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Date: Fri, 28 Apr 2006 21:13:25 -0600
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: Engine Run and Static RPM Report
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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.

On Fri, 28 Apr 2006 22:35:30 -0400
Bulent Aliev <atlasyts@bellsouth.net> wrote:

> Hi Bob, looks like you are making lots of power. My DAR never asked  
> for high speed taxi, or even if I have run the engine. I don't think  
> high speed taxi is a requirement.
> Buly
> On Apr 28, 2006, at 9:24 PM, Bob White wrote:
> 
> > I've been trying to finish up all the little nitpicking details and a
> > few big details so I haven't ran my engine for quite a while.  I made
> > up my mind to get some time on it today.  The weather was a bit nasty
> > today with the winds kicking up to 20-30 kts (it wasn't that bad  
> > when I
> > started).  I fired it up, and the first problem showed up - No
> > charging.  The new alternator mount from Pineapple racing is power
> > coated and insulating the alternator from the block.  I rigged up a
> > jumper to fix that problem, and started the engine again.  All was
> > well.  After taxiing around for 1/2 hour or so, I hit 4 hours run
> > time.  Bruce T.'s break in instructions was to run the engine 5 hours
> > below 4500, but I couldn't stand the suspense any longer.  I really
> > wanted to find out what my static RPM was.  So, I stopped it heading
> > into the wind and gave it full throttle.  I saw 6400 RPM and backed  
> > off.
> > The mixture was going a little lean, so I turned up the mixture and  
> > got
> > 6600 RPM.  Max manifold pressure was a little over 23.  (Don't forget
> > that I'm at 6000 ft.)  That's a little over the 6000 RPM limit  
> > Bruce has
> > for the 5 to 15 hour segment, but his regime seems quite a bit more
> > conservative that some of the other break-in schemes I've heard on
> > here.  :)  With this prop, I suspect I could exceed my RPM redline of
> > 7500.  If everything is looking OK, I may increase that to 7700.
> >
> > It seems like I'm a little under propped.  This prop is 68 in. dia,  
> > with
> > a 78 in. pitch.
> >
> > I also found out that a little air flowing over the rads is a good
> > thing.  As I mentioned earlier, the wind was kicking up to about 30
> > knots toward the end.  While taxiing downwind, the water temp started
> > climbing above 200 F.  I shut the engine down, got out and pushed the
> > plane around into the wind.  After starting the engine back up, the
> > temps dropped down to 160F.
> >
> > Now the next big question is how badly will my new cowling and cooling
> > plenum screw up the cooling.  I'm only about 1/2 done with the cowling
> > mods and getting ready to jump back into some more fiberglass work.
> > Apparently according to the checklist my DAR sent, I need to do a high
> > speed taxi test.  I'm not going to do that until I think the plane is
> > airworthy, even if I don't have the paperwork!!
> >
> > Bob W.
> >
> > -- 
> > http://www.bob-white.com
> > N93BD - Rotary Powered BD-4 (first engine start 1/7/06)
> > Custom Cables for your rotary installation -
> > http://www.roblinphoto.com/shop/
> >
> > --
> > Homepage:  http://www.flyrotary.com/
> > Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
> 
> 
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/


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