Jerry Hey wrote:

Paul,  the engine I bought was modified to eliminate the thermostat
and housing following Tracy's example.

  I would appreciate hearing from  anyone who is flying without a
thermostat, or hearing opinions on the pros and cons.   Which is
preferable, thermostat or adjustable doors on the exhaust side?

There is a low profile thermostat housing on your site.  Is this
something one can buy?
Jerry

I did that to cut the height down to fit under a low cowling.
I removed the thermostat in the process and welded shut the 
bypass passage. Very Very important if you remove the thermostat.

The rotary uses an unusually thermostat that bypasses the water flow back
into the block when the thermostat is closed.

The picture shows the pump before it was welded up. Believe it or not 
the bigger lower passages is the by pass passage. This must be welded closed.
The upper passage is the return passage from the block showing a restriction.

For many airplanes it is not necessary to cut down the pump as they fit
under the cowling without cutting them down. You must still block the
bypass passage if you remove the thermostate.

For a high speed airplane it is very important to use a cowl flap
instead of a thermostat to cut cooling drag at high speeds
when the dynamic pressure is high and less cooling capacity is needed.
Well actually.. the same cooling capacity but you have much higher pressure air
to work with. Four times higher pressure.

Paul Lamar
 
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