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Other › Servos for Logo 10?
10-23-2004 10:19 AM  13 years agoPost 21
Saint728

rrProfessor

Honolulu, Hawaii

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the Futaba S9650 servo...I'd love to use these servos but where can you find 20mm long servo arms that allow you to position the arm on the servo so as to minimize the use of subtrim? Futaba's largest wheel is a couple of mm short of 20mm.
You can use any Futaba servo arm or wheel. The full size servo arms are the same size as the S9650 servo arms.

Take Care,
Cheers, Patrick

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10-23-2004 10:34 AM  13 years agoPost 22
ScotY

rrApprentice

USA

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Yes, but the biggest servo wheel I've seen for Futaba servos is 17.5mm. Does not the Logo 10 need 20mm?

The problem with the Dubro servo arms that I've seen others use is that arm pretty much goes on the arm in one position...if it's not perfectly 90, there's not much you can do except use subtrim. That's not a good thing.

Am I missing something?

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10-23-2004 11:45 AM  13 years agoPost 23
rscamp

rrVeteran

Ontario, Canada

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Yes, I think full 20mm length is required. The HD JR arms are this length.

I wasn't aware what the difference was between the "SA" and non "SA" 3421s. If the difference is the gear material, I would prefer the nylon. However, the metal gears on the 3421 are very precise and not an issue to my knowledge and experience. I suspect the quality fo the gears is one reason why these servos cost as much as they do.

Rob

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10-23-2004 12:49 PM  13 years agoPost 24
Saint728

rrProfessor

Honolulu, Hawaii

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The biggest servo wheel for Futaba is 19.5. 17.5 is the smaller wheel, 4 arm and 2 arm. I think 20mm is too long for a Logo 10? Even my rudder servo arm is only 17.5mm. I use 17.5mm on all my servo arms on my Logo 10.

Take Care,
Cheers, Patrick

Check the hotties in my Gallery
http://rc.runryder.com/helicopter/gallery/9019/?all=photo

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10-23-2004 05:41 PM  13 years agoPost 25
rscamp

rrVeteran

Ontario, Canada

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Patrick.

20mm is recommended by Mikado for 3D setups. It provides greater linearity of motion for the swash - particularly at the collective extremes.

Rob

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10-23-2004 05:45 PM  13 years agoPost 26
Heli-nek

rrApprentice

Vancouver, B.C.​Canada

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20mm would give it more throw, esspecially for 3D.

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10-23-2004 07:08 PM  13 years agoPost 27
SBK

rrVeteran

NE Ohio

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For JR servos, JRPA215 servo arms, two in a pack with screws, fit perfectly with the outer most hole at 20 mm.

SBK

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10-23-2004 08:01 PM  13 years agoPost 28
ScotY

rrApprentice

USA

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Ah, you're right...19.5mm on the large wheels. Memory is not what it used to be. I suppose .5mm short isn't going to hurt too much.

I don't have a Logo yet (hence the many questions) but I suspect why you're using the shorter arms is that it keeps the pushrods to the swashplate more horizontal since the servos are wide. If the helicopter was designed based on 20mm arms, you're probably seeing more interaction at the extremes of travel than you might otherwise get?

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