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CJ Prop Blade Angle Procedure

 
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PS



Joined: 08 Sep 2006
Posts: 84
Location: Texas

PostPosted: Thu Jul 05, 2018 5:21 pm    Post subject: CJ Prop Blade Angle Procedure Reply with quote

I have been fighting setting blade angles for my Housai powered CJ since last Friday. I do not understand where to measure the angle. I tried 1000mm from the prop oil supply tube and I tried 8” from the blade tip. What is correct? I am curious if the governor is set incorrectly.

Phil


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wlannon(at)shaw.ca
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PostPosted: Thu Jul 05, 2018 9:46 pm    Post subject: CJ Prop Blade Angle Procedure Reply with quote

Hi Phil;

1000 mm from the C/L is correct but if you just want to check that the
blades are correctly set check the scribe mark and the scale at the blade
grip. The scribe mark should be at the center mark. If they both look the
same and you have no issues with vibration, etc. sit down and have a beer or
two.

If you suspect a governor issue run through the governor setting procedure
in the manual and make sure there are no loose control system bolts or
clamps etc. allowing the cable housing to move.

Cheers;
Walt

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PS



Joined: 08 Sep 2006
Posts: 84
Location: Texas

PostPosted: Fri Jul 06, 2018 3:54 am    Post subject: Re: CJ Prop Blade Angle Procedure Reply with quote

Hello Walt,

Thank you for the reply.

I used 16 deg at 1000mm and I will check the scribe marks. I will fly when able to see how my settings affect the engine rpm.

Something I noticed, maybe normal, the prop without the oil dome reservoir goes well beyond the 31.5 degree max. Is that normal?

I assume the max bladed angles are measured with the oil dome installed. Is there a prop manual I can reference? My books did not come with one.

Phil


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PostPosted: Fri Jul 06, 2018 9:34 am    Post subject: CJ Prop Blade Angle Procedure Reply with quote

Hi Phil;

16 Deg. +/- 10 Min. is the correct setting for the low pitch angle so,
assuming that had not been disturbed earlier, you will see absolutely no
change in engine RPM.

What you may see is an increase in engine roughness if there is now any
difference between the two blade angles. What did you measure the blade
angles with?

The high pitch stop is integral with the pitch change piston (the ring held
in place by two cotter pins).

What torque did you use for the blade retaining bolts? These are referred
to as the "Jesus" bolts for a very good reason.

Yes, there is a manual. It is the PT6 Component Overhaul Manual. Doug
stocks it.

Walt

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PS



Joined: 08 Sep 2006
Posts: 84
Location: Texas

PostPosted: Fri Jul 06, 2018 12:50 pm    Post subject: Re: CJ Prop Blade Angle Procedure Reply with quote

I refinished my hub and blades recently, so I loosened the clamps. There was also vibration I had hoped to eliminate or lessen.

I have a digital level I used successfully on my Yaks.

I use 55 ft lbs and tighten to align for the cotter pin.

I found a prop manual while digging thru my pile, by PZL which came with one of my past Yaks. I will contact Doug next week for his manual.

I will run the CJ Sunday to see where I am. My concern is someone overseas, adjusted the governor to the incorrect blade angle. I read the procedure for proper setup in my PZL manual.

Phil


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PostPosted: Sun Jul 08, 2018 9:05 pm    Post subject: CJ Prop Blade Angle Procedure Reply with quote

Hi Phil;

If you loosened the clamps you should also have removed the blades for
cleaning and inspection of the blade and grip threads for evidence of
corrosion, etc. and inspection or replacement of the grease seals.
If all well re-coat all thread areas with Aeroshell #5 grease but prior to
blade installation remove all traces of grease in the clamping areas of the
blade and the grip for obvious reasons.
Inspect the clamping bolts for evidence of corrosion. If any exists that
cannot be removed with 400 Wet-or-Dry bolt replacement would be in order.
After cleaning up any "minor" corrosion the bolt (and nut) should be sent
for FMPI (Fluorescent Magnetic Particle Inspection).
Corrosion is a problem here partly because the Chinese plating is
questionable (I believe they use Zinc rather than Cadmium to comply with
current international standards which prohibit cadmium EXCEPT for Western
aviation use) and they don't add any additional protection like primer and
grease which I highly recommend.

Torque limits are the same whether Chinese, Russian or Polish at 57 to 65
ft/lb. None mention whether the torque process should be dry or lubed
threads. Being a Pratt & Whitney and Hamilton Standard type I use lubed.
Your process, from 55 to cotter pin is good but at times it is necessary to
use a different nut to avoid exceeding 65 ft/lb and of course this is a very
special nut.

Loss of this bolt in flight is terminal- chute or no chute- Blade goes to
flat pitch, counterweight assy. departs, engine mount fails, engine leaves
followed by the wing.

Blade angle setting, in my occasionally humble opinion, can only be done
satisfactorily with a precision propeller protractor. The low pitch angle
tolerance for the CJ prop. is an overly generous +/- 10 minutes compared to
0.1 Deg, ( 6 min) for HS and other types.
Using the proper equipment I can and do guarantee a setting within +/- 0.05
deg. or 3 minutes and a differential between blades of zero.

The tool is available from ATS new at $1700.00 but used ones are often
offered on Ebay at far less.

Walt
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PostPosted: Sun Jul 08, 2018 9:37 pm    Post subject: CJ Prop Blade Angle Procedure Reply with quote

Just noticed I lied! Proof read before send????? where have I heard that
before?

I wrote "Blade angle setting can only be done satisfactorily with a
precision propeller protractor" I should have added "when the propeller is
attached to an engine and aircraft". Propeller shops have standard equipment
for that function on the bench.

Walt
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PostPosted: Sun Jul 08, 2018 10:05 pm    Post subject: CJ Prop Blade Angle Procedure Reply with quote

Does anyone know what size circuit breaker is used for pitot heat on the Yaks?Thank you!
On Mon, Jul 9, 2018 at 12:09 AM Walter Lannon <wlannon(at)shaw.ca (wlannon(at)shaw.ca)> wrote:

[quote]--> Yak-List message posted by: "Walter Lannon" <wlannon(at)shaw.ca (wlannon(at)shaw.ca)>

Hi Phil;

If you loosened the clamps you should also have removed the blades for
cleaning and inspection of the blade and grip threads for evidence of
corrosion, etc. and inspection or replacement of the grease seals.
If all well re-coat all thread areas with Aeroshell #5 grease but prior to
blade installation remove all traces of grease in the clamping areas of the
blade and the grip for obvious reasons.
Inspect the clamping bolts for evidence of corrosion.  If any exists that
cannot be removed with 400 Wet-or-Dry bolt replacement would be in order.
After cleaning up any "minor" corrosion the bolt (and nut) should be sent
for FMPI (Fluorescent Magnetic Particle Inspection).
Corrosion is a problem here partly because the Chinese plating is
questionable (I believe they use Zinc rather than Cadmium to comply with
current international standards which prohibit cadmium EXCEPT for Western
aviation use) and they don't add any additional protection like primer and
grease which I highly recommend.

Torque limits are the same whether Chinese, Russian or Polish at 57 to 65
ft/lb.  None mention whether the torque process should be dry or lubed
threads. Being a Pratt & Whitney and Hamilton Standard type I use lubed.
Your process, from 55 to cotter pin is good but at times it is necessary to
use a different nut to avoid exceeding 65 ft/lb and of course this is a very
special nut.

Loss of this bolt in flight is terminal- chute or no chute- Blade goes to
flat pitch,  counterweight assy. departs, engine mount fails, engine leaves
followed by the wing.

Blade angle setting, in my occasionally humble opinion, can only be done
satisfactorily with a precision propeller protractor.  The low pitch angle
tolerance for the CJ prop. is an overly generous +/- 10 minutes compared to
0.1 Deg, ( 6 min) for HS and other types.
Using the proper equipment I can and do guarantee a setting within +/- 0.05
deg. or 3 minutes and a differential between blades of zero.

The tool is available from ATS new at $1700.00 but used ones are often
offered on Ebay at far less.

Walt


--


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