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Cowl vs prop size

Cox Engines Forum  :: Models and Modeling

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can`t hurt to try

Post  Jaspur_x on Wed Dec 28, 2011 4:25 am

I am just going by my limited experience here guys, 1 model with a cowl in all my years isn`t a lot of experience, my cowl is about 3/4" behind the prop, and only blocks about 1/3rd the prop.

The ww2 paratropers called it prop blast, so thats what I went with. Huh...
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Re: Cowl vs prop size

Post  Cribbs74 on Wed Dec 28, 2011 8:20 am

Ok,

I will try a .020 because it can't hurt but, I will pick up some Texaco pieces just in case.

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Re: Cowl vs prop size

Post  SuperDave on Wed Dec 28, 2011 8:30 am

JPvelo wrote:I say try it with the .020. Prop blast only happens when the model is standing still. Once in flight the "blast" matches forward velocity. The prop isn't pushing air backwards like a fan, it is pulling the aircraft forward due to it's airfoil cross section that creates "lift" in front of the aircraft.

Excellent post, JP! Welcome to the forum.
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Re: Cowl vs prop size

Post  microflitedude on Wed Dec 28, 2011 12:21 pm

SuperDave wrote:
JPvelo wrote:I say try it with the .020. Prop blast only happens when the model is standing still. Once in flight the "blast" matches forward velocity. The prop isn't pushing air backwards like a fan, it is pulling the aircraft forward due to it's airfoil cross section that creates "lift" in front of the aircraft.

Excellent post, JP! Welcome to the forum.

+1.

Very informative.
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Re: Cowl vs prop size

Post  049flyer on Tue Jun 06, 2017 8:11 pm

Baby Bee .049 puts out about the same power as your Tee Dee .020. Try the Baby Bee, it will swing a 6 inch prop easily and even a 7 inch.
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Re: Cowl vs prop size

Post  RknRusty on Tue Jun 06, 2017 9:59 pm

Hi, 049flyer,
Welcome to CEF.... or welcome to posting, anyway. I see you joined a few years ago.
You've found a really old thread here, but Cribbs, the OP is online right now. I'm curious to see if you just gave him he answer he was looking for... 6 years later. Very Happy On Christmas day too.

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Re: Cowl vs prop size

Post  Cribbs74 on Wed Jun 07, 2017 10:47 pm

Not so much, that project had been placed in storage after I picked up the handle. Knowing what I know now I would more than likely choose a different engine altogether.

I do appreciate the reply though and welcome to CEF!
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Re: Cowl vs prop size

Post  roddie on Thu Jun 08, 2017 2:35 pm

Cribbs74 wrote:Not so much, that project had been placed in storage after I picked up the handle. Knowing what I know now I would more than likely choose a different engine altogether.

I do appreciate the reply though and welcome to CEF!

It's cool when old threads like this one resurface. I remember having similar concerns with running a cowl on my 1st CEF Reed-Speed model. Coincidentally Ron... Laughing your model for that contest was............
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