Today's Message Index:
----------------------
1. 09:30 PM - Leaky carb (apatton2)
2. 10:05 PM - Re: Re: CJ Prop Blade Angle Procedure (Walter Lannon)
3. 10:37 PM - Re: Re: CJ Prop Blade Angle Procedure (Walter Lannon)
4. 11:05 PM - Re: Re: CJ Prop Blade Angle Procedure (John B)
Message 1
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Hi All,
I've noticed twice now that my carb (overhauled unit w/ ~50 hrs on it) will leak
gas after I land and refuel.
More detail:
It seems to leak through the throat of the carb
It drips once every 3-5 sec
I only have noticed it immediately post-fueling (perhaps it was dripping after
shutdown, but I didn't notice)
Today I think it dripped for around 45min after fueling. Weird.
Any thoughts on what could be responsible? When the engine is running I would expect
all of this fuel to be sucked into the carb itself. Relative to the amount
of fuel an M14 uses this should be trivial.
Many thanks,
Andrew
--------
Andrew Patton
Yak-50
San Francisco, CA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481500#481500
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| Subject: | Re: CJ Prop Blade Angle Procedure |
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
-----Original Message-----
From: PS
Sent: Friday, July 06, 2018 1:50 PM
Subject: Yak-List: Re: CJ Prop Blade Angle Procedure
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
--------
Phil
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481445#481445
---
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Message 3
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| Subject: | Re: CJ Prop Blade Angle Procedure |
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
-----Original Message-----
From: Walter Lannon
Sent: Sunday, July 08, 2018 10:05 PM
Subject: Re: Yak-List: Re: CJ Prop Blade Angle Procedure
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
-----Original Message-----
From: PS
Sent: Friday, July 06, 2018 1:50 PM
Subject: Yak-List: Re: CJ Prop Blade Angle Procedure
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
--------
Phil
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481445#481445
---
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Message 4
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| Subject: | Re: CJ Prop Blade Angle Procedure |
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@shaw.ca> wrote:
>
> 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
>
>
> -----Original Message-----
> From: PS
> Sent: Friday, July 06, 2018 1:50 PM
> To: yak-list@matronics.com
> Subject: Yak-List: Re: CJ Prop Blade Angle Procedure
>
>
> 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
>
> --------
> Phil
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=481445#481445
>
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
>
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