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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1134870@logan.com>
Subject: Re: [FlyRotary] Status Update
Date: Wed, 31 May 2006 20:02:08 -0400
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Glad to hear you are back in the air, Joe.

Joe, Oil pressure sounds fine to me in the 4000 rpm range.  However, I get 
70 psi at 5000 and above and its been that way since first flight in 1998. 
I forget the details of your project, but from your e mail it sounds like 
you have an fairly straight forward oil installation.  I know the racers 
sometimes have oil foaming at higher rpm which can reduce oil pressure (tiny 
air bubbles in the oil), but have not know it to be a problem with the 
flying crowd.  Also I have found   high oil temps can cause a 5-10 psi drop 
(depending on how hot).  My system if filled with 4 1/2 quarts of oil, so I 
would say you have plenty of oil.

Also forget your prop dia and pitch, so can't comment on whether you are 
over propped, but that is not that uncommon on first flights as I think we 
all over estimate the power we are going to initially produce {:>).  I will 
tell you that in almost all  cases power increases as tuning and associated 
things are improved - so don't cut down the prop, just yet.   My initial 
flights were in the power range or around 135-140 HP because I had initially 
put a racing induction system, and I was certain I was  going to produce 
gobs of power because the components were all race components - didn't work 
out that way.   Unless you have a pretty restrictive filter I doubt you will 
find removing it makes much difference. I was using a 2.17 gear box and a 
68"x72" prop for reference.

You'll work all of this out, nothing I see to be alarmed about.

Ed


----- Original Message ----- 
From: "Joe Hull" <joeh@pilgrimtech.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, May 31, 2006 1:35 PM
Subject: [FlyRotary] Status Update


> Since I got my engine back in the plane two weeks ago a couple of things
> have happened I thought I should report on. First, I got my medical back
> (sleep apnea issue resolved with the FAA until next year). Second, it
> stopped raining for a couple of days and I was actually able to go try out
> the re-built engine.
>
> Oil pressure is now about 59-60 in the 4000's RPM range. Still goes down
> slightly to 54-57 after 5000RPM. But that's a lot better than it was. Am I
> in the ball park now? The Haynes manual indicates that oil pressure should
> be north of 60 above 3000RPM.
>
> Now that I have reasonable oil pressure and can push the engine a little
> harder I'm seeing higher oil temps.  Water temp is OK no matter what 
> because
> the electric fan kicks on and keeps it under 190. But the oil temp is 
> about
> 205F at 4500RPM (54F OAT) and about 215F at 4900RPM. So, I'm planning some
> cowling changes to see if I can get more "suction" out of the cowl exits -
> and may add another exit area where I know there is low pressure.
>
> Still not happy about the lack of power. I know I'm still over propped for
> this engine. I put the plane into a dive to get the RPM up to 5700RPM 
> (best
> HP) and then level out and it cannot maintain the 5700RPM. About 5000-5200
> is the maximum I can maintain (depends on altitude). I'm going to try 
> taking
> the air filter out and see if that has any impact at all on RPM.
>
> Exhaust noise - my wife said the plane was way quieter than a "normal"
> airplane when I flew over our house yesterday at about 1500ft AGL. Of 
> course
> I was only turning 4200RPM so I could stay at about 100kts.  Also a guy at
> the airport said it sounded like I have a sewing machine in my airplane 
> and
> not an engine. I'm not sure whether he meant it was a loud sewing machine 
> or
> a quiet one (I was on my take-off roll and wasn't in a position to chat)!
>
> Thanx,
> Joe Hull
> Cozy Mk-IV #991 (In Phase1 Flight Test - 22.4 hrs flown)
> Redmond (Seattle), Washington
>
>
>
>
> --
> Homepage:  http://www.flyrotary.com/
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>