---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sun 03/02/14: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:36 PM - Re: B&C alternator conversion in Canada (milescrane) 2. 08:35 PM - Re: propeller pull through procedure (milescrane) 3. 11:03 PM - Re: Re: B&C alternator conversion in Canada (Jan Mevis) ________________________________ Message 1 _____________________________________ Time: 07:36:53 PM PST US Subject: Yak-List: Re: B&C alternator conversion in Canada From: "milescrane" We installed a B&C alternator on our Yak 55 (the one marketed for the Sukhoi) and did save about 25lb. This is the low output, permanent magnet type. It came with a solid state regulator and overvoltage protection. The weight saving came primarily from the removal of the generator, and also from the old carbon pile regulator and relay box. The positives so far are: improved power-to-weight ratio and aerobatic performance, and a smoothly operating charging system that works well even at low engine speeds. As for the negatives, we found that it was difficult and confusing to sort out the existing wiring in our -55, for which we could find no diagrams, although everyone we talked to said it was 'easy'. We routed the wires as much as possible with the existing bundles and removed wires which we identified as being non-functional. We traced one fault after the install to an original wire to a CB on the panel, that appeared intact but had failed internally- due to flexing, we think. The wiring turned out to be a greater challenge than it should have been. A few maintenance professionals were scratching their heads along with us. I would recommend conferring with Transport Canada M&M first. They will likely require documentation of all phases of the installation including the suitability of the physical mounting of the alternator and regulator, gauges and support of the wiring, etc. If we were not flying contest aerobatics, we would have left the generator in. Now that the alternator is in, we are happy with how it is performing. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=419687#419687 ________________________________ Message 2 _____________________________________ Time: 08:35:55 PM PST US Subject: Yak-List: Re: propeller pull through procedure From: "milescrane" Every piston travels fully with each rotation of the crank, as for a one cylinder engine. Two rotations complete a 'cycle'. To be sure all of them have completed every stage of the cycle, one additional turn would do it, but I agree that more turns are a good idea. Be careful if someone wants to help- they may not realize that this is not to be confused with a day at the gym! As others have indicated, damage is possible by hand. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=419692#419692 ________________________________ Message 3 _____________________________________ Time: 11:03:32 PM PST US Subject: Re: Yak-List: Re: B&C alternator conversion in Canada From: Jan Mevis I had the permanent magnet 10 amp B&C some years ago. One day, the overvoltage protection AND the regulator were severely damaged, because too large a current was drawn. I replaced it with the more robust 35 amp type. The 35 amp type is just slightly heavier than the 10 amp, but has a much better voltage regulating system. Jan On 03/03/14 04:36, "milescrane" wrote: > >We installed a B&C alternator on our Yak 55 (the one marketed for the >Sukhoi) and did save about 25lb. This is the low output, permanent >magnet type. >It came with a solid state regulator and overvoltage protection. The >weight saving came primarily from the removal of the generator, and also >from the old carbon pile regulator and relay box. > >The positives so far are: improved power-to-weight ratio and aerobatic >performance, and a smoothly operating charging system that works well >even at low engine speeds. > As for the negatives, we found that it was difficult and confusing to >sort out the existing wiring in our -55, for which we could find no >diagrams, although everyone we talked to said it was 'easy'. We routed >the wires as much as possible with the existing bundles and removed wires >which we identified as being non-functional. We traced one fault after >the install to an original wire to a CB on the panel, that appeared >intact but had failed internally- due to flexing, we think. >The wiring turned out to be a greater challenge than it should have been. >A few maintenance professionals were scratching their heads along with us. > >I would recommend conferring with Transport Canada M&M first. They will >likely require documentation of all phases of the installation including >the suitability of the physical mounting of the alternator and regulator, >gauges and support of the wiring, etc. > >If we were not flying contest aerobatics, we would have left the >generator in. Now that the alternator is in, we are happy with how it is >performing. > > >Read this topic online here: > >http://forums.matronics.com/viewtopic.php?p=419687#419687 > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-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/yak-list Browse Digests http://www.matronics.com/digest/yak-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.