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December 18, 2018, 11:53:55 AM

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1
Electric Flight Technical / Re: Sqealing Heron (motor)
« Last post by paulinfrance on Yesterday at 16:59:12 »
Here's the sound of blades going 'sub sonic',, https://www.youtube.com/watch?v=yLwr7xn-ws4
2
Electric Flight Technical / Re: Sqealing Heron (motor)
« Last post by PDR on Yesterday at 15:07:42 »
It could be the prop tips getting too close to the sound barrier.  ???

Unlikely, and even if it were it would sound more like a circular saw. I'm sure you've heard it - the sound a modern airliner with high-bypass turbofans makes at max chat on take-off. That "circular saw" noise is the outer 10%(ish*) of the fan blades going supersonic in the warm ground-level air. Once in the climb at low altitude they throttle back to remove the supersonic flow (for noise abatement) and progressively increase rpm as they climb and the cooler air reduces the mach number for a blade speed.

PDR

* 10% would be typical but it can approach 30% depending on the configuration of the specific engine - consult your dealer handbook for specific advice. Your airline could be at risk if you operate supersonic fans in noise-sensitive environments without a license.
3
Electric Flight Technical / Re: Sqealing Heron (motor)
« Last post by paulinfrance on Yesterday at 13:47:46 »
Maybe a bearing or something is rubbing where it shouldn't,,,  $%&
4
Electric Flight Technical / Re: Sqealing Heron (motor)
« Last post by Chippie on Yesterday at 13:33:30 »
Bryan,
Did the motor squeel before the prop change? I'm guessing not, try the motor without the prop on it, try another brand/size of prop. I dont think the tips are going supersonic.... :''
5
Electric Flight Technical / Re: Sqealing Heron (motor)
« Last post by The Saint. (Owen) on Yesterday at 11:53:57 »
It could be the prop tips getting too close to the sound barrier.  ???
6
Electric Flight Technical / Sqealing Heron (motor)
« Last post by FlyinBrian on Yesterday at 07:24:27 »
I replaced the rather bendy prop supplied with the MPX Heron with a 12 x 6 Aeronaught prop, It pull 32A static but when running up on the ground there is a squealing noise.

I'm guessing timing but I dont know how to adjust this on the MPX Esc supplied with the RR version (40A)

As always any ideas or info welcome
Ta
BP
7
RC Flight Chatter / Re: HobbyKing
« Last post by British Victory on December 15, 2018, 17:14:29 PM »
How much discount did it give? any idea how long it is valid for?
the 10 is a bit of a hint. No I don't, sorry.
8
RC Flight Chatter / HobbyKing - discount code 14/12/18
« Last post by firefox on December 15, 2018, 15:03:10 PM »
Thanks for that, maybe other could post discount codes - maybe use the title and date of publication ie Al's hobbies 12/12/18
9
RC Flight Chatter / Re: HobbyKing
« Last post by Alan H on December 15, 2018, 10:49:28 AM »
How much discount did it give? any idea how long it is valid for?
10
RC Flight Chatter / Re: Thinners for Spectra paints
« Last post by British Victory on December 15, 2018, 10:27:03 AM »
Many thanks, as posted above I took pdr's advice and bought some xylene, I'll start spraying as soon as we get a warmer, windless day as my spray station is in the open air in the back garden.
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