REFLECTOR: Diffuser-to-NACA Boot?

[Sid Knox via Reflector]

Hi Tom,
The previous owner/builder of my Velocity (same engine as yours) converted 
from armpit scoops to the overhead NACAs and he used what appears to be a 
strip of inner-tube rubber to make the boot.  There is about a one-half inch 
gap between the scoop and the fiberglass diffuser.  The scoop end is 
fastened with pop-rivets and the engine end is fastened with a large nylon 
tie-wrap.  the overlap of the rubber is bonded with what appears to be 
rubber cement.  I have owned the plane since 2001 and have never had any 
problems with that mod.  Next time I have the top cowling off, I could take 
some photos but you will probably have already done something by then...

Sid Knox
Oklahoma

Velocity  173 RG  N199RS
KR2         N24TC
W7QJQ



> I’m close to finishing my conversion to a NACA roof scoop setup and have a
> question for the group.
> The subject aircraft is a Velocity STD/RG with an IO-36

> I thought that I could fabricate a junction boot out of rubber or some
> fiberglass tape impregnated with RTV.

> Any suggestions?

> Tom Mann



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