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jan.mevis(at)informavia.b
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 Posted: Mon Jun 29, 2015 9:15 am Post subject: Engine roughness, as in stops. starts. stops. starts. |
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Hi Richard,
Attached the picture that I got from you some time ago.
If I remember well, the impeller goes faster on the M14R.
Jan
On 29/06/15 18:57, "Richard Goode" <owner-yak-list-server(at)matronics.com on
behalf of richard.goode(at)russianaeros.com> wrote:
[quote]
<richard.goode(at)russianaeros.com>
We funded OKBM (Vedenyeev) for the development of the M 14 R. It genuinely
does give the power, but is rather too specialised an engine for general
use
as Jan implies. As he correctly says, Lyulka were responsible for the
supercharger, which is where the extra power is developed.
If you look at the impeller and diffuser of a standard engine, you will
see
that, in supercharger terms, they are very crude with the vanes only
having
single-plane curvature and clearly much less efficient than they could be.
So Vedenyeev went to Lyulka, who make the exceedingly fine and powerful
jet
engines for the Sukhoi 27 family of fighters, and they produced a new
impeller and diffuser with compound curvature.
Also the impeller is turned a little faster - unfortunately I can't find
the
figure at the moment - than the M 14 PF, which again helps.
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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mark.bitterlich(at)navy.m
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| Posted: Mon Jun 29, 2015 9:32 am Post subject: Engine roughness, as in stops. starts. stops. starts. |
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Jan,
Thought you might find it interesting that the Lycoming GSO-480 runs 1219 mmHg at take-off (48"). Continuing the conversation about fuel cooling the engine, this opposed 6 cylinder engine is "only" developing 340 horsepower but at this take-off power setting is burning 52 gallons per hour, versus your 58 GPH with over 100 more horsepower, so in reality you are doing quite well!
Mark
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jan.mevis(at)informavia.b
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| Posted: Tue Jun 30, 2015 10:38 am Post subject: Engine roughness, as in stops. starts. stops. starts. |
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I have one on my Yak 50.
Jan
From: <owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com)> on behalf of Todd McCutchan <todd(at)fastaircraft.com (todd(at)fastaircraft.com)>
Reply-To: "yak-list(at)matronics.com (yak-list(at)matronics.com)" <yak-list(at)matronics.com (yak-list(at)matronics.com)>
Date: Tuesday 30 June 2015 18:10
To: "yak-list(at)matronics.com (yak-list(at)matronics.com)" <yak-list(at)matronics.com (yak-list(at)matronics.com)>
Subject: Re: Re: Engine roughness, as in stops. starts. stops. starts.
Are there any M-14R's around?
Todd McCutchanT-34A & Yak-50
Cell: (260) 402-1740
E-mail: todd(at)fastaircraft.com (todd(at)fastaircraft.com)
www.fastaircraft.com
On Jun 30, 2015, at 7:38 AM, Bitterlich, Mark G CIV NAVAIR, WD <mark.bitterlich(at)navy.mil (mark.bitterlich(at)navy.mil)> wrote:
[quote]--> Yak-List message posted by: "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich(at)navy.mil (mark.bitterlich(at)navy.mil)>
I would be remiss if I did not ask how you define efficiency? Typically it is fuel burned to energy produced, and I would agree with you there, but then there is the matter of weight. I believe it is correct to say that the M-14 series produces more power to weight than any other radial built.
Mark
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jan.mevis(at)informavia.b
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| Posted: Tue Jun 30, 2015 10:44 am Post subject: Engine roughness, as in stops. starts. stops. starts. |
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I consider myself being very lucky to have bought one from you, Richard!
This engine is absolutely amazing.
It turned my Yak 50 into an exceptional plane.
Jan
[quote][b]
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mark.bitterlich(at)navy.m
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| Posted: Tue Jun 30, 2015 12:30 pm Post subject: Engine roughness, as in stops. starts. stops. starts. |
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Todd, realistically these model engines are in my mind "proof of concept" versions with a few extras made in the process. Rumor has it that M-14P.com (Jill) might have had some at one time. Worth asking if you want to go this path. Also keep in mind that in order to run one of these engines on a continual basis, you better have contacts to get parts and mechanics that know the engine to begin with. While I might drool over Jan's 50 (and I have), I would not want to maintain it in the United States. That is of course just a personal decision.
But a very reasonable alternative exists, and that is Monty Barrett. That gent has added home grown fuel injection, new ignition system, new higher compression (and quality) pistons and has taken the 360 HP M-14P to a tested 400 HP. Further, he made the same changes to the M-14PF (normally stock 400 HP) and sold one of those engines to Hubie Tolson for his Sukhoi 31. I have personally witnessed the increase in vertical penetration of his aircraft with this engine and it is an awesome change. Dyno runs on the modified PF model have it up around 430 HP, which is very close to Jan's engine but does so without spinning up the supercharger to extremely high speeds, thus it is an engine that should last a lot longer, and burn much less fuel (and oil due to the gapless ring design).
If you are looking for a real improvement to the M-14 original design, done with American parts and ingenuity, this is your answer.
Mark
p.s. This takes nothing away from Jan's 50. It is a one of a kind monster and I'd do all kinds of bad things just to be able to fly it once! 
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richard.goode(at)russiana
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| Posted: Tue Jun 30, 2015 11:17 pm Post subject: Engine roughness, as in stops. starts. stops. starts. |
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I can very much support the Barrett Pistons, which we have used a lot, although, with European bureaucracy, they are not authorised for use here. But a combination of PF supercharger; electronic ignition; high compression Barrett Pistons and other modifications that we have established produce a reliable 435 hp at 103%.
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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JL2A
Joined: 07 Apr 2015
Posts: 113
Location: Australia
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| Posted: Tue Jul 14, 2015 4:46 am Post subject: Re: Engine roughness, as in stops. starts. stops. starts. |
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Hats off to someone who posted it waaaay back in this now crazily fractured thread (mods? This is the only forum I've seen that does this)
It was an intake leak. Big one
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