Question: Can I adjust the length of the control rods in my model? I want to use my existing servos and shift one servo slightly and when I do that the rods seem slightly too long. What should I do?
Answer: Most VMAR models use an inner and outer plastic rod system for the control rods. At each end, the plastic inner rod usually couples to a threaded metal rod which in turn connects to a clevis.
1) Slightly Longer Control Rods: You can make the control rods slightly longer by adjusting the position of the clevis on the threaded metal rod at each end. Do not over do it or the clevis could come off under load. Tug test to ensure you have a secure coupling after any adjustment.
2) Much Longer Control Rods: You will need to change either the metal threaded rods at each end (we have these in stock in various lengths) OR cut the inner plastic rod and splice an additional piece of the splined plastic rod into place. Use 2mm threaded metal studs as couplers. Tug test to ensure you have a secure coupling after any such modification.
3) Shorter Control Rods: You can make the control rods slightly shorter by adjusting the position of the clevis on the threaded metal rod at each end. Tug test to ensure you have a secure coupling after any adjustment.
To further reduce the control rod length:
- From one end of the rod, unscrew the clevis and threaded stud.
- Use a pair of scissors or snips to cut the plastic rod to the shorter length you required.
- Thread the stud and clevis back onto the plastic rod.
- Tug test to ensure you have a secure coupling.
4) If in any doubt about the security of any coupling, unthread the clevis and wick thin CA into the coupling between the stud and the plastic tube. Do not get CA into the clevis threads.
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