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Date: Sat, 29 Apr 2006 07:45:40 -0600
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Engine Run and Static RPM Report
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On Fri, 28 Apr 2006 23:23:21 -0500
Charlie England <ceengland@bellsouth.net> wrote:

> Bob White wrote:
> 
> >Hi Buly,
> >
> >There's a few things on the list he sent that doesn't sound quite
> >right.  As long as I can do it without too much of a hassle, I guess I
> >will.  The actual wording is "a ground run to max power in a nose high
> >attitude approaching an in flight stall".  That sounds like an
> >invitation to do an inadvertent take-off if I ever heard one.  When I
> >flew with the previous owner, the time from full power application to
> >lift off was about 5 seconds.
> >
> >I think the A&P may be a problem also.  I need one because I didn't
> >build the airplane.  He sounded OK when I first talked to him, but more
> >recently he's been talking about checking to make sure the plane was
> >built to plans and stuff.  I think he's supposed to check the brakes,
> >make sure the flaps aren't falling off, etc.  I think his implication
> >is that the original builder could modify anything he wanted to, but
> >that I can't.  This view seems to me to go beyond the roll of the A&P
> >as I understand it.  I may have to find another one that understands
> >experimentals.
> >
> >Bob W.
> >
> 
> "The actual wording is "a ground run to max power in a nose high
> attitude approaching an in flight stall". "
> 
> Hi Bob,
> 
> That phrase is a fairly common one in documents about prep for 1st flight. It normally means to find a ditch, put the tail in it & tie it down. Then do your full throttle ground run. The idea is to test both the engine & fuel delivery systems with the plane in its max climb attitude without having to discover any limitations in flight. The key words are 'ground run' meaning to do it *on the ground*, not in flight. Remember that almost any homebuilt can achieve a much higher attitude in climbing flight than it can achieve in any takeoff roll.
> 
> Hope that helps....
> Charlie
> 
Hi Charlie,

Yes, that helps a lot.  I like that interpretation much better than
what I was thinking about.  It seems like a good test as well.
Years ago there were several instances of BD-4's loosing power on take
off due to the location of the 'T' connecting the front and rear pickup
on the fuel tank.  As a result, a lot of people put in header tanks.
Some at the insistence of insurance companies.  I have made the
appropriate mod, and removed the header tank, but it should be tested.

Bob W.

-- 
http://www.bob-white.com
N93BD - Rotary Powered BD-4 (first engine start 1/7/06)
Custom Cables for your rotary installation -
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