REFLECTOR: Molding a P-51 Scoop

Scott Derrick scott at tnstaafl.net
Tue Sep 6 11:29:27 CDT 2005


Alex,

I checked and you are correct,  3-1 or 4-1 are recommended.  I don't 
know where I got a 2-1 ratio?

4-1 would be a much better and smaller scoop. 

Back to the drawing board.

Scott

Alex Balic wrote:

>My intercooler opening is about 1/4 the size of the intercooler face-
>when you check the book- see  if it has design pressure at the airspeed
>in our range- most automotive books do not.
>
>-----Original Message-----
>From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
>Behalf Of Scott Derrick
>Sent: Monday, September 05, 2005 8:34 PM
>To: Velocity Aircraft Owners and Builders list
>Subject: Re: REFLECTOR: Molding a P-51 Scoop
>
>Jim,
>
>The intercooler face is 6x22, I thought I read some formula that a 
>1-to-2 expansion area in front of the intercooler was a good thing.
>
>I will reread my turbo book and verify what I need.  I agree, it seems 
>like a whole lot of area. I would think 1/4 of that would do.
>
>Scott
>
>Jim Sower wrote:
>
>  
>
>>Isn't 66 sqin nearly the size of the engine cooling inlet?  Sounds 
>>like a lot.  I would have thought maybe 30% of that would do.  Anyway,
>>    
>>
>
>  
>
>>Urethane foam is cheap and carves easiest, Styrofoam will melt away 
>>with gas.  I use duct tape or plastic/shrink wrap as a release agent.
>>I'd revisit my sizing formula ... Jim S.
>>
>>Scott Derrick wrote:
>>
>>    
>>
>>>I need to make a P-51 style scoop for my intercooler.
>>>
>>>It needs to have a 3 inch x 22 inch opening.
>>>
>>>Roughly rectangular, this would be mounted on the belly right at the 
>>>firewall.
>>>
>>>What would be the best way to go about this?   Carve one out of foam?
>>>
>>>Any ideas are appreciated.
>>>
>>>Scott
>>>
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