Electric info needed

[Rolex]

I have the entire electrical system from an E-Savage to install in a boat. Dual motors for dual props. Would the motor driver in the link have enough power to drive them, at 5A? I don't know what the current draw is on the E-sav system.
I'll probably be running 14.4V in the boat.

http://www.dimensionengineering.com/Sabertooth2X5RC.htm

 

[frickenjoey]

I don't think 5A will be enough power. I know those big brushed motors do pull down a good bit of power. At least 30-40A. Could you use the ESC from the E-Savage and put it in a semisealed enclosure with some water cooling tubes?

 

[Rolex]

That's probably what I'll end up doing, Joe. I was just looking at this with the possibility of setting up thrust vector steering and eliminating the rudders.

 

[frickenjoey]

Neat idea, I had a boat that was like that once...worked rather well. You could always have two ESCs and have the mixing set-up on the controler to cut one or the other off when you turn....that is how mine was set up. Super simple design. the ESCs were in a sealed box with a bunch of fuel tubing pumping through water to keep them cool

 

[Rolex]

I might look into the idea of 2 speed controllers since I'll be using a computer radio for it. It's a project for the dead of winter that's been on hold for almost a year now.
Once I bring out all the parts again, I'll know where I left off.

 

[Racer 1966]

Great! Now you'll have boat to sit on the shelf with your Savage and Heli. :

 

[Cupooterluvr]

I'm interested in this project. Hopefully it'll go in the water instead of sit on the dock under a plexiglass box

I've seen some heatsinks that mesh with the existing fins on a surface ESC before that look similar to these http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXMWA1&P=7 . You could use those for cooling. (those aren't what I'm thinking of but are close)

Ah! I found it. http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXGBH5&P=0

 

[Rolex]

Thanks for those links. I'll see what will work out once I start to get set up.

 

[frickenjoey]

Yeah Ralph I think the computer radio and two ESCs is going to be your best bet. Mine worked pretty good. I was not the one that set it up; it was the old RC Sage at my LHS back in the states. It was an aircraft control so the throttle stick forward stick would run both motors and when I would move the allieron stick it would cut one motor or the other off. I think I was running 10.5 turn brushed motors in it with 8.4 Nimh packs. It scooted along pretty good. Not as fast as my nitro swamper but still pretty quick for what it was.

 

[Rolex]

I plan to use my 7 channel heli radio with it, since it's 2.4, and there's no regulation for running ground only frequencies. That also allows me to remotely turn on lights or adjust the trim tabs.

 

[olds97_lss]

That also allows me to remotely turn on lights or adjust the trim tabs.

Geez... this thing is never leaving the shelf either!

Got any photo's of it as it is? Or are you just piecing it together now?

 

[Rolex]

I've finished all the graphics on the hull, and the entire interior has been stripped out for all the 'serious' running gear. It's just over 42" long without the hardware on the stern.

 

[olds97_lss]

I think I saw that on here somewhere before. That's a big boat!

Who was that guy working on a wood boat for a really long time... wonder if he ever finished his?

 

[Rolex]

Hehehe......
I kept a copy of the picture just in case he removed his. He took a lot of abuse over it, but I don't remember who...Cough, cough...FastEddy..Cough...it was.

That's odd, now I can't find it.
Anyway, here's my other boat, totally scratch built without blueprints. Just designed it as it progressed. 46" long, ribbed and planked. Over 500 hours, back in the 80s. Overdue for a new paint job.