REFLECTOR: Re; NACA outlet

[John Dibble]

I had air leaking around my flapper also.  I used silicone sealant to make a tight
seal.  I put clear tape on the flapper so it wouldn't get stuck to the sealant.  Works
great.

John

Jerry Teitsma wrote:

> I have two oil coolers feeding into a collector box in the nose of my 173 FG
> (Franklin engine).  There is a flapper inside the collector box that diverts
> the heated air either out the outlet under the fuselage or into the cabin.
> Pressure builds up in the collector box and heated air leaks around the
> flapper, heating the cabin even when I don't want heat.  It would be great
> to be able to have negative pressure in the collector box but apparently,
> the two NACA scoops  feeding air in are much more efficient than the one
> exit supplied with the kit.  I've cut back the exit slightly to provide a
> bigger outlet and that helped some but I still have too much heat into the
> cabin.  Great heater though...  Any ideas?
>
> Jerry Teitsma
> Granby CO
> jerryteits at comcast.net
>
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