ariekert(at)t-online.de
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 Posted: Thu May 17, 2012 6:49 am Post subject: Antw.: Yak-List Digest: 18 Msgs - 05/15/12 |
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Servus,
was hat es denn mit dieser mail auf sich? Ist schon zwei mal gekommen.....
Grûße,
Armin
----- Reply message -----
Von: "Yak-List Digest Server" <yak-list(at)matronics.com>
An: "Yak-List Digest List" <yak-list-digest(at)matronics.com>
Betreff: Yak-List Digest: 18 Msgs - 05/15/12
Datum: Mi., Mai. 16, 2012 09:01
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Yak-List Digest Archive
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Total Messages Posted Tue 05/15/12: 18
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Today's Message Index:
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1. 05:47 AM - Re: FW: M 14 P (A. Dennis Savarese)
2. 06:50 AM - Re: Performance Charts CJ6a and Housai 6a (mgdimarco)
3. 07:28 AM - Re: Re: Performance Charts CJ6a and Housai 6a (Brian Lloyd)
4. 07:35 AM - Re: Re: Performance Charts CJ6a and Housai 6a (George Coy)
5. 09:26 AM - Snap rolls Yak 50 (gord)
6. 09:41 AM - Re: Snap rolls Yak 50 (Bill Geipel)
7. 10:39 AM - Re: Snap rolls Yak 50 (Roger Baker)
8. 11:06 AM - Re: Snap rolls Yak 50 (gord)
9. 11:23 AM - Re: Snap rolls Yak 50 (Genzlinger, Reade)
10. 11:25 AM - Re: Snap rolls Yak 50 (Nigel Willson)
11. 11:49 AM - Re: Snap rolls Yak 50 (gord)
12. 03:15 PM - Re: Snap rolls Yak 50 (Herb Coussons)
13. 03:59 PM - Re: Snap rolls Yak 50 (gord)
14. 04:50 PM - Re: Performance Charts CJ6a and Housai 6a (Adrian Coop Cooper)
15. 06:16 PM - Re: Snap rolls Yak 50 (Herb Coussons)
16. 08:21 PM - Re: g-meter for sale (keithmckinley)
17. 08:51 PM - Re: Snap rolls Yak 50 (barryhancock)
18. 09:42 PM - Re: Re: Snap rolls Yak 50 (Roger Baker)
________________________________ Message 1 _____________________________________
Time: 05:47:34 AM PST US
From: "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net>
Subject: Re: Yak-List: FW: M 14 P
Chris,'
You should contact Barrett Precision Engines in Tulsa, Oklahoma. I
guarantee you they will have the answers you need. 918-835-1089.
Outstanding US overhaul shop. They have developed and have running a
beautiful coil-over electronic ignition (one coil per spark plug) and
fuel injection setup for the M14.
Most likely you will speak to Rhonda first. Ask Rhonda if you can
discuss some technical stuff with either Monte Barrett or Allen
Barrett. They will also have cylinders for exchange. Rhonda's email
address is Rhonda(at)BPAENGINES.com.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 5/14/2012 4:58 PM, Chris Wise wrote:
| Quote: |
G'Day All,
Can I please have some input re Ivor's questions.
I have done all of my valves, intake and exhaust and used some
grinding wheels (Dressed the angles with a diamond tip stone grinder
in the lathe. One hell of a mess) and made some various size mandrels
for both intake and exhaust to suite the slight differences of the guides.
I found the exhaust seats to be extremely hard and went by the angles
in the manual.
Hey Chris,
Do you know or could you find out if anyone knows what the M14P's
factory exhaust valve face and exhaust valve seat angles should be ?
Also, please ask if operators have had their exhaust valve seats
re-cut and if so, did they encounter difficulty cutting the seat due
to the hardness ?
After hearing about your difficulties, I am contemplating making a
diamond impregnated dressing stone for this task.
Any takers ?
Is there an exchange service for overhauled cylinders ?
I have a mate who requires 3 urgently. I guess when the leakage
exceeds the starting air flow, you have to either fit an electric
start or FIX the problem, eh ?
Cheers,
Ivor Paech LAME
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________________________________ Message 2 _____________________________________
Time: 06:50:53 AM PST US
Subject: Yak-List: Re: Performance Charts CJ6a and Housai 6a
From: "mgdimarco" <mgdimarco(at)yahoo.com>
I guess I'll have to hunt for a digital engine analyzer. Right now I have a digital
tach in one of the large holes (3.5"?). I'll bet I can use that space better.
Suggestions?
--------
Michael Di Marco
China Blue
mgdimarco(at)yahoo.com
407-608-3290
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=373090#373090
________________________________ Message 3 _____________________________________
Time: 07:28:50 AM PST US
Subject: Re: Yak-List: Re: Performance Charts CJ6a and Housai 6a
From: Brian Lloyd <brian(at)lloyd.com>
On Tue, May 15, 2012 at 6:48 AM, mgdimarco <mgdimarco(at)yahoo.com> wrote:
| Quote: |
I guess I'll have to hunt for a digital engine analyzer. Right now I have
a digital tach in one of the large holes (3.5"?). I'll bet I can use that
space better.
Suggestions?
|
Michael, I did it old-school. I did a lot of cross-country flying in mine.
Every cross-country flight was a test flight. (Only aerobatic and formation
flights were not used for data collection although I did find that fuel
usage tended to go up when flying on someone's wing.) I would use various
altitudes and RPM settings. I always flew with the throttle wide open,
accepting whatever MAP I got. (Because the engines use mechanical
superchargers, reduced RPM reduces maximum available MAP.) In flight,
calculate TAS. Then land, fill up, and use your E6B to calculate fuel burn.
(Calibrate your ASI first. I can provide you with a spreadsheet that will
let you determine TAS and winds aloft from three GPS ground track and GS
readings. You work backward to CAS from that.)
I did find that, by giving up about 10kts of TAS, I could often eliminate
at least one fuel stop. That ends up saving a lot more time in a day than
going 10 kts faster would make up for.
BUT, if you have a good fuel-flow gauge, you can get your data almost
immediately and then collect several data points per flight rather than
just one.
The problem with using the fuel specifics, i.e. g/hp*hr, is that they
change with the operating point of the engine. Also hp output is not
completely linear with changes in MAP and RPM. It is possible to model the
hp output from MAP and RPM for a given mixture but it is just a lot easier
to measure it and plot it against the actual performance of the airplane.
So, you set the power to something you think reasonable, e.g. 2100 RPM,
full-throttle, 9,500', mixture leaned for smooth running, and then see what
you get. When you land you can find out what your actual fuel burn was.
After all, knowing the hp output might be interesting but what most pilots
really want to know is what the airplane will do at a given power setting.
Oh, be sure to be consistent in the loading of the airplane even moving the
CJ can affect the performance results.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian(at)lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
________________________________ Message 4 _____________________________________
Time: 07:35:03 AM PST US
From: "George Coy" <george.coy(at)gmail.com>
Subject: RE: Yak-List: Re: Performance Charts CJ6a and Housai 6a
I have the performance data on a Russian AI14RA. The Housai seems to be a
License built AI14RA as far as I can tell. If you would lie the data, I will
scan it and send it.
--
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