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CEF speed contest Design Discussions - Page 2 Empty

CEF speed contest Design Discussions

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Mad Roddie's F8F-2 "Rare-Bear"

Post  roddie Wed Nov 13, 2013 10:33 pm

My F8F's "short nose" forced me to get creative... I'm going to try experimental dual l/g mounts, in a central hardwood l/e (flat-spar) section of the wing... (It's the dark-wood strip in the photo, approx. 40% of the w/s)... to accomplish 3 things; add "functional" weight forward of the c/g, (l/e spar), gain a more scale-like appearance for the gear... and also places the gear struts near the c/g; allowing for c/g trimming with fore/aft. adjustments.

I hope to "further" trim the c/g with different push-rod materials.
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Mad Re: CEF speed contest Design Discussions

Post  RknRusty Thu Nov 14, 2013 12:24 am

I wish the Cox Hyper Viper was a real plane so I could do a scale speedster of it. Off to look at airplane pictures.

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Mad Re: CEF speed contest Design Discussions

Post  duke.johnson Thu Nov 14, 2013 8:58 am

I've spent a lot of time looking at pictures and blowing them up to see how they look.
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Mad Roddie's F8F-2 "Rare-Bear"

Post  roddie Thu Nov 14, 2013 9:09 pm

The only thing I find more tedious than slotting hinges, is joining a split-elevator...

CEF speed contest Design Discussions - Page 2 11-15-10
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Mad Re: CEF speed contest Design Discussions

Post  Kim Fri Nov 15, 2013 3:52 am

Looks Great !!!!
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Mad Re: CEF speed contest Design Discussions

Post  JPvelo Fri Nov 15, 2013 6:23 am

I spent time blowing up drawings yesterday, should be cutting wood Monday.
CEF speed contest Design Discussions - Page 2 HgWYKQy

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Mad Re: CEF speed contest Design Discussions

Post  Kim Fri Nov 15, 2013 6:34 am

I DO believe that we're gonna have an interesting field of competitors !!!!

This and Ron's Flight Contest ought to make for some exciting articles in Bernie's next "Cox Engines Quaterly" !!!
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Mad Re: CEF speed contest Design Discussions

Post  JPvelo Fri Nov 15, 2013 6:47 am

@Kim wrote:I DO believe that we're gonna have an interesting field of competitors !!!!

This and Ron's Flight Contest ought to make for some exciting articles in Bernie's next "Cox Engines Quaterly" !!!
As of right now I'm planning on running my contest engine on my speed plane.

Jim
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Mad Re: CEF speed contest Design Discussions

Post  duke.johnson Fri Nov 15, 2013 9:00 am

So how scale does it have to look? I found a plane I really like, but the fuse is different. It still looks like the plane though, sort of. They made it I'd say more modern looking for todays modeling. I think it looks faster.lol! 
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Mad Re: CEF speed contest Design Discussions

Post  JPvelo Fri Nov 15, 2013 9:14 am

@duke.johnson wrote:So how scale does it have to look?  I found a plane I really like, but the fuse is different.  It still looks like the plane though, sort of.  They made it I'd say more modern looking for todays modeling.  I think it looks faster.lol! 
It needs to look enough like the subject to be recognizeable. If you build a P-40 you should be able to put next to a photo of a P-40 and say "oh yeah, that's a P-40" without having to tilt your head and close one eye. I would like scale outlines to be as close to accurate as possible with minimal tweaking to fit the contest parameters. Does that answer you question?

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Mad Re: CEF speed contest Design Discussions

Post  roddie Fri Nov 15, 2013 9:33 am

@Kim wrote:Looks Great !!!!
Thanks Kim! The F8F-2 has been interesting so far... My model's dimensions/proportions have been calculated by eye... it's more of a challenge to me than scaling a drawing. I "did" end up lengthening my wingspan to 17" from 14.

The 3/4" x 7" x 1/8" dark-wood strip (walnut) centered on the l/e, is the mount for the 2 gear struts (1/16" m/w) which will be raked forward and will have .010" sheet alum. gear-doors fitted.

These are some wheels I made on a CNC router years ago. Not sure what size I'm going to use yet. Probably the smaller ones, which will be about 1-1/8" dia. once o-ring tires are fitted.

CEF speed contest Design Discussions - Page 2 11-15-11
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Mad Re: CEF speed contest Design Discussions

Post  duke.johnson Fri Nov 15, 2013 10:39 am

This is what I was thinking of. I think this is a real plane.

CEF speed contest Design Discussions - Page 2 Gee_be10
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Mad Re: CEF speed contest Design Discussions

Post  JPvelo Fri Nov 15, 2013 10:57 am

@duke.johnson wrote:This is what I was thinking of.  I think this is a real plane.

CEF speed contest Design Discussions - Page 2 Gee_be10
If that's a real plane go for it! It looks like a modified Nemesis:
CEF speed contest Design Discussions - Page 2 WU7K6RB
I was going to build one but I can't find a way to make it hit the rules without looking way out of proportion or ending up with a twenty inch fuselage and a twenty five inch span.

Jim
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Mad Re: CEF speed contest Design Discussions

Post  JPvelo Fri Nov 15, 2013 11:05 am

Any biplane takers? Minimum span is only 12.5 inches. I have one in mind for a second build.

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Mad Re: CEF speed contest Design Discussions

Post  pkrankow Fri Nov 15, 2013 11:58 am

Not sure about the biplane game. I think they look cool but I have never gotten a biplane to fly right.

I just moved my motor mount 1/2 inch back, and loped 3/8 inch off the nose. It still balances in front of the wing. No paint, no controls yet.

I ended up cutting out a section of 1/16 balsa and putting in 1/16 birch ply so I have a place to put my bellcrank. Now to find some safety pins for tip guides and I am ready to start painting...except for teh weather.

Phil
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Mad Re: CEF speed contest Design Discussions

Post  pkrankow Fri Nov 15, 2013 12:17 pm

That is a Gee Bee R-3 which, as far as I know, exists as a model only and has been built as an RC model for a number of years. I did not locate a full size prototype through google, just a couple of forums stating "someone" was building a full size version.

http://www.homebuiltairplanes.com/forums/hangar-flying/5567-gee-bee.html

I am OK with planes from fiction (such as the above), as long as they are similar to existing planes.

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Mad Re: CEF speed contest Design Discussions

Post  JPvelo Fri Nov 15, 2013 2:03 pm

I am going to disallow a "model of a model". The first line of the rules is "models will be of an actual aircraft type".

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Mad Re: CEF speed contest Design Discussions

Post  duke.johnson Fri Nov 15, 2013 2:04 pm

I can't find a real one either. Just talk of some thinking or trying to home build one. That sucks!Very Happy 
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Mad Re: CEF speed contest Design Discussions

Post  JPvelo Fri Nov 15, 2013 4:54 pm

@duke.johnson wrote:This is what I was thinking of.  I think this is a real plane.

CEF speed contest Design Discussions - Page 2 Gee_be10
Duke, I think a Heston Type 5 with the right paint would be damn close:
CEF speed contest Design Discussions - Page 2 NTYb5Wo
CEF speed contest Design Discussions - Page 2 23Ih1l7
CEF speed contest Design Discussions - Page 2 NtkznGC
32 foot span, 24 foot length. Scale that down to a 15 inch wing and the length comes out to 11.28 inches. Stretch the fuselage 3/4 inch in front of the wing to make room for the motor and there's your airplane.

Jim
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Mad Re: CEF speed contest Design Discussions

Post  duke.johnson Fri Nov 15, 2013 5:49 pm

Thanks. That is close. I don't know, that R-3 concept is just cool looking. I'll keep shopping around and keep the Type 5 in the back of my mind.
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Mad Re: CEF speed contest Design Discussions

Post  Cribbs74 Fri Nov 15, 2013 8:15 pm

@duke.johnson wrote:This is what I was thinking of.  I think this is a real plane.

CEF speed contest Design Discussions - Page 2 Gee_be10
If you don't build it then I sure will. That thing looks beyond cool!

Ron
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Mad Re: CEF speed contest Design Discussions

Post  batjac Sat Nov 16, 2013 3:35 am

I've got mine picked out. I just have to figure out how to make the graphics for the sides. I was gonna pass on this contest, as I been kinda poorly the last few weeks, but a challenge is a challenge. I spent about an hour last night thinking about how I'd do it. Soon's I finish the project I'm working on now, I'll draw it out and start cutting wood. I think I'm gonna try something a little different with the engine this time. If it works, I'll post build pics of the plane. If it don't work, well, forget I ever made this post.

The Under Wraps Mark
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Mad Re: CEF speed contest Design Discussions

Post  JPvelo Sat Nov 16, 2013 10:48 am

Here's my first cut:
CEF speed contest Design Discussions - Page 2 J1QanN5
I think it was Roddie that said this already but man these things are small. I think we'll see some good speeds with this!

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Mad Re: CEF speed contest Design Discussions

Post  JPvelo Sat Nov 16, 2013 10:50 am

@Cribbs74 wrote:
@duke.johnson wrote:This is what I was thinking of.  I think this is a real plane.

CEF speed contest Design Discussions - Page 2 Gee_be10
If you don't build it then I sure will. That thing looks beyond cool!

Ron
Ron,
Unfortunately that plane only exist as an RC model so it's not eligible.

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Mad Re: CEF speed contest Design Discussions

Post  duke.johnson Sat Nov 16, 2013 11:02 am

Ron- if it were allowed I would have built it. I might still build it for fun. I have the drawing ready.
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