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Ernie
Joined: 11 Jan 2006
Posts: 513
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 Posted: Thu Nov 20, 2014 5:58 pm Post subject: Prop nut torque |
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can someone give me a definitive answer for the torque value for the main prop nut for the Housai prop. I have gotten values ranging from 250 to 750 ft lbs. and can you provide the source, since I cannot find it in the manual. [quote][b]
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wlannon(at)shaw.ca
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| Posted: Thu Nov 20, 2014 7:18 pm Post subject: Prop nut torque |
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50 to 60 KGM or 370 to 430 lb/ft. It is in the Tech. Specs Manual, pg. 216. Of course it is also in the component overhaul manual which gives a much more detailed view of the propellor and many other parts of the aircraft. Doug has them.
Walt
From: Ernest Martinez (erniel29(at)gmail.com)
Sent: Thursday, November 20, 2014 5:58 PM
To: yak-list (yak-list(at)matronics.com)
Subject: Prop nut torque
can someone give me a definitive answer for the torque value for the main prop nut for the Housai prop. I have gotten values ranging from 250 to 750 ft lbs. and can you provide the source, since I cannot find it in the manual. [quote]
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[b]
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Ernie
Joined: 11 Jan 2006
Posts: 513
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| Posted: Thu Nov 20, 2014 7:47 pm Post subject: Prop nut torque |
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Thank you!
On Thursday, November 20, 2014, Walter Lannon <wlannon(at)shaw.ca (wlannon(at)shaw.ca)> wrote:
[quote] 50 to 60 KGM or 370 to 430 lb/ft. It is in the Tech. Specs Manual, pg. 216. Of course it is also in the component overhaul manual which gives a much more detailed view of the propellor and many other parts of the aircraft. Doug has them.
Walt
From: [url=javascript:_e(%7B%7D,'cvml','erniel29(at)gmail.com');]Ernest Martinez[/url]
Sent: Thursday, November 20, 2014 5:58 PM
To: [url=javascript:_e(%7B%7D,'cvml','yak-list(at)matronics.com');]yak-list[/url]
Subject: Prop nut torque
can someone give me a definitive answer for the torque value for the main prop nut for the Housai prop. I have gotten values ranging from 250 to 750 ft lbs. and can you provide the source, since I cannot find it in the manual.
[b]
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Ernie
Joined: 11 Jan 2006
Posts: 513
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| Posted: Fri Nov 21, 2014 5:45 am Post subject: Prop nut torque |
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Walt,
The first place I looked was in the overhaul manual. I can see all the other torque values but none for the main nut. I see one cryptic entry which doesnt specify a torque value per se' but states:
"Torque propellor housing nut to such extent that before installation of driving sleeve, rotation moment for each blade is 9.8 +- 2 N.M. during change from low pitch to high pitch. Ensure that torque difference between 2 nuts is not more than 2 N.M."
I interpret this to mean, torque the nut to the point that the force to manually change the pitch is no more than 9.8 NM. But what other 2 nuts are they talking about?
On Thu, Nov 20, 2014 at 10:46 PM, Ernest Martinez <erniel29(at)gmail.com (erniel29(at)gmail.com)> wrote:
[quote]Thank you!
On Thursday, November 20, 2014, Walter Lannon <wlannon(at)shaw.ca (wlannon(at)shaw.ca)> wrote:
| Quote: | 50 to 60 KGM or 370 to 430 lb/ft. It is in the Tech. Specs Manual, pg. 216. Of course it is also in the component overhaul manual which gives a much more detailed view of the propellor and many other parts of the aircraft. Doug has them.
Walt
From: Ernest Martinez
Sent: Thursday, November 20, 2014 5:58 PM
To: yak-list
Subject: Prop nut torque
can someone give me a definitive answer for the torque value for the main prop nut for the Housai prop. I have gotten values ranging from 250 to 750 ft lbs. and can you provide the source, since I cannot find it in the manual.
|
[b]
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wlannon(at)shaw.ca
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| Posted: Fri Nov 21, 2014 1:47 pm Post subject: Prop nut torque |
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Ernie;
I probably gave you a bum steer. It is after all an “overhaul” manual and that is an installation value.
I know it is in my copy but only because I probably put it in when I converted all those torque values to in/lb or ft lb. My apologies.
Can’t confirm any of that as the manual is in the hangar and I am home under the weather.
The other torque item you note is indeed the setting of the actual blade torque. Under normal circumstances it is an overhaul function only during hub assembly with the drive sleeve not installed. The drive sleeve is a rotational part in the hub that connects the blades to each other and to the pitch-change piston. The “nut” they refer to should be “nut’s” and may be better described as blade bearing nuts – the big nuts in each end of the hub. These are tightened until each blade turning torque (rotational moment) is within limit and the actual nut torque is within 2NM of each other.
At this point the nuts are metal stamped to line up with an index mark on the hub for future considerations, the prop is disassembled and reassembled with all parts in preparation for balancing.
Walt
From: Ernest Martinez (erniel29(at)gmail.com)
Sent: Friday, November 21, 2014 5:45 AM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: Prop nut torque
Walt,
The first place I looked was in the overhaul manual. I can see all the other torque values but none for the main nut. I see one cryptic entry which doesnt specify a torque value per se' but states:
"Torque propellor housing nut to such extent that before installation of driving sleeve, rotation moment for each blade is 9.8 +- 2 N.M. during change from low pitch to high pitch. Ensure that torque difference between 2 nuts is not more than 2 N.M."
I interpret this to mean, torque the nut to the point that the force to manually change the pitch is no more than 9.8 NM. But what other 2 nuts are they talking about?
On Thu, Nov 20, 2014 at 10:46 PM, Ernest Martinez <erniel29(at)gmail.com (erniel29(at)gmail.com)> wrote:
| Quote: | Thank you!
On Thursday, November 20, 2014, Walter Lannon <wlannon(at)shaw.ca (wlannon(at)shaw.ca)> wrote:
| Quote: | 50 to 60 KGM or 370 to 430 lb/ft. It is in the Tech. Specs Manual, pg. 216. Of course it is also in the component overhaul manual which gives a much more detailed view of the propellor and many other parts of the aircraft. Doug has them.
Walt
From: Ernest Martinez
Sent: Thursday, November 20, 2014 5:58 PM
To: yak-list
Subject: Prop nut torque
can someone give me a definitive answer for the torque value for the main prop nut for the Housai prop. I have gotten values ranging from 250 to 750 ft lbs. and can you provide the source, since I cannot find it in the manual.
|
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[quote]
href="http://www.aeroelectric.com">www.aeroelectric.com
href="http://www.buildersbooks.com">www.buildersbooks.com
href="http://www.homebuilthelp.com">www.homebuilthelp.com
href="http://www.mypilotstore.com">www.mypilotstore.com
href="http://www.mrrace.com">www.mrrace.com
href="http://www.matronics.com/contribution">http://www.matronics.com/chref="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List
href="http://forums.matronics.com">http://forums.matronics.com
[b]
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Vic
Joined: 12 Aug 2008
Posts: 115
Location: Southern Bavaria
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| Posted: Fri Nov 21, 2014 6:40 pm Post subject: Re: Prop nut torque |
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It puzzles me how one can issue torque numbers for the blades when the nuts only do one job, preload axial rollers. So I´d be a bit worried to overload those rollers heavily to achieve 10 Nm torque in a roller bearing that normally has very low friction. What could be the effect if this torque was only half or quart of the numbers, anybody an idea ? I only know the Russian hub.
Possibly the torque numbers could be another translation mistake when the decimal hit the wrong place ???
Vic
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wlannon(at)shaw.ca
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| Posted: Sat Nov 22, 2014 10:50 am Post subject: Prop nut torque |
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I would expect to see the same blade preload for the Russian hub as well.
10Nm (7.2 lb/Ft) is a very minimal preload compared to similar Hamilton
Standard props. (2D30,12D40, etc) which is 50 lb/ft. and thrust bearing
design is identical. I would hazard a guess that the reason for this
preload could be to overcome any non-axial blade loading transferred to the
bearing area.
Walt
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