Model Boat Mayhem

Dry Dock / Shipyard: Builds & Questions => Yachts and Sail R&D: => Topic started by: BlueWotsit on August 16, 2006, 05:25:42 PM

Title: Marbleheads
Post by: BlueWotsit on August 16, 2006, 05:25:42 PM

What type of servo is recommended for these.

Also can anyone give guidance on tuning the rigging

thanks

Title: Re: Marbleheads
Post by: cbr900 on August 17, 2006, 02:53:05 AM

Bluewotsit,

Any standard servo can be used in a marblehead for the rudder with no problems of any kind, but a winch servo is a must for control of the sails, there is a variety of winch servos around, I use GWS winch servos in most of my yachts with no problems, they are quite cheap and redily available...
Any other problems just holler..

Roy

Title: Re: Marbleheads
Post by: martin-R on August 18, 2006, 04:33:59 PM

 Marbleheads have a lot of sail area and even the big GWS servo will be underpowered. The Hitec HS815BB Servo will serve you better, although I think winches are preferred to sail-arm servos for these.

Title: Re: Marbleheads
Post by: BlueWotsit on August 18, 2006, 04:45:24 PM

From what Ive been reading this could be a difficult one to gauge as most people seem to have several sets of sails.

I agree that the winch is probably best

cheers

Title: Re: Marbleheads
Post by: BlueWotsit on August 18, 2006, 08:56:21 PM

Update - Ive got a Hitec winch installed and working - now to try and find some instructions on how to connect all the rigging lines, etc theres several more than on yachts Ive used before !!

Title: Re: Marbleheads
Post by: MikeK on August 19, 2006, 09:05:17 AM

Hi BW
Try this site for a help on info including winch line paths etc.

http://www.onemetre.net/

I know it is for one metre yachts but all the rigging is the same. As mentioned above the sail area on a Marbelhead is far too powerfull for a sail arm to control, but i see you have got a winch so that's ok
There might also ]be some useful leads on the MYA site as well at www.mya-uk.org.uk

Best regards
MikeK

Title: Re: Marbleheads
Post by: cbr900 on August 20, 2006, 02:01:12 AM

Martin,

The GWS winch is perfectly capable of operating the sails on a marblehead yacht with ease in any conditions we have about fifteen in our club that use GWS and no one has a problem, If you have had a problem maybe you had it set up incorrectly, I find that the hitec winch  will also work well but is better suited to an even bigger yacht...

Roy

Title: Re: Marbleheads
Post by: martin-R on August 20, 2006, 08:58:05 PM

Maybe I'm thinking of the wrong type of servo. For my 950 mm Saphir, which carries little more sail than an IOM C rig, I use the Supertec SO4 http://www.sussex-model-centre.co.uk/shopexd.asp?id=880 , which I believed was a GWS design. Even with a 5 cell pack, it has problems in really stiff breezes (bft 5 - 6). Your recomendations for a GWS with more torque would be appreciated, as their prices are better than for similarly rated Futaba/Hitec.
P.S. I've just seen the S777 on http://www.servohut.com/HTML/heavy.htm That's a real giant of a servo but the price is a bit much for my budget >:(

Title: Re: Marbleheads
Post by: cbr900 on August 23, 2006, 03:59:55 AM

The Winch Servo's that I am using are numberedS125 2BB, the seem to do the job well over here..

Roy