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http://www3.towerhobbies.com/cgi-bin...?&I=LXEBE6&P=7 http://www3.towerhobbies.com/cgi-bin...?&I=LXK225&P=7 A spinner this big needs both a front and rear centering piece. I used the stock spinner with a 3mm ply backing plate. Getting the backing plate perfectly circular AND balanced was a PITA. I also use a collet prop adaptor with a 5mm shaft. I used a GWS rubber spinner in the nose of the stock foam one... not sure if it was the one that came with the kit or not. I reamed it out so it would slide over an extension I put on the front of the collet. I used a Hyperion extra long collet so several threads were left in front of the nut. Then I force-threaded a small piece of hard nylon tubing on the threads to make a short extension which engages the rubber spinner I reamed out. That solved the front centering nicely. I then used Perfect Glue #1 to adhere the foam spinner to the ply backing plate. This glue sets up slowly so you can run the motor slowly to get the spinner centered pretty good. When the glue sets up, it stays flexible so you can slice through the bond with a razor blade if you have to take off the prop. Once the glue was fully cured, I ran the motor at higher speeds to check balance centering. If you're lucky, it still balances nicely. If not you need to true it up with a rasp or coarse sand paper until you can run at WOT without much vibration. Then paint it and HOPE it's still balanced after that. On my first attempt I paid more attention to getting it to spin true and less that it was also balanced. It vibrated at the nose about 3/16 in. at WOT, and although it sounded neat, it required more power to spin the prop (not to mention stressing the motor bearings) and noticably affected performance. When I got it balanced better, it quieted down and flew better. If you have to change a prop, you cut through the glue on the backing plate, remove the spinner, then do this ALL over again, so what was once a PITA is now a ROYAL PITA. If GWS reads this and has any empathy for us, they might at least include a rigid plastic spinner backing plate with a simple means of attaching and removing the foam piece. That's needed even if you use one of their motors with the long skinny shaft. |
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