When selecting an ESC for a boat:
Decide if you want reverse, it will be rare that you will want to back-up since the water tends to flood into the boat, but it is used as a brake and small maneuvers.
Manufacturer suggested (MFG) motor limit is based on car applications and they all have different limits on the same current maximums, what ever they suggest, you can go a little lower. What is important is the Maximum Continuous current limit and the Spike current limit.
The motor determines the number of cells you plan to run, most of the motors best suited for boats can run 7 or more cells.

A 100 amp forward/60 amp reverse ESC, can run a 16 turn motor with direct drive on a 28" Semi-Vee ABS Plastic Hull. We tried a 14 turn on the same boat and it blew the 40 amp fuse.

The Dura Trax Streak is rated for 12 turn max, if you run two motors, your suppose to use some formula (turn + half) 12 + 6 = 18 turn max motors, then another formula if the motors are geared down, I don't know the formula, but I have run two 14 turns geared at 2:1 with this ESC.

Traxxas XL-1 can run two 19 or 22 turn in-line motors.

With single motor direct or geared applications, the motor you choose will most likely establish the number of cells. The Graupner 700 can run on 12 cells, an ESC than can handle this would be very expensive, I use a mechanical micro switch style or single on/off switch.
See Controls & Wiring for more information on this.

Pro Boat Waterproof W/Rev
(Riptide)

Motor Stock 540 or 550
Input: 5-10 cells (6-12 V)
Max Forward Current: 50 amps
Max Reverse Current: 20 amps
Weight: 89 g, Size: 42 x 47 x 13 mm
Programming: automatic
Sold at hobbyetc.com for $50
DuraTrax Streak
Forward only
One-Button Set-Up" Speed Control
MFG:  Motors 12 Turn and up
Voltage input: 4 to 10 cells (4.8-12V)
On-resistance: .004 Ohms Operating frequency:3500 Hz Maximum current: 300 Amps 
Weight: 2.1 oz. Case size: 1.64"L x 1.5"W x .66"H 
RX wire length: 10.5" Battery wire length: 4.5"
Tower has this for $40
Traxxas EVX Speed Control Marine

On-Resistance: (F).006 ohms (R).006 ohms Rated 
Has thermal Shutdown Protection
Case size: 1.75"W x 2.17"D x: .085"H Weight: 3.5 ounces
Tower price $130.00
Forward and reverse
One-Button Set-Up" Speed Control
MFG: Motor Limit: 19-27 Turns
Input Voltage: 12 cells (14.4V)

Maximum current: Reverse:160 amps
Braking: 320 amps
Continuous: 30 amps

DuraTrax Blast Forward/Reverse
Forward and Reverse
MFG: Motors 27 Turn ?
Voltage input: 5 to 7 cells (6-8.4V)
On-Resistance: 0.0125 to 0.025
Maximum current continuous:
Forward 140 Amps, Reverse 40 Amps

Weight: 2.6 oz. Case size:  1.7" long x 2.1" wide x .78" high
Not High Frequency, MOSFET Equipped
Motor wires (Blue -),(White +)
DuraTrax IntelliSpeed AutoSport
Forward only
One-Button Set-Up" Speed Control
MFG:  Motors 20 Turn and up
Voltage input: 6 to 7 cells (7.2-8.4V)
On-resistance: .007 Ohms
Maximum current continuous: 128 Amps, Peak: 440 Amps 
Weight: 55 grams, Case size: 1.64"L x 1.5"W x 1.16"H 
Tower has this for $25
Traxxas XL-1 
Forward and Reverse
MFG: Motors 17 Turn and up
Voltage input: 4 to 7 cells (4.8-8.4V)
Voltage Drop: 0.019
Maximum current continuous: 75 Amps, Peak: 100 Amps
Weight: 3.4 oz. Case size:  2.4" long x 1.5" wide x 1.4" high
Tower has this for $40

 

Futaba

ESC

BRAKE
 REVERSE

PROD.
DATES

UNIT SIZE

MIN. #
TURNS

WEIGHT

CAPACITY
VOLTAGE

CONT.

SURGE

DRAIN

MISC

MC5

FWD ONLY

1/80-12/84

2.71x1.73x0.95

N/A

4.40

6-7.2V @ 20A

N/A

N/A

OFF 50mA
ON 350mA

 

MC6

FWD ONLY

1/85-3/88

0.56x2.00x0.98
0.84x1.97x1.44

27

2.89

6-7.2V

40A

64A

N/A

2-PC W/ON-OFF SW

MC106

FWD ONLY

1/85-3/88

0.56x2.00x0.98
0.84x1.97x1.44

27

2.89

6-7.2V

40A

64A

N/A

2-PC W/ON-OFF SW

MC6B

NON PROPO REV

1/85-3/88

0.56x2.00x0.98
0.84x1.97x1.44

27

N/A

7.2V

40A

64A

N/A

2-PC W/ON-OFF SW, G plug

MC106B

NON PROPO REV

1/85-3/88

0.56x2.00x0.98
0.84x1.97x1.44

27

N/A

7.2V

40A

64A

N/A

2-PC W/ON-OFF SW, J plug

MC107

AIRPLANE

1987

1.39x2.08x0.81

19

2.12

7.2V

28A

60A

N/A

ON/OFF SW, AUTO CUTOFF

MC8

NON PROPO REV

1/85-11/87

1.45x2.67x0.89

27

3.03

7.2-8.4V

20A

30A

N/A

G plug

MC108

NON PROPO REV

1/85-11/87

1.45x2.67x0.89

27

3.03

7.2-8.4V

20A

30A

N/A

J plug

MC9

BRAKE

1/87-10/91

1.17x1.59x0.61

18

0.97

7.2-8.4V

150A

450A

N/A

W/ON-OFF SW, G plug

MC109

BRAKE

1/87-10/91

1.17x1.59x0.61

18

0.97

7.2-8.4V

150A

450A

N/A

W/ON-OFF SW, J plug

MC10

BRAKE

1/87-10/91

1.27x1.46x0.56

18

0.86

7.2-8.4V

75A

300A

N/A

W/ON-OFF SW, G plug

MC110

BRAKE

1/87-10/91

1.27x1.46x0.56

18

0.86

7.2-8.4V

75A

300A

N/A

W/ON-OFF SW

MC11/11B

NON PROPO REV

11/87-12/92

1.81x1.59x0.78

19

2.16

7.2-8.4V

130A

500A

0.0080

G PLUG

MC111/111B

NON PROPO REV

11/87-12/94

1.81x1.59x0.78

19

2.16

7.2-8.4V

130A

500A

0.0080

J PLUG

MC12

NON PROPO REV

11/87-3/92

1.81x1.59x0.78

27

2.00

7.2-8.4V

100A

400A

0.0090

G PLUG

MC112

NON PROPO REV

11/87-3/92

1.81x1.59x0.78

27

2.00

7.2-8.4V

100A

400A

0.0090

J PLUG

MC114H

HELI

10/91-PRES

1.21x1.45x0.60

11

1.66

8.4-9.6V

200A

400A

0.0040

 

MC116

BRAKE

10/91-12/95

1.43x1.56x0.62

11

1.40

7.2-8.4V

200A

800A

0.0035

 

MC210CB

NON PROPO REV

1/92-7/00

1.79x1.63x1.02

18

2.55

7.2-8.4V

142A

568A

0.0062

BUILT IN FUSE

MC230CR

PROPO REV

7/00-PRES

1.07x0.50x1.31

20

1.55

7.2-8.4V

90 FWD
45 REV

N/A

0.0035

HIGH FREQUENCY
HAS REV DISABLE

MC310CB

NON PROPO REV

DISC.

1.79x1.63x1.25

16

2.75

7.2v-8.4v

180A

720A

0.0037

INCL. 35A FUSE PROTECTOR

MC330CR

PROPO REV

7/00-PRES

1.07X0.50X1.31

13

1.59

7.2V-8.4V

200 FWD
100 REV

N/A

0.0100

HIGH FREQUENCY
HAS REV DISABLE

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