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HelicopterBeginners Corner › Chinese Weights
11-24-2006 02:26 AM  11 years agoPost 21
ESWLFSE

rrElite Veteran

Liberty Hill, TX

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I did already. There are weights installed on a post near the root of a rotor blade and located such that the centrifugal force they create counters the blades wanting to go flat-pitch at speed due to the aerodynamic forces. Its just a way to use centrifugal force to offset aerodynamic force and it reduces the force require to hold pitch in a rotor blade. I guess Bell 47s have these.

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11-24-2006 02:44 AM  11 years agoPost 22
Portblock

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Van Nuys, CA

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Just curious, how is the weight added?

All I come up with is the weights tailing, and wanting to also flatten the blades.

The voices in my head can beat up the voices in your head.

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11-24-2006 05:58 AM  11 years agoPost 23
CK_

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Redondo Beach, CA

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The effect is called tennis racquet effect because if you swing a tennis racquet around in a circle it will twist to align with the disk of rotation. This happens because mass is not evenly distributed around feathering (pitch change) axis. There is mass in front of and behind the axis but little above or below. The Joker is the only RC machine I know of that uses Chinese weights.
Tailgrips with pmw

With these grips the force for changing tail pitch is reduced down to about 25%, so the tail reacts faster to stick deflections, the power consumption of the servo is lower and the servo lasts longer. Fully compatible with the (old) plastic tail grips.

Ord.-no. 829 conversion kit

Pic Link

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11-24-2006 07:22 AM  11 years agoPost 24
Portblock

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Van Nuys, CA

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Interesting...

Why do we not see them on other heli's (serious question)?

The voices in my head can beat up the voices in your head.

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11-26-2006 12:15 AM  11 years agoPost 25
Le-Bleuet

rrNovice

N/A

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From Mr. Helicopter himself, Ray Prouty:

"On a helicopter, the Chinese weights are placed "crosswise" to the blade. Somebody connected this to old sailer's tales about Chinese maidens."

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11-26-2006 01:59 PM  11 years agoPost 26
kangarooster

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Orlando Fl-USA

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Then do Chinese weights counteract delta 3?
I am still trying to figure out how rotor heads work.
The more I learn, the less I understand.

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11-26-2006 09:19 PM  11 years agoPost 27
CK_

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Redondo Beach, CA

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No, delta 3 creates an aerodynamic flapping spring. The tennis racquet effect due to centrifugal force can be thought of as a torsional feathering spring that wants to return the blades to zero degrees. Chinese weights are used to decrease the strength of this imaginary torsional spring.

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11-26-2006 11:20 PM  11 years agoPost 28
kangarooster

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Orlando Fl-USA

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Thanks. that explaination helped.

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11-14-2007 01:11 AM  10 years agoPost 29
OK heli2

rrNovice

Enid,OK

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Do a search for Chinese weights.There is a topic with over 200 posts that will explain it all.

Blade CX2 Min Air .90 Trex 450xl Hobbico Nexstar

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11-14-2007 03:57 PM  10 years agoPost 30
spog

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Ontario, Canada

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I asked a girl if she was chineese once, oh, holy mother of mary, and the rest of the gang
Yup, the japanese are some of the most racist people on the planet. There is a good report about this on the UN website.

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11-16-2007 04:51 PM  10 years agoPost 31
dlflyer

rrApprentice

Flushing, Michigan

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Go to wal-mart if you need to know anything about chinese stuff. Will those tail grips fit my 450 TREX? Somebody PM me a link please

We have a Great country Because we have Great People

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11-17-2007 05:27 PM  10 years agoPost 32
ShellDude

rrElite Veteran

East Coventry, PA

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You can do the mod yourself too... info is scattered throughout the various forums and community sites.

Some erroneously credit Bob (Finless) White for the "discovery" but I suspect the Chinese have been around a bit longer than Bob.. I could be wrong though


I too made the mistake of asking a woman if she was chinese once. I was told that there is chinese food, not people.

~~OCHC~~
http://www.glumbert.com/media/spiders

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HelicopterBeginners Corner › Chinese Weights
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