Boat Water
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2200kv Leopard 4082 brushless marine motor for RC boat V2 40mm water cool jacket |  |
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US $129.99 | 28d 4h 30m |
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aluminum water cooling jacket for B36 540 brushless motor for rc boat- silver | |
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US $12.99 | 28d 19h 52m |
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RC Boat (Automatic Water Absorption) Water Gear Pump DC4v - 12v + "Free" T-plug | |
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US $16.00 | 3h 33m |
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seaking-120A Water Cool Ship Brushless Motor Hobbywin ESC For rc boat hot sale.. | |
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US $75.90 | 29d 4h 36m |
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SEAKING 4800KV Brushless Motor W/Water-cooling for Boat 2040SL | |
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US $26.80 | 25d 18h 49m |
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75mm Silver Aluminium Water Cooling Boat ship Rudder for RC Boat | |
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US $7.19 | 22d 21h 30m |
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Vintage Dumas Rudder and water pickup for Pay-N-Pak .21 Hydroplane Boat kit | |
0 Bid | US $39.99 | 1d 2h 39m |
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RC Boats & Submarine ~ Water Gear Pump DCv 4v - 12v + "Free" T-plug Set | |
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US $14.99 | 12d 3h 47m |
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Xpower B36 540 550 Adjustable Alu. Brushless Motor Mount RC Boat Water Cooling | |
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US $1.56 | 13d 22h 21m |
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rc gas boat water pump | |
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US $22.11 | 11d 20h 38m |
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75mm RC Boat Rudder with Water Cooling - HARD ANODIZED | |
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US $7.50 | 22d 19h 30m |
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RADIO CONTROL MODEL BOAT Water Scoop Set | |
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US $3.14 | 25d 3h 31m |
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O.S. Max .21 marine boat nitro engine glow water cooled shaft or cable drive NR! | |
6 Bids | US $40.00 | 1d 18h 4m |
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151B71 125 Amp Water Cooled Brushless ESC Radio Remote RC Boat | |
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US $49.64 | 28d 15h 41m |
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120A ESC water cool electric speed controller for brushless motor -rc boat | |
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US $69.00 | 28d 17h 20m |
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Sea-king 50A Boat Speed Controller ESC reverse Ship Forward/Backward Water Cool | |
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US $22.80 | 29d 21h 11m |
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Aluminum water pickup dual New version rc boat | |
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US $6.00 | 27d 3h |
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RC Model Ship 55mm Water Stabilizer Boat Trim Fin TF515 | |
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US $10.90 | 28d 11h 52m |
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160mm rudder dual water pickup for 67-90/ 23-35 rc boat | |
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US $30.00 | 11d 18h 59m |
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Spartan Boat BRUSHLESS 540XL MOTOR with water motor cooling jacket Traxxas 5707 | |
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US $119.99 | 4d 5h 43m |
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95mm red Aluminium Water Cooling Boat ship Rudder for RC Boat | |
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US $9.29 | 22d 23h 24m |
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RC-Sub & Boat(Air,Gas,Liquid,Water)Micro Pump Type-B DC5v -13v+ Free JST - Plus | |
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US $23.99 | 11d 5h 13m |
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Aluminum 550 540 Water Cooling Jacket for RC Boat Ship | |
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US $11.49 | 15d 20h 43m |
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RC Submarine & Boat - MICRO Water & Air PUMP DC 3v - 7.4v + Free "JST" plug set | |
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US $24.99 | 25d 3h 25m |
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Pro Boat .18 Water Cooled RC Gas Nitro Marine Engine | |
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US $109.99 | 1d 10h 22m |
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Water-Cool Brushless Motor 60A ESC for RC boat with 5A BEC Free Shipping | |
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US $18.41 | 24d 5h 49m |
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Seaking-35A Waterproof Brushless ESC for Boats W/water-cooling system | |
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US $39.99 | 24d 14h 29m |
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Aluminium water outlets for RC Boat M6 thread with O-ring & screws aluminum | |
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US $2.80 | 15d 21h 11m |
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TRANSOM WATER PICKUP KIT GAS NITRO BOAT 5mm 3mm 80cm | |
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US $11.99 | 29d 2h 50m |
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95mm Water Cooling System Rudder for RC Boat Ship RD | |
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US $14.06 | 27d 20h 57m |
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Boat Water
How do I Check a Used outboard Boat Motor out of the water?
140 hp mercury outboard. I know that it is not good to run a boat motor without water because it might heat up.so how can i start the motor to check that it works? where do i connect a home waterhose to the motor to have the water run through it and check for proper operation?
walmart, basspro, academy sports, any marine store. The seller darn well ought to have one. looks like two extra large suction cups facing each other, a couple inches apart, connected by a plastic arm thingy.
The real reason to never start an outboard without water is because of the water pump impeller...it will be damaged by just a minute or two of dry running, way before the powerhead overheats.
So if the seller starts the motor without supplying water to the water pump, walk away.
Don't ever rev an outboard on the muffs. Without backpressure on the underwater exhaust, "thermal runaway" can result, in which bits of hot carbon in the cylinders ignite the incoming fuel/air charge. Without a load on the motor, RPMs can race way beyond it's design specifications, and there's no way to stop it. It can literally self-destruct.
Because the motor will have no load on it whatsoever, you won't be able to tell how it will perform when you get it in the water. Even a crappy-running outboard can sound great on the muffs.
All you can really do is a compression test. If the cylinder with the lowest PSI isn't within 5% of the highest, walk away.
If you live in a jurisdiction that has separate titles for outboard motors (my state does), and the seller doesn't have clear title, walk away...it's not worth the hassle.
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2200kv Leopard 4082 brushless marine motor for RC boat V2 40mm water cool jacket | |
|
US $129.99 | 28d 4h 30m |
|
aluminum water cooling jacket for B36 540 brushless motor for rc boat- silver | |
|
US $12.99 | 28d 19h 52m |
|
RC Boat (Automatic Water Absorption) Water Gear Pump DC4v - 12v + "Free" T-plug | |
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US $16.00 | 3h 33m |
|
seaking-120A Water Cool Ship Brushless Motor Hobbywin ESC For rc boat hot sale.. | |
|
US $75.90 | 29d 4h 36m |
|
SEAKING 4800KV Brushless Motor W/Water-cooling for Boat 2040SL | |
|
US $26.80 | 25d 18h 49m |
|
75mm Silver Aluminium Water Cooling Boat ship Rudder for RC Boat | |
|
US $7.19 | 22d 21h 30m |
|
Vintage Dumas Rudder and water pickup for Pay-N-Pak .21 Hydroplane Boat kit | |
0 Bid | US $39.99 | 1d 2h 39m |
|
RC Boats & Submarine ~ Water Gear Pump DCv 4v - 12v + "Free" T-plug Set | |
|
US $14.99 | 12d 3h 47m |
|
Xpower B36 540 550 Adjustable Alu. Brushless Motor Mount RC Boat Water Cooling | |
|
US $1.56 | 13d 22h 21m |
|
rc gas boat water pump | |
|
US $22.11 | 11d 20h 38m |
|
75mm RC Boat Rudder with Water Cooling - HARD ANODIZED | |
|
US $7.50 | 22d 19h 30m |
|
RADIO CONTROL MODEL BOAT Water Scoop Set | |
|
US $3.14 | 25d 3h 31m |
|
O.S. Max .21 marine boat nitro engine glow water cooled shaft or cable drive NR! | |
6 Bids | US $40.00 | 1d 18h 4m |
|
151B71 125 Amp Water Cooled Brushless ESC Radio Remote RC Boat | |
|
US $49.64 | 28d 15h 41m |
|
120A ESC water cool electric speed controller for brushless motor -rc boat | |
|
US $69.00 | 28d 17h 20m |
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Sea-king 50A Boat Speed Controller ESC reverse Ship Forward/Backward Water Cool | |
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US $22.80 | 29d 21h 11m |
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Aluminum water pickup dual New version rc boat | |
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US $6.00 | 27d 3h |
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RC Model Ship 55mm Water Stabilizer Boat Trim Fin TF515 | |
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US $10.90 | 28d 11h 52m |
|
160mm rudder dual water pickup for 67-90/ 23-35 rc boat | |
|
US $30.00 | 11d 18h 59m |
|
Spartan Boat BRUSHLESS 540XL MOTOR with water motor cooling jacket Traxxas 5707 | |
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US $119.99 | 4d 5h 43m |
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95mm red Aluminium Water Cooling Boat ship Rudder for RC Boat | |
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US $9.29 | 22d 23h 24m |
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RC-Sub & Boat(Air,Gas,Liquid,Water)Micro Pump Type-B DC5v -13v+ Free JST - Plus | |
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US $23.99 | 11d 5h 13m |
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Aluminum 550 540 Water Cooling Jacket for RC Boat Ship | |
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US $11.49 | 15d 20h 43m |
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RC Submarine & Boat - MICRO Water & Air PUMP DC 3v - 7.4v + Free "JST" plug set | |
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US $24.99 | 25d 3h 25m |
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Pro Boat .18 Water Cooled RC Gas Nitro Marine Engine | |
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US $109.99 | 1d 10h 22m |
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Water-Cool Brushless Motor 60A ESC for RC boat with 5A BEC Free Shipping | |
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US $18.41 | 24d 5h 49m |
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Seaking-35A Waterproof Brushless ESC for Boats W/water-cooling system | |
|
US $39.99 | 24d 14h 29m |
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Aluminium water outlets for RC Boat M6 thread with O-ring & screws aluminum | |
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US $2.80 | 15d 21h 11m |
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TRANSOM WATER PICKUP KIT GAS NITRO BOAT 5mm 3mm 80cm | |
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US $11.99 | 29d 2h 50m |
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95mm Water Cooling System Rudder for RC Boat Ship RD | |
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US $14.06 | 27d 20h 57m |
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BP980 VANTEX RC BOAT ELECTRIC WATER COOLING PUMP | |
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US $12.86 | 21d 17h 36m |
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75mm Aluminium Water Cooling Boat ship Rudder FOR RC Boat red | |
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US $7.19 | 22d 23h 11m |
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M4 threaded water nipples for rc boat 5pcs | |
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US $4.00 | 5d 17h 44m |
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NQD Aeroboat Water Jet White 16'' Electric Speed Boat RTR | |
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US $33.99 | 2d 3h 25m |
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2X WATER OUTLET THRU HULL RC NITRO EP BOAT MARINE 20mm | |
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US $6.99 | 22d 21h 31m |
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Aluminum water pickup flush type single rc boat | |
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US $3.50 | 24d 34m |
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seaking-180A Water Cool Ship Brushless Motor Hobbywin ESC For rc boat hot sale.. | |
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US $105.90 | 29d 4h 45m |
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95mm silver Aluminium Water Cooling Boat ship Rudder for RC Boat | |
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US $9.29 | 22d 23h 30m |
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Remote Control, Boat, Car Runs over Water, Sand, Dirt, Ground, Amphibian, NEW! | |
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US $49.99 | 11d 6h 34m |
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R/C Boat Water Cooling Kit, Gas, Nitro, Electric, RC,Remote Control, Run at Home | |
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US $3.99 | 22d 13h 4m |
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Power Boating, Trailering Your Boat, Show Me How Videos
What is the speed of the boat relative to the water?
Two boat landings are 4.6 km apart on the same bank of a stream that flows 8.7km/hr. A motorboat makes the round trip between the two landings in 2.5 hr.
What is the speed of the boat relative to the water? Answer in km/hr
If speed of the boat relative to water is V, then its speed relative to ground when it moves upstream is V-8.7 and when it moves downstream V+8.7. Time to travel upstream is 4.6/(V-8.7) and time to travel downstream is 4.6/(V+8.7). Total time is 4.6/(V-8.7) + 4.6/(V+8.7) = 2.5, or
2*4.6*V/(V^2 - 8.7^2) = 2.5, or
2.5V^2 - 9.2V + 2.5*8.7^2 = 0
Solve this quadratic equation and select solution >8.7.
