richard.goode(at)russiana
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 Posted: Mon Jul 01, 2013 4:52 am Post subject: Russian and Chinese engines |
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We have disassembled an HS6 engine and compared it to an AI 14, and were very surprised by the large number of detail differences in most parts of the engines. It is clear that the Chinese decided to "improve" the engine in a variety of ways.
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 George Coy
Sent: 01 July 2013 13:25
To: yak-list(at)matronics.com
Subject: RE: Magnetos
I do not know the DZ5 magnetos. I suspect they are same as the M9-35 mags that are used on the AI14 Engine. The Housai engine is identical to the AI14 engine. Probably originally license built. The Kamov helicopter engines all had the M9-35 and many of the M14P engines we supplied had the M9-35 magneto. The basic difference to the airplane is the starting system is different as it uses a “vibrator” style of start instead of the high voltage “shower of Sparks”. We often use the “Slick Start” for these mags. The other difference as [pointed out is the initial timing is different to accommodate the centrifugal advance system.
George Coy
From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com)] On Behalf Of Walter Lannon
Sent: Saturday, June 29, 2013 12:40 AM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Magnetos
Hi All;
I have a question basically for Richard Goode and George Coy but also for anyone else interested. It is a result of the following question to me : ------ “Can I replace my M9F magneto on the M14P with a DZ5 (Chinese) magneto?”.
My answer has been a qualified “No, I don’t think it’s a good idea” even though I know it has been done and the reported results are good. This response has nothing to do with the different timing requirements of a fixed spark mag. VS an auto advance mag. which I try to explain to the questioner.
To the best of my knowledge there are only four versions of this magneto: 1. The basic M9 of which the DZ5 is a license built copy (though, I guess we could call that 2 versions), 2. The M9-25M, 3. The M9-35M and 4. The M9F. Versions 1 & 2 are auto advance type with a range of 23 to 27 degs. Version 3 is also auto advance but with an extended range of 23 to 37 degs. and version 4 which is a fixed spark magneto with no auto advance mechanism.
The basic M9 (DZ5) to the best of my knowledge is the standard magneto on various engines with a maximum RPM of less than 2400. The M9-25M and the M9-35M are approved alternates for the M14P and the M9-35M is the standard magneto for the M14PF. Much of this is my observation and not necessarily fully accurate.
Since the M14P and, presumably, the M14PF engines have a much higher maximum RPM than the earlier versions I suspect that the M25M and the M35M (in addition to the extended range of the latter) have a different advance mechanism than the basic M9 (DZ5).
I expect there are different counter weights and/or return spring tensions involved. Am I right or wrong? If wrong what is the actual difference between the M9 and the M9-25M?
Have at it guys!!
Cheers;
Walt
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