Hi Seafarer, I have a few ships with rotating radars I have a few of these motors per the link below. They rotate quite well with one cell (1.4 volts) Gear Motor 3 - 224:1 90 Degree Shaft https://solarbotics.com/product/gm3/ I also have some of these, but they require a bit more vertical space. MFA 951 Series Motor and Gearbox 298:1 6volt (from CMB in the UK). I run these on 3 volts. Both are quite small. I have also used old servos in a couple of places.
Richard, If as you said each blade from shaft centreline to tip of blade is 30mm then it would not matter if you had two blades or ten. If the radius (your measurement) is 30mm then the diameter is 60mm. Perhaps you can remove the prop and place it on a flat surface so you can see the swept circumference when rotated.
Hi Richard, If each blade is 30mm from the shaft centre, it is a 60mm diameter propeller and is far too big for that size motor. For performance you need a larger motor say a Graupner 700 and I would still recommend a smaller propeller.
Hi John, Have you contacted Mtroniks about this at all. I have never received any answers to my email queries, but a friend of mine telephoned them with a query and they helped him. I agree with Dave and Doug too, but you have not yet told us if you have tried with a separate power supply to the Rx instead of the BEC.
John, Before you get any more ESCs here are a two basic things to try. 1. At the water's edge (on the stand) start the motors (both). Check their rotation. Then lower the boat into the water and see what happens. Either it should continue in the forward direction or it will stop and then go into reverse. Separately 2. Plug ESC into one radio channel and plug the other into another channel. This is a test - each ESC will be totally independent. Also we don't want use the BEC. I have had problems of a similar but slightly different nature with my Fairmile D previously, except that one of the motors would just stop after 15 or 20 seconds. Now I have each ESC running off a separate channel on the radio and the two channels are mixed so there is a master and slave channel and I use the single throttle stick to operate it. It works fine.
Hi Tica, From the question posed it was a sensible proposal. Please don't give up on offering help. I was not aware that RC gear needed to be set up for brushed motors or otherwise. I use mine for both brushed and brushless applications and I also have electronic ESCs as well as the old variable resistor types.
Another thought - The main difference between the bench and the water is the load on the system - ie increase in amps. This load may cause the reduction in signal and into failsafe? What size propellers are in use? Maybe a test with smaller props. I would also test without the BEC.
Hi John, I have a several MTroniks ESCs. If you have the Plug & Play type, then when you first start you need to move the stick forwards and then back. I find that sometimes they refuse to go forward and prefer reverse when the stick is moved forward, so I move the stick backwards first. This usually works (although I don't know why). I do not use the BEC (my choice). I have also had issues with using a single 30Amp Tio ESC running two 12V motors via the single ESC in my Vosper MTB. No answers from MTroniks. Regards
Both Fairmile D boats 1/24 scale and are scratch built. They have both been about 6 years in operation. MGB623 is an MGB, flying the Norwegian flag and belongs to a good friend. Mine is MTB741. It is powered by 2 Graupner Speed 700 12V motors with NiMH batteries. The 6 pdrs and 20mm guns can rotate. It has a balsa planked hull and fibreglass skin. Decks and superstructure are also balsa. Guns are from tinplate and brass.
The rather new Graupner Brushless Speed series motors don't have any Amp ratings or Watts in their specifications. Has anyone had any experience with these motors. I am interested in Amps and Watts of these motors, so i can obtain the correct ESCs. Thanks
An excellent discussion with very valid arguments. I have always had my twin shaft/prop vessels with outward turning propellers, but I will now reverse one of them to inwards turning to see how much difference it makes. Always learning...
HMS Triumph - Trafalgar Class Submarine at Albert Park Lake, Melbourne. There is a previous post with this submarine. It is scratch built and uses Engel piston tanks as its diving system. It has been in operation over 30 years. This is the first time it has carried a camera.
Thank-you. We use car drive belts to assist with launch and retrieval of the boats. They are easy to carry about, maintain their shape in the water and don't slip from under the hulls. these belts are about 900mm long so you won't have to bend far when launching.
The British Power Boat MGB 449 belongs to a good friend. The Vosper 73' Type I MTB is scratch-built in 2016 and took 6 months. Both boats are 1/24 scale. The location is Albert Park lake in Melbourne, Australia
Both boats are 1/24 scale The E boat belongs to a good friend. It has just had a new camouflage pattern added. The Fairmile D is scratch-built, it took nearly 4 years to build, launched in 2011. The sound effects were added for fun. The location is Albert Park lake in Melbourne, Australia