---------------------------------------------------------- Allegro-List Digest Archive --- Total Messages Posted Tue 04/22/08: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:20 AM - Re:nose gear shimmy (Thom Riddle) 2. 06:33 AM - Re: Re:nose gear shimmy (Hugh) ________________________________ Message 1 _____________________________________ Time: 04:20:45 AM PST US From: Thom Riddle Subject: Allegro-List: re:nose gear shimmy Hugh, It sounds like you've paid your dues on the drawbar. When I inspected the nose gear after the shimmy developed the only place I saw any relative movement was between the drawbar bearing and the nose gear tube. I"ll inspect more carefully all the drawbar connection points to confirm there is none there too. I can see how the drawbar is installed/removed. My question was about removing the drawbar bearing, not the drawbar itself. Unless I discover relative motion elsewhere it appears that the sleeve bearing material, which appears to be made of nylon, Delrin, UHMW or something of the sort, has worn out. If that is the case, which seems likely, then replacing that bearing or at least the sleeve material should resolve the problem. I will take you up on your offer of faxing me what you have. My fax number is (425) 920-8010. I'd like to see if what you have is the same as what is in the PDF file of the assembly manual that B Bar D finally sent me a couple years ago after begging them for more useful information. I've still not heard back from them on my request for price and delivery of the bearing so I'll call them. If you don't have the PDF file (only paper copy?) and would like it, let me know and I'll send it to you. I also strong armed them into giving me their spreadsheet file with part numbers. If you don't have that and want it, let me know. There is now a second Allegro in western New York, about 65 air miles south of me. He bought it from the first owner who had very little time in type when he broke it during a hot landing without flaps. Apparently he had not learned how good a glider the Allegro is and couldn't get it to come down so he forced it on, nose wheel first. The pilot was not injured but the airplane had major structural damage, including fuselage, main gear, nose gear and firewall, and prop. He hauled the fuselage to a composite expert in New Mexico and had it all repaired. I saw the airplane last weekend and it looked brand new, inside and out. That composite guy in New Mexico really knows his stuff. Now the current owner is waiting (still) for a new nose wheel from B Bar D, which broke during the accident last year. It has been inspected and is ready to fly again except for the wheel. Thom in Buffalo ________________________________ Message 2 _____________________________________ Time: 06:33:10 AM PST US From: "Hugh" Subject: RE: Allegro-List: re:nose gear shimmy Thom: Sorry I did not clearly understand your email. I may still not understand the item in question. Are you talking about the small swivel bearing that is pressed in the back end of the draw bar, or are you talking about the large nylon (?) sleeve bushing that is on the front gear aluminum pipe which attaches to the front end of the draw bar? If it is the small swivel bearing, I believe it is pressed in the back end piece of the draw bar. If it is the large nylon (?) bushing, it can easily be replaced. I will fax you the two sheets from my assembly manual. The quality of the two sketches and the numbering system was not very clear, so I have marked the numbers in a clearer manner. If you have any questions email or call me at 704-483-9509 (home), or 704-661-8271 (cell). Yes, I would like a copy of your pdf file for the assembly manual, and parts list spread sheet. I only have one paper copy of the assembly manual. Even though I have numerous notes and additional hand written information on my paper copy, if it ever was lost I would at least have a back up pdf of the manual itself. I'll fax the two sheets today. Hugh -----Original Message----- From: owner-allegro-list-server@matronics.com [mailto:owner-allegro-list-server@matronics.com] On Behalf Of Thom Riddle Sent: Tuesday, April 22, 2008 7:15 AM Subject: Allegro-List: re:nose gear shimmy Hugh, It sounds like you've paid your dues on the drawbar. When I inspected the nose gear after the shimmy developed the only place I saw any relative movement was between the drawbar bearing and the nose gear tube. I"ll inspect more carefully all the drawbar connection points to confirm there is none there too. I can see how the drawbar is installed/removed. My question was about removing the drawbar bearing, not the drawbar itself. Unless I discover relative motion elsewhere it appears that the sleeve bearing material, which appears to be made of nylon, Delrin, UHMW or something of the sort, has worn out. If that is the case, which seems likely, then replacing that bearing or at least the sleeve material should resolve the problem. I will take you up on your offer of faxing me what you have. My fax number is (425) 920-8010. I'd like to see if what you have is the same as what is in the PDF file of the assembly manual that B Bar D finally sent me a couple years ago after begging them for more useful information. I've still not heard back from them on my request for price and delivery of the bearing so I'll call them. If you don't have the PDF file (only paper copy?) and would like it, let me know and I'll send it to you. I also strong armed them into giving me their spreadsheet file with part numbers. If you don't have that and want it, let me know. There is now a second Allegro in western New York, about 65 air miles south of me. He bought it from the first owner who had very little time in type when he broke it during a hot landing without flaps. Apparently he had not learned how good a glider the Allegro is and couldn't get it to come down so he forced it on, nose wheel first. The pilot was not injured but the airplane had major structural damage, including fuselage, main gear, nose gear and firewall, and prop. He hauled the fuselage to a composite expert in New Mexico and had it all repaired. I saw the airplane last weekend and it looked brand new, inside and out. That composite guy in New Mexico really knows his stuff. Now the current owner is waiting (still) for a new nose wheel from B Bar D, which broke during the accident last year. It has been inspected and is ready to fly again except for the wheel. Thom in Buffalo ------------------------------------------------------------------------------------- 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.