Doug, The 6volt battery is currently an NiMh battery not an SLA. The problem was that according to Mtroniks the minimum voltage to the ESC to adequately run the BEC connection is 6volts. That is why I was getting erratic control when the battery voltage was 5.6 volts. The action speed controller will work 2-12 volts and I am going to use a separate receiver battery as suggested by Dave Milbourn just to make sure. Regards Will
Help required please, I have two Graupner Jumbo 540 6volt motors in an eboat circa 1978, I had fitted an Mtroniks speed controller replacing the Bob's board only to find that when the voltage dropped below 6 volts down to 5.6 volts I was experiencing intermittent operation of the esc. I have been informed by Mtroniks that the minimum voltage for operation of the esc is 6volts. Graupner have also confirmed that the maximum voltage for the Jumbo 540 motors is 6 volts. Do I have any alternatives other than refitting the Bob's board?
[Score: 8/10] Capable of 6mph and a runtime of 60mins Single Propellor (3 Blade 25mm) Direct Drive to a 380 (3 Blade) Powered by NiMH (6v) 3Amp/h Batteries Controlled Through Mtronik 15 amp (5Amps) ESC - Comments: The boat is a Graupner kit from the late 1970s and has recently been updated with new Spektrum radio tx and Mtronik speed controller. and
[Score: 8/10] 34"/2500g Huntsman 31 Single Propellor (2 Blade X Type 45mm) Direct Drive to a 3548 1100kv (2 Blade X Type) Powered by LiPoly (11.1v) 5Amp/h Batteries Controlled Through Hobbyking car esc (50Amps) ESC - Comments: The boat is an original Modav kit built in the early 1980s fitted with anEnya 35bb111 and recently renovated and fitted with a brushless motor new prop shaft and electrics. Model is still to be completed windscreen and fittings still to complete. More photos I just need to add the anchor fittings and handrails. First launch planned for the 22Aug 2018. I have tried to keep as much of the original 1970s boat as possible.
[Score: 5/10] 36"/1500g S10 Twin Propellors (3 Blade) Direct Drive to a Graupner jumbo 540 (3 Blade) Powered by NiMH (6v) 3Amp/h Batteries Controlled Through Mtronik (10Amps) ESC - Comments: Built from a Vic Smeed plan in 1986, fibreglass hull, wood and plasticard and plasticard superstructure and various plastic, wood and metal fittings.