Power Systems Talk about motors, ESC speed controllers, gear drives, propellers, power system simulators and all power system related topics

PZ gearbox Motor Question For poor Spitfire

Old 01-08-2008, 06:28 PM
  #1  
Crashly
Crashly
Thread Starter
 
Join Date: Jul 2007
Posts: 6
Default PZ gearbox Motor Question For poor Spitfire

Like many others, I have been experiencing spontaneous gearbox failures on my Spitfire. Average lifespan is about 5 flights. I run full throttle most of the time with the Lipo battery. I have come to the conclusion that the plastic motor housing is too tight a fit to allow expansion of the motor when hot and so stress cracks develop and eventually propagate till total failure or vibration occurs. This does not happen with the Supercub even though it has the same gearbox and motor but it has a smaller battery and therefore less heat. Have seen fixes based on strengthening the gearbox motor housing using the removable metal sleeve on the motor.ffice:office" /><O</O
<O</O
I thought I'd give it a try, then it occurred to me, "why not just leave the sleeve off all together and see what happens. So far after 10 flights all is good. My question is: What is that metal band for? <O</O
<O</O
Crashly is offline  
Old 01-09-2008, 03:44 PM
  #2  
soar-ne
Omaha Ne.
 
Join Date: Dec 2006
Posts: 363
Default

You must be talking about a "Flux Ring". These come with some motors, not a expert but I think the motor is a little more effecient with it on. On the old Johnson motors we took them off all the time with no effect. In our use where we abuse them so much I doubt if it matters one way or the other.

Good Luck
Bob
soar-ne is offline  
Old 01-09-2008, 04:57 PM
  #3  
Crashly
Crashly
Thread Starter
 
Join Date: Jul 2007
Posts: 6
Default Still learning

Thanks for your reply Bob. I havnt noticed any performance differences although when I turn the prop by hand that clunky feel as the windings pass from magnet to magnet is much weaker than when new. Might just be from pushing these motors to thier limit, heat etc.

Cheers,
Dan
Crashly is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
sportrider_fz6
Beginners
12
04-25-2008 10:50 PM
boodaghost
Warbird Electrics
3
01-09-2008 03:15 AM
Larry G
Warbird Electrics
3
12-19-2007 01:57 PM
Larry G
Warbird Electrics
4
11-29-2007 02:47 AM
Mingus the Red
Warbird Electrics
6
07-29-2007 02:25 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Quick Reply: PZ gearbox Motor Question For poor Spitfire


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

Page generated in 0.10730 seconds with 13 queries