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Throttle Operation

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hgmckay

Joined: 23 May 2006
Posts: 397

Posted: Tue Nov 17, 2015 12:34 pm Post subject: Throttle Operation

I have an Allegro 2000 using a Rotax 912 UL engine with 725 hours  operation. I am now finding that while flying the airplane the throttle lever  return springs (i.e. the springs that are connected to the throttle lever on the  carburetors on the engine is pulling my throttle towards the open position. In  other words I have to constantly hold the throttle control in the cockpit to  keep it from migrating towards the full open position. I understand why there is  a spring on the carbs. It is to pull the carbs to full open position in case of  a throttle cable break. But in my case, if I am flying and take my hand off the  Allegro cockpit throttle control, the springs on both carbs will pull the  throttle further in the open position. 

  

 I have never had this problem before. It appears that after 700+ hours of  operation there is not enough frictional resistance in the throttle cable  sheaths to hold the cable in position, or there is not enough frictional  resistance in the mechanical throttle arrangement on the Allegro 2000 to hold a  set throttle position. Has any one had this problem with the Allegro 2000, 912  UL engine arrangement? Comments and suggestions would be appreciated.

  

 Hugh G.  McKay III, P.E. Fellow, L.M. ASCE

Senior Consultant

Worldwide Engineering  Inc.

4090 North NC Hwy. 16

Denver, NC 28037

 Allegro  2000, Rotax 912 UL Engine, 725 hours



Ph. 704-661-8271

Fax  704-483-5466

email  hgmckay(at)bellsouth.net

http://www.wwegeo.com

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brad(at)vision-technology
Guest

Posted: Tue Nov 17, 2015 12:40 pm Post subject: Throttle Operation

Hi Hugh,

On the rod that connects the throttle handles to each other there is a nylon bushing (between the seats). The metal cap that holds that bushing down may be loose or the bushing is cracked.  (mine is cracked and I haven't searched for a replacement yet, but I was able to get plenty of friction by just tightening the bolts a bit).

Brad Kramer

N221FA - Mandan ND 

 [quote]--

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hgmckay

Joined: 23 May 2006
Posts: 397

Posted: Tue Nov 17, 2015 1:06 pm Post subject: Throttle Operation

Thanks Brad. I will check this bushing to see if that is the problem.

  

 Hugh G.  McKay III, P.E. Fellow, L.M. ASCE

Senior Consultant

Worldwide Engineering  Inc.

4090 North NC Hwy. 16

Denver, NC 28037



Ph. 704-661-8271

Fax  704-483-5466

email hgmckay(at)bellsouth.net

http://www.wwegeo.com

    

  From: brad(at)vision-technology.com (brad(at)vision-technology.com) 

 Sent: Tuesday, November 17, 2015 3:40 PM

 To: allegro-list(at)matronics.com (allegro-list(at)matronics.com) 

 Subject: Re: Throttle Operation

  



  

  

Hi Hugh, 

On the rod that connects the throttle handles to each other  there is a nylon bushing (between the seats). The metal cap that holds that  bushing down may be loose or the bushing is cracked.  (mine is cracked and  I haven't searched for a replacement yet, but I was able to get plenty of  friction by just tightening the bolts a bit). 

Brad Kramer 

N221FA - Mandan ND  

 [quote]--

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brad(at)vision-technology
Guest

Posted: Tue Nov 17, 2015 1:17 pm Post subject: Throttle Operation

If you happen to find a source / part # let me know.  I'd think it is a common part.

thanks



 

 [quote]--

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hgmckay

Joined: 23 May 2006
Posts: 397

Posted: Tue Nov 17, 2015 3:59 pm Post subject: Throttle Operation

Will do.

  

 Hugh G.  McKay III, P.E. Fellow, L.M. ASCE

Senior Consultant

Worldwide Engineering  Inc.

4090 North NC Hwy. 16

Denver, NC 28037



Ph. 704-661-8271

Fax  704-483-5466

email hgmckay(at)bellsouth.net

http://www.wwegeo.com

    

  From: brad(at)vision-technology.com (brad(at)vision-technology.com) 

 Sent: Tuesday, November 17, 2015 4:17 PM

 To: allegro-list(at)matronics.com (allegro-list(at)matronics.com) 

 Subject: Re: Throttle Operation

  



  

  

If you happen to find a source / part # let me know.  I'd  think it is a common part. 

thanks 

   

 [quote]--

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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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jkgcpa(at)ix.netcom.com
Guest

Posted: Tue Nov 17, 2015 4:37 pm Post subject: Throttle Operation

Hey Hugh,

 

Is the part available from Doug at Allegro?

 

Jerry Goldberg

N44456

Covey Trails (X09)

 

 

 

From: owner-allegro-list-server(at)matronics.com [mailto:owner-allegro-list-server(at)matronics.com] On Behalf Of Hugh McKay

Sent: Tuesday, November 17, 2015 5:59 PM

To: allegro-list(at)matronics.com

Subject: Re: Throttle Operation

 

Will do.



 



Hugh G. McKay III, P.E. Fellow, L.M. ASCE

Senior Consultant

Worldwide Engineering Inc.

4090 North NC Hwy. 16

Denver, NC 28037



Ph. 704-661-8271

Fax 704-483-5466

email hgmckay(at)bellsouth.net (hgmckay(at)bellsouth.net)

http://www.wwegeo.com



 



From: brad(at)vision-technology.com (brad(at)vision-technology.com) 



Sent: Tuesday, November 17, 2015 4:17 PM



To: allegro-list(at)matronics.com (allegro-list(at)matronics.com) 



Subject: Re: Throttle Operation



 

 

If you happen to find a source / part # let me know.  I'd think it is a common part.

thanks

 



 

[quote]

--

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doug(at)allegrolsa.com
Guest

Posted: Wed Nov 18, 2015 6:30 am Post subject: Throttle Operation

Jerry, Brad, and Hugh,

 Yes we do have the bushing available.  However, I do not think it is needed.  We have an Allegro at the flight school with over 5,000 hours and ONLY needed to occasionally tighten the friction bolts in the middle of the seats where the throttle rod goes through.  We mill these to our specs here at the factory.  If needed, they are $25.00 each plus shipping.  Again, I do not think anything more than tightening the friction lock is needed.  If you have questions, please feel free to call.  Also, please feel free to put this on the Allegro list.

 Thank you,

 Doug

  

 Douglas Hempstead

 LSA America, Inc.

 231 US Hwy 158 East

 Littleton, NC 27850

 252-586-1200

 www.allegrolsa.com

  

 [quote]-------

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