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From: Bulent Aliev <atlasyts@bellsouth.net>
Subject: Re: [FlyRotary] Engine Run and Static RPM Report
Date: Fri, 28 Apr 2006 22:35:30 -0400
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

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/
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