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Home✈️Aircraft🚁HelicopterThunder TigerOther › Removing teetering shaft in R50 alloy head when using infinivation dampners
07-22-2006 12:51 PM  14 years ago
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Salby

rrApprentice

Christchurch New Zealand

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Removing teetering shaft in R50 alloy head when using infinivation dampners
Has anyone removed the teetering shaft on an R50
I know they remove them on the 90 when using Infinivation dampners.
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07-22-2006 02:07 PM  14 years ago
Ben-T-Spindle

rrProfessor

Central Illinois

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I never did understand the theory behind removing the teetering shaft?

I would like someone explain to me exactly what is going on and how it effects the cyclic characteristics of a helicopter?

.
... BTS
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07-22-2006 05:17 PM  14 years ago
Tday

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Needham, MA

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Hey BTS---this probably isn't *exactly* what the theory is, but here's my take. The red/blue dampeners allow the feathering spindle to move/flex--to dampen some of the harshness of cyclic control, I guess. The teetering pin anchors the middle of the spindle to keep the deflection modest and in control. The teetering pin is also a potential source of rf interference with the spindle rubbing on it during deflection.

The infinivation dampeners and the carbonextremes don't flex much at all---only to a pre-engineered max determined by the o-rings since the dampeners themselves are rigid. So, there isn't any real need to anchor the middle of the spindle to control the amount it moves. AND eliminating it eliminates a potential rf source. You can keep it on with these dampeners, but it doesn't make any difference.

Tom
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07-22-2006 06:41 PM  14 years ago
Ben-T-Spindle

rrProfessor

Central Illinois

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So you are saying that it flies the same (I am already using infinivation dampeners) but the radio will work better?

.
... BTS
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07-23-2006 04:40 AM  14 years ago
Tday

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Needham, MA

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Yes, less prone to rf generation where the spindle passes through the pin. Tom
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07-24-2006 12:17 AM  14 years ago
Ron Henry

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Atlanta area, GA - USA

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The only people that I've heard of experiencing occasional 1/2 second or so lockouts when running the Infinivation dampners with the center pin were pilots with a 14 or 12MZ while using the G3 RX. I would not remove the pin if you're not experiencing any glitching issues. When you remove the pin, the entire weight of the heli is riding on the dampeners instead of the head block. I've also heard reports of people pilots experiencing blade tracking issues when running without the center pin. Dino at East Coast Extreme came up with a great solution of creating a center pin out of the same material that the dampners is made of. This eliminates the very occasional issue with glitches and transfers most of the loads of the heli back to head block where it belongs and allows the dampners to work better. I've never heard of anyone recommending to remove the center pin in a 50 nor can I see how there would be any benefit. I'd leave it in.- Ron Henry
http://kaizenrc.com/forum
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07-24-2006 11:28 AM  14 years ago
Salby

rrApprentice

Christchurch New Zealand

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Thanks guys, I think I will leave the pin in.
I havent had any radio glitches so far.
I did have a bad head shake when I loaded the head doing tic-tocs but found that if I lubricated the spindle shaft it stopped.
The infiniaviation dampners instructions say not to lube the dampners, But I guess they are talking about the outside with the o-rings & not the spindle shaft itself.
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07-24-2006 09:45 PM  14 years ago
hornet dave

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Cedar Rapids, IA USA

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I have removed the center pin on the raptor 50 without any issues. I didn't notice any difference in flight behavior, and it only saves about half an ounce if you remove the pin and the bearings which support the pin on the metal head.I got a fever! The only prescription is MORE 6HV
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07-24-2006 11:18 PM  14 years ago
beidle99

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West Deptford, NJ

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From my understanding the RF problems really only arise when you run metal grips with carbon blades. The blades create static electricity which cannot be isolated from the rest of the head if running metal grips. Carbon fiber does strange things with electricity. In 1/12 scale pan car racing on carpet, the carbon fiber would create enough static electricity that it would send the new spektrum receivers into failsafe mode. Take it for what its worth but it makes sense to me.
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