REFLECTOR: Molding a P-51 Scoop

[Jim Sower]

A friend of mine has a Cozy with a 13BT.  All his cooling comes through 
the standard plans NACA belly scoop.  Don't recall the dimensions, but 
it's about the size of your proposed intercooler opening.  Now rotarys 
have serious heat rejection issues, and this opening feeds his radiator, 
oil coolers AND intercooler.  He's been up to close to 50" MAP which is 
well over 250 hp and never had a cooling issue.  The conventional wisdom 
on the rotary and Soob lists is that intercooler cooling requirements 
are quite modest compared to the engine.

My .02 ... Jim S.

Scott Derrick wrote:

> 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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