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That's
possible. I'm not sure how much it sagged, but it seemed
significant. May have only been a couple hundred RPM's though. At
least while still on the ground, it didn't have the same pucker effect that it
would have a little later.
I was
really impressed with the engine performance, just before it sagged. It
really put me back in the seat on the takeoff roll. If I had pushed it to
full throttle, I'd probably been really impressed. Of course, I'd been
airborne earlier, so it's a good thing that I didn't
Steve
I get the spark plug sag after about 50-100 hours on a
set of leading plugs. It usually happens the first time after takeoff and I'm
a few hundred feet in the air, but it's never that "drastic", just 100-200 RPM
drop. It does get your attention!
Kelly Troyer wrote:
Steve,
May be the famous "Spark Plug Sag" as reported by Tracy
and Ed !!
--
Kelly Troyer
Dyke
Delta/13B/RD1C/EC2
--------------
Original message from "Steve Brooks" <prvt_pilot@yahoo.com>:
--------------
> I went to South Carolina Thursday to
replace the fuel regulator, and do some
> flying. I replaced the
regulator, and ran the engine some on Thursday, but
> no flying
because it was getting dark.
>
> On Saturday, I went to fly,
and had some trouble getting it to stay running
> due to the cold
temperatures. I probably didn't keep it rich enough, long
> enough.
I taxied out to the far end of the runway (5000'), and took the
>
runway for take off.
>
> As I accelerated to about 90 kts, I
was just rotating when to power dropped
> substantially. I cut the
throttle, and aborted the takeoff.
>
> I don't know exactly
what caused the sag. I pulled the throttle all the way
> back
during the aborted takeoff, and the engine died. I have my idle stop
> set a little low (400 RPM's), and usually don't pull it all the
way off, but
> even when I do, it has never died.
>
>
I restarted it, and ran the power up to about 4000, and it seemed OK.
>
> Another issue with my right main wheel bearing prevented
me from making any
> more high speed runs. The right wheel has been
making noise, and I was
> trying to resolve it with the mfg, but
during the aborted take off, it
> really made allot of noise, and
also vibrated pretty good at one speed, so I
> decided that I
better get that fixed before doing any more flying.
>
> I
changed the fuel regulator, so I guess that it could have been some air
> still in the fuel line, but the engine had probably run for at
least 10
> minutes prior to the take off roll. It also could have
been some water,
> though I've never found any to date during
preflight. The engine was
> running at 5 lbs of boost and abo ut
5000 RPM's. It was about 45 degrees,
> and the plane was
accelerating very strong prior to the power loss. I don't
> know if
it would have picked back up, but I was glad that it didn't happen 5
> seconds later.
>
> Steve Brooks
>
>
> >> Homepage: http://www.flyrotary.com/
>
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