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>> Home > Tags > brushless motor

brushless motor
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huntsman 46 by canabus Admiral   Posted: 8 hours ago
Hi Pilot If you are using 540 can size (35-36mm brushless motor) a 3639-1100kv 800watts, 3648-1450 1600watts or a XK 3674-1900 1769 watts. All run on 100Amp ESCs, but check the maximum voltage they handle. I use car ESCs with the electric fan on top because they run cooler at slow speeds and no water plumbing required. The same with the motors no cooling. Props for these motors 37mm 2 blade or 40-45 mm 2 blade. If you go for a larger motor for a larger prop, a L5055-700kv 1600watts same ESC, but, start with a 2 blade prop about 52mm. Battery a 3-6S 5800mah or more with a C rating of 40 plus. I have used the 35mm motors in 34 to 40" boats, but, for my 46" Vosper Crash Tender I am going to the 5055. To large a prop will cause over heating of the ESC, battery and Motor. A in line amp meter(Hobbyking 9598000004-0) is the one in use. It reads the maximum amps, so for run speed amps slow speed up to maximum as a hit the throttle hard will give you maximum amps. Canabus

46" Firefloat What Motor/Battery by jarvo Fleet Admiral!   Posted: 2 days ago
Hi JJ. Just a word of warning, your Mtronics esc will not work with brushless motors, also 20amps is close to its limit with twin motors and fairly large props, performance wise, brushless is the way to go, but will need 2 esc's, wont run with one, if your dropping hints to the elves, spec your motors at about 700 watts and 600-700kva great torque with good revs at 7.2v even better at 12v Mark

46" Firefloat What Motor/Battery by moormedic Seaman   Posted: 2 days ago
Thanks again Will give that a try first and then perhaps see if Santa brings me some brushless motors 😁 Cheers J.J PS At the moment using a single ESC( 20A Mtronics) but would probably go for two if I move to brushless.

Hooligan Free by BOATSHED Commander   Posted: 2 days ago
Looks like a nice mod on her. I have one but wasn't happy with it as it didn't have a very good radio range. But did go quite well in the radio range she had. That should be a lot better now you have done this to her. I gave my brother one that I got from a boot fair that cost me a £5er. He ripped out the insides and has fitted it with a small brushless motor and 2.4gh radio and it is not so much a hooligan but more of a total maniac. But good fun.

MFA Piranha by BOATSHED Commander   Posted: 2 days ago
I have a MFA Piranha almost finished in my shed and a MFA Spearfish I purchased from a model shop in Cromer. That shut down not long after I purchased it. That's still in the box as new. I intend at some point to put in a brushless motor. I have one already. I got both Motor and Speed controller the same as in the ProBoat 29" Blackjack. I already have the ProBoat Miss Geico that is a maniac on the water. So I'm hoping once I do the Spearfish that will also be awesome.

46" Firefloat What Motor/Battery by jarvo Fleet Admiral!   Posted: 3 days ago
Hi J. Your motors are nominal voltage 7.2v. Try a single 7.2v 3300 NimH pack, quality from Component Shop. It will be short running time, powering 2 motors but will give you an idea of performance, then you could buy a second, 1 for each motor, if this did not work out or you want more performance then go for brushless motors, still with the 2 battery packs. I would try the single pack first, suck it and see, develop it from there without breaking the bank!!!! Cant see any ESC, have you got 1 or 2? if 1 use a 'Y' lead to connect the second battery. Mark

46" Firefloat What Motor/Battery by jarvo Fleet Admiral!   Posted: 3 days ago
HI JJ. Your question about a safety bag, Damaged / overcharged lipo's can catch fire, think of the Boeing scandal that grounded the fleet last year. Charging in a safety bag is advised the bag is fire retardant material, which will contain any problem. Your remarks about the boat not coming onto the plane is down to the weight of the battery, my fireboat started with 7.2v NimH packs 1 for each motor, Graupner 700bb's, good cruise but not quick, but short run time, 10mins. I have re-wired to allow 3s lipo's, but not had chance to test it yet, but should go like stink. With a fast hull, weight is important, 4 x lipo packs, 1kg, half the weight and possibly 6 times the power delivery. In your first post you mention 600 motors on 6volts, they are probably rated at 8.4volts, same as my 700's hence the lack of performance, also the battery, at 12ah it should last about 30mins, was it fully charged??? and is it showing at least 6volts, ie not got a duff cell??? Canabus, in his post described an ideal set up with brushless motors, 1600 watts is just over 2 hp, 750 per horsepower so you can see the difference in performance with different motors and battery set up's

46" Firefloat What Motor/Battery by canabus Admiral   Posted: 3 days ago
Hi What type of props are you using(size and number of blades). I see your basic problem is under powered motors and a very heavy battery. I made the big switch over three years ago from brush to brushless motors and to Lipo batteries. With the help on the forum and club members it was a learning curve, but, I would not go back. A 5800mah Lipo battery is in the weight of 450 to 570 grams and would give you a good 1/2 hour run time. A good balance charger and safety bag are the main requirements, also maximum charging for the 5800mah battery is 5.8 Amps(same as the old Nicads). Also a low voltage battery alarm. Your 600 motors can draw up to12Amps !!! Replacement same size motors for your mounts would be 35mm brushless motors, but, you will require two ESCs with a Y connector to run on the same throttle channel. Replacement brushless motors are far more powerful e.g. a Hobbyking 3639-1100kv with a 60Amp ESC on a 4S 5800mah Lipo Battery is 800watts and with two in your boat is 1600 watts!!! Your old motor would in the 100 watt each mark !! I have the same size crash tender, but, with a single brushless motor. I have all the order numbers for the motors etc. and a setup the ESCs if your require. Canabus

46" Firefloat What Motor/Battery by moormedic Seaman   Posted: 4 days ago
Hello chaps. I'm very new to this but have just finished scratch building a 46" Vosper Firefloat in the old Aerokits fashion (ie all wood) to the point where I've primered it, fitted a radio and couple of motors (Graupner 600 chosen at random cos they looked adequate!) and a Lead Acid 6v 12Ahr battery. Tried it on the local canal today and two problems. 1: its underpowered...nearly gets on the plane with a fresh battery but not quite. 2: The battery only lasts about five minutes. I'm an old git and don't understand "Lipids" or the benefits of "Brushless Motors" etc and would appreciate any help or advice any of you experienced guys could offer me please on motor/battery choices to get the thing planing and running for more than five minutes. Many thanks in anticipation Cheers John

Sea Queen Prop shaft by Dave M Fleet Admiral!   Posted: 4 days ago
Hi AndyG Not sure what type of coupling was supplied but I use a common Universal coupling on my 48" Sea Queen and use a brushless 42 size 850Kv water cooled motor of 700 watts and it is happy driving a Prop Shop prop of 42mm at 45 amp on full throttle. Power is from an 11.1v Lipo of at least 2200 mA but Nimhs would work, just not as fast and less duration. My motor is mounted in the main cabin and I have no problem with the prop shaft. Originally designed for IC power so perhaps you have heard of problems when we used such powerful and not so well controlled devices. My model goes on the plane very easily and any more power would make it unstable. Pics attached to show my set up. You can just see the coupling in front of the motor.

Sea Queen Prop shaft by AndyG009 Chief Petty Officer   Posted: 4 days ago
Hi all Have purchased a Sea Queen kit, and after getting info from this site plan to fit a brushless motor and Lipo's. Have been advised to change coupling from supplied, for one that will take the power - comments please. Also is there likely to be problems with more power going through the long M4 prop shaft ? I would rathersolve problems now before boat is built, so any help would be useful.

Richards 48" Swordsman by olly49 Chief Petty Officer   Posted: 9 days ago
I bought and built my Huntsman back in the late 70's. Decided last year to refurbish her. She is powered by a T600 brushless motor, 2 11.1 v lipos these are positioned midships, x50mm prop, tends to start bow down but when on the plane she looks a beautiful sight. I must say of all the boats I have this is the favorite one.👍

Veron Vosper RTTL 28" by Skydive130 Admiral   Posted: 9 days ago
The plans are lovely! Really remind me of my keilkraft days as a nipper! Obviously the model was designed when ic motors where the norm, however with the advent of brushless motors and limo batteries, it now gives us the chance to rebuild these classics from yesteryear with cheap electronics! I think motor, esc, lipo and prop shaft cost about £30, wood another £30 odd, a few odds n ends from the spares box, should have a nice vintage model built for less than £80 allowing for any minor purchases! Will start building again Wednesday, watch this space!

Motor problem by canabus Admiral   Posted: 9 days ago
HI Richard I drop my prop angle to 9 and 1/2 degrees on my Precedent Huntsman 34" after removing the old IC motor. Running a 35 mm brushless motor on 3S and it's very quick!! More a speed motor than a motor cruiser. Canabus

Motor problem by canabus Admiral   Posted: 16 days ago
Hi I use a Turnigy 180Amp watt meter and power analyzer(part No.9598000004-0) 0-60 volts , size 85 x 42 x 25mm, 82 grams. Requires your battery connectors. Use it in line with the main battery on board the boat. We used it on my mate's Spearfish and got 72.88 Amps on a brushless motor at 37 KPH. Canabus