REFLECTOR: Putting additional outlets on the Down Draft Runners

[Scott Derrick]

Thanks Scott,

Are you getting intake air for the servo from NACA's also?

Scott

Scott Baker wrote:

> Hello Scott -
> Scott Swing is helping a Velocity builder install a TSIO-550 in a 
> Velocity XL (details and updates appear from time to time on the 
> Velocity web site) - this engine features twin inter-coolers.  They 
> are planning to cool the entire engine (inter-coolers and cylinders) 
> using air from the roof-top NACAs.  The factory does not have any 
> scientific values relating to how much air and pressure is introduced 
> through the NACAs.  Based on field experience, we see that it is "just 
> enough" for Lycomings and "plenty" for Continentals.  VG's are often 
> added to encourage the air to enter the NACA's.  The turbo charged 
> installation is new to us - we do not know if the NACAs will provide 
> adequate cooling at altitude.
> Scott B.
>
>
> ----- Original Message ----- From: "Scott Derrick" <scott at tnstaafl.net>
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Sent: Friday, April 22, 2005 10:00 PM
> Subject: REFLECTOR: Putting additional outlets on the Down Draft Runners
>
>
>> Many have posted about taking additional air from the downdraft 
>> runners to supply oil coolers, water coolers,  intake air, etc...
>>
>> I will need air for an intercooler and intake air.  I was thinking of 
>> using the ram air port I already have and possibly one of the arm pit 
>> scoops.  But if there is plenty coming through the down draft NACA's 
>> I'd love to eliminate the arm pits...
>>
>> How much can we steal from the runners before we start effecting the 
>> CHT's?
>>
>> Does the factory have a recommendation on this?
>>
>> Scott
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