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I have a modav Huntsman 31, which heels over quite a lot on turns even after slowing down. I was looking at the chine spray rails at the rear of the boat (see picture) they do not dip below the outgoing angle of the hull as shown on the plan (see picture). Would a triangular fillet located under the existing chine strip to simulate the plan for a length along the hull from the transom improve the heeling over in turns?
[Score: 8/10] 48" HMS Crofton Capable of 4mph and a runtime of 60mins Single Propellor Geared to a Decaperm Powered by Lead Acid (6v) 8Amp/h Batteries Controlled Through Bobs board (5Amps) ESC - Comments: The model was built over an eighteen month period from 1987 to 1988. The plans were obtained from the MOD, along with photographs and info from many sources. The model has been constructed from wood,plastic and many household bits and pieces.
Doug, Thanks for the reply, as far as I was aware the S type plastic props were less pitch than the X type plastic props. If your 35 mm metal prop is 1.4 pitch then it is similar to the X35 plastic prop I used in the first video. I think I need to investigate diameters and pitch a little more. Last week running my Huntsman I had an X40 plastic prop on and it was too large and way too fast, a friend running a 34 inch fire launch runs an X 35 so I may go back to look at a 😎35 mm dia metal prop and look at the pitch. Regards Ian
Help required, I have just started to look again at this boat which I partly built the hull and upper works for many years ago from a model boats extra publication. Has anyone built this model as I have a number of questions re finishing the balsa hull, modern control and running gear for this model. It currently has a Graupner Jumbo 540 motor installed but nothing done to the balsa hull or upper works or control
Built originally in 1973 from a modav kit and powered by an Enya 35bbiii. Now running a 3548 brushless motor and 5800 3 cell lipo. Model in video was running an x35 prop with +/- 20 degrees of rudder, very sensitive on turns. Today's run was on x40 prop considerably faster with reduced rudder throw of +/- 15 degrees. Current draw was 30 amps max watts 376. Still too sensitive on turns.
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 1970s 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.