Scratch Built Shrimp Boat.
08-17-2011, 09:31 AM
#29
My Feedback: (5)
RE: Scratch Built Shrimp Boat.
Check your dimensions and go to http://shop.ebay.com/i.html?_from=R4...d+Acid+Battery and see what fits. That way you can get the right size for AH rating.
08-17-2011, 10:26 AM
#31
My Feedback: (5)
RE: Scratch Built Shrimp Boat.
You can probably use a 5AH battery. There's a couple of them ending in less than 15 minutes as of this writing with free shipping. 5000mAh should last about 2 hours or more depending on throttle and accessories (lights, hoists, etc) If you're planning on a lot of accessories you could use 2 paralleled.
Watch out for date coding!
Watch out for date coding!
08-17-2011, 10:37 AM
#34
RE: Scratch Built Shrimp Boat.
ORIGINAL: rblubaugh
You can probably use a 5AH battery. There's a couple of them ending in less than 15 minutes as of this writing with free shipping. 5000mAh should last about 2 hours or more depending on throttle and accessories (lights, hoists, etc) If you're planning on a lot of accessories you could use 2 paralleled.
Watch out for date coding!
You can probably use a 5AH battery. There's a couple of them ending in less than 15 minutes as of this writing with free shipping. 5000mAh should last about 2 hours or more depending on throttle and accessories (lights, hoists, etc) If you're planning on a lot of accessories you could use 2 paralleled.
Watch out for date coding!
08-17-2011, 10:59 AM
#39
My Feedback: (5)
RE: Scratch Built Shrimp Boat.
Sure, more AH more run time and more "stuff" you can do. Your limitations are how much room you have available, in which case you may have to raise the rear deck.
Speaking of the rear deck, looking at the Shrimp boats you have I could see nothing definitive about the deck but if I were to "guess" I'd say the deck was level bow to stern. Just a guess on my part. I've been with in a few hundred yards of Shrimp boats but not close enough to see their decks.
Speaking of the rear deck, looking at the Shrimp boats you have I could see nothing definitive about the deck but if I were to "guess" I'd say the deck was level bow to stern. Just a guess on my part. I've been with in a few hundred yards of Shrimp boats but not close enough to see their decks.
08-17-2011, 11:10 AM
#40
My Feedback: (5)
RE: Scratch Built Shrimp Boat.
What is your motor nominal voltage rating? If it is 12v then 12v is better; you can always use droppping resisters for the lights. Here it depends on your motor.
Again how much room do you have available? Decisions, decisions.
Let me back step about the deck a little. I found a couple of pictures which may be helpful. One is as I said the other has a raised fordeck. Hope you get some ideas from them. The secon picture is a scale model of a real shrimper.
Again how much room do you have available? Decisions, decisions.
Let me back step about the deck a little. I found a couple of pictures which may be helpful. One is as I said the other has a raised fordeck. Hope you get some ideas from them. The secon picture is a scale model of a real shrimper.
08-17-2011, 11:13 AM
#41
RE: Scratch Built Shrimp Boat.
Here is the info on the motor from Harbor Models,
800 Direct Drive Motor
Top RPM: 5167
Runs on 12 Volts
3 Pole
Maximum amperage draw: 5.28amps
Will efectively propel a 36" deep vee boat with a 2" prop Can also turn props up to 3.5 " @ 2500 RPM
Motor mount included.
Overall Length: 4 1/4"
Can Length: 3"
Can Diameter: 2"
Drive Shaft Diameter: 1/4"
Drive Shaft Length: 1/2"
800 Direct Drive Motor
Top RPM: 5167
Runs on 12 Volts
3 Pole
Maximum amperage draw: 5.28amps
Will efectively propel a 36" deep vee boat with a 2" prop Can also turn props up to 3.5 " @ 2500 RPM
Motor mount included.
Overall Length: 4 1/4"
Can Length: 3"
Can Diameter: 2"
Drive Shaft Diameter: 1/4"
Drive Shaft Length: 1/2"
08-17-2011, 12:11 PM
#42
My Feedback: (5)
RE: Scratch Built Shrimp Boat.
O.K., you have a 12V motor. The 5.28A is the Max amp draw before the motor will "melt down". Momentary is o.k. but a continuous stall at or above that current will burn up the motor. That is the reason for fusing as in the diagrams I sent in your last build. That does not have anything to do with the AH rating of the battery only the max Amps the motor can draw before being permanently damaged. If you have a 10Ah battery it will last 10 hours if the current draw is 1 amp per hour, 5 hours at 2 amps per hour, etc.
Your motor spec don't indicate what the "nominal" current draw is, that is the amount of current it would draw under "normal" conditions. Again, there's a lot of variables; model size, weight, prop size (diameter & pitch). All will have a bearing on the amount of current drawn. Often you can "google" the motor model asking for "specs" and get more information.
Your motor spec don't indicate what the "nominal" current draw is, that is the amount of current it would draw under "normal" conditions. Again, there's a lot of variables; model size, weight, prop size (diameter & pitch). All will have a bearing on the amount of current drawn. Often you can "google" the motor model asking for "specs" and get more information.
08-17-2011, 04:37 PM
#43
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RE: Scratch Built Shrimp Boat.
SLA batteries. I have bought AGM SLA's from http://www.powerstarsla.com/ several times for My computer equipment, UPS. I have five UPS units at present. The Power Star batteries perform well for me. Even the ones out in the garage. All of mine so far, have come well packed, and free of shipping damage.
For those who may be curious SLA = Sealed Lead Acid and AGM = Absorbed Glass Mat.
As far as you choice of motor goes the MFA Como 800 should be a good all day runner for you. According to the spec sheet from the MFA web site its a 12V motor. It'll run all day flat out on 6V no problem as long as your prop isn't too big of a load for the motor. On 12V MFA claims a current draw of 5.28 amps "AT MAXIMUM EFFICIENCY". So if the air in the vicinity of the motor is at or near ambient you should be able to operate at that current level or less all day. You need to have good air flow near the motor. Water cooling would let you push it harder.
Your motor current will be determined by how big a load on the motor your propeller is. You can do a bathtub test. With the model in the tub floating at the waterline, run the motor up to full speed and measure the current in one of the motor wires. You only need to do this long enough to get a good current reading. If its 5.28 or less your good, if it's more then you need less propeller.
MFA says the stall current for this motor is 28.2 amps. Saw it on their site. So your Electronic Speed Control needs to be able to handle that for a couple seconds when you do a full power start or are trying to get out of the weeds.
It looks like you're going to have a lot of fun!
For those who may be curious SLA = Sealed Lead Acid and AGM = Absorbed Glass Mat.
As far as you choice of motor goes the MFA Como 800 should be a good all day runner for you. According to the spec sheet from the MFA web site its a 12V motor. It'll run all day flat out on 6V no problem as long as your prop isn't too big of a load for the motor. On 12V MFA claims a current draw of 5.28 amps "AT MAXIMUM EFFICIENCY". So if the air in the vicinity of the motor is at or near ambient you should be able to operate at that current level or less all day. You need to have good air flow near the motor. Water cooling would let you push it harder.
Your motor current will be determined by how big a load on the motor your propeller is. You can do a bathtub test. With the model in the tub floating at the waterline, run the motor up to full speed and measure the current in one of the motor wires. You only need to do this long enough to get a good current reading. If its 5.28 or less your good, if it's more then you need less propeller.
MFA says the stall current for this motor is 28.2 amps. Saw it on their site. So your Electronic Speed Control needs to be able to handle that for a couple seconds when you do a full power start or are trying to get out of the weeds.
It looks like you're going to have a lot of fun!
08-18-2011, 02:46 AM
#45
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RE: Scratch Built Shrimp Boat.
ORIGINAL: rblubaugh
What is your motor nominal voltage rating? If it is 12v then 12v is better; you can always use droppping resisters for the lights. Here it depends on your motor.
Again how much room do you have available? Decisions, decisions.
Let me back step about the deck a little. I found a couple of pictures which may be helpful. One is as I said the other has a raised fordeck. Hope you get some ideas from them. The secon picture is a scale model of a real shrimper.
What is your motor nominal voltage rating? If it is 12v then 12v is better; you can always use droppping resisters for the lights. Here it depends on your motor.
Again how much room do you have available? Decisions, decisions.
Let me back step about the deck a little. I found a couple of pictures which may be helpful. One is as I said the other has a raised fordeck. Hope you get some ideas from them. The secon picture is a scale model of a real shrimper.
