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Subject: RE: [FlyRotary] Re: Dead Rotor at 3000ft
Date: Sun, 24 Dec 2006 08:16:26 -0600
Message-ID: <5B59870CA143DD408BD6279374B74C8B010C2050@MAIL02.austin.utexas.edu>
Thread-Topic: [FlyRotary] Re: Dead Rotor at 3000ft
Thread-Index: AccnY2U5/zirJbcoTxa2qd2M0sUmZgAArQg4
References: <list-1711217@logan.com>
From: "Steitle, Mark R" <mark.steitle@austin.utexas.edu>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

This is a multi-part message in MIME format.

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Good points Ed, but how many hours were on this engine before it was =
installed in this airframe?  More importantly, how many hours were on =
these rotors?  Were the apex seal grooves checked for excessive wear?  =
It will be interesting to see what Joe finds upon teardown. =20
=20
Mark

________________________________

From: Rotary motors in aircraft on behalf of Ed Anderson
Sent: Sun 12/24/2006 7:55 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Dead Rotor at 3000ft


Mark, while there was some folks who felt that not having an air filter =
was
a factor.  I do not concur with that hypothesis myself.  Tracy Crook has
over 1600 hours without an air filter.  While I certainly believe that
grit/grime (as you described it) can increase wear, I just don't think =
that
100-200 hours would result in significant wear - unless you perhaps live
where airborne dust is very heavy and fairly constant.

We are airborne most of the engine running time and unless you are in a
region with frequent dust/sand storms I personally do not believe that =
it is
that significant a factor.  Also, I would expect to see compression and
power decreasing due to the same wear before it got bad enough to cause =
a
seal to fail.

So given the very few hours that Joe has on his engine, I just don't =
think
that was a significant factor.  But, all this is assessment is my =
personal
opinion - and we all know what that's worth {:>)

Ed


 ----- Original Message -----
From: "Steitle, Mark R" <mark.steitle@austin.utexas.edu>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, December 24, 2006 8:43 AM
Subject: [FlyRotary] Re: Dead Rotor at 3000ft


Ed,

Adding my 2 cents worth on the subject... back when you had your =
rotor/apex
seal failure, I vaguely recall some comments being made about the =
importance
of running an air cleaner at pattern altitudes.  With the oil trapped in
between the apex seals and the rotor (as it should be), injesting fine =
dirt
which is then mixed in with the apex seal oil creates a gritty, "lapping
compound" like mixture that will cause rapid wear of the apex seal =
slots.
Is this correct, or have I totally lost it?  Could this be the cause of
Joe's failure?

Mark

________________________________

From: Rotary motors in aircraft on behalf of Ed Anderson
Sent: Sun 12/24/2006 7:26 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Dead Rotor at 3000ft


Ok, Joe. As you probably recall, I lost an apex seal (two actually) on =
one
rotor back a couple of years ago.  My conclusion was that the problem
resulted from a combination of using used rotors in which the apex seal
slots were wallowed out taking them from a vertical slot to a "V" shape.
When I took the engine apart and measured that parameter (seal slot =
width),
I found it was considerably out side the specs.  I was also using Hurley
seals from Atkins.

I surmised that the combination of the "V" slot which lost its ability =
to
support the side of the seal and the softer Hurley seals lead to one
fracturing and that piece taking out the following seal.   So I now know
that the wear specification for that apex seal slot is something to pay
attention to.

I went to new rotors and now use Tracy Crooks apex seals (much, much
stronger than stock or Hurley).

Ed

----- Original Message -----
From: Joe Hull <mailto:joeh@PilgrimTech.com>
To: Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
Sent: Sunday, December 24, 2006 12:00 AM
Subject: [FlyRotary] Re: Dead Rotor at 3000ft


Thanx Ed. I'll double check but pretty sure I'm at 35.


Have a very, very Merry Christmas too! (hoping the spouse and others =
gift
you with many aviation toys!)


Joe


________________________________


From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Saturday, December 23, 2006 8:31 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Dead Rotor at 3000ft


Joe, Sorry to hear about your problem but glad to hear you brought her =
back
safely.  Does certainly appear you have a bad apex seal.  You might want =
to
check your ignition timing.  I once mistakenly (of course - who would to =
it
intentionally {:>)) sat my static timing to 45 deg rather than 35.  I
noticed while flying that If I opened up the throttle wide open the note =
of
the exhaust changed to a staccato popping.  Well did not fortunately =
lose an
apex seal but I found the center electrode ceramic cone was missing for =
two
of the 4 plugs and cracked on the other two.  Just lucky they didn't =
take
out the apex seal.  So you might check that timing just to be certain.


"Merry Christmas"?


Ed

----- Original Message -----

From: Joe Hull <mailto:joeh@PilgrimTech.com>

To: Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>

Sent: Saturday, December 23, 2006 11:15 PM

Subject: [FlyRotary] Dead Rotor at 3000ft


The weather today in the Seattle area was marginal for flying - but a =
nice
hole opened around my home airport (KAWO) and I was there tinkering with =
the
plane anyway (re-torqueing the prop)- so up I went. I did 4 touch and =
goes
just for a wee bit of practice and then departed the pattern toward a =
bigger
hole that would be legal to climb through VFR. I flew about 30 miles
northwest of the airport out to the edge of the Puget Sound and enjoyed =
just
being in the air. Power setting was about 4400RPM and I was loping along =
at
a lazy 135kts.  I turned around and headed back for Arlington and =
decided to
ramp up the power to ramming speed - errr I mean cruising speed. In a =
few
minutes I was cruising along at 170kts at about 5500RPM. Then all of a
sudden BAM - the engine stumbled and RPM's dropped to 2300RPM.  I
immediately throttled back and switched tanks while turning toward the
airport. Altitude was 3200FT (about 3000AGL) and I was maybe 7 miles =
from
the airport. The engine was running real rough and wouldn't give me more
than 2300RPM. Even with that little bit of power I ended up entering the =
45
to the pattern at about 800 above pattern altitude. It was pretty slow =
at
the airport so I easily made a normal landing and was able to taxi back =
to
the hanger under power.


At the hangar I double checked everything I could from the cockpit - =
fuel
pressure good at 36PSI, oil pressure good at 55PSI at 2300 RPM, =
MicroTech
ECM showed "OK" for the size major areas it monitors. So, I shut it down =
and
pulled the cowl. I pulled the prop through a number of times and it =
seemed
that there was a couple places where I should have been hearing a "pop" =
in
the exhaust but didn't. I also notice that there is a nice ding in the =
prop
that is about an inch long - that wasn't there when I left (remember I'm =
a
pusher).


I got the engine compression gage and proceeded to take the spark plug =
out
of the front rotor - top - BR9EQ-14. Hmmm - I don't remember there being =
a
casing around the electrode - and why is that casing sliding?  =
Apparently
the casing around the electrode broke somewhere inside the sparkplug and
into two halves long ways down the electrode. Each half slides freely up =
and
down the electrode and even sticks out a little from the end.


I put the compression gage on and it looks like I get 30-30-70 when I =
turn
the engine over. I tried this several times and there is definitely a =
couple
of places where it only goes to 30. So I double check the location of =
that
ding in the prop - hmmm it's exactly even with the bottom of the exhaust =
-
right about where an apex seal would come out.


I put two new BR9EQ-14's in both rotors and did a quick run - 2300RPM =
rough
is the best I could get.


Some time this week I'll go up and yank the exhaust so I can see the =
apex
seals - my guess is I'm missing at least one. Bummer.


Joe Hull (getting tired of little surprises in the air).

Redmond/Seattle WA, Cozy-Mazda Rotary 71hrs


________________________________


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