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From: David Jones
To: Charlie Kohler

Charlie, your comment mystifies me.  I am talking about the Heat Control Valve
Assembly, not the Sonic Nozzles.  I am not replacing Sonic Nozzles.

But, as long as you have brought the point up, what is the function of the
Waste Gate Controller, if not to bleed and balance excessive unusable
compressed air?   To expect  the Sonic Nozzles dumping compressed air
overboard to fix "engine surge" is not my idea of  the way the engine should
run.

 I would be looking at having the Waste Gate Controller on such an engine sent
in for overhaul, because it would seem to have stopped doing the job for which
it was designed.

Additionally, there are Sonic Nozzles, and there are Sonic Nozzles.  Mine have
about a 1/4" hole at the throat of a sloping venturi.  At the fly-in this
fall, Lancair had an engine being built up on a stand with ONE INCH nozzles
welded to each Turbo Intercooler.  They weren't even nozzles as such, but were
simply 1" straight-wall tubes.  I can't imagine a pair of turbos compressing
air and having two one-inch pipes dumping the air overboard, while the poor
Waste Gate Controller was trying to perform to its specifications!

But, what the hell do I know?  Maybe it was for some special use, like maybe a
balloon inflation capability at Albuqurque!

I do know one thing, however.  When my Lancair-supplied flapper valve was
leaking compressed air  (much less even than freely porting it overboard),  I
was losing 10 kts of airspeed.  I didn't spend five years building this
airplane to freely give up 10 kts!

David Jones