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Author Topic: Counter clockwise motor rotation.  (Read 1253 times)

Offline Avaiojet

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Counter clockwise motor rotation.
« on: December 20, 2013, 05:40:06 AM »
I see prop adaptors are available both for counter clockwise rotation applications and for clockwise rotation applications.

Be interesting to know if this was really an issue and if it is necessary when choosing a prop adaptor?

One would think, once the collet shaft nut is tightned, that would be it, regardless of rotation direction?

Charles
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Offline John Cralley

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Re: Counter clockwise motor rotation.
« Reply #1 on: December 20, 2013, 05:56:06 AM »
To me, it would seem the only difference would be in case of a prop ground strike.  y1
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Offline Dean Pappas

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Re: Counter clockwise motor rotation.
« Reply #2 on: December 20, 2013, 02:21:02 PM »
Hi Charles,
Where do you see this?

Thanks,
  Dean P.
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Dean Pappas

Offline Avaiojet

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Re: Counter clockwise motor rotation.
« Reply #3 on: December 20, 2013, 02:59:07 PM »
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Offline Mike Lauerman

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Re: Counter clockwise motor rotation.
« Reply #4 on: December 22, 2013, 10:08:10 AM »
Chrysler Corp went to great expense in the '40s-'60s with lug studs/nuts having left hand threads on the left side of their cars. (theory was that the reciproprical direction tended to loosen nuts/bolts with thread direction opposite.)
 
Apprentices in a Volkswagen dealership used to forget to tighten lug bolts sometimes, a few customers lost left wheels (in 3 cases, Both left wheels!) All the lugs were found to be loose, but only the left ones walked out.
VWs were all right hand thread...

I was always surprised that prop nuts on model airplane engines were all right hand thread...with the prop turning CCW. I 'loosened' a few in flight...but with wood props, some 'squish' was blamed, along with forgetting to check tightness before flight...

If a hub for electric motor had to be purchased anyway, I'd go with the CCW for CCW...
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Offline Avaiojet

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Re: Counter clockwise motor rotation.
« Reply #5 on: December 22, 2013, 10:33:59 AM »
Quote from: Mike Lauerman on December 22, 2013, 10:08:10 AM
Chrysler Corp went to great expense in the '40s-'60s with lug studs/nuts having left hand threads on the left side of their cars. (theory was that the reciproprical direction tended to loosen nuts/bolts with thread direction opposite.)
 
Apprentices in a Volkswagen dealership used to forget to tighten lug bolts sometimes, a few customers lost left wheels (in 3 cases, Both left wheels!) All the lugs were found to be loose, but only the left ones walked out.
VWs were all right hand thread...

I was always surprised that prop nuts on model airplane engines were all right hand thread...with the prop turning CCW. I 'loosened' a few in flight...but with wood props, some 'squish' was blamed, along with forgetting to check tightness before flight...

If a hub for electric motor had to be purchased anyway, I'd go with the CCW for CCW...

Most guys are running clockwise rotation on their motors.

Charles
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Offline Avaiojet

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Re: Counter clockwise motor rotation.
« Reply #6 on: December 23, 2013, 11:23:31 AM »
I was told these CCW collets are used in "quad" applications.

Those devices that hover and carry cameras, fly with four motors.

So I was told.

Charles
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Offline Paul Wood

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Re: Counter clockwise motor rotation.
« Reply #7 on: December 23, 2013, 06:22:11 PM »
Mike,

I think that the momentary acceleration of the piston at the point of combustion will cause the prop nut to tighten on a CCW rotation engine.  I know for a fact that when a 4 stroke backfires, the prop nut will loosen instantly.  I've had more than a few props almost take my face off in the early days before we started using double prop nuts.

Paul
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Online Lauri Malila

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Re: Counter clockwise motor rotation.
« Reply #8 on: December 24, 2013, 04:15:23 AM »
 I think that those qadrocopters and such have these over-engineered details, like the left hand prop nut, because often people who design & operate them are not classical aeromodellers. If you don't have a "touch" for mechanics and the forces required, it's better to make a safe design.
I wouldn't mind having a left handed prop screw for our big 2-stroke engine, it runs clockwise. Most often the right handed thread is just fine but if the engine decides to kick backwards, it loosens the screw. L
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