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mark.j(at)yakuk.com
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 Posted: Tue Jan 03, 2006 12:37 am Post subject: prop pitch |
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Craig, I think you will find the one that’s least course is for the Yak 50. Still there are very few of those “rings” about.
Cheers, mj
Time:
04:30:55 AM PST US
From:
"Craig Payne" <cpayne(at)joimail.com (cpayne(at)joimail.com)>
Subject:
Prop Parts and Pitch | Quote: | | I'll admit that I'm always learning something new about these aircraft....no matter how long I'm around them. Since purchasing a brand new Vperiod B-530 TA six years ago I have learned lots of *stuff* about it, which parts interchange with the CJ prop, what is under the paint on the blades, etc. I have always known that the Russian paddle blades came in different blade diameters but I had assumed that everything in the hub was the same between different versions. |
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pilot8kcab(at)hotmail.com
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| Posted: Wed Jan 04, 2006 6:44 am Post subject: prop pitch |
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Craig,
I'm curious as I have the same symptoms you describe (unable to achieve
Cruise 2 settings) on my Yak-55 and we havent been able to pinpoint the
cause, does/did your prop pass the normal prop tests during the runup. My
prop passes the runup tests just fine but in flight the prop wont pull back
to even the Cruise 1 settings without reducing power and in all honesty the
Nominal 2 setting (70%) is tough to achieve without a power reduction
(reducing MP). Blade angles have been checked and reset, two governors
produced the same results. This metal ring you discuss is a glimmer of
hope.
Scott
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wlannon(at)cablerocket.co
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| Posted: Wed Jan 04, 2006 10:17 am Post subject: prop pitch |
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The "metal ring" is the factory adjustable coarse pitch stop on all V530
type propellors.
I do not believe it is the cause of the symptoms described.
In my opinion the cause is the low RPM limit stop screw assembly attached
to the prop. governor.
The governor set-up procedure described in the M14P manual is absolutely
correct and is identical to the procedure in the Hamiliton Standard manual
for their operationally identical equipment.
However, it is quite impossible to set up in accordance with the manual due
to the existance of the RPM adjustable stop assy. attached to the governor.
The only way that could be accomplished is to cut the low RPM stop off of
the assy. to allow the governor full travel to the low RPM position. This
stop screw is worse than redundant. The correct low RPM stop assy. is
contained in the governor head and is set up at governor overhaul. You
cannot just remove the whole assy., the high RPM stop is necessary.
With that external stop in place the governor is limiting the blade pitch to
a value less than would be allowed by the PROPELLOR coarse pitch stop (the
magic ring) so removing or reducing this will have no effect whatever in
normal ooperation. Removing or substantially reducing the ring would not be
noticed until a failure causing loss of governor oil pressure allowed the
blades to go to an angle too high for the engine to handle. Don't mess with
the ring.
The Chinese use the same totally unnecessary stop screw but revise the
manual procedure to accomodate it with no regard to the fact that their
procedure is quite wrong.
Walt
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