wonwinglo
SMF Supporter
- Joined
- Apr 18, 2004
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- First Name
- Barry
Not everyone owns a computer radio to adjust for throttle stall out,so here is how to incorporate a very simple saver for the servo to avoid stripped gears or at the worst a burnt out servo,if your throttle servo is ticking then you need a servo saver installing.
Attach to the servo arm/horn a brass ferrule that is free to rotate,through the ferrule drill a hole the thickness of the servo wire rod,you can buy these fittings made in either brass or nylon but the name escapes me at the moment,now you will need three very small collets or if you are good at soldering two cup washers would do the job but they are difficult to adjust properly,fit one onto the rod about one inch forward of the servo arm,now onto the wire slip a compression spring then another collet which is free to move and butts against the servo arm,next fit the last collet on the end of the servo rod aft of the other side of the arm,this simply stops everything falling off.
To test the device fully open the throttle and note when the spring compresses fully,if the servo stalls out simply adjust the first collet so the spring has closed but at the same time opened the throttle fully without any effort,now close the throttle and once again note how the spring closes,once again adjust accordingly.
If more movement is required such as on older radio sets just fit a longer compression spring.
All that is happening is that the spring is acting as a safety buffer, by not restricting the servo arms movement and thus avoiding the fatal stall out which will at the worst drain your battery and cause you to crash.
There was a commercial device which had a leaf spring attached directly to the servo arm thus causing the arm to give slightly when in the over-ride position.
Attach to the servo arm/horn a brass ferrule that is free to rotate,through the ferrule drill a hole the thickness of the servo wire rod,you can buy these fittings made in either brass or nylon but the name escapes me at the moment,now you will need three very small collets or if you are good at soldering two cup washers would do the job but they are difficult to adjust properly,fit one onto the rod about one inch forward of the servo arm,now onto the wire slip a compression spring then another collet which is free to move and butts against the servo arm,next fit the last collet on the end of the servo rod aft of the other side of the arm,this simply stops everything falling off.
To test the device fully open the throttle and note when the spring compresses fully,if the servo stalls out simply adjust the first collet so the spring has closed but at the same time opened the throttle fully without any effort,now close the throttle and once again note how the spring closes,once again adjust accordingly.
If more movement is required such as on older radio sets just fit a longer compression spring.
All that is happening is that the spring is acting as a safety buffer, by not restricting the servo arms movement and thus avoiding the fatal stall out which will at the worst drain your battery and cause you to crash.
There was a commercial device which had a leaf spring attached directly to the servo arm thus causing the arm to give slightly when in the over-ride position.