We've been running an Arrowind 3526-05 KV=685 on 6s rear mounted in a Brodak ARF Strega for a couple years. It has been a very reliable and powerfull system. Recently Dennis asked me to fly the new 13x5.5 WEP APC prop. The testing went well but I noticed before the testing began that the motor bearings were getting a little sloppy so after I finished the tests I felt the motor deserved a little tlc. I pulled it down and found that the rear bearing seemed like the source of the "slop". The 3526 has a single 11x5x5 (od, id, width) ball bearing in each end of the motor. While I was at the Boca site picking out a new 11x5x5 I got a call from Dennis and we started talking about adding a second bearing to the rear of the motor. After some spec sheet prospecting I decided that the second bearing didn't need to be the same size as the current one so I picked out a 8x5x2.5. If it doesn't work out I still have stock to play with. The next try would be a pair of 12x5x3's. Anyway, I did it today and ran back to back static draw runs with 4 different props to make myself comfortable that I got the new one concentric with the old ones. The draw was identical at all points so it's time to fly. Here are a couple pics. Note the "shroud of Northville" to keep the chips out of the electrical bits. I turned an arbor to hold the housing.
Topic: Motor work (Read 690 times)