William wrote:

I agree that the issue is old, with one exception.

The fact that the tape got hot at idle/taxi speeds, but that the VAM drew
well at flying, higher power settings is significant. I would interpret this
to the need for significant gas momemtum in the exhaust stream to be
required in order to create the suction on the inner tube.  At low rpm, the
momentum doesn't doesn't overcome the pressure drop in the outlet tube, and
some exhaust comes forward, giving the 'exhaust smell, and hot tape'
observation. At high power/rpm, the momentum of the exhaust creates a
negative pressure sufficient to cause a '45 mph' flow on the pitot tube.

We should use this information in any further changes to the design, to make
it work even better.
Bill Schertz
KIS Cruiser # 4045

I totally agree but we must address the idle problem. Best way to do that
is have the VAM intake totally open to the forward cowl surface either mounted
on a Coot pylon or a metal pipe connecting the VAM intake to a metal opening 
at the front surface of the cowl. Probably difficult to achieve with cheek

mounted radiators.

Paul

 
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