Today's Message Index:
----------------------
1. 02:07 AM - Re: no MAP boost (Richard Romaine)
2. 02:46 AM - Re: no MAP boost (Richard Goode)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: no MAP boost |
When my previous HS-6A's supercharger stopped turning in flight (bearing failure),
the engine continued to run at reduced power. After divert it would not start
during ground troubleshooting, apparently flow disruption that didn't stop
engine was too much to overcome during a start attempt...once we were able to
check the accessary drive screen there was plenty of metal.
If it starts, I'm with Richard, I'd suspect indication related failure...but might
not hurt to check the screen anyway for peace of mind.
Rich
Sent from my iPhone
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
Some years ago when we were working very closely with Vedenyeev in Voronezh, Russia,
we came up with the idea for a significantly improved and more powerful
engine which I funded, and which we called the M 14 R. The big difference was
a completely new impeller and diffuser in the supercharger which we had designed
by Lulkya, who make the engines for the big Sukhoi fighters. This was a dramatic
improvement over the 60 year old impeller with single-plane curvature, design
of the M 14 P. Additionally we turned it at 11.5 times engine speed rather
than 10.4 times engine speed of the M 14 PF. Sadly the engine was never properly
developed, although it developed over 470 hp and clearly the potential for
much more.
But the new impeller and the added gearing put much more strain on to the supercharger
drive gears, and in practice a number of them failed. The relevance of
this is that, as Rich says, the engine continues to run but at reduced power,
and in this case quite a lot of reduction! I believe we sold five of these engines,
and at least two of them are still working, but I'm the first to admit
that the concept was excellent but the execution poor.
Having said that the owner of one of the M 14 R engine sent it to Aerometal last
year for overhaul, and we made the decision that we would examine the engine
in detail to establish what were the weak parts and with a lot of work did that,
so we now have all the engineering details we need as part of our plan to
put a totally revised M 14 R into production. But there are a lot of parts to
be made, and we are snowed under with "everyday" overhauls but it is our plan
to do it this year.
If anyone is interested, please email us and I can send photographs of the M 14
R supercharger impeller and diffuser! 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 SOVIET & CHINESE RADIAL 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 Richard Romaine
Sent: 31 January 2023 10:07
Subject: Re: Yak-List: no MAP boost
--> <romaine_richard@yahoo.com>
When my previous HS-6A's supercharger stopped turning in flight (bearing failure),
the engine continued to run at reduced power. After divert it would not start
during ground troubleshooting, apparently flow disruption that didn't stop
engine was too much to overcome during a start attempt...once we were able to
check the accessary drive screen there was plenty of metal.
If it starts, I'm with Richard, I'd suspect indication related failure...but might
not hurt to check the screen anyway for peace of mind.
Rich
Sent from my iPhone
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|