re: CEF speed contest Design Discussions

Post  Mark Boesen on Mon Mar 24, 2014 10:10 am

hey Rusty ( and everybody) i'm in the same boat, dragging my feet on this project as well, now i'm thinking since I got the wing and fuselage cut for a mustang to just go ahead and finish it, forget about the shoestring. i'm off Tuesday and its only gonna hit 27, so I think i'll pass on disc golf and do some building...I remember as a kid we could slap together a 1/2a kit in an afternoon (it probably looked like it) so I really think 2-3 evenings should be good.
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Mad Re: CEF speed contest Design Discussions

Post  Cribbs74 on Mon Mar 24, 2014 10:13 am

roddie wrote:
Cribbs74 wrote:Ok,

Here it is minus landing gear and control linkage. It weighs 4.6oz as it sits. Not sure if low weight is desirable or not?

CEF speed contest Design Discussions - Page 30 AEM2FR9l

Nice Ron!!! and also nice to see a hard-tank on it! If having lightweight is an advantage... I'm in trouble there. I'm a full 2oz. heavier than you.. and one ounce heavier than either of Jim's models. I built my Bearcat with it's proportions by "eye" and it's got a lot of wing and fuse area. The 17" span wing is just over 70 squares with a 6" root chord, tapering down to 2" at the tips.. no dihedral and is dead-flat 1/8" sheet balsa. The 1/4" balsa sheet fuse is almost 3.5" tall between the belly and the top of the canopy. I'm surprised that it doesn't weigh more than it does.

Have you figured outboard wingtip weight in yet? I didn't see a tip-weight in your photo.. unless you used a heavier outboard wing strut? That would be a neat way to accomplish it on a bipe. I was thinking .010" Brass sheet.

I plan on using a penny as tip weight.

As to the hard tank, I figured this is nothing like stunt so I wasn't too concerned about all the fuel delivery issues you experience in PA. Hopefully it works for 10 laps.

Ron
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Mad Re: CEF speed contest Design Discussions

Post  RknRusty on Mon Mar 24, 2014 10:28 am

Mark Boesen wrote:hey Rusty ( and everybody) i'm in the same boat, dragging my feet on this project as well, now i'm thinking since I got the wing and fuselage cut for a mustang to just go ahead and finish it, forget about the shoestring. i'm off Tuesday and its only gonna hit 27, so I think i'll pass on disc golf and do some building...I remember as a kid we could slap together a 1/2a kit in an afternoon (it probably looked like it) so I really think 2-3 evenings should be good.
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Mad Re: CEF speed contest Design Discussions

Post  Mark Boesen on Mon Mar 24, 2014 10:35 am

yep, it's go time!
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Mad Re: CEF speed contest Design Discussions

Post  roddie on Mon Mar 24, 2014 11:30 am

Cribbs74 wrote:
I plan on using a penny as tip weight.

Ron


I have never flown with lines this long, so I feel that a little more tip-weight than usual, might be needed to level-off the little model while it's hanging way out there. I am shooting for 5gr. The sheet-Brass tip-weight in the photo is .005" thick.. but only weighs 3gr... so I may make a second one for mounting them top/bottom. I'm using 2-sided adhesive/super-thin laminating film for attachment to the wing-tip.

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Mad Re: CEF speed contest Design Discussions

Post  Cribbs74 on Tue Mar 25, 2014 10:02 pm

I've got gear! Thanks Rusty!

5 separate pieces to make it up. I think I'll skip the pants and go commando...

All that's left is the tail skid, tip weight and the little triangle gear covers, they have a proper name, but it alludes me at the moment.

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Mad Re: CEF speed contest Design Discussions

Post  RknRusty on Tue Mar 25, 2014 10:07 pm

Hey that's pretty cool. See, it looks fine after all.
Rusty

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Mad Re: CEF speed contest Design Discussions

Post  Cribbs74 on Tue Mar 25, 2014 10:39 pm

Thanks Rusty,

The LG wheels and control rod bumped the weight to 5.1 oz.

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Mad Re: CEF speed contest Design Discussions

Post  JPvelo on Tue Mar 25, 2014 10:54 pm

Looking good Ron! I put a tail skid on both of mine and they got knocked off on the first landing. I have since switched to a small blob of epoxy.


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Mad Re: CEF speed contest Design Discussions

Post  Cribbs74 on Tue Mar 25, 2014 11:00 pm

JPvelo wrote:Looking good Ron! I put a tail skid on both of mine and they got knocked off on the first landing. I have since switched to a small blob of epoxy.


Jim

Funny you should mention that. The landing is really freaking me out. I am good with the slow ascend and overall speed, but that high speed landing is going to be a bear. I am glad the landing is after the timed 10 laps. As long as it's fast I only need to do it once. lol! 

I plan on pinning the skid into the fuse so hopefully is won't snap off.
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Mad Re: CEF speed contest Design Discussions

Post  roddie on Tue Mar 25, 2014 11:08 pm

Very cool Ron!!!! What kind of wheels are those? I like em' !!  Thumbs Up Man... you work well under pressure! I'm starting to sweat...  Warm  6 days left til' the photo deadline...

Just an idea for you... My tailskid is 1/16" music-wire with a U-bend.. and is pinned into the fuse with 2 toothpicks and a fiberglass screen patch epoxied over it. I usually make my tailskids robust because they serve as my stooge-link.

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Mad Re: CEF speed contest Design Discussions

Post  Cribbs74 on Tue Mar 25, 2014 11:12 pm

Thanks Roddie,

I think those wheels are 1" Perfect streamline wheels. I like them too as they remind me of Moon wheels from the 60's with those solid aluminum centers.

I plan on doing my skid much like you suggested
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