Dear Funtime
I use this site to compare servo data.
http://www.alshobbies.com/shop/cat.php?id=1&Desc=They also do deals, I think they do a multi deal on the s148.
No connection justa a happy customer.
If you are looking at sails then you need either a sail arm servo or a sail winch servo. They are listed as such.
The data below was pulled from this site.
As PMK points out these are 'bog standard' servos.
S3003
Standard size economy servo for general applications.
Ideal for use with cars, power boats, yachts, electric and engine powered aircraft and helicopters.
Specifications
Dimensions:
40.4 x 19.8 x 36mm
Speed:
0.23 sec/60dg
Torque:
3.2 Kg/cm
Weight:
37.2g
S148
One of the most popular general purpose servos, it's reputation is second to none.
Ideal for use with cars, power boats, yachts, electric and engine powered aircraft and helicopters.
Specifications
Dimensions:
40.4 x 19.8 x 36mm
Speed @ 4.8v:
0.22 Sec/60dg
Speed @ 6.0v:
0.19 sec/60dg
Torque @ 4.8v:
3.0 Kg/cm
Torque @ 6.0v:
4.1 kg-cm
Weight:
44.4g