-- 
Paul Lamar ...No rotor no motor.

Paul,

These are the PSRU units that we are using we are currently going thru a
bell housing integration directly to the RotaMax engine. We will have them
at Osh Kosh this year.

Eric Barger, President
Phone 419-694-3000 x 222

RotaMax Inc.
15152 Twp Rd 190
Arlington, OH 45814
Fax 419-694-1401
www.rotamax.net

-------------------------------------------

What ratio  will we be able to buy Eric?
-- 
Paul Lamar ...No rotor no motor.


Paul,

2.2:1 on the Single engine at 5250 Max RPM
1.9:1 on the Twin engine at 4750 Max RPM

We will be submitting prop testing ground and in flight in the weeks to come
stay tuned. We are getting some very nice performance at the lower RPMS as
well as the benefit of less noise, heat etc. We believe the lower RPM suite
the market for our engine well and as stated above some more testing will
validate this.

Thanks for all you support.

Eric Barger,
RotaMax Inc.
www.rotamax.net

As you gain more flight experience I think you will wind up with lower
ratios.

Pilots cannot have too much HP. It helps getting out of
tight situations and you don't have to use it if you don't need it.

The Rotax 912S is rated for max 100 HP for only one minute.
Most certified air cooled aircraft engines are rated for only
5 minutes at max HP. This is done for getting out of short fields
with heavy loads. Of course variable pitch props help as well
as it allows the engine to rev up and generates more thrust and HP.

A key to this is the engine RPM  WOT on the ground when the airplane is
stationary.
The higher... the better with a variable pitch or constant speed prop.
A high number is also good with a fixed pitch prop but not too high.

That means your initial acceleration is as high as it is going to get
when taking off from a dead stop. One needs to get to flying speed as
quickly
as possible and climb out at a good angle to clear the trees.
In a worst case scenario it is a safety issue.

Paul Lamar


Paul,

We will have 1.9, 2.2, 2.4 and 2.7. an important fact about our current
engines and program. We are ready to begin the ASTM qualification testing.
We have to state a top RPM and cruise RPM as part of our documentation
before testing. We cannot over rate our engine operating parameters as it
relates to RPM and thus HP or we would eliminate several LSA manufacturers
from using our engines. Their airframes were based on the Rotax 912 100HP
engine and we will be giving them 120HP in the twin at 4750 RPM. This is
also where Torque begins to drop in the current configuration. I agree you
can never have too much HP in many applications, although you can have too
much in LSA due to the speed limit and weight restrictions as well as the
airframe designs.

Eric Barger,
RotaMax Inc.
www.rotamax.net

Well it also affects the power to weight ratio of an engine.
I don't think the ASTM  limits the minimum weight of a LSA aircraft.
Just the maximum gross weight as I recall. I could be wrong.
It takes a lawyer to really know :)
I suspect the manufactures  think, and some have mentioned this to me, the lighter
the engine the better.  I think your one rotor with 100 HP would be a better
match to the Rotax 912S in LSA.
-- 
Paul Lamar ...No rotor no motor.

The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Youtube key word UTUBPLEASE
Copyright 1998-2008 All world wide rights reserved.