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To: flyrotary@lancaironline.net
Subject: Airworthiness Cert issued....followed by blown enigne
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Message-Id: <8D03777D435766C-1378-671D@webmail-m220.sysops.aol.com>
Date: Fri, 14 Jun 2013 20:38:46 -0400 (EDT)
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N89SE received it's Airworthiness Certificate June 13, 2013! Yay!
So I put the covers on it an pulled it out of the hangar for a start up and=
 taxi test.
I have not run it this year while finishing the airframe.
So I started it up, a bit behind the curve on the EC-2, chasing the mixture=
 around etc, then settled in to a nice smooth high idle and taxi'd down to =
the far end of the runway where I ran it up to 4400 +RPM, checked the water=
 & oil temps, (158 & 167) pulled out on the runway, and fed the power to it=
 for a 2 or 3 second burst, to be pulled off to prevent flight.
Well the thing started well enough, I pushed the throttle slowly to about 2=
/3, and as the plane gained some speed, the CATTO 68x74 prop unloaded a bit=
 and the RPMs went up. The acceleration was profound for about 2 seconds fo=
llowed by a POP! as or just before I started to pull the throttle back.
Then came the grey smoke as I shut down the fuel pump and glided off the ru=
nway to the taxiway.
A few guys came running to help. One asked 'How ya doin'?" Medium I replied=
. (I'm OK and nothing is burning). Yada Yada, The plane is back @ the hanga=
r, and the oil leak (spew) is a cracked block at the last oil tap fitting o=
n the top gallery, by the distributor pulse counter. (1986 type)
Today I stripped the engine and pulled it off the airframe. Looking in the =
ports, all the tip seals move and are springy, but I think I detonated it, =
some damage is visible. Maybe in a previous tethered run (to 40" manifold p=
ress), and this time it let go. compression was down (prop pull method) I w=
onder if detonation under boost will crack the block (end irons)?

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<font color=3D'black' size=3D'2' face=3D'arial'>
<div><font face=3D"Arial, Helvetica, sans-serif" style=3D"background-color:=
 transparent;">N89SE received it's Airworthiness Certificate June 13, 2013!=
 Yay!</font></div>

<div>So I put the covers on it an pulled it out of the hangar for a start u=
p and taxi test.</div>

<div>I have not run it this year while finishing the airframe.</div>

<div>So I started it up, a bit behind the curve on the EC-2, chasing the mi=
xture around etc, then settled in to a nice smooth high idle and taxi'd dow=
n to the far end of the runway where I ran it up to 4400 +RPM, checked the =
water &amp; oil temps, (158 &amp; 167) pulled out on the runway, and fed th=
e power to it for a 2 or 3 second burst, to be pulled off to prevent flight=
.</div>

<div>Well the thing started well enough, I pushed the throttle slowly to ab=
out 2/3, and as the plane gained some speed, the CATTO 68x74 prop unloaded =
a bit and the RPMs went up. The acceleration was profound for about 2 secon=
ds followed by a POP! as or just before I started to pull the throttle back=
.</div>

<div>Then came the grey smoke as I shut down the fuel pump and glided off t=
he runway to the taxiway.</div>

<div>A few guys came running to help. One asked 'How ya doin'?" Medium I re=
plied. (I'm OK and nothing is burning). Yada Yada, The plane is back @ the =
hangar, and the oil leak (spew) is a cracked block at the last oil tap fitt=
ing on the top gallery, by the distributor pulse counter. (1986 type)</div>

<div>Today I stripped the engine and pulled it off the airframe. Looking in=
 the ports, all the tip seals move and are springy, but I think I detonated=
 it, some damage is visible.&nbsp;Maybe in a previous tethered run (to 40" =
manifold press), and this time it let go. compression was down (prop pull m=
ethod) I wonder if detonation under boost will crack the block (end irons)?=
</div>
</font>
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