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Subject: Re: [FlyRotary] Re: Airworthiness Cert issued....followed by blown enigne
References: <list-6326469@logan.com>
From: Scott Emery <shipchief@aol.com>
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Date: Sat, 15 Jun 2013 00:19:27 -0700
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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The fitting is a parallel thread swivel elbow with a lock nut & seal ring wa=
sher. Spendy bugger.
Looking in the exhaust ports I see scratches and impacted ? Aluminum? On the=
 rotor face near the seals. On one rotor tip I think I can see the end of a s=
eal (chunk out of rotor tip @ edge) rote faces are shiney clean like detonat=
ion but engine has about 5 hours since overhaul

Sent from my iPhone

On Jun 14, 2013, at 7:47 PM, Kelly Troyer <keltro@gmail.com> wrote:

>=20
>=20
>=20
> On Fri, Jun 14, 2013 at 9:27 PM, Mark Steitle <msteitle@gmail.com> wrote:
> Sorry for the bad news, but good thing it happened on the ground. =20
>=20
> As for the possibility of detonation, it doesn't sound like it to me.  If i=
t was detonation, I would expect to find a broken apex seal or two.  Sounds l=
ike maybe an o-ring blew.  It could have even been a defective iron.  Pictur=
es would help. =20
>=20
> Mark
>=20
>=20
> On Fri, Jun 14, 2013 at 7:38 PM, <shipchief@aol.com> wrote:
> 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 an=
d 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 mixtur=
e around etc, then settled in to a nice smooth high idle and taxi'd down to t=
he 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 fo=
r 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 a=
nd the RPMs went up. The acceleration was profound for about 2 seconds follo=
wed 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 r=
unway to the taxiway.
> A few guys came running to help. One asked 'How ya doin'?" Medium I replie=
d. (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 on=
 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, s=
ome damage is visible. Maybe in a previous tethered run (to 40" manifold pre=
ss), and this time it let go. compression was down (prop pull method) I wond=
er if detonation under boost will crack the block (end irons)?
>=20
>=20
> What a letdown after your AW certificate.........Curious what type of fitt=
ing you have in that oil galley........As I recall from my
> 1988 13B front housing the side walls may be a little thin after threading=
.............If a tapered pipe thread fitting was used the=20
> pressure from the tapered thread can crack the hsg.......I would suggest u=
sing straight threaded fittings (US or Metric) with
> alum , copper or "O" ring for sealing.............FWIW
>=20
> --=20
> Kelly Troyer
> Dyke Delta_"Eventually"
> 13B_RD1C_EC2_EM2

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<html><body bgcolor="#FFFFFF"><div>The fitting is a parallel thread swivel elbow with a lock nut &amp; seal ring washer. Spendy bugger.</div><div>Looking in the exhaust ports I see scratches and impacted ? Aluminum? On the rotor face near the seals. On one rotor tip I think I can see the end of a seal (chunk out of rotor tip @ edge) rote faces are shiney clean like detonation but engine has about 5 hours since overhaul<br><br>Sent from my iPhone</div><div><br>On Jun 14, 2013, at 7:47 PM, Kelly Troyer &lt;<a href="mailto:keltro@gmail.com">keltro@gmail.com</a>&gt; wrote:<br><br></div><div></div><blockquote type="cite"><div><div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Jun 14, 2013 at 9:27 PM, Mark Steitle <span dir="ltr">&lt;<a href="mailto:msteitle@gmail.com" target="_blank"><a href="mailto:msteitle@gmail.com">msteitle@gmail.com</a></a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">Sorry for the bad news, but good thing it happened on the ground. &nbsp;<div>
<br></div><div>As for the possibility of detonation, it doesn't sound like it to me. &nbsp;If it was detonation, I would expect to find a broken apex seal or two. &nbsp;Sounds like maybe an o-ring blew. &nbsp;It could have even been a defective iron. &nbsp;Pictures would help. &nbsp;</div>
<span class=""><font color="#888888">
<div><br></div><div>Mark</div></font></span></div><div class=""><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Jun 14, 2013 at 7:38 PM,  <span dir="ltr">&lt;<a href="mailto:shipchief@aol.com" target="_blank"><a href="mailto:shipchief@aol.com">shipchief@aol.com</a></a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><font color="black" face="arial">
<div><font face="Arial, Helvetica, sans-serif" style="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 up 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 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 &amp; oil temps, (158 &amp; 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.</div>


<div>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 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 the runway to the taxiway.</div>

<div>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 hangar, and the oil leak (spew) is a cracked block at the last oil tap fitting 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 method) I wonder if detonation under boost will crack the block (end irons)?</div>


</font></blockquote></div><br></div>
</div></div></blockquote></div><br>What a letdown after your AW certificate.........Curious what type of fitting you have in that oil galley........As I recall from my<div>1988 13B front housing the side walls may be a little thin after threading.............If a tapered pipe thread fitting was used the&nbsp;</div>
<div>pressure from the tapered thread can crack the hsg.......I would suggest using straight threaded fittings (US or Metric) with</div><div>alum , copper or "O" ring for sealing.............FWIW</div><div><br></div>
-- <br>Kelly Troyer<br>Dyke Delta_"Eventually"<br>13B_RD1C_EC2_EM2
</div></div>
</div></blockquote></body></html>
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