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HomeAircraftHelicopterFlybarless Rotor Head SystemsOther › Is it time for higher resolution servos ?
01-20-2010 07:44 AM  8 years agoPost 1
dooooh!

rrApprentice

uk

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Do you think its time for higher resolution servos to counter act moving the balls in to 10mm on the servo wheels

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01-20-2010 11:58 AM  8 years agoPost 2
TomC

rrKey Veteran

Gold Coast, Queensland, Australia

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I agree with you 100%. I'm sick and tired of moving servo arms inward from the stock flybarred setup. Definitely need better servo resolution to begin with, and maybe higher torque as well!

Cheers,
TomC

Nqx,Mcpx-BL,300x,450x,500x,550x
Ion-x, 10s ,SS
TT X50E 10s, HC3-Sx

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01-20-2010 12:43 PM  8 years agoPost 3
jsenicka

rrProfessor

Eagle River, WI

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There are other places to make up the resolution.
For example, on a T700N they could move the output of all the ball cranks inward to give less throw to the head.
The problem is we are all converting ships meant for flybared

Jim Senicka
Team Manager, GrandRC Flight Team

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01-20-2010 01:14 PM  8 years agoPost 4
petmotel

rrKey Veteran

DeKalb, IL.

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Compass FBL heads drive the rotor grips off of the swash driver arms which lowers the mechanical ratio of servo to head movement. Kasama Srimok FBL heads use mixing arms at the grips to accomplish the same goal.

Point being there are methods to maintain servo travel and resolution in a mechanical setup without needing to reinvent the servos.

For what it's worth, I recently did a FBL head setup for a Compass Knight, and discovered if you take the servo balls inboard on a push-pull control system, the non-parallel link lengths change as the servo/control tee rotates. It's a very minute amount unless there is a big difference in the control ball lengths from center.

With my control tees at 14mm, and servo wheels at 7.5mm there is about 1mm of difference in link lengths at close to 90 degrees of servo travel from center. It was enough I decided not to use those ball spacings, and left them at 10.5mm which is close enough not to be concerned with.

I believe that as FBL setups become more popular, more manufacturers will introduce gear which will address the mechanical travel/resolution situation.

Jay

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01-20-2010 01:27 PM  8 years agoPost 5
TomC

rrKey Veteran

Gold Coast, Queensland, Australia

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Jim,

Good idea mate. I'm pretty sure most heli company's will do this in the future. That is, offer bellcrank hole options for FBL. Right now for most of us it is a bit of a pain to sacrifice swashplate CCPM resolution so that these FBL systems will work properly with our existing FB heli's.

You would have thought that the FBL system makers would have been able to have adjusted their systems to account for this in the first place. Maybe one day.

Cheers,
TomC

Nqx,Mcpx-BL,300x,450x,500x,550x
Ion-x, 10s ,SS
TT X50E 10s, HC3-Sx

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01-20-2010 04:23 PM  8 years agoPost 6
MrMel

rrProfessor

Gotland

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When I was flying my Stratus we had to "mod" it to get good cyclic rate with paddles, (hence they released BW version).

Guess what, it was PERFECT for FBL conversion.

New helis, T700, Aurora etc, they have upped the Servo->Swash ratio so you feel more connected, less interaction, simply put they rely on you having good servos, that's not good for FBL conversion.

So yeah, new bellcranks & different frame/double mounting option and your all set.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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01-20-2010 11:06 PM  8 years agoPost 7
jsenicka

rrProfessor

Eagle River, WI

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Just completed a quick update on my two flyable T700N airframes since weekend test flying. Both needed elevator rotation rate cranked up some. Also went to short balls on the swash. (instead of the 6mm QUK left from my QUK upgrade when built.)
I am running the small JR servo wheels with balls in the outer hole.
Swash is at 50 and 50 for cyclic, and 35 for collective. This gives me +/-10 cyclic and +/-13 collective. I could go a touch more collective, but I am binding the ball link ends on the servo output shaft if I give any substantial cyclic at full pitch. In the short term I need to move the balls to the outside of the servo wheels rather than the backside.
What we need is a set of bell cranks that have the ball to cyclic moved in about 10mm. Then we could use standard size align wheels.

Jim Senicka
Team Manager, GrandRC Flight Team

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01-21-2010 05:10 PM  8 years agoPost 8
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Are the new generation of metal gear HV servos any better resolution than the older servos?

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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01-21-2010 05:32 PM  8 years agoPost 9
Eco8gator

rrElite Veteran

Palm Beach, FL

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Electrically Im sure most decent RC companies can make a high res servo. The problem is more of a mechanical problem...I doubt anyone can point out an RC heli with no slop to take advantage of the high resolution.

The reason for all reduction to the head is to use more mechanical range of the servo...

Xera Motors
ProBar
Minicopter
Thunder Power

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