Model Boat Mayhem

Technical, Techniques, Hints, and Tips => Radio Equipment => Topic started by: RipSlider on July 05, 2008, 08:04:52 pm

Title: Can anyone recommend a hi-torque but fast servo?
Post by: RipSlider on July 05, 2008, 08:04:52 pm

Hello all.

Been scanning the servo makers web sites, but having trouble finding what I want.

I'm looking for a hi-toque servo - preferably 15kg or more, that is also fast. Not too fussed if it's digital, but metal gears preferred.

Anywho know of a source? It would seem that you have to trade torque for speed, and I'm being greedy and wanting both..

Steve

Title: Re: Can anyone recommend a hi-torque but fast servo?
Post by: Stavros on July 05, 2008, 11:47:00 pm

Hi Steve what do you want to do with it give us all a clue them probably we can help......we hope!!!




Stavros

Title: Re: Can anyone recommend a hi-torque but fast servo?
Post by: JayDee on July 06, 2008, 12:31:30 am

Hello Steve,

Have a look at the Hitec HS 805BB, or the HS 815BB, both of them are VERY strong on 6 volts,
Depends on how fast  you need !!.

John.  O0

Title: Re: Can anyone recommend a hi-torque but fast servo?
Post by: Martin (Admin) on July 06, 2008, 01:15:52 am

(http://www.modelboatmayhem.co.uk/forum/adverts2008/SteveWebb.gif)

                                   http://www.servoshop.co.uk/ (http://www.servoshop.co.uk/)

Title: Re: Can anyone recommend a hi-torque but fast servo?
Post by: tigertiger on July 06, 2008, 03:50:58 am

I can recomend HS 815bb. about 25kg on 6v.
about 30 quid, but it is significantly bigger than normal servo.

But if you want real speed you need to look at some of the futaba sail arm servos, but the fast ones are about 3-4 times the price.

Title: Re: Can anyone recommend a hi-torque but fast servo?
Post by: HS93 (RIP) on July 06, 2008, 08:45:35 am

the car boys use these. as they need fast powerfull accurate servos oh and they need to be small and have metal gears

Futaba S9402 HIgh speed

but you get what you pay for

http://www.servoshop.co.uk/index.php?pid=FUTS9402&area=Servo

http://demonpowerproducts.co.uk/product_info.php?cPath=25_54&products_id=444

Title: Re: Can anyone recommend a hi-torque but fast servo?
Post by: RipSlider on July 07, 2008, 04:36:55 pm

Quote from: Stavros on July 05, 2008, 11:47:00 pm

Hi Steve what do you want to do with it give us all a clue them probably we can help......we hope!!!

Stavros

Stavros:

I want to have a play with using dynamic counter-balancing. I have a couple of very shoddy foamglass hulls to play with. The idea is to mount a weight ( lets say 1/2kg ) on a springy bar that projects out of the top of the boat.  The deafult position is that the bar points forwards, towards the bow of the boat.

This is lnked to a a servo, which is then linked to a mixer, which mixes with the rudder.

When the boat goes into a sharp left turn, it naturally rolls over, increasing wetted surface. So if the bar swings out to the right. After some fiddling with the mixer, the boat then stays vertical and wetted area is reduced. Obviously adds more pressure to the rudder, but hey ho.

It'll look ugly, but it's only to test the concept. There is a "cunning plan" in the works, but need to test some idea's out first before I go off building a proper model and this is one of them.

Thanks to all for the advice. I will have a look at each of them.

Steve

Title: Re: Can anyone recommend a hi-torque but fast servo?
Post by: offshore1987 on July 07, 2008, 10:46:29 pm

I have 2 Hitec HS-5955TG servos and i think they are awesome  :)

cant go wronge with them really

all the best