Shockwave36 Conversion build

[RMZDADDY]

Watts/volts=amps, or volts x amps = watts. If you take the max cont. amp rating of a 10xl (66 amps) times the voltage of 18 cells you would get 1425.6 watts. The max cont rating of a 14xl is 47 amps, that times the voltage of 24 cells you get 1353.6 watts. You're producing almost the same amount of wattage with a 14xl at 47 amps on 24 cells as you are with a 10xl at 66 amps with 18 cells. You would be producing about 2000 more rpm at that voltage with the 10xl, but with less torque.

[Steven Vaccaro]

volts x amps = watts/horsepower.

So there are two ways to get to the same horsepower.

Say 18v x 60a= 1080
or
24v x 45a = 1080

I learned a long time ago that a electrical system like we use runs far better on the second setup. Andy Kunz explained that to me and its something I live by. Think of it this way "AMPS KILL PARTS".

[saleens7]

the esc im using can handle up to 100amps and bursts of 120amps.....

so with the 18 cells and a 10XL i would be spinning a smaller prop? so a 14XL on 24 cells would spin a larger prop....what if i used a 12XL on 18 cells i would be getting around 30,000 free rpms.(i would think that if i use the same amount of cells but the higher the turns of the motor, the less rpm it will make, but the more horsepower, is this correct?)..whats the amp rating of the 12XL? how many amps will that setup produce?

[Steven Vaccaro]

There is more to take into account. As rpm or number of turns decreases, so does the torque of the motor. So a 14xl has more torque than a 12xl.

You want to stay in the 25k rpm range on a boat that size.

[saleens7]

so a 13XL would be what im looking for?

Ill get about 27,000 free rpms, but when under load, im guessing it will get about 25K or 26K...is that about right?

whats the amp rating of a 13XL?

i dont want to use the 14XL, thats just too little rpms, although i would probably get good speed with this setup if i used a big prop, if the props too big, it will actually hit the rudder when turned full left...

i dont want to go back to 24 cells because it will be easier for me to afford this setup and it will be lighter...

[part time]

have u thought about using a mega 22/45/2 it has a kv of 1380 and 45amps max and has 6 poles. or the ammo 36-88 it has a kv of 1280.

[saleens7]

no...but i think im going to stay with a feigao..

[steveo]

if you want to use 18 cells and a 10 xl then get a fdm gear drive, and dont be concerned about a little more weight to run 24 cells,your going to need some grunt to get that boat going and try not to burn anything up at the same time, 24 cells and a 14 xl should be good for 35mph

[saleens7]

you sure...ok....i cant use a gear drive, i already have the motor mount JB-welded in...35mph sounds right, thats what the boat was supposed to run with the nitro in it...

EDIT: and welcome the OSE forum steveo...

[saleens7]

hmmm...whats left to buy for this build

fiegao 14XL: 70$

112D charger: 126$

power supply: 67$

batts: $167.63

Y harness: 20$

connectors (question, what size should i use for 12 gauge wire and whatever size wire on a feigao?): ??? (depends, but im guessing around 10$ or so)

Radio system: 165$

servo: 26$

other stuff i dont know i will need until i need em: priceless (ok...id guess around 20-30$ being realisticly)

grand total: 671.63$

i have thats much left to spend on this build and it has been going on since i think march or something like that...

and this is my cheaper build...i just cant wait to get started on that 1,000$+ drifter build...:D (sarcastic)


i have enough $$$ to buy the charger and power source right now, its that i dont have the cash in my possesion, my parents just say that thats how much i have, but if they done feel like buying something or if we arent in a good financial cituation, i cant buy anything...the reason i havent done much on this is that most everything i can buy for it is over 100$ and because we just about recovered from the taxes, i havent been able to buy anything between the time of the taxes till now.....

i just cant wait to get it running

question, my esc has 12 gauge wires (i think) im guessing the feigao does also (if not, what gauge are they?) what mm connectors will fit this wire?

[steveo]

get the 5mm connectors, i think the motors wire are #10 it seemed thick to me

[saleens7]

did a little modding to the hull....found an old ryobi dremel bueried deep in the garage and i used it to trim away some of the stringers that might have blocked the batteries from being mounted....not too much of a difference, but should help out...ive been wanting to buy something for this build for a while, but my parents keep on saying "next weekend" weekend after weekend....i think my birthday present will have to be the batts and radio system or something like that....it strange, my parents have enough cash to go out and buy some really expensive camera that i know costs hundreds of dollars more than all the money i will spend on this build, but they cant even buy a charger or battery source even though the money they would spend for it would be coming out of my account...

[SJFE]

Saleens my man...You need to get your self some side work. When I first go married(the first time) I was heavy into nitro buggies and 1/10 stadium trucks. We made crap for money. So I bought a used mower & line trimmer and put an add in the paper. 2 months later I had a Mugen Athlete and an RC10 GT:D. The wife couldent say a word....I did it by myself for myself. 30 bucks a lawn man...it adds up fast.

[saleens7]

ive been thinking of a car washing service, but weve had water restrictions lately, so thats not going to happen for now....

i found out my esc has 14 gauge wire going to the motor....what gauge does the feigao have? what size connectors should i use? stevo says he thinks their 10 gauge...but does anyone surely know what guage wire the feigao has?

[saleens7]

also, what is used to shrink Shrink tubing?