The Shipyard ( Dry Dock ): Builds & Questions > Working Vessels
Engines and Bec, Happy Hunter
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Bosse:
Which motors, names and numbers, brushed fit the Happy Hunter and which bec as well??
Kind regards from the builder, Bo Nilsson.
Martin (Admin):
It's a big boat but doesn't really need huge motors, Krick recommend '700' size motors:
https://www.krickshop.de/Electronics-Motors/Engines-Electric-Motors/Electric-Motors/MAX-Power-700-Electric-Motor.htm?shop=krick_e&SessionId=&a=article&ProdNr=42256&p=354
Technical Specifications
Description MAX Power 700
Item No. 42256
Idle speed at voltage 9,000 rpm at 18 V
Voltage range 9.6 - 24 V
No-load current 0.8 A
Current at max. efficiency 3 A
Load speed at max. efficiency 5000 rpm at 12 V
Blocking current consumption 23 A
Shaft 5 x14 mm (diameter x length)
Total length 83 mm
Go Brushless?!
https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313&_nkw=390919243117&_sacat=0
canabus:
Hi Bosse
If going brushless motors divide the required rpm by the voltage which gives you the KV motor you require.
EG 9000 divided by 11.1volts equals 810 KV.
Note brushless motors require one ESC per motor and are more powerful than brush motors.
Also Lipo batteries required because because of the higher power usage.
Canabus
JimG:
--- Quote from: canabus on August 08, 2022, 12:26:03 pm ---Hi Bosse
Note brushless motors require one ESC per motor and are more powerful than brush motors.
Also Lipo batteries required because because of the higher power usage.
Canabus
--- End quote ---
Brushless motors are not necessarily more powerful than a brushed one. They are more efficient so can produce the same power in a smaller size. The power is decided by the voltage input and the load, in this case the propellor. If you take the equivalent motors and connect to the same prop then they will provide the same power. There is no need to use LiPo batteries, NiMh or Lead acid can be used to provide the power and work just as well, they will however be heavier. Many people tend to think of brushless motors as only used in fast boats so need high currents from the batteries. By choosing the appropriate kV rating they work just as well in slow scale boats where high currents are not needed. The main advantage of brushless motors is because they are more efficient and less energy is wasted as heat in the motor they will give increased running time on the same battery. (Of course without the sparking from the brush gear they are electrically quieter and don't need capacitors fitted to reduce interference, also no commutator wear and carboning up increasing the heat produced.)
Jim
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