Today's Message Index:
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1. 03:58 AM - Momentary Power Loss (Stressmerchant)
2. 04:44 AM - Re: Momentary Power Loss (Richard Goode)
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| Subject: | Momentary Power Loss |
I had a little heart-stopping moment on a routine flight yesterday. I was at about
2,000 ft on cruise settings when the engine very briefly cut, and then resumed
as if nothing had happened. No warning, no odd behaviour afterwards, just
a second of no power. The same thing happened about 5 minutes later, although
I had the impression that the second time the power did not die completely,
just cut back and then resumed.
CHT, Oil temp, oil pressure, fuel pressure all normal.
Some searching through the archives here suggests that it could be the coils starting
to go. I did wonder about carb icing, but the inlet temp was above freezing.
The aircraft is due for annual maintenance next week, so if something needs changing
this would be a good time to do it.
Any ideas about other potential causes?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=503006#503006
Message 2
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| Subject: | Momentary Power Loss |
I have to begin by saying that I'm completely biased on this topic, but this symptom
is extremely common and quite specifically caused by a breakdown of the
capacitor inside the coil through a combination of heat and age. The symptoms
you describe are absolutely typical, although no one has ever been able to explain
why the whole engine momentarily stops, given that one presumably has one
good coil and magneto. But it does! And if you continue to fly, it will slowly
get worse until the engine will completely stop for several seconds, always
after he to soak through to the magneto so typically after 25/30 minutes of flight.
As I wrote, we are biased since we have, after a lot of research, developed
a totally new coil with an external capacitor so does not have this problem
of the capacitor overheating inside the coil of hotwire and indeed for which
we have obtain full certification from EASA (European FAA) for these coils. We
have them in stock with John Warwick of the YakCollection in San Diego to avoid
excessive courier costs from Europe. I have also prepared a more detailed
paper on this topic and can send it to anyone if you ask us by email.
Richard
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode@russianaeros.com
www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
-----Original Message-----
From: owner-yak-list-server@matronics.com <owner-yak-list-server@matronics.com>
On Behalf Of Stressmerchant
Sent: 30 August 2021 11:58
Subject: Yak-List: Momentary Power Loss
--> <mike_beresford@yahoo.co.uk>
I had a little heart-stopping moment on a routine flight yesterday. I was at about
2,000 ft on cruise settings when the engine very briefly cut, and then resumed
as if nothing had happened. No warning, no odd behaviour afterwards, just
a second of no power. The same thing happened about 5 minutes later, although
I had the impression that the second time the power did not die completely,
just cut back and then resumed.
CHT, Oil temp, oil pressure, fuel pressure all normal.
Some searching through the archives here suggests that it could be the coils starting
to go. I did wonder about carb icing, but the inlet temp was above freezing.
The aircraft is due for annual maintenance next week, so if something needs changing
this would be a good time to do it.
Any ideas about other potential causes?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=503006#503006
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