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MauricioB's

"Cox Tee Dee .010"



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CEF speed contest Design Discussions

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Re: CEF speed contest Design Discussions

Post  Theo Kleynhans on 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
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Re: CEF speed contest Design Discussions

Post  JPvelo on 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
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Re: CEF speed contest Design Discussions

Post  Mike Mulligan on Thu Aug 21, 2014 1:14 pm

Thanks Jim.
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Re: CEF speed contest Design Discussions

Post  JPvelo on Thu Aug 21, 2014 3:51 pm

Here she is, 5.5oz of glory:




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
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Re: CEF speed contest Design Discussions

Post  Mike Mulligan on Thu Aug 21, 2014 5:23 pm

To quote Rusty, that's just stupefyingly cool!
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Re: CEF speed contest Design Discussions

Post  pkrankow on Thu Aug 21, 2014 5:29 pm

Boy that is pretty.

Phil
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Re: CEF speed contest Design Discussions

Post  roddie on Thu Aug 21, 2014 7:39 pm

very VERY nice Jim!!!
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Re: CEF speed contest Design Discussions

Post  getback on 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
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Re: CEF speed contest Design Discussions

Post  RknRusty on 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 .
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Re: CEF speed contest Design Discussions

Post  JPvelo on Fri Aug 22, 2014 10:52 am

Thanks guys,

We will find out if it flys next Friday.

Jim
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Re: CEF speed contest Design Discussions

Post  OVERLORD on 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?
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Re: CEF speed contest Design Discussions

Post  JPvelo on 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
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Re: CEF speed contest Design Discussions

Post  JPvelo on 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:



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
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Re: CEF speed contest Design Discussions

Post  pkrankow on 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
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Re: CEF speed contest Design Discussions

Post  RknRusty on 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.


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Re: CEF speed contest Design Discussions

Post  roddie on 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?
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Re: CEF speed contest Design Discussions

Post  RknRusty on 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.

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Re: CEF speed contest Design Discussions

Post  Cribbs74 on Sun Aug 24, 2014 10:20 pm

Yeah, that was pretty quick.. Shocked 
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Re: CEF speed contest Design Discussions

Post  navion34 on 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...
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Re: CEF speed contest Design Discussions

Post  Theo Kleynhans on 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
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Re: CEF speed contest Design Discussions

Post  ian1954 on 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


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Re: CEF speed contest Design Discussions

Post  Theo Kleynhans on Mon Aug 25, 2014 5:48 am

Thanks

Much appreciated
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Re: CEF speed contest Design Discussions

Post  getback on Mon Aug 25, 2014 2:04 pm

YES!!! that was speedy lol! ERic
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Re: CEF speed contest Design Discussions

Post  Mike Mulligan on 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
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Re: CEF speed contest Design Discussions

Post  RknRusty on Mon Aug 25, 2014 9:19 pm

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

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Re: CEF speed contest Design Discussions

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