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[KOI]

Hi
I am building an aeronaut Queen and am curious about motor, battery and ESC.
In the spec, it says a 8.4V 3800 battery, speed 600 7.2v motor and 25amp esc. The prop is 40mm 3 blade.
What I cant understand is two things-
Would it be right that they suggest brushed motor as opposed to brushless when costs are not that different.
I also cant see what RPM would be needed to get the boat to plane

Any help or guidance on this would be much appreciated

[Martin (Admin)]

Hi Koi,

Unfortunately, this is still a tricky / grey area / experimental subject.

Very few boat kits come with specified Brushless option, which is disappointing seeing brushless technology has been around for quite some time now. Mind you, some modellers don't like the 'whine' that some brushless motors produce..... 

A good place to start is this great topic by AndrewH 
http://www.modelboatmayhem.co.uk/forum/index.php/topic,13538.msg130068.html#msg130068

( seems I need to re-embed the photos!  ) 

Also see:
http://www.modelboatmayhem.co.uk/forum/index.php/topic,42219.0.html
http://www.modelboatmayhem.co.uk/forum/index.php/topic,25309.msg248599.html#msg248599
http://www.modell-schiffbau.de/yachten-speed-funboote-bauberichte-f27/queen-von-aeronaut-t652.html
https://www.rcgroups.com/forums/showthread.php?1286343-Brushless-motors-for-boats
https://youtu.be/GNI4snZceU8

[Martin (Admin)]

Additional:

I've got the HobbyKing Aquaholic race boat, which roughly the same size ( but I'm guessing, considerably lighter! ), that comes fitted with a:

BL2815 Brushless Outrunner Motor For Quanum Aquaholic / Relentless Racing Boats.

Specs:
Kv (rpm/v): 1900
Weight: 132g
Max Voltage: 11.1V
Shaft Diameter: 5mm
Stator Dimensions: 28 x 15mm
Motor Length: 38mm
Motor Width: 39mm
Extended Shaft Length: 20mm

https://hobbyking.com/en_us/bl2815-brushless-outrunner-motor-for-quanum-aquaholic-relentless-racing-boats.html

[sparkey]

In mine I have a prop-drive 42-58 500kv outrunner from hobbyking with 80amp ESC running on 14.8v 4c 5000mah lipo,goes like stink and with an outrunner no need for water cooling for motor.
 

[Martin (Admin)]

What prop you spinning on that Sparky?

[Stavros]

Hi
I am building an aeronaut Queen and am curious about motor, battery and ESC.
In the spec, it says a 8.4V 3800 battery, speed 600 7.2v motor and 25amp esc. The prop is 40mm 3 blade.
What I cant understand is two things-
Would it be right that they suggest brushed motor as opposed to brushless when costs are not that different.
I also cant see what RPM would be needed to get the boat to plane

Any help or guidance on this would be much appreciated

Rpm at that voltage would be 15500




http://calbugs.com/http___homepage.ntlworld.com_edward.matthews_ddmbc_files_motors_graupner.pdf




Dave

[KOI]

Hi all, thanks for coming back, will have a look today at esc, motor and battery to go brushless. As I don't have any spare kit at the moment, will be a fresh set up so will probably go brushless. Any suggestions where to purchase for a good deal would be helpful.

[Stavros]

Component shop do a good range of brushless motors and esc


Dave

[sparkey]

Martin,I have a 50mm 3 blade brass.

[sparkey]

  Forgot to add,I got this set up from the guys who done the model boat trip down the Thames,forgot their names,it has been used by a lot of other guys as well and I have the same in my princess as well,so it is well tried and tested.   

[KOI]

Hi Sparkey, thanks again, will definitely look at going along the same lines

[Thornej]

Hi Sparky,


Greetings from downunder!


Thank you for the motor information.
What runtime do you get on the battery?


Thanks