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----- Original Message ----- From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, April 20, 2007 7:05 AM
Subject: [FlyRotary] Re: Single Rotor Testing
Richard Sohn wrote:
Tested my single rotor today. The first time with some real, reproduceable data.
The configuration is with one compound side housing. The other side housing is still sandwiched, using milled down MAZDA housing section.
This version weight for the nacked engine, flywheel and water pump included, is 90lb. This engine is based on 12A rotor and rotor housing. Intake is P-P.
Data:
RPM 4000
Fuel flow 2.5GPH
MAP 21"
EGT 1400F
O2 .650 = 15 (ratio)
At shut down:
oil temp 200F
Water temp 200F oil pressure was 50psi cold and hot, looks suspect.
The water pressure gauge did not work, which was the reason for shutting down after 7min runtime. I had planed to go to max water temperature, did not want to do that without water pressure.
The most interesting fact of this test is the possibility of a power estimate. Calculated power using a BSFC of .5 is 30 hp. Looking at the power curve of the LeMans engine, this is about 10% below of what is shown there. From this, I believe the projected over 100hp at 7500RPM is within reach.
Richard Sohn
N2071U
You will be able to get 1HP/lb after you add a gearbox, right?
,|"|"|, Ernest Christley |
The gearbox is 23lb, so it will be a little less. However you would need all the other stuff under the cowling, which will make it a 179lb FF.
This weight is comparable with a 912.
Richard Sohn
N2071U
----===<{{(oQo)}}>===---- Dyke Delta Builder |
o| d |o http://ernest.isa-geek.org |
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