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richard.goode(at)russiana
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 Posted: Sat Jun 09, 2018 11:27 pm Post subject: Carburettor inlet temperature gauge. |
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That is true, but they probably should have! The AK14P carburettor fit into the M 14 engines is actually not very susceptible to icing but it certainly does – the symptom being that the throttle becomes increasingly stiff and in the end simply won't move. We had a Yak 55 crash on finals a few years ago when the pilot realised that he was too low; attempted to open the throttle but it was jammed solid!
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of John B
Sent: 10 June 2018 00:59
To: Yak-List Digest Server <yak-list(at)matronics.com>
Subject: Carburetor inlet temperature gauge.
This question has been asked before, no doubt.
Why do we measure the carburetor inlet temperature on these M14-P engines?
Some of these airplanes don't have a carburetor heat feature.
Thank you!
John B
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Rob Rowe
Joined: 10 Jan 2006
Posts: 124
Location: Berkshire, UK
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| Posted: Mon Jun 11, 2018 3:51 am Post subject: Re: Carburettor inlet temperature gauge. |
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John B.
The carburettor heat scoop directs external ram air into the carburettor and there is a good reason why this heat is sourced from cylinder heads and not the exhaust system.
Simply exhaust heat would be too fierce and would risk detonation of the (now heated) fuel/air mixture in the supercharger where compression adds yet more heat.
Hence the cockpit inlet temperature gauge (sensor in the scoop intake) has a 10-45°C safe operating range and it's hazardous for the inlet temperature to become >60°C for the detonation reason given above.
This leads to an important pre-flight check to make sure the lower engine cowl retaining teather hook is in place, if it falls out it can work its way back in-flight into the inlet air heat scoop opening and (on operation) can jam it in the closed position ... on a summer's day that can easily take you past 60°C.
Also note that it can fall out in-flight with aeros and, on my aircraft (yours may be different), seems more likely to do so if the hook is installed from the front facing the rear. Hence I make sure during pre-flight checks that the hook is installed from the rear i.e. facing forward.
Hope this helps.
Rob R
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richard.goode(at)russiana
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| Posted: Mon Jun 11, 2018 4:59 am Post subject: Carburettor inlet temperature gauge. |
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Of course, you're talking about the Yak 52, and the 18 T has a similar
system. But Sukhois do have ram cold air to the carburettor, but then this
is allowed to mix with hot air from the cylinders, and there is absolutely
no alternative air available!
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
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