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Cannot decrease RPM at high speed

 
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JL2A



Joined: 07 Apr 2015
Posts: 113
Location: Australia
PostPosted: Fri Jun 14, 2019 3:26 am    Post subject: Cannot decrease RPM at high speed Reply with quote
We have installed the Chinese 3 blade JL2B on a CJ with M14P. It has the small counterweights and spinner.

Propeller behaves normally except that as airspeed increases, the RPM cannot be decreased even with prop control lever all the way aft.

For example, after take off set 80% RPM for cruise climb - then level out and let airspeed increase then the RPM cannot be reduced. At slower airspeeds it will go back to 50-60% depending on airspeed (around 120 KIAS)

Is this a function of the small counterweights?

Or more likely a governor spring or set up issue?

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cjpilot710(at)aol.com
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PostPosted: Fri Jun 14, 2019 7:15 pm    Post subject: Cannot decrease RPM at high speed Reply with quote
Check your low pitch setting. Jim "Pappy" Goolsby

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glipaz



Joined: 11 Jan 2011
Posts: 110
PostPosted: Sat Jun 15, 2019 2:49 pm    Post subject: Re: Cannot decrease RPM at high speed Reply with quote
Did it ever work ok or is this a new install?

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JL2A



Joined: 07 Apr 2015
Posts: 113
Location: Australia
PostPosted: Mon Jun 17, 2019 2:05 pm    Post subject: Re: Cannot decrease RPM at high speed Reply with quote
New install.

It is not the low rpm stop setting - it will govern down to 50-60% at low speeds / power. Do you mean the low pitch stop for the blades? It was set up as per the book...

I've read that the whirlwind propellers came with a stronger spring for the governor to give it more oomph - wondering if the symptoms were the same?

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