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03-30-2005 02:26 AM  13 years agoPost 1
Fuj

rrApprentice

Fairfield, CA

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What does it mean when you have to put a few clicks of trim one direction or another to keep the nose locked in.

IE. on my 90SE I have a 601. When I'm hovering, the nose wants to drift left slightly - if I did nothing it would keep going around. I put in a few clicks of right rudder trim and it stops. Should I be changing something mechanically or in some other part of my setup?

I'm using a 10x also.

Thanks,
Dan

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03-30-2005 02:37 AM  13 years agoPost 2
Saint728

rrProfessor

Honolulu, Hawaii

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You need to set it up in non HH mode. Make it so you have no subtrim. You have to make sure your servo arm is perfectly 90 degrees with the servo. You might have to keep rotating the servo arm until you get it just right. It may take a few different servo arms to find the right one. I use the 6 point servo arm because it has the most variable points to find the correct place. After you get the servo arm right, then you need to set the push rod to the correct length so the tail blades are straight and the tail doesn't move when hovering. After you get that right, switch it to HH and it should lock in solid.

Take Care,
Cheers, Patrick

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03-30-2005 03:39 AM  13 years agoPost 3
Fuj

rrApprentice

Fairfield, CA

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Am I messing something up if I'm running it as is with a few clicks of right rudder trim to keep it straight? What's the downside to operating it like it is - it's just 3 clicks of right rudder trim?

Thanks again!
Dan

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03-30-2005 04:24 AM  13 years agoPost 4
KenChoo

rrNovice

Perth, Australia

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Got a tag-on question here. Why does Jason Krause recommend just setting it up so that you have equal throws (servo and arm centered?), without needing to set it first in non-HH mode?

Ken

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03-30-2005 08:53 AM  13 years agoPost 5
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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You have to make sure your servo arm is perfectly 90 degrees with the servo.
Not so I asked Curtis about this since he builds in a slight differential, the servo arm is approx 30 degrees "right" rudder (eg forward) for neutral trim. See his FAQ question #75.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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03-30-2005 09:01 AM  13 years agoPost 6
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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Ade, yes I think its the same thing. Here's the FAQ:

Question # 75
Curtis, in the Vigor CS manual it tells you to build in a slight geometric differential with the tail setup, with the 'neutral' position of the servo (and tail pitch lever) slightly forward. Can you explain the rationale behind this? It seems that for any given servo movement, there will be less tail pitch increase when adding in thrust (clockwise yaw), and more tail pitch descrease when removing thrust (c/clockwise yaw). I would have thought it should be the otherway round.

Answer
The offset is to make up for the fact that the tail rotor responds faster to the right around center than it does to the left. This has to do with the tail rotor in affect having to fly upwind relative to the rotor wash when you give left rudder. The tail gets to move down wind relative to the downwash with right tail rotor. In a hover you already have enough right rudder to make up for the torque issue. Now the "upwind"/"downwind" issue dominates, this means the right rudder response of the tail is faster. If one direction is faster than the other then the tail response is not well balanced. This limits your total gain setting.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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