Hello goog people,
I have purchased the above yacht and I find it needs 3 servos. The rudder servo is no problem, I am confident that I can find a cheaper replacement, however, on this yacht the sail servo is in fact 2 servos in parallel. I have looked at the graupner part numbers and the first reaction is "ouch" £75 each. So I have looked at replacement servos, as the originals have a torque spec. of 5.0Kg/cm and there are 2 of them, then I need 2 with identical torque (cheaper) or 1 with 10Kg/cm or more. The servos are carried in a specially designed cradle, so I need to find two cheaper ones or one with double the torque but which will have the same body dimension as a single. This yacht, being of German manufacture, the spec indicates that the sail area is approx. 0.47 square meter. Would you agree that they have over engineered the required torque and I would get away with a less spec of servo?(cheaper).
This is my first yacht and I have trawled the net looking for info on this subject; ie, "A 1 mtr yacht with sail area of 0.5M squared in a force 3 wind needs a servo of 6.5Kg/cm". I have found many sites with info on how to design hulls, design sails and other aspects of yachting, but nothing about the torque needed for the sail servo.
I would be grateful for any advice and if this information is indeed on the net, then the net address would be welcomed.
Thank you,
regards,
derfledermause.