Model Boat Mayhem

The Shipyard ( Dry Dock ): Builds & Questions => Yachts and Sail => Topic started by: periscope on December 05, 2009, 05:30:33 pm

Title: Another Victoria Question
Post by: periscope on December 05, 2009, 05:30:33 pm

Hi All,  I've got myself a Thunder Tiger Victoria - can someone please recommend a suitable sail winch servo - all my equipment is Hitec so I need to know which model I need.  Many thanks Guys,

Ian

Title: Re: Another Victoria Question
Post by: tigertiger on December 06, 2009, 02:42:26 am

For Victoria I would be inclined to use a sail arm servo.

If you want Hitec.
Hitec HS 645MG High Torque Servo has about 7.7kg/cm of torque at 4.8v and 9.6 kg torque at 6v.
About £25
It is a couple of mm bigger than the standard servos, and it should fit in the radio tray supplied without much cutting/filling.

I use a similar servo from Futaba on 6v. Does the job well.

Cheaper alternative
Hitec HS 635HB about £15. This will do the job, but not in stronger winds.

A good source for data on servos is here
http://alshobbies.com/shop/cat.php?id=566
Even if you don't buy from here. I have no connection with Al's Hobbies.

Title: Re: Another Victoria Question
Post by: periscope on December 06, 2009, 10:52:35 am

HI Tiger - Thanks for your quick reply - I take it that when you say a sail arm servo you mean using the long arm provided in the kit onto a servo as opposed to a sail winch (this is my first yacht)  I've been looking up some of the servo details and I'd figured out that I needed around 6 or 7 kg/cm so I reckon I'll take your advice on the HS 645MG - don't see much point in puishing my luck by being under rated then having to change the servo later.

Thanks Mate,

Ian

Title: Re: Another Victoria Question
Post by: tigertiger on December 06, 2009, 02:54:26 pm

The words Sail Winch are tricky.
To me a winch is a sail drum servo, but to others it includes the sail arm type winch servo.

I would use the arm.
They are simpler to fit, you don't need a tensioner (too stop the line hopping off the drum), they are smaller, much faster, and often cheaper.
They are also simpler to operate if you are a beginner.

You don't need the extra pull effect (torque) of multiple turns of a drum.
I.E. If the torque is 7kg/cm and the radius of the drum is 1 cm, you have 7kg of pull.
      If the sail arm is 3.5cm, you have 2kg of pull. Very roughly putting it.

Title: Re: Another Victoria Question
Post by: periscope on December 06, 2009, 04:18:56 pm

Thanks Tiger - that's the way I'll do it then. - I'll let you know how I get on after Christmas - I'm not allowed to start it until then. lol

Cheers,

Ian