RunRyder - Why are there so many bad Century posts?

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Century Hawk - Falcon - Raven - Predator > Why are there so many bad Century posts?

Phil Cole
Veteran
Location: Redwood City CA

The rubber springs do have a damping function. They are not simple springs.

If you were to replace them with a perfectly elastic spring then I suspect that there would be no end of resonance trouble. If you applied a flapping force to one of your blades, the head would sit there flapping until you stopped it. We rely on the o-rings in the model heli heads to absorb and damp the flapping forces.

'Perfectly elastic' means that once deflected, a spring (or whatever is being used as a spring) will oscillate back and forth forever. The energy that goes into compressing a perfect spring is returned when it rebounds.

Rubber o-rings are not perfectly elastic. If you compress them and let go, you don't get all the energy you put into compressing them back. The lost energy goes into heating the rubber. You can easily observe this by stretching a rubber band and feeling it with your lips. Different rubber types have different losses. Rubber bands are typically fairly elastic - otherwise slingshots and rubber powered airplanes wouldn't work. However, you wouldn't make a slingshot out of o-rings.

So, it's just as technically correct to call them dampers as springs.

08-02-2002 Over year old.

blazen
Senior Heliman
Location: California

Hub moment transfer springs

Quote
>>>The rubber springs do have a damping function. They are not simple springs.<<<

Phil
That is correct !!
Back in my original post on this subject I stated that its Function was to provide spring resistance to the flapping/teetering plain of the rotor head’s blade and spindle assembly. And that it provides Minimal Dampening.

After rereading that post I realized that I should have said its PRIMARY purpose was to provide spring resistance to the flapping/teetering plain of the rotor head’s blade and spindle assembly.

The Key word is Primary the “Dampener/ Hub moment transfer springs” does provide some dampening and this is an important function but again not its primary function.

A components name is usually derived from its primary function not its secondary or any other subsequent function.

A Cars motor mount is usually referred to as a motor mount, although it’s primary purpose it to align and hold the motor in place it does provide vibration dampening.

My point is It’s not merely called a dampener. It is sometimes referred to as a vibration damping motor mount but more often than not it’s just called a motor mount...

I was not trying to start a big debate on what this components primary function was, but merely stated that its name was not descriptive of its primary function.

Again more often than not a components name is usually derived from its primary function not its secondary or any other subsequent function.

BTW Stephen. .. I enjoyed your last post
Its nice to see people with an interest and a good understanding of how there toys work

73’s
Blazen

08-03-2002 Over year old.

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Century Hawk - Falcon - Raven - Predator > Why are there so many bad Century posts?

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