All donations are securely managed through PayPal. Amounts donated are not published online.
Many thanks for your kind support.
Model Boats Website Team
March 2017: 7 people February 2017: 12 people January 2017: 37 people December 2016: 2 people November 2016: 2 people October 2016: 8 people September 2016: 4 people August 2016: 5 people July 2016: 4 people June 2016: 1 person May 2016: 1 person April 2016: 9 people March 2016: 5 people
I have upgrade my Palm Beach to run BL 28mm Kehrer Jet Motor: BL Roxxy 3656-06 1800KV with watercooling ESC: Water cooled Aquastar 120A. Battery: 2 pcs. Lipo 3S 25C 3700mA for balance and weight Palm Beach from Billing Boat on it's first test at Vallensbæk Modelskibs Klub water https://www.youtube.com/watch? v=8qBwleXQQ3E Regards Carsten
If brushless no you can't. If they are brushed motors it's possible but they need to be matched closely otherwise one will run faster than the other. Ideally you need to try the motors side by side measuring the current drawn and speed. If you have a local supplier with several motors available this may be possible but not on-line. The ESC will need to be able to supply (ideally) double the stall current of both motors. If this is not on the label with the motor you can connect one of them to your chosen battery with an ammeter in series and briefly grip the shaft between two pieces of wood and stop the motor. The reading when stopped is the stall current but this should be for a max of 1 second to avoid damaging the motor. Multiply this reading by four and that is the max amperage for the ESC. It may be cheaper to buy two ESC's and use a Y lead to connect to a single Rx channel. This will also lessen the effect of using two identical but possibly mismatched motors. Hope this helps Dave
Wooden structure model fishing boats. Was done on his knee at home in the kitchen from the remnants of plywood, balsa etc. Motor 1 pc 600 with water cooling, 1pc battery NiCd 3000 mA. Excellent handling characteristics. Even though it was not good at handling the water looks great.
Wooden structure submarine chasers of 70 years in service with Russia and East Germany. Cover with balsa and smeared with epoxy varnish. The model is equipped with two engines of 600 pcs, 2 pcs NiCd battery 3000 mA
It may be a transmitter/receiver problem or it may be in your drive setup that rears its ugly head once your on the water and your motor is under load. I had a similar problem with a twin motor setup which was fine out of the water but after 10 mins in the water I would lose drive to one or both props or one would slow down and just go round in circles (very embarrassing). I had no problem with radio setup so it had to be in the drive chain. I ended up changing both motors for ones with more armature poles, higher torque output and a different gear ratio. It also highlighted a problem with my first choice of battery which quite frankly were pants and used to produce similar symptoms as you describe. I now use Lipo power packs, they do have disadvantages but you can not knock the power to weight ratio. The main problem I was having appeared to be down to the 3 pole motors that were fine until they were under load, this caused the motors to overheat which in turn increases the current drain on the battery's, the net result is the motor starts to arch across the commutator and effectively becomes a dead short which in turn shuts down your ESC's or drains your battery's very quickly. As you probably know if this was to happen with Lipo's there would be no need for a smoke generator! Of course this only applies to brushed motors if you are using a brush-less motor then it will probably not help you.
Master-construction water scooter from Robbe. 2 pieces brushless motor, 2 pieces brushless controller, lithium-polymer battery 5000 mA. Amazing driveability, incredibly stable rate of around 60 kilometers per hour. Battery life in full power for about 15 minutes.
Master-construction water scooter from Robbe. 2 pieces brushless motor, 2 pieces brushless controller, lithium-polymer battery 5400 mA. Amazing driveability, incredibly stable rate of around 60 kilometers per hour. Battery life in full power for about 15 minutes.
All composite structures including skin semiscales yachts of 70 years. 2 pcs drive motor 600 with water cooling, 2 pcs NiCd battery šestičlánek. The construction according to plan. Very good driving characteristics.
Model ship of ABS and laminátu.Trup is used in the original construction. 2 pcs drive motors battery 2pc LiPol A brass propellers, lighting pole position lights, cabin. Starting anchors, hooting, lighting reflector ..
I have a large 4' Puffer purchased many years ago form Martins Models at an E Port show. Originally I tried lead but it became very heavy to carry. I modified mine by making three large sealed fibreglass containers in side the hull which were open at the base and had open portholes at the top exiting thro the hull sides. I now only need about 1lb of lead plus the 12v 12Ahr battery to ballast. Put the model in the water then add the battery and ballast, the boat sinks to the waterline. Take the battery and ballast out and the boat rises, lift with two straps and all the water drains leaving a light hull to carry. The pic shows the model in its lead ballast days.
thanks for the insights dave. will wait for other helpful advice but based from what you've said i already had some additional great inputs in mind. i'm also leaning into using SLA battery than LiPo. it's true that 20-30kms range is my goal but i don't mind achieving that for future plans. 1-3kms at first is not bad to start with.i also have a friend who is a "class A" amateur radio operator and he told me that we can make antennas to extend the range of the craft 😁 i'll try to look for an 800 brushed motors over the internet. thanks mate!
Hi Wellard I think we need a bit more info to give helpful advice. Electric or Gas depends on the noise level nuisance. May not be a problem for off shore use. Probably greater endurance than with electric but not as good for the speed you envisage. As speed is not important (3-4Km/h) then a brushed motor may be preferable to brushless. Generally the prop should be about the same diameter as the motor case. Larger props will require some form of reduction unit to reduce the load on the motor. Sounds like there will be plenty of room in the hulls to carry a good power source and as you are operating at some distance SLA is possibly better than say LiPo where discharge voltage is important. I think you may have a problem with the range (20-30Kms) as this is somewhat greater than the normal range of domestic RC sets. As you are off shore there may be additional problems with wave height as the signal may be obscured when the model is in a deep trough between waves. At the end of the day you need a motor prop battery combination that will move the craft thro the water at the required speed and last for the full duration of each sail. It's quite a large model and I suspect will need say two 800 size brushed motors to allow for wind/waves and current. I suggest you come back with your thoughts as you may have specific requirements to fit in with other equipment you are instaling. dave