Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length.

[howie55]

Hi  everyone I have a Mtronics motor M500 , and a 7.4v1500 mAh battery, if these are compatible, I would also need to know what kind of speed controller I will need to give me a get me out of trouble for reverse and forward control on the motor, l have a 58 “ long by 15” beam yacht based on a VO 60 ocean racer, I have a 35mm prop in situ
Any help would be great
Geoff ( Howie 55

[Martin (Admin)]

Mtroniks M500 Technical Specification:

Motor Type                Brushed
Motor size                 500
RPM@12.0V             9250
Stall current @12V    8.45A
Shaft diameter          3.17mm
Length                     56.0mm
Diameter                  35.8mm
Weight                     167.0g
 
https://www.mtroniks.net/prod/Motors-For-RC-Boats/M500.htm#description


So anything 10AMps and above should do it:
https://www.mtroniks.net/cat/Boat-Speed-Controls
 

[Akira]

As martin's spec sheet indicates, you have a bit of a mismatch between your motor and your battery. First is the voltage. Your pack will not allow that motor to turn up and give you the speed you want. second is the battery capacity. While the stall current is 8.5 amps, I would expect t that the running amps to be around 2. With a 1500mah (1.5 amp) battery that does not give you much in the way of capacity, ie, very short run times. Given the size of your boat, you could easily increase your battery pack size.

[howie55]

Hi Akita
Thank you for your reply, the yacht has been fitted with the M500 motor, I chose it for its slow speed, I was given the battery but did not take into account the running time, do you have any suggestions for a new battery
Regards Geoff

[Abandon Ship]

Hi Howie, If Akira's estimate of 2A while running is correct you should get about 45 mins of run time from a good 1500mah battery. If it's had some use before you got it, it may have lost some capacity so say about half an hour. How much 'trouble' do you expect to get in for a single sailing session?


I would suggest using what you have and try it out before you get into trouble so you know what run time you get.


Dave

[howie55]

Thanks for replying Dave, I will fit the wiring system in, and then fill the bath and try it out with a fully charged battery and let it run, will let you know the result, it will also be the first time it’s been in the water so will check for leaks and prop shaft seal, rudder seal
Regards Geoff