Paul,

   I am a retired Navy SEAL and EZ pilot.  When I was single I
completely overhauled an O-320 powered vari-eze (N15DV).  13 years
later, I am married with children and it is now time to start building
our "family" plane.  I have always been wanted to re-power the vari with
a rotary, but with the new project, I want to build a rotary powered
Cozy IV.  I recently read your article on compounding the rotary.  I
have decided to start my project with getting the power plant built. I
want to build a p-port, compound engine that is at least 300hp, fuel
injection and electronic ignition (I have a Lightspeed ignition on 15DV
and love it!). Due to living in AZ I also need to hang a A/C unit on it.
I would also like to adapt/devise a muffled exhaust system for it.

   I have some questions and your knowledge and experience would be
helpful in making some decisions about my new project.  I am unsure if
my project parameters are more suited for a  2,3 or 4 rotor engine. How
does compounding affect intake; is turbo/supercharging a natural part of
compounding the engine?  Will it be possible to "muffle" the output of
the wategate on the turbine.  Has anyone completed a compound engine as
you describe in your website articles? I look forward to hearing your
thoughts.

Please add me to the newsletter.

Cheers,
William "Court" Bollinger
Trident Tactical Services


Thanks for your service to our country.

It is not cheap to compound a rotary. The turbo compound unit I used
from a Detroit Diesel
DD15 is not light weight and cost $2000 dollars. Only suitable for a
test TC 3 rotor.  Not
a flight engine. Too heavy. You need to find a suitable turbine from a small
jet engine that is about 18 inches in diameter and rotates in the range
6000 to 8000 RPM.

Then  build something like this. Then you have a chance if you are lucky
with the blade
angle. If it works you will get 300 to 350 HP with a fuel burn in the
diesel range.

You can hammer the SS sheet metal with a wood mallet and a sandbag. Sun
n Fun  in
April in Florida has a work shop that teaches that skill.
You will also need some tig welding skills. If you send the parts me I
can have
them tig welded by my ace welder.

BTW  I will be there giving some talks on the ignition and the uni motor
mount..

Frank Whittle built his early jet engines with these skills.

Paul Lamar

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You can make you own hollow self air cooling turbine blades with a tig welder and a slitting
saw. You make it out of SS 316 2 inch OD .065 wall and 3 inch  OD .065 wall
tubing from master car. Each inch of tubing produces 3 hollow blades one inch long.
36 blades from each foot of tubing.

Here is how.  You must keep the EGT down to 1500 F. Cool the exhaust if necessary.

Paul Lamar

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