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CEF speed contest Design Discussions (2014)
Page 12 of 20
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Re: CEF speed contest Design Discussions (2014)
JPvelo wrote:JPvelo wrote:Stay tuned.... Seems like the most important thing is aerodynamics.
Jim
I have read the rules for 2015. Given up on the spruce goose with 5 .010's. Read the rules again, and found no reference to construction materials. Are other materials legal to use? Or is it assumed all profile racers are balsa? I'm asking here because the 2015 rules thread is locked. Thanks.
Marleysky- Top Poster
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Re: CEF speed contest Design Discussions (2014)
You can build it out of anything. It's just stand-off scale, in other words it should look about like the full size plane from casual observation. Colors and markings are not required to be authentic at all. I thought craft foam board would be good and light before I built my Mustang, but it turns out it weighs about the same as balsa on my electronic food scale.Marleysky wrote:JPvelo wrote:JPvelo wrote:Stay tuned.... Seems like the most important thing is aerodynamics.
Jim
I have read the rules for 2015. Given up on the spruce goose with 5 .010's. Read the rules again, and found no reference to construction materials. Are other materials legal to use? Or is it assumed all profile racers are balsa? I'm asking here because the 2015 rules thread is locked. Thanks.
Hope that helps.
Rusty
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Re: CEF speed contest Design Discussions (2014)
Exactly. Thanks Rusty.RknRusty wrote:You can build it out of anything. It's just stand-off scale, in other words it should look about like the full size plane from casual observation. Colors and markings are not required to be authentic at all. I thought craft foam board would be good and light before I built my Mustang, but it turns out it weighs about the same as balsa on my electronic food scale.Marleysky wrote:JPvelo wrote:JPvelo wrote:Stay tuned.... Seems like the most important thing is aerodynamics.
Jim
I have read the rules for 2015. Given up on the spruce goose with 5 .010's. Read the rules again, and found no reference to construction materials. Are other materials legal to use? Or is it assumed all profile racers are balsa? I'm asking here because the 2015 rules thread is locked. Thanks.
Hope that helps.
Rusty
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Re: CEF speed contest Design Discussions (2014)
Yes, same construction. It's for a horseshoe backplate. It's going to have the same intake as the staggerwing and I'm going to try and bury the bladder in the nacelle behind the engine.roddie wrote:Jim, is that the same gullwing construction as your 1st? Looks a beam-mount is planned!! NICE!!!
Jim
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Re: CEF speed contest Design Discussions (2014)
Found a little time to work on Super Corsair 2.0 today:
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Re: CEF speed contest Design Discussions (2014)
Oh great, I love to watch your work. Carry on. I'll be standing by for build updates.
Rusty
Rusty
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Re: CEF speed contest Design Discussions (2014)
Has no one else started building yet?
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Re: CEF speed contest Design Discussions (2014)
Wow Jim that's got a lot of dihedral in the wing ,Looking good as always ! I have not started yet need to look at some more designs/have not decided on what to build ?
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Re: CEF speed contest Design Discussions (2014)
This one is coming along pretty well for this go round. It is the Red Baron Mustang and it was started for the last contest. I've got it off the shelf and progress is being made to have it flying for this go round.
I've sketched up another plane for the Tee Dee class too. Pics of that as progress warrants...
Mike
I've sketched up another plane for the Tee Dee class too. Pics of that as progress warrants...
Mike
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Re: CEF speed contest Design Discussions (2014)
Is that a bladder in your nacelle or are you just glad to see me....
It's hard to see but there's a fully inflated bladder in there. Next challenge, how to best hide the bellcrank aerodynamically while still leaving it exposed per the rules.
Jim
It's hard to see but there's a fully inflated bladder in there. Next challenge, how to best hide the bellcrank aerodynamically while still leaving it exposed per the rules.
Jim
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Re: CEF speed contest Design Discussions (2014)
Dumb question: How do you change out the bladder when it breaks?
Phil
Phil
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Re: CEF speed contest Design Discussions (2014)
pkrankow wrote:Dumb question: How do you change out the bladder when it breaks?
Phil
The check valve comes off so the Tee fitting can be weaseled out the front.
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Re: CEF speed contest Design Discussions (2014)
And they rarely ever burst. Those little Fourmost 1-way valves really make fueling easy don't they. Good design.
Rusty
P.S. When is the qualifying photo due?
Rusty
P.S. When is the qualifying photo due?
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Re: CEF speed contest Design Discussions (2014)
RknRusty wrote:And they rarely ever burst. Those little Fourmost 1-way valves really make fueling easy don't they. Good design.
Rusty
P.S. When is the qualifying photo due?
Thanks Rusty, photos are due December 14th. Videos must be in by December 31st
Jim
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Re: CEF speed contest Design Discussions (2014)
The front end is all mocked up. I didn't realize the fuel line would lay so flat. If I were to do it again or if anyone wants to copy it I would hide the needle and fill valve behind the cylinder. I decided to put the bellcrank as flat against the wing as possible.
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Re: CEF speed contest Design Discussions (2014)
It looks great. I find it easier to operate the needle on the inboard side, but the fill valve would be hidden better aerodynamically behind the cylinder.JPvelo wrote:The front end is all mocked up. I didn't realize the fuel line would lay so flat. If I were to do it again or if anyone wants to copy it I would hide the needle and fill valve behind the cylinder. I decided to put the bellcrank as flat against the wing as possible.
Rusty
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
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Re: CEF speed contest Design Discussions (2014)
I like that ram-air set-up. I liked it on the Beech too.. It looks great, as well as being functional. How will you manage the lead-outs with that bellcrank position? I was thinking possibly a 2nd set of guides just before where the wing cants up to the fuse. It would have to be strong though.. so as not to pull out of the wing. Maybe I'm seeing it all wrong? It seems that's the only way you'd achieve perpendicularity to your bellcrank bearing.
Re: CEF speed contest Design Discussions (2014)
Maybe that's why he's got 3 holes on one side of the bellcrank. But I don't think the angle is as critical as one might think, as long as the line length can be adjusted at the handle.roddie wrote:... It seems that's the only way you'd achieve perpendicularity to your bellcrank bearing.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
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Re: CEF speed contest Design Discussions (2014)
RknRusty wrote:Maybe that's why he's got 3 holes on one side of the bellcrank. But I don't think the angle is as critical as one might think, as long as the line length can be adjusted at the handle.roddie wrote:... It seems that's the only way you'd achieve perpendicularity to your bellcrank bearing.
There's a very good reason my bellcrank has three holes on the up side... That's how I found it in the used bin at Franks Hobby House!!!
If this was a stunter like Rustys' speed plane I would be more concerned with the angle. The elevator moves so little on one of these flights I don't think it will matter much. Famous last words....
Jim
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