---------------------------------------------------------- Allegro-List Digest Archive --- Total Messages Posted Tue 11/17/15: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:34 PM - Throttle Operation (Hugh McKay) 2. 12:41 PM - Re: Throttle Operation (brad@vision-technology.com) 3. 01:06 PM - Re: Throttle Operation (Hugh McKay) 4. 01:17 PM - Re: Throttle Operation (brad@vision-technology.com) 5. 03:59 PM - Re: Throttle Operation (Hugh McKay) 6. 04:37 PM - Re: Throttle Operation (Jerry Goldberg) ________________________________ Message 1 _____________________________________ Time: 12:34:58 PM PST US From: "Hugh McKay" Subject: Allegro-List: 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@bellsouth.net http://www.wwegeo.com ________________________________ Message 2 _____________________________________ Time: 12:41:00 PM PST US From: brad@vision-technology.com Subject: Re: Allegro-List: Throttle Operation Hi Hugh, On the rod that connects the throttle handles to each other there is a ny lon bushing (between the seats). The metal cap that holds that bushing do wn 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 -----Original Message----- From: Hugh McKay [mailto:hgmckay@bellsouth.net] Sent: Tuesday, November 17, 2015 02:34 PM Subject: Allegro-List: Throttle Operation I have an Allegro 2000 using a Rotax 912 UL engine with 725 hours operati on. I am now finding that while flying the airplane the throttle lever re turn springs (i.e. the springs that are connected to the throttle lever o n the carburetors on the engine is pulling my throttle towards the open p osition. 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, t he springs on both carbs will pull the throttle further in the open posit ion. I have never had this problem before. It appears that after 700+ hours of operation there is not enough frictional resistance in the throttle cabl e sheaths to hold the cable in position, or there is not enough frictiona l resistance in the mechanical throttle arrangement on the Allegro 2000 t o hold a set throttle position. Has any one had this problem with the All egro 2000, 912 UL engine arrangement? Comments and suggestions would be a ppreciated. 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@bellsouth.net http://www.wwegeo.com ________________________________ Message 3 _____________________________________ Time: 01:06:45 PM PST US From: "Hugh McKay" Subject: Re: Allegro-List: 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@bellsouth.net http://www.wwegeo.com From: brad@vision-technology.com Sent: Tuesday, November 17, 2015 3:40 PM Subject: Re: Allegro-List: 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 -----Original Message----- From: Hugh McKay [mailto:hgmckay@bellsouth.net] Sent: Tuesday, November 17, 2015 02:34 PM To: allegro-list@matronics.com Subject: Allegro-List: 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@bellsouth.net http://www.wwegeo.com ________________________________ Message 4 _____________________________________ Time: 01:17:33 PM PST US From: brad@vision-technology.com Subject: Re: Allegro-List: Throttle Operation If you happen to find a source / part # let me know. I'd think it is a co mmon part. thanks -----Original Message----- From: Hugh McKay [mailto:hgmckay@bellsouth.net] Sent: Tuesday, November 17, 2015 03:06 PM Subject: Re: Allegro-List: 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@bellsouth.net http://www.wwegeo.com From:brad@vision-technology.com Sent: Tuesday, November 17, 2015 3:40 PM To:allegro-list@matronics.com Subject: Re: Allegro-List: Throttle Operation Hi Hugh, On the rod that connects the throttle handles to each other there is a ny lon bushing (between the seats). The metal cap that holds that bushing do wn 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 -----Original Message----- From: Hugh McKay [mailto:hgmckay@bellsouth.net] Sent: Tuesday, November 17, 2015 02:34 PM Subject: Allegro-List: Throttle Operation I have an Allegro 2000 using a Rotax 912 UL engine with 725 hours operati on. I am now finding that while flying the airplane the throttle lever re turn springs (i.e. the springs that are connected to the throttle lever o n the carburetors on the engine is pulling my throttle towards the open p osition. 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, t he springs on both carbs will pull the throttle further in the open posit ion. I have never had this problem before. It appears that after 700+ hours of operation there is not enough frictional resistance in the throttle cabl e sheaths to hold the cable in position, or there is not enough frictiona l resistance in the mechanical throttle arrangement on the Allegro 2000 t o hold a set throttle position. Has any one had this problem with the All egro 2000, 912 UL engine arrangement? Comments and suggestions would be a ppreciated. 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@bellsouth.net http://www.wwegeo.com ________________________________ Message 5 _____________________________________ Time: 03:59:30 PM PST US From: "Hugh McKay" Subject: Re: Allegro-List: 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@bellsouth.net http://www.wwegeo.com From: brad@vision-technology.com Sent: Tuesday, November 17, 2015 4:17 PM Subject: Re: Allegro-List: Throttle Operation If you happen to find a source / part # let me know. I'd think it is a common part. thanks -----Original Message----- From: Hugh McKay [mailto:hgmckay@bellsouth.net] Sent: Tuesday, November 17, 2015 03:06 PM To: allegro-list@matronics.com Subject: Re: Allegro-List: 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@bellsouth.net http://www.wwegeo.com From: brad@vision-technology.com Sent: Tuesday, November 17, 2015 3:40 PM To: allegro-list@matronics.com Subject: Re: Allegro-List: 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 -----Original Message----- From: Hugh McKay [mailto:hgmckay@bellsouth.net] Sent: Tuesday, November 17, 2015 02:34 PM To: allegro-list@matronics.com Subject: Allegro-List: 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@bellsouth.net http://www.wwegeo.com ________________________________ Message 6 _____________________________________ Time: 04:37:01 PM PST US From: "Jerry Goldberg" Subject: RE: Allegro-List: Throttle Operation Hey Hugh, Is the part available from Doug at Allegro? Jerry Goldberg N44456 Covey Trails (X09) From: owner-allegro-list-server@matronics.com [mailto:owner-allegro-list-server@matronics.com] On Behalf Of Hugh McKay Sent: Tuesday, November 17, 2015 5:59 PM Subject: Re: Allegro-List: 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@bellsouth.net http://www.wwegeo.com From: brad@vision-technology.com Sent: Tuesday, November 17, 2015 4:17 PM Subject: Re: Allegro-List: Throttle Operation If you happen to find a source / part # let me know. I'd think it is a common part. thanks -----Original Message----- From: Hugh McKay [mailto:hgmckay@bellsouth.net] Sent: Tuesday, November 17, 2015 03:06 PM Subject: Re: Allegro-List: 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@bellsouth.net http://www.wwegeo.com From: brad@vision-technology.com Sent: Tuesday, November 17, 2015 3:40 PM Subject: Re: Allegro-List: 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 -----Original Message----- From: Hugh McKay [mailto:hgmckay@bellsouth.net] Sent: Tuesday, November 17, 2015 02:34 PM Subject: Allegro-List: 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@bellsouth.net http://www.wwegeo.com ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message allegro-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Allegro-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/allegro-list Browse Digests http://www.matronics.com/digest/allegro-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.