traum
Full Member
sky's the limit
Posts: 165
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Post by traum on Mar 7, 2010 17:04:05 GMT -7
I know there are some experienced folks out there that can offer help. I have built a Yak 3, and it calls for retracts. I installed them as per the plan. I first installed a normal servo to run these, but found there was not enough torque to properly extend and properly retract. I purchased a Retract Servo, but now found it may be the wrong type. I note that the servo moves 180 degrees, which seems to far. The initial test ripped the servo out due to the torque, and the 180 degree.
Not sure if there are other servos that should be used vice the 180. I have tried to reduce the movement using the radio, but was unsuccessful. After reading some forums on the INTERNET it appears these are pretty much set to go from one end to the other.
Any suggestions?? Thanks in advance.
Bernd
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Post by Al Kramer on Mar 7, 2010 18:13:07 GMT -7
Is there a chance you could reduce the travel by using the inner holes on the servo arm?
Maybe you have already done that...
Al.
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helinutz2
Full Member
"Renegade R/C Heliflyers"
Posts: 150
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Post by helinutz2 on Mar 7, 2010 21:01:38 GMT -7
Bernd
Reduce your ATV's on the channel for the retracts. 100x100 is usually default. Try 50x50 for a start and then go from there.
Good Luck
2G
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Post by dave on Mar 8, 2010 9:11:14 GMT -7
Retract servos are two position, non-proportional servos. The only way is as Al suggested, or adjusting the push rods.
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Post by DouglasRosler on Mar 8, 2010 12:10:35 GMT -7
what you need to do is measure the stroke on your retract to see how much travel there is from all up and lock to all down and lock once you no that then you need to measure from the center of the screw on your servo out on your servo arm or wheel and try to get the same travel a180 servo has more travel then a 90 degrees servo.You can get a kit called control over-ride servo saver made by Du bro you need 2 kits.If you are going to use a 90 degrees servo you are going to have to use nothing less then 77 oz servo120 oz would be better it has a lot to do with the weight of the wheels
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Post by dave on Mar 8, 2010 12:27:02 GMT -7
Good info Doug. Still have that engine kicking around?
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Post by DouglasRosler on Mar 8, 2010 15:27:03 GMT -7
hello dave yes I do I have the crrc pro 50with pit muffler and I have a crgf 65 with a j-tec pits muffler.
thanks for asking.
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traum
Full Member
sky's the limit
Posts: 165
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Post by traum on Mar 8, 2010 19:44:12 GMT -7
Thanks all of you for the excellent infor/advise. after a few hours of work I managed to make this work. Lots of bending wires and manipulation of where the start and end points on servo are. It does now work. Bernd  |
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