Hi 12Skipper,
Here are a few setups I've tried on my Dauntless. Hopefully this will at least help if you are leaning toward Dumas brass props, eventhough there are obvious differences in motors based on what I can find on the web:
Mabuchi 555
Nominal Voltage: 24V
Voltage Range: 9-30v
No Load RPM: 8,500
No Load Current: 0.18 amp
Stall Current: 9.0 amp
Speed 700BB Turbo 12v
Nominal Voltage: 12v
Voltage Range:7-19v
No Load RPM: 11,600
No Load Current: 2.0 amp
Stall Current: 43.0 amp
Finding the right setup can be like a nasty algebra equation, and I wasn't very good at math in school [:@].
My next setup trials will be with the 700BB motors, now that this forum has helped me solve my coupler issues
.
Good luck!
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# 1. PROPS: Dumas brass 1.75" 3-blade, counter-rotating
MOTORS: Mabuchi 555
VOLTAGE: 12
BATT: Two large gel cells
SPEED CONTROL: Micro-switches (full on - off - full reverse)
RESULT: For reference, this is the setup I was running for the picture attached to this post. Best bet if you'll be navigating around swimming kids at the lake, adequate for scale appearance and wake. Motors run cool. No water cooling needed. At least 2 full hours of run time.
DUCKS AT THE POND SAY: You may be able to sneak up on us since it's so quiet.
# 2. PROPS: Dumas brass 1.75" 3-blade, counter-rotating
MOTORS: Mabuchi 555
VOLTAGE: 14.4
BATT: Two 7.2 V
SPEED CONTROL: Novak/Traxxas EVX salvaged from r/c truck (i.e. not waterproof)
RESULT: About 10-20% faster than the 12v/gel cell setup above (guestimate). Much lighter, boat floats above waterline, turns on a dime. Motors run warm but don't overheat. Watercooling might help? 15-20 minute run time.
DUCKS AT THE POND SAY: It goes alot faster than we can swim, but we fly off before you can tag us.
# 3. PROPS: Dumas brass 2.0" 3-blade, counter-rotating
MOTORS: Mabuchi 555
VOLTAGE: 12
BATT: Two large gel cells
SPEED CONTROL: Micro-switches (full on - off - full reverse)
RESULT: About the same speed as setup #2, even with the weight of the gel batteries. Motors too hot to touch after about 15 minutes. Watercooling might help?
DUCKS AT THE POND SAY: That nasty melting motor smell tips us off before you get close.
# 4. PROPS: Dumas brass 2.0" 3-blade, counter-rotating
MOTORS: Mabuchi 555
VOLTAGE: 14.4
BATT: Two 7.2 V
SPEED CONTROL: Novak/Traxxas EVX salvaged from r/c truck (i.e. not waterproof)
RESULT: Never floated this setup. After #3 results, I'm afraid of melting the Mabuchi motors.
DUCKS AT THE POND SAY: You wuss!