Re: CEF speed contest Design Discussions (2014)

**RknRusty** Fri Jan 23, 2015 9:00 pm

Jim do you use a spinner on the nose of your plane?

JPvelo Fri Jan 23, 2015 9:47 pm

RknRusty wrote:Jim do you use a spinner on the nose of your plane?

Not on this one. The staggerwing had a spinner that faired into the cowling and really cleaned things up aerodynamically. I plan on replicating that front end on a corsair this year.

Jim

pkrankow Sat Jan 24, 2015 10:12 am

Wow, that sounds crazy rich before launch and leans out considerably in the first two laps.
Phil

JPvelo Fri Jan 30, 2015 5:09 pm

Had the day off work and it's rainy out do I got a start on my 2015 reedie entry.
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speed - CEF speed contest Design Discussions (2014) - Page 12 HBR838x

roddie Fri Jan 30, 2015 7:02 pm

Jim, is that the same gullwing construction as your 1st? Looks a beam-mount is planned!! Thumbs Up

NICE!!!

Marleysky Fri Jan 30, 2015 9:16 pm

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.

getback Fri Jan 30, 2015 9:28 pm

Locked ??? https://www.coxengineforum.com/t7743-cef-profile-scale-speed-2015?highlight=reed+speed+215

**RknRusty** Fri Jan 30, 2015 10:08 pm

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.

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.
Hope that helps.
Rusty

JPvelo Fri Jan 30, 2015 10:31 pm

RknRusty wrote:
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.
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.
Hope that helps.
Rusty

Exactly. Thanks Rusty.

JPvelo Fri Jan 30, 2015 10:35 pm

roddie wrote:Jim, is that the same gullwing construction as your 1st? Looks a beam-mount is planned!! NICE!!!

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.

Jim

JPvelo Wed Feb 18, 2015 4:54 pm

Found a little time to work on Super Corsair 2.0 today:
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**RknRusty** Wed Feb 18, 2015 10:10 pm

Oh great, I love to watch your work. Carry on. I'll be standing by for build updates.
Rusty

ian1954 Thu Feb 19, 2015 4:10 am

Has no one else started building yet?

getback Thu Feb 19, 2015 8:46 am

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 ?

OVERLORD Thu Feb 19, 2015 2:08 pm

ian1954 wrote:Has no one else started building yet?

All right, all right, I have

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rsv1cox Thu Feb 19, 2015 2:24 pm

ian1954 wrote:Has no one else started building yet?

Laid this out this morning. Thinking about hanging my Super tigre 60 on it, or maybe even a Cox Black Widow. Smile

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Oldenginerod Thu Feb 19, 2015 3:15 pm

OVERLORD wrote:
ian1954 wrote:Has no one else started building yet?

All right, all right, I have

I'm not too sure that Cox produced a pulse jet.

Mind you, the final result (crash & burn) is very familiar to me. lol!

Looking at your picture, I can see Ian ducking for cover.

Rod.

Mike Mulligan Thu Feb 19, 2015 4:03 pm

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

speed - CEF speed contest Design Discussions (2014) - Page 12 101_0311

speed - CEF speed contest Design Discussions (2014) - Page 12 101_0311

ian1954 Thu Feb 19, 2015 6:50 pm

Oldenginerod wrote:
OVERLORD wrote:
ian1954 wrote:Has no one else started building yet?

All right, all right, I have

I'm not too sure that Cox produced a pulse jet.

Mind you, the final result (crash & burn) is very familiar to me.

Looking at your picture, I can see Ian ducking for cover.

Rod.

https://www.youtube.com/watch?v=TX_zI4tIueY

getback Fri Feb 20, 2015 8:21 am

OK I think I have decided on this one TD or Reed ? speed - CEF speed contest Design Discussions (2014) - Page 12 P51_dr10

Of coarse it comes with a movie Very Happy

Maybe I can get it drawn up today Flying

Eric

JPvelo Mon Feb 23, 2015 6:29 pm

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.
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Jim

pkrankow Mon Feb 23, 2015 6:48 pm

Dumb question: How do you change out the bladder when it breaks?

Phil

JPvelo Mon Feb 23, 2015 7:02 pm

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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**RknRusty** Mon Feb 23, 2015 7:15 pm

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?

JPvelo Mon Feb 23, 2015 7:51 pm

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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