Steering servo for o/b tunnel hull?

[Andris Golts]

Hi all running a 22'' Stark o/b tunnel with sv27 power head on 4s with a 6 v receiver batt dual pushrod steering arm . What oz/in torque servo rating do most set ups of this size require? At present im using a 77 oz/in servo which i suspect may be a bit under sized ? Regards Andris Golts.

[stifflkd]

I use a Savox 1251MG which is 125 oz-in @ 6V. It is powered by 2S LiFe, the torque may be a bit higher. Used on a T600 outrunner and S225 prop.

[Andris Golts]

Thanks for the great information . Regards Andris Golts.

[HTVboats]

With a 22" hull your not stressing a steering servo much and your 77oz torque is probably sufficient. On larger 29-32 inch tunnels with up to a 1515/1Y Neu I have used 130oz servos without issues. Going to larger 6S power and 1520 size motors I like at least 200oz for steering. Weight of the hull and speeds dictate the need for steering power. Way back in the day we used 60oz single servos on .21 Outboards without problems.
Mic