Edit: Here is the DH Comp as it currently stands:
The Original post was stupid so I edited the stupid parts out
Form the original post:
Here is the basis for my build:
2002 Giant DH Comp (135mm drop-outs) Marzocchi Drop-off triple forks and pro-wheel 19 x 2.15 rear and 1.65 front blue rims.
I picked up a pair of Drop-off triple forks that supposedly needed work. I tore both of them down thinking that I might be able to make one good one, but I couldn't find a thing wrong with either one. Neither is leaking oil and both hold air and the internals look like new. So now I have 2; one for a QR axle and the other for a 20mm axle. The 20mm one is going on this bike.
I will be using IRC GP1 2.75 x 19 trials tires:
I will be using a MAC 6T rear motor. Right now I have on the back of my HardRock (which is also sporting the other Marz Drop-off). I slapped this together just to get a feel for the motor that I got in trade with a member here for a brushed mid-drive kit that I wasn't too fond of. At the moment I only had a spare 36v 250w controller and I must admit that I like it. It pulls hard even with the fast wind and only 250w. It will go almost 25 mph on 36 volts so I think it will be fine with around 1000w and 72 volts. (if this out of line for this motor, please tell me now before I progress too far.
So, This brings me to the first known unknown (to quote Rumsfeld) - The Battery.
I would appreciate some input from those who are more knowledgeable than me.
First off. I just finished remodeling my house and I bought it less than a year ago. Therefore, Lipo is out of the question. I will not risk burning it down. 18650s seem like the way to go and after reading SpinningMagnets' article on high drain 18650s, I believe that I will be happy with the results. For my specialized build, I used Samsung 29E batteries and build two 4 10s 3p packs and two 10s 2p packs that I am running parallel at 36v 29ah. This is fine at 250w and maybe even 500 but I am unsure whether these batteries will be OK for 1000w.
Here is a tracing of the triangle area with two configurations for the battery cells:
I used pennies to lay out the cell locations since they are 19mm in diameter so I will get a good idea of how many I can fit in.
I intend to run this motor at 72 volts and either 750 or 1000 watts. Therefore, I am looking at using 140 cells 20s 7p.
I found a new battery that came out of Japan specifically for the e-cig crowd. It is a 3.7v 2500 mah 35a drain 18650 at around $4.50 (probably $5.00 after shipping). I think it is comparable to the Samsung INR 25r but is at least a dollar cheaper.
What do you think regarding my battery ponderings?
The goal for the bike is to be able to cruise at around 30 mph. It will be mostly street riding but pot holes get to be pretty messy here in the Northeast.
That's it so far. In this thread, I will also update my progress on the HardRock as now that I have it functional, I intend to make it pretty.