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Throttle Operation

 
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hgmckay



Joined: 23 May 2006
Posts: 397

PostPosted: Tue Nov 17, 2015 12:34 pm    Post subject: Throttle Operation Reply with quote

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
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PostPosted: Tue Nov 17, 2015 12:40 pm    Post subject: Throttle Operation Reply with quote

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

PostPosted: Tue Nov 17, 2015 1:06 pm    Post subject: Throttle Operation Reply with quote

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
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PostPosted: Tue Nov 17, 2015 1:17 pm    Post subject: Throttle Operation Reply with quote

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

PostPosted: Tue Nov 17, 2015 3:59 pm    Post subject: Throttle Operation Reply with quote

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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jkgcpa(at)ix.netcom.com
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PostPosted: Tue Nov 17, 2015 4:37 pm    Post subject: Throttle Operation Reply with quote

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
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PostPosted: Wed Nov 18, 2015 6:30 am    Post subject: Throttle Operation Reply with quote

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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