Tucson Death Race 2011 roll call. Results on page 1

[katou]

April huh? Alright, I see what I can get together as far as a sponsored battery pack.

The pack would be A123's probably soldered together with nice thick 10 awg solid wire.

Should I see about 24v 10 ah subpacks that could be ganged together? What would be a good pack size here?

Don't count on me until I say you can, but I will make some effort to get something together.

But please, tell me what you want!

Katou

ps. Thud, where exactly in Michigan would you be starting from?

[John in CR]

....sponsored battery pack....But please, tell me what you want!....

Katou

The sponsor to provide battery packs to use for the racing for anyone willing to sport the sponsors logo. A few cycles is nothing in terms of the pack lives, and I'm sure some of us will want to purchase the packs as well.

John

[liveforphysics]

The pack would be A123's probably soldered together with nice thick 10 awg solid wire.

I think he is looking for a performance battery solution.

AKA, Nano-Tech's or other high-C rate LiPo.

[wineboyrider]

If you can get away for two nights, we can do something where you come with me Wineboy. Get you here the night before, drive there race day, then likely spend one night in a cheap motel in Benson.

Wineboyrider has a very flexible schedule. I am not in it to win anything just for fun!

let me know when the dates are for sure and I'm 90% sure I'll go....yippeee.

[amberwolf]

You guys within driving distance should ride your bikes there.

If I had a lightweight generator to run the bike on the way down, and a few days off work before and after (in case stuff went wrong so I could fix it and still get back to work on time), as well as someone I could trust with the dogs, I'd actually like to do that.

But lacking the above, I can still do an overnight stay if I have to (and can get the right day off work) but I would need to get back as quick as possible, cuz there'll be some hungry dogs awaitin'. Still don't think I could ride down there, though; it'd be at least 12 hours one way, assuming no problems and no stops for anything, being limited to 20MPH in this state.

[dogman]

Added to the list of guys intending to show up SoSauty and Wineboyrider. I thought I'd seen a build thread that looked racy, and the way you kept grinning I knew you had fun SoSauty. But stuff happens, plans change. Also would expect Evoforce to come, but haven't had him chime in yet.

Looks like not only a great E-bike turnout this year, but enough for a real race among us. At this point the plan is to race in the regular death race, and do our own scoring for finishing places in the electric class. So we are racing the gassers, and each other in the same final heat. Whoever does the scoring for the E race will have to do it from a distance, since only track personell are allowed on the track. Insurance. By the last lap, somebody is likely to be clearly in 1st place. If you win the Death Race, then you'd get two trophies of course.

[katou]

I know that the Nano Lipo would be best, but I can't get that stuff cheap enough to sponsor a racer!

Oh well. Anyway, it's not at all certain that I will be even able to do that. I'm just throwing it out there so that you can tell me what size to make the packs IF I can get enough.

IF...

Katou

[dogman]

Extra battery just for guys to use in the preliminary heats and practice laps would be a big help.

I'm squared away with enough lipo for two heats, but riding practice laps means farting around with charging instead of yakking with the guys.

I think a lot of us will have bikes running something in the 72v range, so one 72v 10 ah would definitely be a good starting point. That would get you through the main death race, on a bike using 2500 watts or so. If not with bms, then at least some kind of low voltage warning would be good, even if it was just a few extra andersons a voltmeter could be plugged into. My setup will be above CA voltage, so that's going to be my plan, mount a voltmeter on the dash instead of a CA.

A nice 72v A123 battery would sure make a good prize to race for!

Looks like the date is April 16th. Saturday.

[AussieJester]

A nice 72v A123 battery would sure make a good prize to race for!

No use for those running rc ESCs on their rc motored setups Dogman limited
to 50v max.

KiM

[spinningmagnets]

Is there a possibility that the majority of E-bike racers from ES could settle on a standard battery choice? I don't want to try to limit anyone from their preferred choice, but...

If a particular racer had a bike breakdown halfway through the various heats, having the same size and type of battery means the breakdown bike could loan their batteries to those still in competition, with the certainty that the size will fit in the battery box, and the performance will be the same as the batteries used to develop the loanee bike?

I was thinking that with several LiPo bricks in a pack, the 25C-LiPo 'might' be good enough as far as discharge capability, or...perhaps the ultra-high C-rate LiPos could be charged-up faster between races?

Anyways, I had planned to make a donation to ES soon, since the ES-stickers are now almost all gone, and the thought just occurred to me that (if nobody objects) I could use that money to purchase a single LiPo brick (shipped to Dogman) to be used by any of the ES participants that has need of it? A few cycles to break-in, test, and race with will not hurt its life...and after the death-race, that particular brick can THEN be sold, and the proceeds donated to ES.

If Thud, Dogman, and LFP could also agree on a connector type, all of the LiPo and chargers at the race will inter-connect as needed.

edit: to be clear, if you are all using nano-tech LiPo, I am committing to paying for one of those. http://hobbyking.com/hobbyking/store/uh ... duct=11941

[John in CR]

I know that the Nano Lipo would be best, but I can't get that stuff cheap enough to sponsor a racer!

Oh well. Anyway, it's not at all certain that I will be even able to do that. I'm just throwing it out there so that you can tell me what size to make the packs IF I can get enough.

IF...

Katou

Since there isn't a weight limit I need 2 blocks 6p27s each with the series strings just long straight lines and paralleled side by side. Factory tabbing is fine because the 12p total won't see more than about 20A each individually, and I don't need anywhere near 10ga on the parallel connections, just dual 10ga for the battery leads on each half of the pack.

[RWP]

OK. I'm in for a nano pack.
Can we group buy this thing to save on shipping?
I love the idea of using it for the race and then selling it with proceeds going back to ES!

[dogman]

It will be pretty hard to guess what people might need after all. But some lipo is a good idea. Just 4 blocks would make at least a 72v pack that could allow sombody to need less recharging.

Power supply to recharge fast is an issue. There are a couple accesible 110 plugs, and I'll be bringing a 3000 watt generator. No 220 that I know of, so if you need it for a high power charger contact the track owner about it.

[bigmoose]

Glad you guys are getting the energy up early for this event! This is to acknowledge the guy who had a "gas" hanging it out last year... his posture in that turn is reminiscent of the great Rossi! (didn't see this good pix before, it's from the motorbicycling.com thread.)

amberwolf1.jpg

[AussieJester]

Amberwolf FTW such a cool pic....the next few frames wouldn't have been to
great for AW though LoL... Good luck this year buddy give it SHiT!!

KiM

[dogman]

Such a great pic. All I caught was the dust cloud later. Don't underestimate that track, lots of good riders get off in the dirt. My first time there I had all this stuff stuck to my shoe from riding on the last 1/2 inch of pavement.

[wineboyrider]

I am going to take my mini motor and fry it! Volt it up and see how long it goes....

[amberwolf]

the next few frames wouldn't have been to
great for AW though LoL...

All I caught was the dust cloud later.

That would be this frame and dust cloud?

32835d1295631749-death-race-2011-76222_456130964499_68268739499_5139598_200807_n.jpg (63 KiB) Viewed 436 times

[John in CR]

That's why I would try to win by overpowering everyone on the straights, dual motor regen braking approaching the curves, and staying somewhat conservative in the curves. I don't trust that there's no sand or dust on that desert track, and I value skin and bones more than the trophy.

[spinningmagnets]

This is one place where regen would be really great. I 'think' since it would reduce brake pad heat, you could charge the curves at a faster pace, and brake later in the curve than gassers who can't use compression-braking (since I assume most of them will have freewheels on their engine-drive).

Also, with electric-drive, the ES-gang would have more low wheel-RPM torque to get "on it" better than the gassers, when coming out of a curve?

I doubt any of the gassers will be using a transmission (though it would be great to see more 3-speed IGH's used to show the best ways to apply them). I would really like it if Thud can bring the 2-speed...

[Thud]

Oh the Motoerd bike guys have transmisions too. There were 2 guys running SBP's "shift Kit" which is a jack shaft reduction to drive a freewheeling crank set up. & yes they can get some speed...both guys DNFed with shift kit related failers in the heats.

I think An HOBO set up or a big battery(dogmans set up) will have an huge advantage over the manual clutched happy time engines....But the Morini powerd bikes witha rpm tunable clutch will be formadable..(I know these power plants) from a dead stop we (electrics)are good..from a 20mph rolling start, the morini is going to be hard to beat.

Add a rider of Dave31's caliber & your gona have to earn it.....maybe I shouldn't have sent him that clutch

I will have a race set up with at least 2-speeds.....2 electric bikes on the trailer..1 fully suspended, another just a clean RC type build...& of course the Gassers for practice & running laps.

Batteries: I leave them in the 6cell brick configuration...& use the stock 4mm bullet conectors to series them, & a bike specific harness for parralelling. I will borrow a generator for the trip so I can Pit where ever I choose.

[AussieJester]

I will have a race set up with at least 2-speeds.....2 electric bikes on the trailer..1 fully suspended, another just a clean RC type build...& of course the Gassers for practice & running laps.
.

Eeeexcellent...i like how ThudSTeR said "with at least" hehe 3 speed dogbox in the works have we having
seen the track last two years on the videos and pics the one with the biggest stones under brakes
and best cornering ability will take this out, as with most forms of racing
... I still think with all his AMA racing experience, 2 speed dogbox and HOBO motored bikes ThudSTaR will be the
one to beat outright, if he can refrain from treating the thang like his 500cc moto-x race bike that is ....

KiM

[dogman]

Win, lose, break or crash it will be a blast. To take 1st will not be easy, the track is difficult and the locals know it well. After the bike is fast, real balls and good tires are still needed.

I doubt I'll be very much faster than last time. Still trying to choke down what I spent on batteries last summer, so no faster wind motors. I've reached the limit of what I can handle with front drive. I simply can't get on the throttle too early in the corner, and brakes? what brakes? No disk this time.

Still, It's as fun riding that track at 53 as skiing the cliffs in Taos was at 33, or piloting balloons at 43. Not to be missed by adrenaline junkies.

[LI-ghtcycle]

Wow, I am envious! I hope that I have some ability to at least start early enough on my own trip to at least spectate!

I would love to be able to put together a race bike once my touring bike is built.

Good luck to all and be sure to have fun!

[MadRhino]

Still, It's as fun riding that track at 53 as skiing the cliffs in Taos was at 33, or piloting balloons at 43. Not to be missed by adrenaline junkies.

You're talking about age or speed there?