Knight Star

I am working on a Robbe Happy Hunter and need some suggestions for the main drive motors. It is currently set up to run with two 755/40 direct drive motors with a Model Control Devices SC480 speed controller. It will just not run slow enough. This may also help with the slow speed frequency noises I asked about last week. I am thinking about putting in some gearboxes or belt drives to reduce the driveshaft RPM. I have looked at some Robbe and Aeronaut gearboxes but not sure what is best. Any suggestions? What about gearbox noise? I have already installed the Robbe hardware so I may have to work within some limitations with drive shaft angle and location. Thanks in advance.

bigford

knight

i have two happy hunters,both in the drydock right now but as i understand
the robbe set up is the way to go. i think your problem might be the speed control!
are you useing one esc for both motors? these 755/40 are slow spinning motors
ive seen a hunter spin its prop so slow you could keep track of one prop blade

Knight Star

Well it may be the speed control and that would make the drivetrain much simpler. Any recommendations on a ESC? How about a Novak Super Duty? Should I be using a ESC for each motor?

bigford

knight

mine havent hit the water yet but i will be using two mtroniks viper 25's or 40's
there pircey but i was told there the best esc's for boats.
unless your looking for raw brute power i would leave the direct drive set up alone
here is a pic of one of the guys from the u.k. pulling at least a 750 pound boat


my understanding is that car esc's are not good for slow speed work that a tug dose
nobody ever putts around with car they hit the gas and go full throttle. a tug will spend
most of its time at a slow crawl or 1/3 throttle