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propeller torque

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frans(at)paardnatuurlijk.
Guest

Posted: Thu Apr 16, 2009 12:07 pm Post subject: propeller torque

All,



Today I received my Woodcomp propeller. According to the manual I should

torque the bolts with 22Nm.

However, because of the location of the bolts, it is impossible to get

there with a normal torque wrench.

Is there a special tool I'm not aware off? Or do people practice

torqueing with 22Nm with a torque wrench as reference, and once mastered

the feel, apply it to the propeller bolts? Or is it just not critical at

all and is anything between hand-tight and applying brute force acceptable?



BTW, the propeller appears to be of good quality, there is a mechanical

end-stop indeed, and there are two limit switches *in series*.



-- 

Frans Veldman

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Ivor Phillips

Joined: 16 Jan 2006
Posts: 253
Location: London UK

Posted: Thu Apr 16, 2009 11:33 pm Post subject: propeller torque

Hi Fran

I purchased A Snap on tool made for the job,

http://buy1.snapon.com/catalog/item.asp?P65=&tool=all&item_ID 224&group_ID 69&store=uk&dir=catalog

Not the cheapest solution but against a prop being loose no contest,

regards

Ivor

---- Frans Veldman <frans(at)paardnatuurlijk.nl> wrote: 

 	  Quote: 	
		   

 

 All,

 

 Today I received my Woodcomp propeller. According to the manual I should

 torque the bolts with 22Nm.

 However, because of the location of the bolts, it is impossible to get

 there with a normal torque wrench.

 Is there a special tool I'm not aware off? Or do people practice

 torqueing with 22Nm with a torque wrench as reference, and once mastered

 the feel, apply it to the propeller bolts? Or is it just not critical at

 all and is anything between hand-tight and applying brute force acceptable?

 

 BTW, the propeller appears to be of good quality, there is a mechanical

 end-stop indeed, and there are two limit switches *in series*.

 

 -- 

 Frans Veldman

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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frans(at)paardnatuurlijk.
Guest

Posted: Fri Apr 17, 2009 2:48 am Post subject: propeller torque

Carl Pattinson wrote:



 	  Quote: 	
		   Whilst I can see how the device works it occurrs to me that increasing

 the distance of the torque measuring device from the bolt centre will

 affect the actual torque applied to the bolt head. Surely there has to

 be an adjustment in the setting to compensate for this.


	


You are right. You have to apply a conversion factor here. On the

internet, I even found a few online calculators for this purpose

(although the math is trivial).



How did you torque the propeller?



-- 

Frans Veldman

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ptag.dev(at)tiscali.co.uk
Guest

Posted: Fri Apr 17, 2009 2:48 am Post subject: propeller torque

Hi! Carl

You need to apply the torque 90 deg to the end of the spanner to have

the load be real time torque quoted on your tool.

Regards

Bob Harrison G-PTAG



--

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kheindl(at)msn.com
Guest

Posted: Fri Apr 17, 2009 4:20 am Post subject: propeller torque

  

Frans C we had the same thread about 2 years ago. Special tools (I was silly enough to buy one) C and recalculatind torque is a waste of time C if you do as Bob says. The force exerted by your arm is less C but the torque applied at the nut is unchanged.

  

 Karl

 



  

[quote] From: ptag.dev(at)tiscali.co.uk

 To: europa-list(at)matronics.com

 Subject: RE: Re: propeller torque

 Date: Fri C 17 Apr 2009 11:44:48 +0100

 

 --> Europa-List message posted by: "Robert C Harrison" <ptag.dev(at)tiscali.co.uk>

 

 Hi! Carl

 You need to apply the torque 90 deg to the end of the spanner to have

 the load be real time torque quoted on your tool.

 Regards

 Bob Harrison G-PTAG

 

 --

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Rowland_Carson

Joined: 04 Jul 2008
Posts: 155
Location: Cheltenham, England

Posted: Fri Apr 17, 2009 6:17 am Post subject: propeller torque

At 2009-04-17 11:06 +0100 Carl Pattinson wrote:



 	  Quote: 	
		  Whilst I can see how the device works it occurrs to me that 

increasing the distance of the torque measuring device from the bolt 

centre will affect the actual torque applied to the bolt head. 

Surely there has to be an adjustment in the setting to compensate 

for this.



Unless I am much mistaken, the longer the adapter arm, the less 

force will be needed to make the torque wrench click (you know what 

I mean). If the torque wrench is set to the reccommended setting, 

the likelyhood is that the bolt will be over tightened or even 

possibly stripped.



PS: I have said bolts when I mean nuts.



Perhaps someone can point out the error of my thinking.


	


Carl - we had a similar discussion in September 2006, during which I 

had exactly the same visualisation problem as you, until ....



At 2006-09-08 20:34 +0100 Rowland Carson wrote:



 	  Quote: 	
		  Consider (as they say in all the best textbooks) a virtual lever 

going diagonally from the handle end of the torque wrench to the 

centre of the prop bolt. This will be longer than the actual torque 

wrench, but the component of force effective at right angles to its 

axis will be smaller than the force exerted by the operator, in the 

exact proportion required to apply the required torque to the prop 

bolt.



All I had to do was remember that the torque-wrench & spanner 

assembly is a rigid body (at least until the torque wrench clicks) 

and sketch the components of the operator force. Sorry to be so slow 

on the uptake


	


Does that help?



regards



Rowland

-- 

| Rowland Carson    http://home.clara.net/rowil/

| <rowil(at)clara.net>          ... that's Rowland with a 'w' ...

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sidsel.svein(at)oslo.onli
Guest

Posted: Fri Apr 17, 2009 9:53 am Post subject: propeller torque

Actually, the torque wrench may be at any angle to the spanner - it "clicks"

only when the bending moment at the end (= torque) reaches the set point.

The bending moment transferred to the spanner (ref. my sketch yesterday) is

then equal to that set point.  The important point is that the force applied

by your hand at the torque wrench handle MUST ALWAYS BE PARALLELL TO THE

SPANNER, ALSO IF THE TWO TOOLS ARE AT 90 DEGREES.  If not, your force causes

an additional bending moment in the spanner and thus an additional torque on

the prop bolt.  The reason for recommending (and drawing) the spanner and

the torque wrench at 90 degrees angle is that the natural direction of your

hand's force on the handle is also 90 degrees, i.e. less risk that you

forget to apply the force parallel to the spanner.



If the torque wrench is not 90 degrees to the spanner, more force (PARALLEL

TO THE SPANNER!) must be applied to the torque wrench to reach the set

point, but the torque at the prop bolt is still equal to the set point when

the torque wrench "clicks".



Regards,

Svein



-----Opprinnelig melding-----

Fra: owner-europa-list-server(at)matronics.com

[mailto:owner-europa-list-server(at)matronics.com] På vegne av Robert C

Harrison

Sendt: 17. april 2009 12:45

Til: europa-list(at)matronics.com

Emne: RE: Re: propeller torque




<ptag.dev(at)tiscali.co.uk>



Hi! Carl

You need to apply the torque 90 deg to the end of the spanner to have

the load be real time torque quoted on your tool.

Regards

Bob Harrison G-PTAG

- The Matronics Europa-List Email Forum -

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sidsel.svein(at)oslo.onli
Guest

Posted: Sat Apr 18, 2009 2:14 am Post subject: propeller torque

One wrong statement in my posting yesterday:  If the force is not parallel

to the spanner, the torque on the bolt is not necessarily increased above

the torque wrench set point - it may decrease, depending on the direction of

the force. If the force is directed inwards toward the spanner/bolt, the

torque on the bolt is less than the set point when it clicks.  If directed

outwards, the torque is higher.  So, just keep it parallel to the spanner!



Regards,

Svein



-----Opprinnelig melding-----

Fra: owner-europa-list-server(at)matronics.com

[mailto:owner-europa-list-server(at)matronics.com] På vegne av Sidsel & Svein

Johnsen

Sendt: 17. april 2009 19:53

Til: europa-list(at)matronics.com

Emne: RE: Re: propeller torque




<sidsel.svein(at)oslo.online.no>



Actually, the torque wrench may be at any angle to the spanner - it "clicks"

only when the bending moment at the end (= torque) reaches the set point.

The bending moment transferred to the spanner (ref. my sketch yesterday) is

then equal to that set point.  The important point is that the force applied

by your hand at the torque wrench handle MUST ALWAYS BE PARALLELL TO THE

SPANNER, ALSO IF THE TWO TOOLS ARE AT 90 DEGREES.  If not, your force causes

an additional bending moment in the spanner and thus an additional torque on

the prop bolt.  The reason for recommending (and drawing) the spanner and

the torque wrench at 90 degrees angle is that the natural direction of your

hand's force on the handle is also 90 degrees, i.e. less risk that you

forget to apply the force parallel to the spanner.



If the torque wrench is not 90 degrees to the spanner, more force (PARALLEL

TO THE SPANNER!) must be applied to the torque wrench to reach the set

point, but the torque at the prop bolt is still equal to the set point when

the torque wrench "clicks".



Regards,

Svein

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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