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short tail shaking when adding throttle

Old 03-10-2006, 11:43 PM
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Rello
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Default short tail shaking when adding throttle

hi all,

the 450xl is hovering fine with the 401 and the futaba servo.

but when i am in hover and want to make a little "jump" up by suddenly adding pitch/throttle, the tail will shake quite drastically for some time until its stable again.

is this normal? i tried different sensitivity settings on the gyro but no success.

thanks for advice,
Marcel
Old 03-11-2006, 09:00 PM
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chipperg
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Default RE: short tail shaking when adding throttle

Make shure the center for the tail rotor is the same in hh mode and non hh mode first. If they are the same, set the gyro sense to 30-40 with both settings on the actual gyro full left. Try that and let me knoe. Had this problem also
Old 03-12-2006, 12:37 AM
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hdoc
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Default RE: short tail shaking when adding throttle

Rello:

Which Futaba servo??? Digital or not?? A 'strong' enough unit for the tail?? Any binding in the pushrods or links?? Which way does it start yawing??

All important factors. Sounds like minor readjustments will have to be made, but will be helpful to have the data.

Lloyd
Old 03-12-2006, 12:45 AM
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Default RE: short tail shaking when adding throttle

Rello:

One additional thought. You may have far too much gain in HH mode--I started at 90 as suggested in the 401 "manual" and had severe wagging. Now down to about 60-65 and have virtually none.

Lloyd
Old 03-12-2006, 02:42 PM
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Rello
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Default RE: short tail shaking when adding throttle

hi,

it's the digital S9650.

when it shakes the tail goes from right to left several times (degree getting smaller every time) until its back centered.

I will go down now and try again with the hh and non hh setting...
Old 03-12-2006, 04:28 PM
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hdoc
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Default RE: short tail shaking when adding throttle

Rello:

the 9650 is the best--- Back to basics---

Make sure The "DIGITAL" switch is set "ON"
Be sure "DELAY" is "0" (Closely see correct position on gyro)
To Start, mechanical set-up:

With the Servo in "NEUTRAL" position, be sure the pushrod link is at top dead center on the servo with the Tail Rotor blades essentially in "NEUTRAL" (flat) position. You can use any hole---I used the 'middle one'(Shortest radius). Tighten the servo on the boom at about a 45deg. angle so the top of the servo arm is centered on te boom, and the pushrod is parallel to the boom. DO NOT use the "guide" on the Horiz fin holder--It's too short. Pushrod needs no support.

Check servo "throw" with Xmitter & Rec ON---If travel is too high, lower "LIMIT" Pot on Gyro.

I would then go thru the 401 instructions, as Chipperg suggested, This should give excellent mechanical & electrical set-up.

Start with about 75% HH sensitivity on your Xmitter & work from there. Thinking about it again, be sure the Digital is ON & Delay is "0". Check for any binding as well

Hope this is helpful.

Lloyd
Old 03-14-2006, 10:46 PM
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Rello
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Default RE: short tail shaking when adding throttle

i still could not find out where the error is.
i will get an other servo head to reduce distance to the turningpoint to reduce the movement of the tail because it simply looks like overreacting.

can a wrong headspead have an influence?
i don't know what mine is - and i don't know how to find it it out without spending so much mony for a one time action...
Old 03-18-2006, 12:33 PM
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Rello
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Default RE: short tail shaking when adding throttle

ORIGINAL: Rello
can a wrong headspead have an influence?
i don't know what mine is - and i don't know how to find it it out without spending so much mony for a one time action...
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