Perry Mick wrote:

Paul,
Here are some photos of the Cosman prop. Tractor, reverse rotation
2.17,
72" diameter, 88" pitch. The blades are carbon, the hub is
hardwood/composite 9" in diameter and 5" thick. The mounting holes
still
have to be drilled. The pitch twist is maintained all the way to the
hub, as it is in ducted fans. I will be sending it to you for testing
on
your test stand when it is ready.

--
Perry Mick
http://www.ductedfan.com

You do beautiful work Perry.

Paul Lamar

Jerry Hey wrote:

Paul,  how much hp will your test engine develop?  I  have a three
blade,  Craig Catto,  that will  need at least 180 hp.  2:17 .  Jerry

Good point. Perry may need to find somebody with a 3 rotor to test that prop.

Initially, with my low compression rotors, normally aspirated and 2.17:1 I'll be 
lucky to see 160 HP. It won't be until I get the turbo on there will I see over 200 HP.

Here is a picture of some of the test engine plumping I did yesterday. The flow meter is
shown. I found this wonderful silicone hose at McMaster Carr for a dollar an inch.
-45 to 250 degrees F. Not your average car cooling system hose. The clear hose
is to check for air bubbles in the test engine.

BTW are you ready to weld up so more motor mounts?

Also BTW I got this engine for free because the owner could not find a mechanic
that could make it run right. Turned out it was a cracked rubber elbo in
the intake air plumbing to the turbo buried down under a bunch of other stuff.

Paul Lamar
 
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