Mailing List flyrotary@lancaironline.net Message #46413
From: Ed Anderson <eanderson@carolina.rr.com>
Subject: RE: [FlyRotary] Water Temps
Date: Sun, 14 Jun 2009 08:27:46 -0400
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>

Ok, John,

 

The engine knows what it likes.  However, if accurate - an A/F of 15:1 should show you a fuel flow of approx 10.5-11 GPH (at 5000 rpm WOT) producing approx 117 HP.  An A/F of 12.65:1 (Best Power)under the same rpm  should show a fuel flow of approx 12.5-13 GPH producing around 135-140 HP.

 

I find that on take off on a nominal day I typically show between 17 and 18 GPH on a cold day as much as 19-20 turning 6000 rpm (with a 2.85:1 RWS redrive)

 

Ed 

 


From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of John
Sent: Sunday, June 14, 2009 8:05 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Water Temps

 

Tracy, your temperature cutoff makes me feel a little better.  Yesterday I checked the crankcase and there was no sign of glycol odor or glycol.  I ran the engine .2th's hour taxing trying to get used to the not having a steerable nose wheel, the brakes were considerable cooler.  OAT was at 78, with cowling off and moving the WT was 165 degrees.

 

On Ed's question of the air - fuel ratio, I have a meter and sensor from Edelbrock and with the 1:15 light on, the engine runs the best, as for the accuracy of the instrument, who knows.

 

At one time a while back there was much discussion on prop's, the prop I have is a Fred Felix bi-cambered of 68 x 70, as I recall it was mentioned about prop stall, would I be experiencing this, as the engine will go from idle to 5,000 rpm almost instantly, sure is different than the ole Lycoming in the Piper Colt.

 

The Marcotte re-drive has the filler plug at a level where nearly 90 % of the ring and pinion is submerged in 80 hypoid.  The surplus grease was dispelled out the vent on the overflow bottle and ran down the firewall, very small amount of 80w makes awful big mess.  JohnD



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