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yakhunter
Joined: 10 Jan 2009
Posts: 4
Location: UK
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 Posted: Thu Sep 23, 2010 7:04 am Post subject: Yak-List Digest: 17 Msgs - 09/22/10 |
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Hi,
I recently had an issue with my 52.
In the cruise at 7 and 70% after about 30 mins there was a large engine cough and a puff of black smoke was seen by my play mates on the wing. This happened twice more en route back to base. Not very pleasant as it felt that the engine was about to stop.
All electrics seem good on inspection as do mags.
I believe a black smoke is fuel so we checked the filters and all are clean.
Any help or ideas would be gladly received.
Cheers
Gerald
G-HOGZ
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viperdoc(at)mindspring.co
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| Posted: Thu Sep 23, 2010 7:49 am Post subject: Yak-List Digest: 17 Msgs - 09/22/10 |
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Most likely a coil failure in the mags. Back on the terra firma after the coils/ engine have cooled off you cannot repeat it. Go fly for 20 to 30 minutes and you are rewarded with a heart stopping “Kaawhomp” with the blades stopping rotation for a heartbeat and you suck part of the chute up your rear. If you have a wingie at the time, they say you just had a big puff of black smoke belch for the stacks. That being because the coil caused a massive discharge the basically caused all the plugs to fire at once burning the fuel charge in the supercharger because one of the intake valves was open at the time of the discharge.
Change your coils and you will be a happy camper once again.
Been there done that and have a couple of T shirts because of it.
Doc
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Gpw678(at)aol.com
Sent: Thursday, September 23, 2010 9:57 AM
To: yak-list(at)matronics.com
Subject: Re: Yak-List Digest: 17 Msgs - 09/22/10
Hi,
I recently had an issue with my 52.
In the cruise at 7 and 70% after about 30 mins there was a large engine cough and a puff of black smoke was seen by my play mates on the wing. This happened twice more en route back to base. Not very pleasant as it felt that the engine was about to stop.
All electrics seem good on inspection as do mags.
I believe a black smoke is fuel so we checked the filters and all are clean.
Any help or ideas would be gladly received.
Cheers
Gerald
G-HOGZ
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richard.goode(at)russiana
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| Posted: Thu Sep 23, 2010 7:50 am Post subject: Yak-List Digest: 17 Msgs - 09/22/10 |
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Gerald-that is almost certainly high tension ignition [magnetos;plug leads etc.],not fuel,however much it might seem to be!
Weve seen this on 20 aircraft,and one magneto seems to affect the other,so no spark;it recovers,then burns the excess fuel,hence the black smoke.
It will normally get slowly worse!!
Richard
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
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pilotdog57(at)aol.com
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| Posted: Thu Sep 23, 2010 7:53 am Post subject: Yak-List Digest: 17 Msgs - 09/22/10 |
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I had similar symtoms that were caused by a blocked header tank vent. The "coughing" would become more frequent as the flight conditions were higher and or hotter. Check the fuel vents by unfastening them and blowing light air pressure through them. Be careful not to presurize the fuel tanks- only blow the air through the vent lines.
Doug Zeissner
Sent from my Verizon Wireless BlackBerry
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dsavarese0812(at)bellsout
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| Posted: Thu Sep 23, 2010 9:57 am Post subject: Yak-List Digest: 17 Msgs - 09/22/10 |
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You have a bad coil in one of the mags. The only way to duplicate it on the ground is to close the cooling louvers and get the engine temp up to about 220. The coil may start breaking down and you will be able to isolate it by the mag switch. Then you know which mag to pull.
Dennis
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