Last time we flew the TTC we had no intake manifold  water
injection. Usually considered essential for turbo engines. Wiring
error on the water pump. I did not do it!

Intake manifold air temperature got up to 300 F. With 60 inches of Hg
manifold pressure and 8000 RPM  this would have blown a piston engine
sky high.

It still climbed out of sight in 27 seconds. Then it climbed 75 to 80
degrees near vertical  some where between 90 and 110 kts. That
translated to something  like 10,000 feet per minute.

I was worried about the engine. So I set up the Maximite to record
compression. I expected to see some cracked apex seals.

Nothing. The engine came through OK.

Here are the plots of the compression data. Each spike is one rotor
face compression.

And the take off video.

If we had wider blades on the prop we could jack the boost up to 80
inches of Hg. At 8000 RPM the tips are going super sonic.

I don't think we need it but it is an option if we don't quite get
the record.

We will fly it again tomorrow after noon at Oxnard airport.

Paul Lamar

Paul,  water injection.  I knew a bloke who had one of the first 12A
cars.  He had a fantastic run with it and the car outlasted him.  He did
however install water injection as well.  Water injection has been
around back into the old kerosene Ag tractor days.  Again a neighbour
had one on his John Deere and claimed it made some improvement, but you
had to remember to turn off the water for 10 minutes before shutting
down the engine or it would rust quickly overnight.  Your mention of
water injection is again interesting as besides cooling the steam
generated gives increased HP.

Neil Unger.



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