The original Seawinds were specified with a Futaba S3801 sail servo - Sadly, these were discontinued many years ago. They can be found on line once in a while and are worth whatever the sell price! Kyosho is using a similar servo which has the same spline as the Futaba S3801 - The Kyosho catalog # 82277 KS9071-20SW Waterproof Sail servo](https://www.kyoshoamerica.com Sells for around $65.00
There are a number of viable options out there
The rudder servo was spec’d Futaba S3004 - I posted a picture of one of my Seawinds with the original Futaba Servos.
Here are the spec’s for the S3801 - use these spec’s to shop for a replacement servo.
|Torque:|4.8V: 156.00 oz-in (11.23 kg-cm) 6.0V: 194.00 oz-in (13.97 kg-cm)|
|Speed:|4.8V: 0.30 sec/60° 6.0V: 0.26 sec/60°|
|Weight:|3.77 oz (107.0 g)|
|Dimensions:|Length:2.32 in (58.9 mm) Width:1.14 in (29.0 mm) Height:1.97 in (50.0 mm)|
I hope this information is of value. Post any questions you may still have.