Re: CEF speed contest Design Discussions (2014)

Theo Kleynhans Thu Aug 21, 2014 12:57 am

Hi Guys. Thank you for all the tips and suggestions.

I agree that putting the engine upside down will look the best, but then I need to build a whole cowl and nose for it and I am not that confident in building yet. I would not even know where to start.

I was thinking of mounting it normally and just adding a plastic cowl like some of the ones in the first round.

I will have to sit and think a bit before starting this phase.

Theo

JPvelo Thu Aug 21, 2014 2:17 am

Mike Mulligan wrote:Hi everybody,

I just re-read the post I put up regarding Jim's plans, rudders and such and I feel I need to apologize.

When I read it this morning, I felt it came across as somewhat snarky and sarcastic, and that was NOT AT ALL what I intended!

Jim, your planes are very clever, well designed and built. When I said I felt that you are a sharp guy and that I can't wait to see what you are up to, I meant it very sincerely, but the way it was written it could be perceived as being sarcastic. That is in NO WAY what I intended, and if it did come across that way to anyone, especially Jim, I sincerely apologize.

Mike

Mike,
No need for an apology, no offense taken. Thank you.

Jim

Mike Mulligan Thu Aug 21, 2014 1:14 pm

Thanks Jim.

JPvelo Thu Aug 21, 2014 3:51 pm

Here she is, 5.5oz of glory:
CEF speed contest Design Discussions (2014) - Page 6 NFCBaMv

CEF speed contest Design Discussions (2014) - Page 6 MOrUNhk

CEF speed contest Design Discussions (2014) - Page 6 Q27Q0oQ

Test ran the engine with the sealed intake, numbers are the same as when it was mounted on Miss Ashley. The 35% nitro is attacking the rustoleum in places. The cowl also split from trying to tuck the filter into it, I can glass it on the inside.

Jim

Mike Mulligan Thu Aug 21, 2014 5:23 pm

To quote Rusty, that's just stupefyingly cool!

pkrankow Thu Aug 21, 2014 5:29 pm

Boy that is pretty.

Phil

roddie Thu Aug 21, 2014 7:39 pm

very VERY nice Jim!!!

getback Thu Aug 21, 2014 10:27 pm

Nice Build There Jim if it goes as fast as it looks were in for another speedy adventure Babe Bee .049

Getback

**RknRusty** Thu Aug 21, 2014 10:49 pm

Mike Mulligan wrote:To quote Rusty, that's just stupefyingly cool!

Hahaha! When you just kind of sit there staring at it with glazed eyes and your mouth slightly ajar. JIm does that to me now and then. Roddie's Bearcat did too. We really have some artful builders, Theo is one of our newer ones too. He's really good and a fast learner. My planes look nice, but in a utilitarian sort of way. Maybe the dirty fingernail crowd lusts over mine Rolling Eyes

.
Rusty

JPvelo Fri Aug 22, 2014 10:52 am

Thanks guys,

We will find out if it flys next Friday.

Jim

OVERLORD Fri Aug 22, 2014 12:58 pm

That's a very nice built model Jim. What would be the advantage of fixing the belcranck to the upper wing? more stable flight?

Hey, where are the first 30 or so pages of this thread?

JPvelo Fri Aug 22, 2014 3:51 pm

OVERLORD wrote:That's a very nice built model Jim. What would be the advantage of fixing the belcranck to the upper wing? more stable flight?

Hey, where are the first 30 or so pages of this thread?

Thanks,
I have my theory about having the bellcrank above the vertical center of gravity increasing speed but mostly it was "ease of assembly". lol!

I noticed yesterday the topic had been split, the rest is on page two of "cox discussions".
https://www.coxengineforum.com/t5910-cef-speed-contest-design-discussions

JPvelo Fri Aug 22, 2014 4:02 pm

I started cutting out my second entry, to be powered by a Hot Rod Space Hopper. It's a Airtractor 802 gunship:
CEF speed contest Design Discussions (2014) - Page 6 HFf3CI3

CEF speed contest Design Discussions (2014) - Page 6 HFf3CI3

CEF speed contest Design Discussions (2014) - Page 6 NoXhrRM

With a 12" fuselage the wing scales out to 20"x2.25" for a dead on 45 squares. The long thin wing is theoretically more aerodynamic. I wonder at what point does frontal area of the model outweigh the advantage of a low aspect (long thin) wing?

Jim

pkrankow Fri Aug 22, 2014 4:32 pm

That reminds me I need to the motor on my duster down and see if I can get it to run this weekend since I expect my big brother here to help launch and stuff.

Phil

**RknRusty** Sun Aug 24, 2014 9:06 pm

One of our club guys, David Smith flew his speed plane at Triple Tree yesterday. It's a 21 proto speed. I e-mailed him to find out the line length and engine, so I'll post that when I find out. This mother was Loud! Listen to it slice the air on the close passes. 26 laps and he's leaning back against the pull.

roddie Sun Aug 24, 2014 9:57 pm

RknRusty wrote:One of our club guys, David Smith flew his speed plane at Triple Tree yesterday. It's a 21 proto speed. I e-mailed him to find out the line length and engine, so I'll post that when I find out. This mother was Loud! Listen to it slice the air on the close passes. 26 laps and he's leaning back against the pull.

NICE!!! I'll guess 52' lines. What a SCREAMER!! Nelson engine?

**RknRusty** Sun Aug 24, 2014 10:04 pm

roddie wrote:NICE!!! I'll guess 52' lines. What a SCREAMER!! Nelson engine?

That's my guess too. I'll let you know when he returns my e-mail.

**Cribbs74** Sun Aug 24, 2014 10:20 pm

Yeah, that was pretty quick.. Shocked

navion34 Mon Aug 25, 2014 4:17 am

This engine runs very well...

You can find NovaRossi, R&B, or Rex engines, good choice for speed models...

Theo Kleynhans Mon Aug 25, 2014 4:42 am

Hi Guys

Can someone please also paste the video link, I cannot watch the video as it is shown at the moment.

Theo

ian1954 Mon Aug 25, 2014 5:47 am

Theo Kleynhans wrote:Hi Guys

Can someone please also paste the video link, I cannot watch the video as it is shown at the moment.

Theo

https://www.youtube.com/watch?v=HmflRE9CUBQ

Theo Kleynhans Mon Aug 25, 2014 5:48 am

Thanks

Much appreciated

getback Mon Aug 25, 2014 2:04 pm

YES!!! that was speedy lol!

ERic

Mike Mulligan Mon Aug 25, 2014 4:30 pm

That's pretty inspiring! Hats off to anyone who has to lean into their Reedy like that! lol!

Mike

**RknRusty** Mon Aug 25, 2014 9:19 pm

The engine is a Rossi. No word on the line length.

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