kyosho seawind - RC Groups
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Dec 23, 2010, 11:07 AM
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Robert Pulse's Avatar

kyosho seawind

I just bought a seawind kit and have been looking at different threads about the kit. Question The kit calls for a futaba 3801 sail servo, that is discontinued. The 3802 lacks the power of the 3801. So what is recomended for a good drop in replacement?

Oh yes it is here somewhere I just havent found it
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Dec 23, 2010, 11:20 AM
Norman2's Avatar
Look at the site and find HiTec Hi torque servo. Model Number is
HS-645 MG. This is what I use in my 36/600 and AC100 sailboats. Regards
Dec 23, 2010, 12:33 PM
Registered User
seefest's Avatar
For boats with 600 Square inches of sail, you typically need around 200 oz-in. I would go with the Hitec HS755MG.
Dec 23, 2010, 01:31 PM
Registered User
Robert Pulse's Avatar

seawind servo

So the hitec will drop in, in place of the 3801? Same size?
Dec 23, 2010, 01:34 PM
Boomer1's Avatar

Servo suggestions and hatch upgrade

I have included a picture of the servos I am using. I have had this boat in extreme wind conditions and had no difficulties in pulling the sails. The rudder servo works great as well.

You can still get S3801s off the web. I got one a fews months ago at a fair price from (do a search for the part number.) Edited 9/10/13 Sadly these have become nearly impossible to find. Possible replacement is the HS 755MG.

I upgraded the stock hatch with the one in the picture. The fellow who makes them sells them on E-bay. Nice looking and they work great.

I made two other modifications you may wish to consider. The first was to replace the string rigging and install 30 or 45 lb test 1 x 7 strand SS nylon coated leader and SS adjustable turnbuckles. Pictures are also included. The other modification was simplify the factory sail management system. I replaced their method with a slightly simpler method. (See the photo- it shows the modification)

Congrats on the new boat!! You will enjoy it.


Hatch upgrade
Edited 9/10/13 Sadley this items is no longer made.

SS Surflon leader = C045T-4 SS leader and sleeves = S3, 4, 4L Bright (clear)
Google search should provide multiple suppliers

SS Turnbuckles (called rigging screws #030-030) go to: https://www.radioyachtsuppliesaustra...ter-Image.html

Pekabe 482 rigging screw go to:
Last edited by Boomer1; Sep 10, 2013 at 11:23 AM.
Dec 23, 2010, 01:47 PM
Registered User
thorsail's Avatar
Hi Robert
if you need to compare physical dimensions of servos the info will be on
the company websites......
but I like this site for info on every servo known to man

Dec 23, 2010, 07:58 PM
Registered User
The Hitec HS765HB is the same size and has the slightly better specs. The price is about the same as the old 3801.

Check out the SeaWind forum for more information than you will probably ever need:

Dec 27, 2010, 12:42 PM
Registered User
Robert Pulse's Avatar

custom sails

Any body make custom sails for the seawind?

Dec 27, 2010, 03:36 PM
Registered User
Dick L.'s Avatar
if you are planning to race - be aware of class rules:

12.1 Sails shall be provided in the kit, Replacement sails shall be those supplied by the kit
12.2 Corners of the sails may be reinforced not to exceed 3 inches from the corner of the
13.1 Batten length and placement shall be as defined in the kit instructions. Alternative
materials of uniform cross-section may be used.
Dec 27, 2010, 04:21 PM
Registered User
Robert Pulse's Avatar

custom sails

I am looking for a set for when I am not racing, for free runs. I will be keeping the kit sails if I race.
Dec 28, 2010, 03:04 AM
Registered User
Stockmaritime in Germany make some , look here and check out the video;

Dec 28, 2010, 12:46 PM
If it floats....sail it!
FoamCrusher's Avatar
Carr Sails shows them on their price list. Some skippers in our club use Carr sails on their US1M's and they look to to be of excellent quality and are fast.

Dec 28, 2010, 01:04 PM
Registered User
Robert Pulse's Avatar

silk screen

Next hot question. Can I silk screen a design and the numbers on the stock sails and still comply with regulations?
Dec 28, 2010, 01:54 PM
Gutless wonder
Guz's Avatar
Dennis Desprois' of Walurs Sails also has Seawind sails
Dec 28, 2010, 03:54 PM
If it floats....sail it!
FoamCrusher's Avatar
Originally Posted by Robert Pulse
Next hot question. Can I silk screen a design and the numbers on the stock sails and still comply with regulations?
There are class rules for the location, size and font type of the numbers (assuming you register with the class secretary to get an official number), as well as the location of the Seawind class logo. See the class website for a diagram.

They can be stick-on sail cloth numbers that the sailmaker supplies at added cost, numbers you purchase on your own (See at $1 @ - remember you need four sets of numbers - one set for each side of the jib and main) or traced and filled in with a Magic-Marker (or waterproof equivalent). If you mess up you can "erase" with a little acetone and start over.

I have a US1M set of sails from Dennis and put on my own numbers by printing them out on a printer, placing them under the semi-transparent sailcloth, and tracing them on with a marker. That way there are no edges to disrupt the air flow over the smooth surface. These are excellent sails, but I had forgotten he will cut sails for any boat you want from your supplied dimensions. Not many people go to the expense of after market sails for a boat that is generally raced as a tightly controlled one-design class.

If you are not going to race with these after market sails, then why bother with numbers at all?

If it were me,,,,and it's not I would stick with the stock sails, get a class number (only $7) and either go with the stick-on or traced numbers. That way if you later decide to race or sell it to someone who does, then you have the correct numbers that look sharp and preserve the value of the boat/sails.


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