you can PM him & get some better details.Hey all,
Once again thanks for all the comments. Definitely couldn't have done it without all of the info on the ES forums from true EV pioneers - tinkerers that figured out what works and what doesn't and shared their work! The depth of knowledge and commitment to ebikes is incredible here.
Now for some stats:
12 laps in the main event, 0.79 mi laps, starting voltage 76.1v (4.23 v/cell), Vmin 66.7, Amax 56.7, maxS 44.3, Ave S. 31, 6.8ah 483wh consumed, 47 wh/mi.
Drive:
1.7:1 8mm pitch, 15mm width primary belt reduction with ENO hidden inside 48T pulley, 6.15:1 219 chain secondary, sprocket on rotor mount of hub, total reduction 10.5:1, Turnigy 130kv 80/100 with external halls at 17.1degree spacing
Controller:
ebikes.ca 40 amp 12 fet infineon, modified resistors for high voltage, and shunt soldered about 15-20% of its length
Batteries:
Secret lithium ion pouch cells 18S2P, 20ah x 66v.
Bike weight unknown, but we guessed 60-65lbs.
It definitely turned out way better than expected, and combined with a 140lb former MTB racer turned out to be fast enough. As I posted after practice, Thud was crazy fast, and probably would have taken the win if his controller held together. LFP had some serious power on board and likely would have been a contender too.
It was really interesting to see where I could gain on the Morini ridden by Alex00 (2nd place) and where he pulled away. The sweet spot of his power band seemed to be around 25-35 mph. I was quicker up to 25 and over 35 I think. I was pedaling like crazy out of the corners, though. Basically pedaling whenever at max throttle and under 30-35mph, tucking the rest of the time.
Anyways, looking forward to seeing this ebike racing thing catching on.. or maybe just becoming slightly less obscure than it is now
PD
amberwolf said:I didn't notice this before, but is that a dark line on the track itself that my rear tire crosses just as it slides out from under me? Because it looks like the slick asphalt repair lines I see on regular roads, as does the lateral one just past where I wiped out.
Not that I probably wouldn't have slid out without it, as I was already having a lot of trouble controlling the bike just then, but seeing that I think it didn't help me any if that's what it is. :lol:
John in CR said:Dual hubbies or an actively blown hubbie were the right hub answer this year, but no one had one.
amberwolf said:In my digging for my crutches on Monday, I found some more parts to use to build the next DR bike from, though.
Uncle Ron said:Any thoughts on this?
amberwolf said:It would eliminate racers like me: CB2 weighs just about what I do. Even the new bike won't weigh that much less, if any, just because it's also meant to be a cargo bike and has a lot of frame for stiffness (whcih is also required to hold the heavy batteries I have, and keep the motor chain from twisting the frame and derailing like it used to on CB2).
EDIT: wait, I think you mean the opposite of what I thought you did: Do you mean that the bike has to weigh at least half of what the rider does? OR that it can't weigh any more than half?
Uncle Ron said:amberwolf said:It would eliminate racers like me: CB2 weighs just about what I do. Even the new bike won't weigh that much less, if any, just because it's also meant to be a cargo bike and has a lot of frame for stiffness (whcih is also required to hold the heavy batteries I have, and keep the motor chain from twisting the frame and derailing like it used to on CB2).
EDIT: wait, I think you mean the opposite of what I thought you did: Do you mean that the bike has to weigh at least half of what the rider does? OR that it can't weigh any more than half?
Amber,
Wait, I meant what you originally thought I meant. (g) First let me say that what you are doing for practical and recycling reasons makes you an ES poster who I read with alacrity and fascination. You are the resident ES Cuban, keeping his personal transport together with baling wire, spit and welding skills. Bravo! But a racing bike it ain't, and I probably shouldn't say this, but you're dangerous to yourself and others when it comes to the main event when all the marbles are on the line, and those who came to race and possibly win are pushing the envelope to the max. A cargo bike doesn't belong there being lapped 2, 3 or more times and getting in the way of those who are jockeying for the win. You're probably an asset having fun in the preliminary heats and providing a bigger than normal obsticle for riders with serious racing machines to learn by adapting to. But when everything is on the line and a bump here and a nudge there may be the difference, you'd be forcing others to take too much risk. That's just the opinion of someone who doesn't and never will have any skin in the game and I'm perfectly happy for you or anyone else to tell me I'm full of it.
The main reason I brought this up at all was seeing that Paul's bike was less than half his weight and thinking that this metric might be a way to even things up for the bulkier riders a bit when perhaps the sport gains some traction and must carry more rules.
Gordo said:There is very little risk to other riders from a slow vehicle that keeps his line. A skilled rider that knows how and is being a menace is a real danger of huge proportion. It is up to the track stewards to make a black flag judgement, not us.
JWITIK.
dogman said:Turn out for the undead race was pretty dissapointing. Even the DR was lower than last year. 5-6 buck gas next fall won't help either. Maybe we could still have a more informal fall gathering, where we just get to ride together on the track in between kart rentals next fall?
I for one, HUGELY appreciate Dave for keeping the DR alive.
...5-6 buck gas next fall won't help either...I for one, HUGELY appreciate Dave for keeping the DR alive...
knoxie said::lol: hey uncle Ron are you sure you are not the British comedian Alexei Sayle?
knoxie said::lol: hey uncle Ron are you sure you are not the British comedian Alexei Sayle? do a Google image search! separated at birth if not
knoxie said:Oh yes he is still about, he shows up from time to time on the tele, he used to live about 5 miles from me in a village called moreton pinkney, used to see him out and about in an old e-type jag, very funny man indeed 8)