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Cox Engine of The Month
CEF Traveling Engine
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CEF speed contest Design Discussions
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Roddie's F8F-2 "Rare-Bear"
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.
I hope to "further" trim the c/g with different push-rod materials.
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Re: CEF speed contest Design Discussions
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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...and never Ever think about how good you are at something...
while you're doing it!
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Re: CEF speed contest Design Discussions
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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Roddie's F8F-2 "Rare-Bear"
roddie Thu Nov 14, 2013 9:09 pm
The only thing I find more tedious than slotting hinges, is joining a split-elevator...
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Re: CEF speed contest Design Discussions
JPvelo Fri Nov 15, 2013 6:23 am
I spent time blowing up drawings yesterday, should be cutting wood Monday.
Jim
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Re: CEF speed contest Design Discussions
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" !!!
This and Ron's Flight Contest ought to make for some exciting articles in Bernie's next "Cox Engines Quaterly" !!!
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Re: CEF speed contest Design Discussions
JPvelo Fri Nov 15, 2013 6:47 am
As of right now I'm planning on running my contest engine on my speed plane.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" !!!
Jim
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Re: CEF speed contest Design Discussions
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.
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Re: CEF speed contest Design Discussions
JPvelo Fri Nov 15, 2013 9:14 am
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?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.
Jim
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Re: CEF speed contest Design Discussions
roddie Fri Nov 15, 2013 9:33 am
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.Kim wrote:Looks Great !!!!
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.
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Re: CEF speed contest Design Discussions
duke.johnson Fri Nov 15, 2013 10:39 am
This is what I was thinking of. I think this is a real plane.
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Re: CEF speed contest Design Discussions
JPvelo Fri Nov 15, 2013 10:57 am
If that's a real plane go for it! It looks like a modified Nemesis:duke.johnson wrote:This is what I was thinking of. I think this is a real plane.
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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Re: CEF speed contest Design Discussions
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.
Jim
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Re: CEF speed contest Design Discussions
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
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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Re: CEF speed contest Design Discussions
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.
Phil
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.
Phil
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Re: CEF speed contest Design Discussions
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".
Jim
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Re: CEF speed contest Design Discussions
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!
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Re: CEF speed contest Design Discussions
JPvelo Fri Nov 15, 2013 4:54 pm
Duke, I think a Heston Type 5 with the right paint would be damn close:duke.johnson wrote:This is what I was thinking of. I think this is a real plane.
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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Re: CEF speed contest Design Discussions
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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Re: CEF speed contest Design Discussions
Cribbs74 Fri Nov 15, 2013 8:15 pm
If you don't build it then I sure will. That thing looks beyond cool!duke.johnson wrote:This is what I was thinking of. I think this is a real plane.
Ron
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Re: CEF speed contest Design Discussions
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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Re: CEF speed contest Design Discussions
JPvelo Sat Nov 16, 2013 10:48 am
Here's my first cut:
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!
Jim
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!
Jim
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Re: CEF speed contest Design Discussions
JPvelo Sat Nov 16, 2013 10:50 am
Ron,Cribbs74 wrote:If you don't build it then I sure will. That thing looks beyond cool!duke.johnson wrote:This is what I was thinking of. I think this is a real plane.
Ron
Unfortunately that plane only exist as an RC model so it's not eligible.
Jim
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Re: CEF speed contest Design Discussions
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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