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Cowl vs prop size - Page 2 Empty

Cowl vs prop size

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Cowl vs prop size - Page 2 Empty can`t hurt to try

Post  Jaspur_x 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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Post  Cribbs74 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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Post  SuperDave 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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Post  microflitedude 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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Post  049flyer 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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Post  RknRusty 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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Post  Cribbs74 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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Post  roddie 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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