TylerDurden
100 GW
100m = soccer field or football field.
E.D.D.R.V.N Acceleration contest !
- Thread starter Doctorbass
- Start date
AussieJester
1 TW
Having not had the pleasure to ride an e-bike i have no idea how long it takes to get to maximum speed suffice to say the fastest human over 100m reaches ~41km/hr or 26 mph for you Americans...Soooo im guessing your 8 seconds might be a little closer to the mark as i would think? the the Docs e-bike has the ability to exceed that speed before the 100 meter mark?
Doctorbass
100 GW
You all guys are very close to the answer!
Now i'm going in vacation for 5 days.
When i'll return, i promise i'll post the answer and also will post a video of my test.
From now i can say it's between 6.81 and 9.81 seconds
I really think if i finally built my drag race battery pack that i plan with 30s 2p of A123, the bike will be lighter so i could get maybe 0.5 to 0.7sec faster than now by replacing my present 1500Wh konion pack(17kg) with a new A123 pack of 4.2kg !
Note: the method i used to measure is my GPS for lenght measurement that i did in both directions to ensure it's accurate. and i drew two white line on the street ground. I used a standasrd chronometer and verified with the graph log of waypoint of my Garmin Legen CX GPS connected to my pc.
Doc
Now i'm going in vacation for 5 days.
When i'll return, i promise i'll post the answer and also will post a video of my test.
From now i can say it's between 6.81 and 9.81 seconds
I really think if i finally built my drag race battery pack that i plan with 30s 2p of A123, the bike will be lighter so i could get maybe 0.5 to 0.7sec faster than now by replacing my present 1500Wh konion pack(17kg) with a new A123 pack of 4.2kg !
Note: the method i used to measure is my GPS for lenght measurement that i did in both directions to ensure it's accurate. and i drew two white line on the street ground. I used a standasrd chronometer and verified with the graph log of waypoint of my Garmin Legen CX GPS connected to my pc.
Doc
AussieJester
1 TW
Doc...i was thinking a 3rd section for the 3 wheel brigade might be in order?
TylerDurden
100 GW
sharing locations test
http://www.gmap-pedometer.com/?r=2084167
http://maps.google.com/maps?hl=en&ie=UTF8&ll=42.241592,-83.692131&spn=0.010405,0.022144&z=16&layer=c&cbll=42.237217,-83.692686&panoid=TxhcfrTgl2rAbTzQBhfBXA&cbp=1,34.63547063723286,,0,0.13586313643179135
http://www.gmap-pedometer.com/?r=2084167
http://maps.google.com/maps?hl=en&ie=UTF8&ll=42.241592,-83.692131&spn=0.010405,0.022144&z=16&layer=c&cbll=42.237217,-83.692686&panoid=TxhcfrTgl2rAbTzQBhfBXA&cbp=1,34.63547063723286,,0,0.13586313643179135
Link
1 MW
AussieJester said:
Hmm...don't see why that couldn't be included in whichever controller division it would belong in if it only had two wheels.
TPA
10 kW
What's the X in X.81?......Lets see....from kinematics
v^2=v0^2+2*a(x-x0)
v is known (15.5833 m/s)....v0 is known (0).....x is known (100m)......x0 is known (0). So solve for a.
a= (15.5833m/s)^2 / 2*100m
a= 1.2142 m/s^2............So now we know a constant acceleration.
Next equation
x-x0=v0*t+.5*a*t^2
which simplifies to:
100m=.5*(1.2142m/s^2)*t^2
Solve for t
t=sqrt[100m / .5*(1.2141m/s^2)]
t=12.83s
I think ol' doc is yanking all of your chains.
Of course acceleration may not have been constant, and he may have hit maximum speed before the end of 100m. In both cases the calculations are out the window.
v^2=v0^2+2*a(x-x0)
v is known (15.5833 m/s)....v0 is known (0).....x is known (100m)......x0 is known (0). So solve for a.
a= (15.5833m/s)^2 / 2*100m
a= 1.2142 m/s^2............So now we know a constant acceleration.
Next equation
x-x0=v0*t+.5*a*t^2
which simplifies to:
100m=.5*(1.2142m/s^2)*t^2
Solve for t
t=sqrt[100m / .5*(1.2141m/s^2)]
t=12.83s
I think ol' doc is yanking all of your chains.
Of course acceleration may not have been constant, and he may have hit maximum speed before the end of 100m. In both cases the calculations are out the window.
Link
1 MW
I think I need to get out more. I have no idea of how long a football field or a soccer field is, either. >_<
How many bowling lanes is that? :lol:
How many bowling lanes is that? :lol:
scottclarke
100 W
I was just out doing some practice runs - I need to do this since the controller cuts out under hard accel at low speed and can't run below 3mph or so - making it a peddle start on a a very soft full suspension frame - can't really put any power down with the legs
It's started raining now so I have aborted.
Doc, you really need to shed some weight :wink: - gonna have to wait for the vid for the times though!
Scott
It's started raining now so I have aborted.
Doc, you really need to shed some weight :wink: - gonna have to wait for the vid for the times though!
Scott
recumpence
1 GW
OK, now I am interested (Dee Jay, consider yourself nodded back) :wink:
Hmm, I like this idea. I know I can hit 38mph in 330ft (gearing limited). I wonder how hard I really cann accellerate with my spindly recumbent wheels and light weight setup.
Man, now I am freakin. I need to do some testing!
Matt
Hmm, I like this idea. I know I can hit 38mph in 330ft (gearing limited). I wonder how hard I really cann accellerate with my spindly recumbent wheels and light weight setup.
Man, now I am freakin. I need to do some testing!
Matt
RLT
10 kW
Feet, Yards, Meters,... Bah. BORING!
If you folks were really serious about this, for the distance, you'd use FURLONGS
http://en.wikipedia.org/wiki/Furlong
And measure your times in MICROFORTNIGHTS
http://en.wikipedia.org/wiki/FFF_System
If you folks were really serious about this, for the distance, you'd use FURLONGS
http://en.wikipedia.org/wiki/Furlong
And measure your times in MICROFORTNIGHTS
http://en.wikipedia.org/wiki/FFF_System
RLT
10 kW
Or maybe measure the time in nanolustrums?
Ben
100 W
I reckon doc's time is either 5 or 6 secs.
Steveo was running his X5304 on 100A in a 20" wheel and he did 50k's in around 5s flat.
Steveo was running his X5304 on 100A in a 20" wheel and he did 50k's in around 5s flat.
It would be better if you just used like .15 mile or .25km or whatever it comes out to so everyone can use their speedometers on there bikes to record the distance without busting out a tape measure and marking lines on pavement and getting run over in the process.
TPA
10 kW
Ben said:
Doc said his top speed was 56.1 kph which is about 15 1/2 meters per second.
from very basic physics - distance = rate X time, and using algebra, time = distance/ rate
just for the sake of argument lets suppose he did not start from zero but did 56.1 kph the entire 100m.
time=100m/15.5m/s
time = 6.45s
so you know his time has to be much higher than that if he started from zero.
Ben
100 W
Ooh, good call!
I'll change my guess to either a 8.81s or 9.81s run.
I'll change my guess to either a 8.81s or 9.81s run.
dirty_d
10 kW
Dee Jay, that bike path is a major sausage fest!
Ypedal
100 TW
** Reserves Spot !!! 
Muh lithium are chargin, and the BMX is ready ! And i'm on vacation ! 8)
Muh lithium are chargin, and the BMX is ready ! And i'm on vacation ! 8)
AussieJester
1 TW
Link said:
VERY much so...
Link said:
5.6
Link
1 MW
Hmm, in light of TPA's post and the knowledge that 100m=~6 bowling lanes, I revise my guess to 12.
Daniel828
100 mW
Hi, I've been reading this for a couple of days. I was thinking of getting in on this but was nervous about being blown away by you guys.
I think I have an honest shot at being a contender. I don't know how to post vids. on this site. I have a video on youtube, do a search for danieljohnboy.
When I was coming by the camera, I had started about 330 ft. away and was doing 37.8 mph (quick glance at speedo as I passed) and slightly up hill.
I will put together a proper 330ft. if thats what measure we are using.
I think I have an honest shot at being a contender. I don't know how to post vids. on this site. I have a video on youtube, do a search for danieljohnboy.
When I was coming by the camera, I had started about 330 ft. away and was doing 37.8 mph (quick glance at speedo as I passed) and slightly up hill.
I will put together a proper 330ft. if thats what measure we are using.
scottclarke
100 W
Daniel - its not a fight for 1st place!
Congrats to that man for sure but whatever position you finish in it will be a worthwhile endeavour - not least to show the different performance levels with different setups and to show what others could achieve with your setup!
Scott
Congrats to that man for sure but whatever position you finish in it will be a worthwhile endeavour - not least to show the different performance levels with different setups and to show what others could achieve with your setup!
Scott
safe
1 GW
- Joined
- Dec 22, 2006
- Messages
- 5,681
I know when I was running in 36 volt mode that I was doing a quarter mile at about 40 mph top speed on the exit. Now I'm up to 48 volts and a lot faster. Let's see... 330 ft is how much in terms of 1/10ths per mile? The only onboard measuring device I have is the odometer.
I might be able to beat 38 mph, not sure.
Okay, just checked:
100 meter = 0.06 mile
...so about half of one tenth of a mile. That's really short.
0.25 mile = 402 meter
...so I need to mark out a length one fourth of a quarter of a mile. (that's spitting distance for watermelon fans by the way :lol: )
I liked the old quarter mile distance because it's like drag racing...
This length is so short that my bike is just starting to build up it's revs... I don't even hit the peak of the powerband until I hit 30 mph.
I might be able to beat 38 mph, not sure.Okay, just checked:
100 meter = 0.06 mile
...so about half of one tenth of a mile. That's really short.
0.25 mile = 402 meter
...so I need to mark out a length one fourth of a quarter of a mile. (that's spitting distance for watermelon fans by the way :lol: )
I liked the old quarter mile distance because it's like drag racing...
This length is so short that my bike is just starting to build up it's revs... I don't even hit the peak of the powerband until I hit 30 mph.
Daniel828
100 mW
Gotcha Scott. Wasn't trying to start a fight. Sorry it came across that way. 
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