ELECTRIC BOAT QUESTIONS

[NAMBA860]

I'M ABOUT TO RECIEVE MY FIRST FAST ELECTRIC BOAT IT IS AN AEROMARINE 36 INCH CAT WITH A BRUSHLESS MOTOR AND SPEED CONTROLLER THAT SAYS JETI MODEL HACKER BRUSHLESS IT ALSO SAYS 8-30 NC MASTER 77-3P OPTO AND HAS A ACCU ONIT ALSO. I WOULD LIKE TO KNOW WHAT ALL THIS MEANS. WHAT IS TO EXPECT FROM THIS BOAT? WHAT SHOULD I RUN FOR BATTERYS IN IT HOW MANY CELLS WILL THIS SPEEDCONTROLLER HANDLE AND SO ON. ANY INFO WOULD BE GREATLY APPRECIATED CAUSE I HAVE NO IDEA ON ELECTRICS.

 

[TRUCKPULL]

It would most important to know what motor you are running, and is this a race setup or a sport setup?

Larry

 

[Steve Vasdekis]

The 8-30 NC means that you can run 8-30 nicads or nimh cells that are 1.2v each. The 77 means that the controller can handle up to 77 amps continuosly with water cooling the 3P means is that this controller only works with 3 phase motors like any motor with 3 main wires coming out of it. OPTO means that you have to provide your own reciever power through 4 AA batteries or any 6.0v equivalent, this is done to reduce "noise" into the controller. ACCU is German for this is the side you plug your main battery pack into.

 

[NAMBA860]

is this good stuff i race nitro boats but will only play with this one what class would it race in and just like anyone else i may just play with it but i want to go as fast as possible.

 

[TRUCKPULL]

What Motor are you going to use??

You can not use a motor designed for 6 cell on a 24 cell boat.

Larry

 

[NAMBA860]

THE GUY TOLD ME IT IT A BIG BRUSHLESS MOTOR COST AROUND $150.00 OR SO

 

[TRUCKPULL]

I have 6 cell brushless motors that cost $190.00

Larry

A good 24 cell brushless will cost about $300.00

Larry

 

[NAMBA860]

I WILL POST YOU AGAIN WHEN I GET THE BOAT WILL IT SAY WHAT MOTOR IT IS ON IT.

 

[Pagemaster]

4-EST PERFORMANCE it sounds like you are buying a ready made boat?

If so the person selling you this should have all this info.

 

[NAMBA860]

OK HAVE SOME MORE INFO MOTOR IS A NEMESIS 9XL BRUSHLESS. THE CHARGER IS AN ASTROFLIGHT. IT COMES WITH A 12 CELL BATTERY PACK. HE ALSO SAYS IT HAS A TRANSMISSION I HAVE NEVER HEARD OF THAT COULD IT BE. HE ALSO SAID 18 CELLS IT COULD RUN 65 MPH AND WITH 24 CELLS IT REACH 71 MPH. IS THIS REALISTIC AND HOW FAST WOULD IT GO WITH THE 12 CELL PACK HE IS GIVVING ME? PLEASE HELP!!!

 

[Pagemaster]

I would love to see that boat with that motor run 65!

 

[LOU]

I'd think with 12 cells you may hit 40mph but your run time will be around 1.5 to 2 min, this is assuming you have good cells(min Gp3300's) You could probably set it up to run low to mid 30's for 4 mins. The transmision is more likley a gearbox. 18 cells could get you mid 40's but you'd be pushing the cells and controller. 24 cells could be run with some huge gear reduction and maybe get you into low to mid 50's but not for any length of time. Sounds like a decent hull, but maybe a bit big for 12 cells. One thing to watch for on the nemisis motors is a lose rear bearing plate. They are just glued in. If it pops out you could take the esc out also. Running on the gearbox doesn't put load agaist the plate so it will probably be OK.

 

[NAMBA860]

WELL LIKE I SAID I KNOW NOTHING ABOUT FAST ELECTRICS THIS MY FIRST ONE. SO I'M JUST ASKING. ANY SUGGESTIONS WOULD BE HELPFULL MINUS THE CRITISISUM.

 

[David Newland]

I run the 9XL on a gearbox (transmission) quite a bit, and can help you with some basic set up tips.

On 12 cells, you can direct-drive that motor with an X445 prop. Direct drive = set up your pinion and spur gears to be the same size. For more info, visit www.finedesignrc.com regarding different gear sizes/ratios.

Typically, you would use a 60 pinion gear (on motor) and a 60 spur gear (drive shaft on gear drive). You may need a different hub from fine design for this.

With good 3300's or better, you are probably looking at about 33 mph for 3+ minutes.

On 18 cells, you can gear this motor 1.5/1 on the gear box. Meaning, pinion gear 45 tooth, spur gear around 68 tooth. This will be in the high 30's with 3+ min runtime. Also an X445 prop.

The 9XL will max out at about 20 cells and can be geared around 1.7/1 (45 tooth pinion, 78 spur). I have not, nor will I run the 9XL on more than 20 cells. Also an X445 prop.

The gearbox gives you plenty of gearing options. If you want it to go faster, gear it more agressively. But, you will lose run time as a faster set up means it's using more amps from your batteries.

 

[NAMBA860]

NOW THATS WHAT I'M TALKING ABOUT THANK YOU VERY MUCH. I THINK WHAT I WANT TO DO WITH THE BOAT IS MAKE IT GO AS FAST AS POSSIBLE WITH THE ENGINE AND SPEED CONTROLLER I HAVE. I JUST WANT TO DO SOME STRAIGHT LINE RUNS WITH THIS BOAT AND USE A RADAR GUN. SO I WOULD NEED TO KNOW WHAT BATTERY PACK I WOULD NEED WHAT PROP AND WHAT GEARS TO RUN TO GET ALL OUT SPEED FROM THIS BOAT. AND HOW FAST DO YOU THINK IT WOULD RUN AND HOW LONG?

 

[David Newland]

I have given you setups that will pull 45-50 amps. Knowing that you have a 77 amp speed controller, you don't have much room to be more agressive. Some room, yes, but not alot. You should ultimately keep your amp loads no higher than 60 IMO with your equipment.

I know you've got a ton of boating experience, but this being your 1st electric, get your feet wet with some of the setups I mentioned above. Let us know how it goes. Run time, battery/ESC/motor temperatures after the run, how the boat handled, etc.

A few more things to consider: Is your motor/ESC water cooled? They should be.

Use good cells (new 3300's, 3600's, 3800's), good connectors (visit offshoreelectrics.com), and don't drive the boat until the batteries die. When you see the boat start to lose speed, bring it in immediately. Most of the heat/damage occurs when you continue to run the boat after the batteries have dumped.

 

[NAMBA860]

I have given you setups that will pull 45-50 amps. Knowing that you have a 77 amp speed controller, you don't have much room to be more agressive. Some room, yes, but not alot. You should ultimately keep your amp loads no higher than 60 IMO with your equipment.

I know you've got a ton of boating experience, but this being your 1st electric, get your feet wet with some of the setups I mentioned above. Let us know how it goes. Run time, battery/ESC/motor temperatures after the run, how the boat handled, etc.

A few more things to consider: Is your motor/ESC water cooled? They should be.

Use good cells (new 3300's, 3600's, 3800's), good connectors (visit offshoreelectrics.com), and don't drive the boat until the batteries die. When you see the boat start to lose speed, bring it in immediately. Most of the heat/damage occurs when you continue to run the boat after the batteries have dumped.

ESC IS WATER COOLED THANKS FOR THE INFO.

 

[NAMBA860]

HAVE SOME MORE INFO SINCE I GOT THE BOAT. IT HAS TWO 6 PACK BATTERYS WITH DEANS CONNECTORS 3700 SIZE. GEAR METAL GEAR ON ENGINE IS A 41 AND PLASTIC GEAR ON THE TRANS IS A 62 HAS AN OCTURA X445 PROP AND THE BOAT IS AN AERO MARINE MEAN MACHINE CAT THAT IS 29 INCHES LONG.

 

[Pete B.]

OK just to continue what David has said,

The mean machine can race in the P off shore class and the Q off shore class, it's more suited to the Q O/S class due to it's size (P= 12 cells, Q= 18 cells). The Mean Machine is a big boat for 12 cells but you can do it. On 12 cells direct drive it like David said with the 445. To direct drive it with what you have you need 1 more 62t gear and a 5mm hub adapter. Chris Fine has them. On the first run check the motor and cell temp after the first min.

That boat is at home on 18 cells and can fly across the water. The gear ratio you have is 1.5:1 putting 1263 rpm/v at the prop (if it is a nemisis motor) with the x445 prop you have that boat will haul the mail! Just use 18 cells. You have 12 3700's you just need 1 more 6 cell pack! Again check temps. I ran a 14xl direct drive in that hull with a prather 220 prop( similar to a 645) in Q O/S and the boat was a rocket.

 

[NAMBA860]

ok great another question i have is i want to make sure the wires are hooked up to the and speed controller correctly. the motor has 3 wires coming from it red,green,and yellow. they are hooked up to the speed controller the red motor wire is going to black on the esc the green on the motor is going to white on the esc and the yellow is going to the red on the esc. is this correct?on the other side of the esc is a negative at the top and positive on the bottom they are marked on the esc.there is a red wire coming from the positive going to a deans connector and a blck wire comming from that same deans connector going over to another deans connector on the other side of that deans connector is a black wire going to the negative side of the esc is this correct? do i just plug the two battery packs into these two deans connectors?what if i want to run 18 cells how do i hook the third battery pack up? also what is the diffrence between nc and lipo batterys?should i run the 1to1 or the 1.5 to 1 gear ratio i want this boat to go as fast as it can i dont care how long it runs for.