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120 SP 4 blade prop size.

Old 10-15-2009, 11:52 PM
  #1  
gasayers
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Default 120 SP 4 blade prop size.

Hi all. Still sorting out my RCV 120 sp.
I actually had the motor installed in my BT spitfire and all ready to go but after running it up on the ground for 2 minutes I took it out until I can sort out the vibration issue.[:@]
It starts like a dream. Runs like a dream, idles like a dream, vibrates like a ........
I removed the shim to try and reduce vibration a couple of days ago and that seems to have helped a bit.
Anyway, hope fully another two years of running in will smooth it out. (Sigh)
I've also just installed an old (very very old!) OS silencer set. I think I now have the worlds quietest 120 SP
Question. What’s the latest word on a four bladed prop?
I'm running a 15.5 x 12 and it seems a little small. any suggestions?

Cheers
Glen
Old 10-16-2009, 12:35 AM
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PeterF
 
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Default RE: 120 SP 4 blade prop size.

The RCV recomended 4 blade prop for SP-120 is 15.5 x 12.
Old 10-16-2009, 03:53 AM
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gasayers
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Default RE: 120 SP 4 blade prop size.

Ah stupid me. Typo.
I am running the 15.5*12 prop not the 12.5*12.

Guess it's right. It's only in a 11.3 pound plane. (BT spitfire) Should be plenty of power. Going to run in it for another hour tomorrow morning hopefully.
Cheers

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