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HelicopterFlybarless Rotor Head SystemsOther › Trex 600 (non-ESP) ditch the push/pull???
06-05-2009 01:47 AM  8 years agoPost 1
SpeedVision

rrApprentice

Grand Rapids, MI USA

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I finally have all the parts to get my 600 back in the air.

Push-pull and servo resoloution seem to compete with each other in the new world of flybarless. Let me know your thoughts/experience.

Also, are there any aftermarket "aileron levers" to give the servos more leverage?

For the sake of focus, let's all agree that removing one of the push-pull rods will increase the liklihood of the single rod popping off. Good, got that out of the way.

Here are the basics:
Trex 600, non-esp
Gyrobot 700
3Dx head

Flybarless - The future was yesterday...you in?

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06-05-2009 02:16 AM  8 years agoPost 2
Jerry K

rrKey Veteran

Houston Area

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I have just finished installing QuickUK alum.28mm servo wheels on my 600 FBL. The nice thing is they have 4 different dimensions to set the balls at different radius' and can be rotated in 6 different locations to allow 90' setup without subtrim. On Vbar subtrim is used for something else. Vbar wants the balls set at 21.5mm I tried 24mm and can get +-15'

Jerry

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06-05-2009 11:56 AM  8 years agoPost 3
ChristianM

rrVeteran

Oslo, Norway

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Push-pull and servo resoloution seem to compete with each other in the new world of flybarless.
I do not agree with this statement. Push-pull and servo resolution complement each other. The benefit of a push-pull system is that it eliminates lateral forces on the servo such that loads from the blades do not result in flexing or rocking of the servo case which equates to slop. So a push-pull system allows you to reap the benefit of the high resolution servos and radio system.

The leverage rate on the linkage system is another story. When removing the flybar there is no reduction from the swash plate to the blade grips (a direct connection) which results in smaller servo rotation for a given pitch change than before. This will increase the speed but reduce the resolution and available servo force / torque. That is why many people add in a mixing lever to counter this effect or move the ball on the blade grip further out from the head. For a good setup the mechanics should be such that the pitch and cyclic CCPM swashplate mixing ratio in your TX is about 60%.

Christian

Burn fuel, be happy

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06-06-2009 01:13 PM  8 years agoPost 4
SpeedVision

rrApprentice

Grand Rapids, MI USA

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Push-pull and servo resolution complement each other. The benefit of a push-pull system is that it eliminates lateral forces on the servo such that loads from the blades do not result in flexing or rocking of the servo case which equates to slop. So a push-pull system allows you to reap the benefit of the high resolution servos and radio system.
I understand the benefits of push-pull, I just want/neeed more resoloution and I wasn't a big fan of having the servo horn balls on different centers from the lever balls. Since my 600 is a non-esp (RC-Motion frames, too), my lever center is parallel with the servo horn center, so I don't get any binding if I use different centers.
For a good setup the mechanics should be such that the pitch and cyclic CCPM swashplate mixing ratio in your TX is about 60%.
Swash mixing in the TX is turned off. The Gyrobot has no swash menu. In the case of the GB you set max limits and I wanted to get the limit numbers higher, for better resoloution...

Flybarless - The future was yesterday...you in?

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06-07-2009 01:59 PM  8 years agoPost 5
cub2000

rrVeteran

Massachusetts

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The push-pull is also to balance the load of the servos. Keep in mind that once the flybar system is removed, the stress on the servos goes up. Also, I think getting closer to the center on the servo wheel won't improve much resolution. I read that you're just forcing the ball bearings on the servos.

It's surely easier to setup without the push-pull.

I've just done maiden flight today with my 600ESP FBL, which I will post in another thread

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