Hello,

I have been working on my retracts for my VQ bf-109 as I went to adjust the travel on them nothing happened. The travel adjustment works for the other channels but not for the gear. I am using a JR sx600 receiver. If anyone has any ideas what would cause this i would be more than happy!

Thanks
Brad

Brad,
The reason for that is because retract servos don't work in the same way as regular servos. A retract servo has 180° degrees of travel. It only goes from one side to the other. There isn't any way to "adjust" it's travel like you can with other servos. To adjust the travel of your retracts you need to do it in the manual setup of the retract itself. Either in the linkages or in the mechanism of the servo, but you won't be able to do it with your radio.

Ken

You know that big wheel with no holes in it that comes with servos that you always throw away? Well that's the one you need.

Drill holes to accommodate the amount of throw you need.

All of those round ones I have gotten have had holes in them, bunches of them... Seems one would have to be careful in drilling the holes to be even distance, no? Is there a process for hole placement to get the holes where you need them? Thanks

Ah i see thank you very much!

To further what Mike said "holes where you need them"

Examine the actual retract mechanisim. You will notice the pushrod from the servo moves a rod from full up and locked to full down and locked. If the rod's full range of travel is 1" then you drill the two holes so they are 180 degrees apart on the wheel, and 1" apart with a line between the two going through the center of the servo screw. Substitute whatever measurement that your mechanisim uses and you will have perfect retract servo throw.