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bogstandard · 21-02-2008

Alan,
Using that information, you would drive the prop direct, of a size around 50 to 55mm. Don't go for a fancy prop, just a standard x type racing plastic prop (keep the money in your pocket while playing about). According to the motor info you have, in theory, with a 12 volt 3 amp hour racing pack, you should get about 30 mins sailing, but with experience expect a little less.
For speed controller, I would go 50% up on stall current (about 35amp or above) and use 25 amp fuses in the power lines.

All this can only be guestimation on the info provided, the only real way to do it is get it in the water (not the porcelain test tank) and play about with prop settings and sizes, you might even find that going down to a smaller prop sometimes gives more speed, and extended running times, because the motor is running in a more efficient power band.

I hope this helps

John

21-02-2008	#10 (permalink)
bogstandard Scale Model Member Join Date: Jun 2006 Location: Crewe, Cheshire, UK Real Name: John Visit bogstandard's Gallery Posts: 120	Alan, Using that information, you would drive the prop direct, of a size around 50 to 55mm. Don't go for a fancy prop, just a standard x type racing plastic prop (keep the money in your pocket while playing about). According to the motor info you have, in theory, with a 12 volt 3 amp hour racing pack, you should get about 30 mins sailing, but with experience expect a little less. For speed controller, I would go 50% up on stall current (about 35amp or above) and use 25 amp fuses in the power lines. All this can only be guestimation on the info provided, the only real way to do it is get it in the water (not the porcelain test tank) and play about with prop settings and sizes, you might even find that going down to a smaller prop sometimes gives more speed, and extended running times, because the motor is running in a more efficient power band. I hope this helps John Last edited by bogstandard; 21-02-2008 at 03:28.