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BL motor question

Old 06-21-2011, 06:46 PM
  #1  
RC Fan Chris
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Default BL motor question

I have a scratchbuilt plane affectionately called the 'beater jet' (not pretty up close, but definitely convincing as a jet in the air) and after flying it a couple times, I noticed something. The motor was almost hot. The cowl (off a super cub, lol) allows plenty of airflow, though I've since cut out some more plastic so it resembles an Extra cowl.
So here are some relevant specs: Motor is a Suppo 2217-8 BL, battery is a 3S 20C 2200mAh LiPo, ESC is 50 amps, prop is 10x6 scimitar profile, wingspan is about 50 inches or so, and weight is around 30-40 oz.

I wasn't flying at full throttle all the time, though since it was nose-heavy, I had to keep some throttle on it to keep it flying. It glides like a brick, too, but probably due to it's nose-heaviness.

So is the motor temp something to worry about? What can I do to cool it down?
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Old 06-21-2011, 08:55 PM
  #2  
slipstick
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One person's "nearly hot" may be someone else's "barely warm" so it's impossible to tell much from a description like that. If you can't keep your hand on it for 10 seconds or so then it's probably getting too hot .

BTW just having holes in the front isn't enough....you need to make sure there's somewhere for the heated air to get back out . Exit holes are at least as important as entry holes but are often forgotten. But if it's really getting too hot the easiest fix is to use a slightly smaller prop...that'll sort it out.

Steve
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