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HelicopterVario Sky Fox - Benzin - Evolution - Xtreme › Acrobatic- 4 servo 90° swash vs 3 servo​120°swash
12-04-2011 04:43 PM  5 years agoPost 1
S Crutchfield

rrNovice

Arkadelphia,Ar. usa

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I recently puchased a Vario Acrobatic, and it comes with a 4 servo 90°swash set up. I am thinking about changing it to 3 servo 120°, but the ones i've seen done this way, causes the geometry of the push rods to be off.I looks to me like the side frames would need to be altered.

What are the advantages or disadvantages of these two systems? I have heard that on a 90° swash, the servos have a tendancy to fight each other or buzz, where on the 120°set up, this is is not a problem.

So why does Vario use this set up? Does it offer redundancy in case of a servo failure? I have stripped servo gears on 120°swash in the past, and it's an instant crash. I you lose a servo on a 90° set up, can you still land the helicopter?

Any thoughts or opinions would be helpful............thanks

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12-05-2011 02:26 AM  5 years agoPost 2
Billj

rrApprentice

Max Meadows,​Virginia

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My XLV has 4 servo CCPM.. I stripped 2 servos in flight and got it back.It was fortunate it was more or less one side and not opposites.

I think the 4 servo on an Aerobatic is more for torque to muscle around the gasser weight than redundency..
I know mine weighs at least 4-5 lbs more than my Spectra G.. When you start trying to flip that kind of weight at a fairly slow head speed (1650rpm)the servos are really working more than with a lighter bird.
Setting up at 90 degrees really shouldn't be any different than 120.. You just need to be very particular about your mechanical to reduce "buzzing".. Use of an in-line amp/volt meter really helps to find any binding or fighting

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12-05-2011 03:04 AM  5 years agoPost 3
S Crutchfield

rrNovice

Arkadelphia,Ar. usa

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thanks for the info!

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12-08-2011 01:41 AM  5 years agoPost 4
Logistics

rrNovice

Outside Chicago.....

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three here

Rotorfever,

The 4 servo setup will work just fine, but I've got two Acrobatics in 3 - 120 setup and never had a problem. However that being said, I've never had it setup for the 4 - 90. I bet you there are more Acrobatics on this forum than you would guess. Do a search and I'm sure you will come up with lots more answers.

Good luck.

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12-08-2011 03:44 AM  5 years agoPost 5
Eco8gator

rrElite Veteran

Palm Beach, FL

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Hello

I just got my Vario Acrobatic and I plan on running it on 90 degree CCPM since its the cleanest setup.

My only issue is only having one servo responsible for the elevator movement...seems like a lot even for a BLS252 servo on 6V.

I don't like the 120 setups Ive seen because the geometry is all out of wack...no matter how much Tx(even with my 14Mz) love I put into it I know the swash will be all over. I may have to make special brackets for the heli or go to the 4 servo setup.

Has anyone attempted to use std 90 degree ccpm for aerobatics with such a beast of a heli?

Carlo

Xera Motors
ProBar
Minicopter
Thunder Power

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