Powering Dumas Bluefish ?? - 6v lead acid or 9.6v nicad ?? ESC ??

[ogopogo]

Seeking advice .... I am building a Dumas Bluefish and have to decide on my power source. This sub has two motors (Dumas 2021) which each require from 4.8v to 7.2v. I need to purchase an ESC and therefore must determine my power source. I have 4 6v sealed lead acid batteries @ 2 lbs (one, maybe two could fit in the hull) and run the motors in parallel. I also have 5 9.6v ni-cad packs (several of which could fit in the hull and be moved around for ballast) and run the motors serially. I believe each would require a different ESC choice. I will be constructing a lexan wtc for those parts which require waterproofing if that has any bearing on the choice.
thx
john (membership pending)

[fung pang]

9.6v for the stock motors?
is

9.6v for the stock motors?
is a submarine not a speed boat.
also you may smoke then.
6 v is good.

fung pang

[ogopogo]

9.6v in series ....2 motors

9.6v in series ....2 motors

[chips]

From the Dumas web site

From the Dumas web site - BLUEFISH RTR page]When you order your Bluefish in a ready to run configuration, you will receive the following items
An Airtronics Vanguard VG-400 radio with three servos installed
A 7.2v 1500mah NiCad battery pack
A HiTec SP-520 electronic speed control installed and wired to the two 4.8v motors
[/quote]

[jaschwink]

I have a Bluefish that

I have a Bluefish that was actually built by Dumas and has the 7.2 volt pack. It had PT boat speed until I cranked down the top speed on the transmitter and the receiver. It still runs pretty fast, but certainly better. I also converted to a 3000 mah nicad pack to get more running time. I had to add foam to compensate for the additional weight of the 3000's vs. the original 1500 battery. I don't think the boat will take a lot of battery weight, as mine runs awash as it is, but it dives well. Making everything controllable is tremendously enhanced with one of SubTech's pitch controllers (I have an APC3). At St. Louis, I was able to run at periscope depth much better than ever before, without porpoising.

Jim Schwinkendorf

[ogopogo]

thanks bob, I guess I

[color=#000000]thanks bob, I guess I missed that part of their site.
jim]

[jaschwink]

John,

Sorry for the delay in

John,

Sorry for the delay in replying. My hard drive decided to crash, so my computer success has not been good this week.

I had been running with 1500 mah packs, and they were giving me about 20 minutes per pack before I had to change one out. The bigger the battery, the better. Like I said, just watch your weight. The new 3000's give over half an hour each, andf I'm happy with that, as I like to check to see if I have taken on any water where it shouln'd be..... The Hitec controller is OK as I now have things set up.

Jim

[ogopogo]

thanks Jim. I have just

thanks Jim. I have just completed building the "former" to keep a consistent oval shape for my wtc. The acrylic softens nicely at about 250 degrees f. There is a support wall which will attach to one end cap to provide strength for the weak side of the oval. This saves me from re-cutting the hull to fit a round wtc in. Now, back to the oven ...