REFLECTOR: Molding a P-51 Scoop

[Alex Balic]

Scott-
How are you getting the oil from your turbo back to the pan? 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Derrick
Sent: Tuesday, September 06, 2005 1:31 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Molding a P-51 Scoop

I'm really paranoid about having enough cooling.  I have a separate 
under wing ram air scoop for induction air, top NACA's for cylinder, 
alternator, and possibly turbo bearing cooling, and I was going to use 
the P51 scoop for intercooler cooling. 

The turbo hangs down below the belly line so I'm either going to have a 
bulge or I can install a scoop/plenum at the firewall for the 
intercooler and that will also contain the turbo for a clean cowl line.

I think I might as well do the scoop.  If I have to much cylinder 
cooling from the NACA's I can always put some kind of door in them and 
restrict the flow during winter and cruise.

Scott


Alex Balic wrote:

>Hi Scott-
>Actually, for my intercooler, I take the air from one of the top NACA
>scoops- if you can send me your e-mail directly, I will send you a
>picture of the rather strange duct I had to make for this- the
>intercooler face is about 8X10 and sits close to the firewall, so it
had
>to do some really fast expanding, but it is probably about 5:1 I am
>guessing- not too concerned, because cooling the intake is not as
>important as cooling the glycol- will send along some belly scoop pics
>when I can get them out of the camera......
>
>Alex
>
>-----Original Message-----
>From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
>Behalf Of Scott Derrick
>Sent: Tuesday, September 06, 2005 11:29 AM
>To: Velocity Aircraft Owners and Builders list
>Subject: Re: REFLECTOR: Molding a P-51 Scoop
>
>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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>>
>>    
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>>>>     
>>>>
>>>>        
>>>>
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