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Message-ID: <4A43F39F.6050200@gmail.com>
Date: Thu, 25 Jun 2009 17:01:03 -0500
From: Dave <david.staten@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Consistant progress...not sure how to act?
References: <list-3732269@logan.com>
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Bill Bradburry wrote:
>  You are at what? 500 ft? 
More like 42.

> I have seen several methods for finding leaks on this list.  Get a can of
> WD-40 with the little red tube on it so you can control it and not make much
> of a mess, and with the engine idling, spurt(very small spurt) WD-40 on each
> crack and cranny on the intake system. Spurt, listen for the idle speed to
> increase, spurt next place.  Don't forget where the injectors install, it
> could be leaking around them.  Idle increase=leak.  No change=no leak.
> Be careful there is a prop on there.  Do this with someone. Don't spray the
> exhaust!
>   

I actually thought of recommending this.. but honestly with the wings on 
and the prop RIGHT there.. this is simply too dangerous unless someone 
wants to lay on the strake. Otherwise a propstrike is extremely likely. 
Starting fluid has the same effect, and evaporates completely, not 
leaving an oily mess on the engine.

> Fix the leak before you do anything else. 
>   

Agreed. Tuning comes WELL after troubleshooting. You cant fine tune 
something that isn't in the ballpark.

As for chris's data point.. 29" mp is wide open throttle at sea level. 
the 11 gph if calibrated correctly is more like 130 to 145 hp. (using .5 
to .45 lb/hp/hr BSFC). Key words are if things are calibrated correctly. 
It will take several long fuel burns/fills to get that correctly 
calibrated..  or take 5 gals EXACTLY and run it out.. bone dry.


Once the motor has its teething issues addressed, and THEN once the 
instrumentation is properly calibrated, then you can do some real tuning 
and optimizing.

Dave