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[muduck]

For various reasons I wanted to convert her,all 36llb,(lots of Ballast) to electric & I wanted to try brushless.
Maiden voyage the other day & it's all I could hope for.
I have a 4 blade 70mm prop.
Motor:Turborix 850rpm/v D3648 RC 500 Helicopter Outrunner Brushless Motor
Escape: Hobbywing SEAKING 60A watercooled.
I run the whole lot on 6V.lead acid

Am currently waiting on a sound card from Model Solutions of Canada to give the "bling"
With the above sys I have stacks of power at low scale speeds.Of course, during trials I had to give her a "burst".....ever seen a tug  leap up on a plane

well worth the effort.

[muduck]

Just added a couple of vids on U tube..one chugging nicely, & one showing a turn of speed.
http://www.youtube.com/watch?v=ezwJLSQZU2Q


http://www.youtube.com/watch?v=bXc2FWSTJBA

[HS93 (RIP)]

that's going well, did you sell the steam plant I think I saw it up for sail somwhere ?

peter

[muduck]

Yes Peter...went back to the Northern Hemisphere..Denmark

[phillnjack]

ive just looked at a site that seels these motors.

it says 11.4 volts   and not to run for more than 5 mins then 2 mins off  !!!!

is it realy ok to run this on just 6 volts ? and for more than the recommended 5 mins ?

im asking as i like the look of these brushless motors


phill

[nick_75au]

Phill do you have a Link?

Running a motor at half its voltage reduces the power considerably, so the heat the motor has to dissipate is well within its limits. In a Heli application high power in low weight is required so no weight can be used for heat-sink and the cooling is non existent from prop wash therefore the duty cycle is reduced.

Nick

[phillnjack]

here is the link to what ive read.

http://www.r2hobbies.com/eng/proddetail.php?prod=rcps81521_850


hope i didnt read it wrong


phill

[nick_75au]

It looks to me as if the duty cycle was just for reliability testing, Keep it under 1000 Watts and that should be a continuous (off a battery/limited supply) rating
1000 watts at 14.4 volts is 70 amps, we are not going to reach that in a scale boat

This motor would be wasted on anything less than a 60 mm prop in a tug.
Nick

[muduck]

I have a water cooled controller, I run a small electric motor to drive it...The setup  I use has a 70mm prop, allup weight is about 35pounds..it's a 6V system, & has LOTS of Grunt..as a Tug should

[phillnjack]

Sounds like a real good set up
does running on 6 volts seem ok with the motor ?
would it not be better on 12 volt running finer pitch props for even more torque ?

i am asking has im not too up on the electric boats/tugs


phill

[muduck]

I'm running on6V for an hour at a time,motor purrs.....