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HelicopterMain Discussion › Servos and how far to mount the ball links?
10-08-2005 03:19 AM  12 years agoPost 1
QuickSilver

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Cherry Hill, New​Jersey

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I am looking for any type of input on the mounting of ball links on servo horns when it comes to things like how far should you mount the ball links should they be close to the center as possible and raise the ATV's or should you put them out as far as possible and make the ATV's lower? I know it all depends on the servos you use because of the torque ratings of different servos the farther out you go the more the torque drops off but you gain speed I would think. Any input on this would be very helpfull.

THanks,

Kyle

Stanley Bostitch
Proto Tools

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10-08-2005 03:48 AM  12 years agoPost 2
airdodger

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Johnston USA

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Just what you stated if you need torque in close, speed move out. I keep around 100% atv, it is the middle road between the two. All this is if you have the correct servo to handle the need. Chris

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10-08-2005 08:08 AM  12 years agoPost 3
J3DI

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Oswestry,​Shropshire. UK

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You should try and setup with all ATVs at 100% then judge where to fit ball links at these settings. This then gives you a little room to adjust your ATVs when fine tuning later on. I guess if you want more speed from your servos then you should upgrade them??

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10-08-2005 01:15 PM  12 years agoPost 4
doorman

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Sherwood, Arkansas

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How Far???

It seems to me that most heli's on the market today usually call for between 15 to 18mm from center.... on some of the newer ccpm units, I have seen 20 to 23mm.....
I think it is more of a question on a per heli basis mostly, due to the different set ups used... but as stated earlier, you want to try and work to get the proper throws with the ATV's set at 100%, or as close as possible so that you can keep linear travels...

AMA 2918-Team JR, Spin Blades, East Coast Scale Helicopter,Castle Creations

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10-08-2005 01:57 PM  12 years agoPost 5
JuanRodriguez

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The Villages,​Florida

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you want to try and work to get the proper throws with the ATV's set at 100%, or as close as possible so that you can keep linear travels...
And if you follow the heli manufacturer's instructions (they usually give you the recommended dimensions) that will get you very close or at least, in the ball park....

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10-08-2005 02:11 PM  12 years agoPost 6
nivlek

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Norfolk England

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I try to use a minimum of 100% .

At the end of the day , it gets dark .

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10-08-2005 03:23 PM  12 years agoPost 7
QuickSilver

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Cherry Hill, New​Jersey

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Well following the MFG specs isn't always the best. Case in point the Raptor 50 for elevator they want you to space them at approx 10 to 12 mm from center! But yet Alans machine has them about 16 out from center using the Airtronics 94758. So when he moves his stick just a small amount he gets alot of travel. Now I am using all 9252's for control surfaces and one 9451 on the pitch. Now you talk about the servos being LINEAR and I keep hearing 100% and 100% but correct me if I am wrong you can still have linear travel and not have the ATV'S at 100 and 100 (I.E. 60 and 60 is still linear but now the servo does not travel as far) right?

Kyle

Stanley Bostitch
Proto Tools

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10-08-2005 03:44 PM  12 years agoPost 8
airdodger

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Johnston USA

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10-08-2005 04:18 PM  12 years agoPost 9
doorman

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Sherwood, Arkansas

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Great Post!!!!!

airdodger, I have to say thanks for that link........I am certain that everyone that reads it will feel so much better about this subject now.... I know I do......(yeah right)..!!!!!

QuickSilver, the answer to your question is YES..... 60/60 is also linear...
As far as for the instructions... they are all "usually" a good starting point so that the new heli builder (and old timer like me!!!) will have a good reference point to start from. Sure, you can use a stronger servo and add the length... won't hurt a thing.... but as you call oout on Alan's machine, he may also be running some expo to soften the center but still allow him all the throw he needs, but still be smooth.... and you can bet that he is also certain that the added throw is not causing a bind anywhere during his flight....
So, sure you can go longer if need be, and you adjust the throws to your likeing..... just watch out for the over travel/binds......
Hope it helps....

Stan

AMA 2918-Team JR, Spin Blades, East Coast Scale Helicopter,Castle Creations

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10-09-2005 02:01 AM  12 years agoPost 10
x-planker

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Ontario, Canada

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I read an artical in the new rc heli mag and it stated that torque and speed are measured at 1 inch from servo center. so i figure that as long as you stay under 1 inch your not exceeding the servo limitations. as far as atv's go i personally like to keep them around 100% but as we all know that doesn't always work out on my raptor 30v2 they are all around 75%. I don't like the arms to travel too much.

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10-09-2005 02:04 AM  12 years agoPost 11
Yug

rrMaster

UK. Herts

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Go for 100% ATV if possible.
Place a washer between the ball and horn to help it not to split the horn.
Better still, use metal horns.

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10-09-2005 02:07 AM  12 years agoPost 12
Yug

rrMaster

UK. Herts

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typically if you have a spec that says 9Kg/cm 0.1@4.8v, then you will get a torque of 9KG at a radies of 1cm, and the no load speed of the servo will be 0.1 seconds over 60 degrees.

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10-09-2005 02:59 AM  12 years agoPost 13
QuickSilver

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Cherry Hill, New​Jersey

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Thanks X-planker

Thats what I was wondering! When they test a servo for speed/torque how far out are they going on the servo arm...I know they calculate the speed by how long it takes to travel 60 degrees but they never tell you how far out they put the load on the servo before it cant lift it. Now I know that if I stay inside of an inch I will be ok.

Thanks for everyones input.

Take care

Kyle

Stanley Bostitch
Proto Tools

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10-09-2005 08:09 AM  12 years agoPost 14
nivlek

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Norfolk England

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The only problem , imo , with servo specs is that the speed is quoted off load , so doesn't mean a thing unless it's on your throttle ! Under load conditions, a servo that is quoted as having a higher torque may actually be quicker than a lower torque sevro which is quoted as being a faster .
If servo speeds were quoted at various loads it would be much easier to make the right choice for your individual application .

At the end of the day , it gets dark .

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HelicopterMain Discussion › Servos and how far to mount the ball links?
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