E-LST2 Project

[riceman]

Hi all – I haven’t posted much but have been lurking here since my first purchase from Mike back in July of this year. Since then I’ve put together a couple of trucks – G2R and an MGT. but nothing I thought really worth posting since most of what I did wasn’t too radical and has been done and posted here already. I guess that can be said of my latest project too but here it is anyway. It’s still a work in progress but it’s finally up and running. There are a few things left to work out (battery trays, location of mounting esc, clean up wiring) but I thought I would post what I have done to get to this point. Here is a short list of what has gone into it so far starting with a completely stock LST2 roller. I pulled out the OS30 which is now sitting in a parts bin (anyone need a nearly new OS 30?) and fabricated a motor mount using 2” 1/8” thick aluminum angle. The mount will eventually be beefed up to 1/4 “ thick angle to deal with any flexing issues but for now it’s doing the job for the initial test runs. Thanks to all who have braved the risks of testing the Mamba Max and posting their results or otherwise I may not have attempted this project.

Motor = Neu 1515 1Y 2200kv
ESC = Mamba Max with external UBEC
Batteries = Maxamps 4S 8000 mah (2 2s2p packs in series) and I have also run 5S 4000 mah (3s and 2 s in series)
Single speed conversion running stock 63t spur and 25t brass pinion

So far so good. Even with the wheelie bar attached this thing will flip on it’s lid even while rolling at about 10mph (5S lipos). There is so much torque even with the 2nd gear only single speed. I have not stressed it out yet due to the fact that I haven’t figured out a way to secure the battery packs yet – so no major jumps just yet. Right now I fabricated a temporary tray out of polycarbonate and taped the batteries down. I’ll have to go to something a little less brittle. The electronics seem to be happy. After several speed runs nothing is over 110 degrees. Looks like there is room to go up on gearing. According to Brian G.'s speed calculator (thanks Brian) it's currently geared at around 32mph. The MM is set up for forward only. Motor braking is turned off. Braking is handled mechanically via third channel mixing.



The roller


Single speed conversion using Robinson Racing slipper parts


Bolt pattern of the stock spur and RRP slipped is a match


Mamba Max with UBEC wired


3" servo extension with red wire clipped to bypass MM internal BEC




Roll bar is getting a workout during initial testing!


Here is a short video of the truck bashing about. Please cut my cameraman some slack. It was either give my 7 year old son the video camera or the controls to the e-lst. Apologies for the music drowning out the sweet whine of the Neu, but I felt I need to spare everyone my son’s and his 5 year old sister’s commentary.
http://www.youtube.com/watch?v=rpkbuyXOg6Q

As I mentioned earlier, this is very much a work in progress. I welcome everyone’s comments and suggestions. Thanks everyone for a great forum.