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**Bunkerbarge** · 27-01-2008

You should set the servo to it's mid position, ideally by using the transmitter with the trim switches in the mid position as well but if you don't have a transmitter available you will have to rotate the servo by hand fully anti clockwise and then fully clockwise to identify the mid point.

When you have the mid point the servo arm should be set on the splines at a 90 degree position and the horns on the rudders should be set at 90 degrees. You then have the lengths of the linkages you need.

I would use use ball and socket joints on the linkages to ensure that all linkage lengths can be adjusted to give the perfect mid position of the rudders when you have finished.

If you have got all the neutral points in the mid positions you will always be sure that the travel will be correct port and starboard.

Here is a link to a two rudder set up using one servo. I didn't use ball and socket joints for this because it is such a small model and I wanted to keep everything small and light. I did pay the price though and ended up with the rudders not perfectly aligned.

http://www.scale-models.co.uk/under-...ii-u-boat.html

27-01-2008	#4 (permalink)
Bunkerbarge Moderator Join Date: Jul 2005 Location: Halifax, Yorks: Nassau, Bahama's:Port Canaveral, USA: and all points in between. Real Name: Richard My Models: Robbe U-47, Deans Marine Cossack, Steam Coaster, Revell U-Boat, Motorcycles. Visit Bunkerbarge's Gallery Posts: 3,657 Images: 230	You should set the servo to it's mid position, ideally by using the transmitter with the trim switches in the mid position as well but if you don't have a transmitter available you will have to rotate the servo by hand fully anti clockwise and then fully clockwise to identify the mid point. When you have the mid point the servo arm should be set on the splines at a 90 degree position and the horns on the rudders should be set at 90 degrees. You then have the lengths of the linkages you need. I would use use ball and socket joints on the linkages to ensure that all linkage lengths can be adjusted to give the perfect mid position of the rudders when you have finished. If you have got all the neutral points in the mid positions you will always be sure that the travel will be correct port and starboard. Here is a link to a two rudder set up using one servo. I didn't use ball and socket joints for this because it is such a small model and I wanted to keep everything small and light. I did pay the price though and ended up with the rudders not perfectly aligned. http://www.scale-models.co.uk/under-...ii-u-boat.html __________________ “Dirty British coaster with a salt-caked smoke stack, Butting through the Channel in the mad March days"