REFLECTOR: Molding a P-51 Scoop

[Scott Derrick]

All you are correct, 4:1 is what is recommended.

I'm thinking more on the lines of 2x17 , with half the intercooler 
tucked up above the scoop line.

back to fitting my proto-typing foam blocks and hose....

Scott

Al Gietzen wrote:

> 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
>
> The flow rate depends on the amount of heat to reject and the 
> temperatures involved – of which I have no knowledge -; but For the 
> speeds our planes go a diffuser area ratio of about 4:1 (or higher) 
> gives good pressure recovery for a ‘typical’ heat exchange. So you 
> might want to be thinking along the lines of about 4” x 8” entrance, 
> expanding in a sort of bell shape to the face of the H.E..
>
> It is a common misconception that a ram scoop necessarily causes more 
> drag than a submerged inlet (NACA), but that is not necessarily the 
> case. It’s a matter of the energy of the air going in, and the air 
> going out. With somewhat optimal ducting (which usually is difficult 
> to achieve), the better efficiency of a ram scoop gives you more 
> energy to work with in accelerating the air again before release, and 
> the potential for low drag. The P-51 scoop and exit ducting is an 
> excellent example of a very low cooling drag.
>
> I’m not an aeronautical engineer, but I did stay at a Holiday Inn 
> Express J
>
> Al
>
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