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HelicopterAerobatic FAI F3C F3N Contest › Mixing servo brands with TX brands
09-16-2007 03:16 PM  10 years agoPost 1
jonesjj

rrApprentice

Northern IL

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Have a question about mixing specificly JR digital servos with the Futaba 14MZ.

Would you still get the speed and resolution out of the TX by using diffrent brand servo like the JR 8717 with the 14MZ.

or should you stick with Fut digi servos to get the most out of the system like the 9155's or 9451's

Thanks

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09-16-2007 05:24 PM  10 years agoPost 2
Dr.Ben

rrMaster

Richmond, VA, USA

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Jeff,

If you're going to do this contest stuff, you need to consider the 9255's. In the 3D world, servo design of late has been driven by torque and speed. No one seems to care as much about resolution, the feel of the servo around center, and even to some exent the absence of slop in the geartrain. These things are hypercritically important for a contest model to provide the needed collective feel in hover as well as predicable aerobatics. And the 9255 is just superb in these areas.

Ben Minor

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09-16-2007 06:07 PM  10 years agoPost 3
RCHelicopterGuy

rrVeteran

Michigan

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Dr. Ben,

On the topic of torque and speed, I have a question.

Do you think that a 9255 has sufficient grunt for the collective on a mechnical mix machine? Currently, I'm running Airtronics 94453 contest analogs at something around 120 oz./in., and what I'm beginning to notice is that it's hard for me to stay on top of the collective in the wind, because the fine resolution just isn't there. I end up overcorrecting all the time because I'm expecting it to respond when I move the stick, and it's not responding as predictably as I would have hoped.

I've been considering going to a JR8711 on collective (over 400 oz./in.) because my original theory was that I'd need a powerful servo on collective to keep control of swash movement, and that an overabundance of power would make fine control a non-issue. Your mentioning of the 9255's consistency and fine-touch control makes me wonder if I need a more powerful servo, or a more precise servo.

What are your thoughts? (Or anyone's, for that matter?)

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09-16-2007 06:14 PM  10 years agoPost 4
jonesjj

rrApprentice

Northern IL

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Ben,
Thanks for the feedback here on this, moving forward with doing this contest flying I want to be shure that what I do or buy will be in the diretion the I should be going, I really hate spending money twice for things.

I have been doing lots of searching of post and found this one that GM-1 started on mCCPM VS eCCPM in FAI here http://www.runryder.com/helicopter/...hlight=stratus.

Great reading to hear the input of yourself and other proficiant flyers.

Jeff

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09-17-2007 07:30 AM  10 years agoPost 5
Henrik Engert

rrKey Veteran

Cedar Park, TX

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Do you think that a 9255 has sufficient grunt for the collective on a mechnical mix machine?
I do think the 9255 has enough grunt for this. I run the older 9252 right now and it works just fine for the pitch on a mechanical mixed machine. I used to run the Futaba 9350 and it does differ from the 9252, so it did take a few flight to get used to the 9252 on the pitch. I will however switch to either a 9255 or a 9351 for the pitch later on.

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09-17-2007 04:00 PM  10 years agoPost 6
jonesjj

rrApprentice

Northern IL

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Here is a question,

Do people think that there should be the same servo on thro as the colective and control surfaces?

This would be for same resolution sort of, matching all the rest to make a system that reacts alike to all inputs.

Would it make any sence to have a thro servo that is any faster than the rest ?

Thanks

Jeff

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09-17-2007 04:06 PM  10 years agoPost 7
RCHelicopterGuy

rrVeteran

Michigan

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Personally, I say use as fast a throtle servo as you can get. I use a Futaba 9253 on mine. The way I look at it, there's no such thing as being "too connected" to your throttle. Just one man's opinion.

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09-17-2007 04:43 PM  10 years agoPost 8
Henrik Engert

rrKey Veteran

Cedar Park, TX

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I don't think there is a need for matching pitch and throttle. The reaction of the throttle is too slow anyway. People always says to use fast servo on throttle with for example the GV-1, but I have absolutely seen no difference between running my 9254 and the 9202 on the throttle. You don't need it for F3C at least.

My opinion and experience.

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09-17-2007 04:52 PM  10 years agoPost 9
GM1

rrElite Veteran

Tallahassee, Florida US

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Throttle

I'm with Henrik on this one. I run a fast servo on throttle but, to be honest, I can't tell the difference unless the servo is tortoise slow. I DO want a servo that is accurate and doesn't wander around so that the rpm changes in hover.
Gordie

On a dog sled team, if you're not the lead dog, the view never changes.

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09-17-2007 05:34 PM  10 years agoPost 10
jonesjj

rrApprentice

Northern IL

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Good to hear opinions on this, so the 9253 or the 9254 would be just fine. I am going to go with the 9255's for the control surfaces.

Thanks
Jeff

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