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The Mark-18, together with the Mark-17 Power Unit Gearbox, was
intended to provide a bolt-in system to replace the notorious
4-cylinder piston engine and drive system in the RotorWay Exec
series of 2-place helicopters with a reliable 150-shp turbine
engine system.

The Mark-18 gearbox is a separate, specially-designed 90°
gearbox for the helicopter main rotor drive. It is NOT adapted
from racecar parts. It bolts directly to the existing main rotor
shaft and to the existing airframe components, and replaces the
lower bearing on the main rotor shaft. It has an optional main
rotor brake.


Thank,s Georges

I read the Mark-18 reduction unit and contact EPI for their
comments on my twin project with rotary engine.

Jean Prudhomme


I'll bet they tell you rotary engines are no good :)

Paul Lamar

Paul,
I have e-mailed back and forth with Jack Kane (EPI's principle) about PSRU
issues and he seems a very knowledgeable and dedicated guy. His stuff is
anything but cheap however. He has done a planetary but it is not his perfered
PSRU. He didn't badmouth rotaries durring our discussions, but he isn't
rotary knowledgeable by his own admission. We really need a reasonably priced,
hydraulic constant speed psru. The Mistral unit is beautiful, but pricy. If
those guys want to make some money they should sell to the home building
contingent.The Mistral unit looks almost as tough as the Bell unit and isset up
from the start for Hyd/CS use. It even has the provision for a secondary
alternator, now if we could only buy them for less than a kings ransom.
Bill Jepson

Did he tell you what his stuff weighs?

Paul Lamar