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Scratch Built Shrimp Boat.

Old 08-17-2011, 07:50 AM
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Default RE: Scratch Built Shrimp Boat.

Is this boat a "fishing for fun" boat or a working boat?

Sorry no answer on the batteries from me.
Old 08-17-2011, 08:12 AM
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Default RE: Scratch Built Shrimp Boat.


ORIGINAL: QuickLTD

Is this boat a ''fishing for fun'' boat or a working boat?

Sorry no answer on the batteries from me.
Working boat.
Old 08-17-2011, 09:11 AM
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Default RE: Scratch Built Shrimp Boat.

I was just looking at 6V batteries and it looks like they come in many shapes and sizes. I have to pick one and build the engine box/battery box to fit the battery.[:'(]
Old 08-17-2011, 09:31 AM
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Default 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.
Old 08-17-2011, 09:55 AM
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Default RE: Scratch Built Shrimp Boat.

What AH rating should I be looking for?
Old 08-17-2011, 10:26 AM
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Default 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!
Old 08-17-2011, 10:30 AM
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Default RE: Scratch Built Shrimp Boat.

I know you know this but you can always "ask" for cheaper shipping. Was looking at one whare the shipping was more than the battery.
Old 08-17-2011, 10:34 AM
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Default RE: Scratch Built Shrimp Boat.

I saw two 4.5 AH for $10.90 free standard shipping, 2.75 x 4 x 2
Old 08-17-2011, 10:37 AM
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Default 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!
Ok, if 5Ah is good, would 7AH be better or even 10AH. As it sits and in order to keep the weight of the battey at or near the CG, I'll only be able to run one battery.
Old 08-17-2011, 10:41 AM
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Default RE: Scratch Built Shrimp Boat.


ORIGINAL: wayne d

Any of you guys know the measurements of a sealed 6V battery?
Found a 12v on Tower Hobico L 5.9 W 3.5 H 3.6 5.25 lb
Old 08-17-2011, 10:46 AM
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Default RE: Scratch Built Shrimp Boat.

How about this one.
6x4x1 4lbs
http://www.exitlightco.com/product/B6V7A.html
Old 08-17-2011, 10:50 AM
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Default RE: Scratch Built Shrimp Boat.

Here is a pretty good site.

http://www.zbattery.com/Batteries/6V
Old 08-17-2011, 10:59 AM
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Default RE: Scratch Built Shrimp Boat.


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ORIGINAL: wayne d

Any of you guys know the measurements of a sealed 6V battery?
Found a 12v on Tower Hobico L 5.9 W 3.5 H 3.6 5.25 lb
Would 12v be better?
Old 08-17-2011, 10:59 AM
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Default 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.
Old 08-17-2011, 11:10 AM
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Default 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.

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Old 08-17-2011, 11:13 AM
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Default 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"
Old 08-17-2011, 12:11 PM
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Default 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.
Old 08-17-2011, 04:37 PM
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Default 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!
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Old 08-17-2011, 07:02 PM
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Default RE: Scratch Built Shrimp Boat.

Thanks for the info John.
Old 08-18-2011, 02:46 AM
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Default 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.

You shure do come up with some nice pics. Pic no 2 looks like a drager,looks like doors aganst the sides,and a net reel on the after deck. Looks like a steel hull,like the Andria gail (perfect storm) ,whitch was a converted shrimper built in Panama city FL. Soo hull no 2 could be a drager or shrimper
Old 08-18-2011, 02:53 AM
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Default RE: Scratch Built Shrimp Boat.

Wayne, I'm sending somthing to you,iff you want more I can get them down town. Larry
Old 08-18-2011, 03:15 AM
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Default RE: Scratch Built Shrimp Boat.

John,

Thanks for all that great information, clearing up my inconsistencies.

Bob<br type="_moz"/>
Old 08-18-2011, 03:22 AM
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Default RE: Scratch Built Shrimp Boat.

I second what Bob said again!
Old 08-18-2011, 03:24 AM
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Default RE: Scratch Built Shrimp Boat.


ORIGINAL: blizard05

Wayne, I'm sending somthing to you,iff you want more I can get them down town. Larry
Hey Larry
I'll be checking the mailbox every day but Sunday.
Old 08-18-2011, 11:00 AM
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Default RE: Scratch Built Shrimp Boat.

Here is a Very Very basic start to the cabin. And when I say basic, It's basic.
The boat laying on it's side is somewhat what I'm shooting for.
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