Jerry Hey wrote:

I just got from Craig Catto's with my new prop.  It is a three

blade:

68 inch diameter and 80 inch pitch. Originally this prop was

intended

for a 200 hp Velocity but was too much prop and he could not spin

it,

so Craig took it back and hung it on the wall where it waited for me
to come along.  I got a very good deal.    Craig asked me if I

really

believed  the rotary could spin this prop and I replied, with plenty
of bravado,  that it would make a good "climb" prop.   However, when
I bolted it on, a few minutes ago, my confidence was shaken.  Can

the

little rotary really  turn this monster?     Jerry

You will have some clues when you get your engine running Jerry.
We can also test it on the dyno for static RPM.

Paul Lamar

Jerry
I hope you are going to use a 2.85 drive. If not send the prop. to me in
Australia. I will put it to good use.
Ian. 72 1/2 inch dia. 81 inch pitch. (1 inch + 2.54 real measure.)

Is that your current prop dia and pitch Ian? You have a two
blade and Jerry's three blade may have more blade area.

Jerry will have about 200 to 240 HP at 6000 RPM with
a corresponding amount of torque so he may not need
a 2.85:1 PSRU. He is building a peripheral port engine.

Paul Lamar

I presume that he has a tractor installation, and can use a pusher prop
because
he has the rotation reversal of the 2.15? ratio redrive. Send me the blade
width
measurements at .9R, .7R, .5R, and .3R and I will plug it into my prop
program for some predicted power versus rpm at a couple of speeds. I
suspect he is going to be bogged down pretty badly at takeoff and slow
climb. -Vance J.

 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2002 All world wide rights reserved.