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torque settings to lock blades

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wise(at)txc.net.au
Guest

Posted: Sat Jul 24, 2010 4:15 pm Post subject: torque settings to lock blades

G'Day All,

  

 Can someone please verify the torque setting to  tighten the nuts that lock the blades to the hub?

  

 Thanks and cheers,

 Chris.

  

   [quote][b]

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wlannon(at)persona.ca
Guest

Posted: Sat Jul 24, 2010 4:44 pm Post subject: torque settings to lock blades

Chris;

  

 If you are referring to the counterweight clamp  bolts that lock the blades to the sleeve that is already installed in the hub it  is 8 Kgf/m or 57 to 60 Lb Ft.

 This would apply to both the J9G1 (CJ) and the  V530.

  

 Make sure the c'weight clamp is in positive contact  with the sleeve flange before securing.

  

 If you are referring to the blade bearing retaining  nuts please advise.

  

 Walt 

 [quote]   ---

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wise(at)txc.net.au
Guest

Posted: Sat Jul 24, 2010 5:14 pm Post subject: torque settings to lock blades

G'Day Walt,

  

 I understood that it was 60 ft lb, but was  yesterday informed that I was wrong and that the torque setting was 75 which  I suspected was to high.

  

 Cheers,

 Chris.

  

 [quote]   ---

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flyayak

Joined: 17 Jul 2010
Posts: 7

Posted: Mon Feb 21, 2011 3:45 am Post subject: Re: torque settings to lock blades

Hi all,



sorry, but now I´m a bit confused. Is it 60 or 75 lb/ft (the last one seems really a bit high)?

And by the way, the 6 nuts behind the prop flange should be tightened with 87 ft/lbs, right?



Thanks a lot.



Stefan

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radiopicture

Joined: 23 Jun 2008
Posts: 263

Posted: Mon Feb 21, 2011 4:25 am Post subject: torque settings to lock blades

87 is fine for the prop flange. be sure to use the proper calculation if you're using a dogbone extension, which you pretty much have to. Here's a calculator on the internet:



http://www.belknaptools.com/extcalc.asp



Looking around for the counterweight figure, and it is tight, but not that tight as I recall (more like 40). Plus, it's a castle nut, so you don't get it right on (could be up to 30 degrees to the closest increment). I'll post it if I can find it. 

On Feb 21, 2011, at 6:45 AM, flyayak wrote:



 	  Quote: 	
		   

 

 Hi all,

 

 sorry, but now I´m a bit confused. Is it 60 or 75 lb/ft (the last one seems really a bit high)?

 And by the way, the 6 nuts behind the prop flange should be tightened with 87 ft/lbs, right?

 

 Thanks a lot.

 

 Stefan

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=331696#331696

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dsavarese0812(at)bellsout
Guest

Posted: Mon Feb 21, 2011 5:54 am Post subject: torque settings to lock blades

Yes, the torque spec I have for the prop flange nuts (22mm) is 87 ft/lbs.

Dennis



On 2/21/2011 5:45 AM, flyayak wrote:

 	  Quote: 	
		   



 Hi all,



 sorry, but now I´m a bit confused. Is it 60 or 75 lb/ft (the last one seems really a bit high)?

 And by the way, the 6 nuts behind the prop flange should be tightened with 87 ft/lbs, right?



 Thanks a lot.



 Stefan





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=331696#331696

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wlannon(at)persona.ca
Guest

Posted: Mon Feb 21, 2011 10:04 am Post subject: torque settings to lock blades

Blade clamp (c'weight bracket) bolt/nut torque value is 57 to 63 lb/ft.



Torque to approx 55 lb/ft then to next cotter pin hole if within torque 

limit.  Torque values given for castelated  nuts USUALLY allow for further 

tighening to line up the next hole. BUT-------

Whether that is true of Russian/Chinese specs. I don't know!  I would allow 

only a very smal overtorque.l



Having the advantage of a few spare nuts I can usually get away with 

selective fitting.  When that fails I guage the amount of turn required 

relative to the thread pitch and machine the nut base accordingly.



This is arguably the MOST CRITICAL torque value on the entire 

engine/airframe combination.



Walt.



Walt

---

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flyayak

Joined: 17 Jul 2010
Posts: 7

Posted: Tue Feb 22, 2011 3:15 am Post subject: Re: torque settings to lock blades

Thanks a lot, for this very useful information.

Stefan

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