What's your top speed?

[oatnet]

I wonder what is limiting your top speed?

Between the upright seating position and the "freeradical" bags flapping in the air, my xtracycle has more drag than Hollywood blvd.

-JD

 

[Floont]

...my xtracycle has more drag than Hollywood blvd.

Now that is funny! :lol:

 

[icecube57]

...44.7mph on my xtracycle with a kelly driving a 5304 at 90a from 88.8v/15ah LiFe...

Hmmm... At 88.8V, a 5304 should be getting significantly higher speeds than my 5304 at 72V, although my highest speeds are on a fresh charge and the batteries are really at 78.2V (plus my tires are over-pressured to reduce rolling resistance). Today, I hit 42MPH on a flat road, no wind. The 42MPH is verified by GPS.

I wonder what is limiting your top speed?

Ive hit 42mph on 44v on mt 5303 with the 120% timing advanced on my controller on level ground on over pressured Bell Cruiser Slicks 26x 1.95 tires at 50-60 psi

 

[Floont]

Phase 1:
Video of me deliberately riding by a Sheriff's radar display at 42/41MPH:

[youtube]I-hlsD4hEPE[/youtube][/quote]

 

[Whiplash]

Nice! I have yet to hit the 40MPH mark, I have one of those permanent ones right by my house, makes a great test road, nice and flat too! I have hit 39 cranking like I am going to fall off the dam bike, I need taller gears! LOL!

 

[torker]

I put my recumbent 2806/20" on 48v one time and ran 25 mph. It feels better on 36 v @ 18 mph. though. No susp. and crappy roads is keeping me from pushing it yet. If I could put together a Full susp. long wheelbase like Spinmags I might get the itch to up the speed :lol:

 

[dogman dan]

9c 2807, 20s lipo, 26" wheel. I just barely make it into the 40 mph club for the first mile. After that, 38 mph is about the top. Flat ground no wind, Actual speed might be 42 mph one direction, and 38 mph the other. There is not usually perfectly flat ground near my house.

 

[Doctorbass]

UPDATE from july 2010:

MAX speed ON FLAT * Doc reached: 6 6 . 0 m p h (106kmh)
using 10.8kW continuous for 30 sec

MAX speed UP HILL ** Doc reached: 5 4 . 6 m p h (88kmh)
using 12kW continuous on an X5 for 10 sec



What that mean??

THat's only 17% diff between flat ground and up hill !!!! .. eventhou it'as above 50mph !!

That's what i call POWERBAND AND TORQUE !! :wink:


* The video that show that performance:http://www.youtube.com/watch?v=j5qqNMfIZe8

**The hill is this one:
http://maps.google.com/maps?f=q&sou...=YWhSHFRHQ-3ViserDJfOYw&cbp=12,350.8,,0,19.21

Doc

 

[Kingfish]

UPDATE from july 2010:

MAX speed ON FLAT * Doc reached: 6 6 . 0 m p h (106kmh)
using 10.8kW continuous for 30 sec

MAX speed UP HILL ** Doc reached: 5 4 . 6 m p h (88kmh)
using 12kW continuous on an X5 for 10 sec

<snip>

Doc

Doc, You da Man 8)

...and I da boy

An inspiration to us all <nods>

~KF

 

[Floont]

...
MAX speed ON FLAT * Doc reached: 6 6 . 0 m p h (106kmh)
using 10.8kW continuous for 30 sec

MAX speed UP HILL ** Doc reached: 5 4 . 6 m p h (88kmh)
using 12kW continuous on an X5 for 10 sec...

I am in awe!

What voltage are you running - 100.8v?

What gauge power and phase wiring do you use? I can't get close to your power levels out of my 5304. When I approach higher amps (>100), my voltage drops - expected to some degree, but not to the levels that I am seeing. It seems to be pointing to insufficient power and phase wire sizing or connector losses.

FA

 

[Doctorbass]

...
MAX speed ON FLAT * Doc reached: 6 6 . 0 m p h (106kmh)
using 10.8kW continuous for 30 sec

MAX speed UP HILL ** Doc reached: 5 4 . 6 m p h (88kmh)
using 12kW continuous on an X5 for 10 sec...

I am in awe!

What voltage are you running - 100.8v?

What gauge power and phase wiring do you use? I can't get close to your power levels out of my 5304. When I approach higher amps (>100), my voltage drops - expected to some degree, but not to the levels that I am seeing. It seems to be pointing to insufficient power and phase wire sizing or connector losses.

FA

You dont need dual X5 to get these performance level :wink: .. Dual X5 mean one on the fork and i would avoid that unless you make a STRONG fork and dropout... otherwise the result could end up to make you have to upgrade your avatar pics for a worst case!

Yes i'.m using 24s lipo 15Ah battery and the CA read often above 200A burst during fast speed or hard acceleration.

i'm using 8 gauge wire cause i wnted a setup as light weight as possible. I have 6 gauge, 4 gauge and up to 3/0 gauge from old car audio SPL projects... but it's to heavy.

I also use the great PP75 powerpole connectors and a 18 fets doc modded controller as well.

Doc

 

[Floont]

You dont need dual X5 to get these performance level :wink: .. Dual X5 mean one on the fork and i would avoid that unless you make a STRONG fork and dropout... otherwise the result could end up to make you have to upgrade your avatar pics for a worst case!

I use a front x5304 already. I have one strong steel torque arm on the left side of the front fork. I'm thinking of adding another for the right side since I've been incrementally increasing power (and speed - I'm up to 47MPH pre-wreck). When I started this hobby, I wasn't into acceleration at the time, thus the front hub motor.

Yes i'.m using 24s lipo 15Ah battery and the CA read often above 200A burst during fast speed or hard acceleration.

I concluded my main problem is that I'm using SLA batteries which really can't do more than about 55 amps sustained. I can get a burst of over 100 amps out of them though. I'll be upgrading the batteries soon.

i'm using 8 gauge wire cause i wnted a setup as light weight as possible. I have 6 gauge, 4 gauge and up to 3/0 gauge from old car audio SPL projects... but it's to heavy.
I also use the great PP75 powerpole connectors and a 18 fets doc modded controller as well.
Doc

My power and phase wiring are a lighter gauge, but I can't remember... I'll have to check it. 8 gauge is nice and beefy and I'll check into those connectors. Mine look like their rated for 30 amps which is terrible!

Thanks for your response. You are quite an inspiration!

FA

 

[999zip999]

Hey floont, How about a fresh pic.. Are you running a alumiun bike with the batteies on the top of rear rack ? Maybe a full face helmet next.

 

[Floont]

Hey floont, How about a fresh pic.. Are you running a alumiun bike with the batteies on the top of rear rack ? Maybe a full face helmet next.

I assume you mean a new avatar, not a new picture of how much I have healed since the wreck. Since Photobucket has removed the photo for no apparent reason (it doesn't violate their terms of use), someone must have complained about it; it's probably a good a time as any to change it soon.

My bike: Steel frame, forks, etc. Batteries are on panniers as low as they can be mounted on the axles. The controller is mounted on top of the rear rack. I want my center of gravity as low as practical.

When my MET full face helmet arrives, I'll change my avatar.

FA

 

[dogman dan]

New top speed on the racing bike. Now at 24s lipo, 101v, 46.5 mph, 45 going back on the same road, so call it 45.

Not drag race speed, but pretty fun. 9c 2807 motor, Lyens 12 fet controller stock settings (40 amps), 24s 10 ah 30c turnigy battery.

Time to drill some holes in the covers. 8)

Yeah, ridng it with a motorcycle helmet. And two pair of pants, and gloves with carbon fiber knuckes.

 

[wasp]

New top speed on the racing bike. Now at 24s lipo, 101v, 46.5 mph, 45 going back on the same road, so call it 45.

Not drag race speed, but pretty fun. 9c 2807 motor, Lyens 12 fet controller stock settings (40 amps), 24s 10 ah 30c turnigy battery.

Time to drill some holes in the covers. 8)

Yeah, ridng it with a motorcycle helmet. And two pair of pants, and gloves with carbon fiber knuckes.

nice dogman any vids?

 

[dogman dan]

Vids of my 46 mph bike over here. More to come in a month after the Spooky Tooth un dead race.

http://endless-sphere.com/forums/viewtopic.php?f=6&t=18644&start=105

 

[Kingfish]

Update:
Thinking, perhaps too deeply, I presume the OP was talking about bicycles

In 2010 December I began commuting on a fairly flat route; mild changes in elevation following a long lakeside road with one < 100 foot hill in the middle. The P0 ebike consistently topped out at 33 mph flat running 15S/63V LiPo FWD 9C 2806. The speed is validated by a total of 4 roadside speed indicators (2 in each direction). Downhill maximum was 45 mph certified by eyeballs last July 2010. CA has reported higher numbers on occasion though in my experience the belief is that the front hub loses traction and provides a false reading.

P1 with traction tires has consistently hit 34 mph on the same road given above. Although last week I hit the oatmeal pretty hard before leaving late for a meeting and I managed to squeak out 35 mph. I can hardly wait till when it warms up and try it again with hookworms!

Into the wind, KF

 

[John in CR]

Update:
Thinking, perhaps too deeply, I presume the OP was talking about bicycles

If that's case then I'm the only one with a street legal bicycle, so you guys must be recording your speeds on dirt paths. My "bicycle" hits 60mph regularly with a hubbie in a 20" wheel using a 20s Konion pack sagging to 75V or less.

 

[Kingfish]

Update:
Thinking, perhaps too deeply, I presume the OP was talking about bicycles

If that's case then I'm the only one with a street legal bicycle, so you guys must be recording your speeds on dirt paths. My "bicycle" hits 60mph regularly with a hubbie in a 20" wheel using a 20s Konion pack sagging to 75V or less.

Impressive John! What is the freewheel?

I am thinking about next payday ordering up a road-bike racing crankset and try to eak out another 3-6 mph. I'd like to make the 40mph Club on a flat dirt road :wink:
(well... there's dirt beneath the road anyway...)
~KF

 

[John in CR]

I don't know the freewheel speed, because my speedometer is on the front wheel, but the Kv of the motor is 16. I had the rare problem of having to fool the speedo into displaying the speed because it was too high. The damn thing would blink out when I got to 100kph whether I had it displaying mph or not. To fool it I had to enter the setting for the wheel circumference by 1.609, so the kph speed displayed is now the mph speed. I've checked it against my GPS, so I know it's accurate. After I go to a higher voltage a bigger wheel, and add a bit of aero, so I have something worthy of measurement, I'll post a video. 8)

 

[dogman dan]

26s on the racing bike got me 51.6 mph. But that was on a very shallow downhill. About 48 mph once I average in a return the opposite direction.

Gonna have to pop a quick run at 28s, just to get legitimately into the 50 mph club. Gotta do it when roads are pretty empty, except for occasional test runs, or lower voltage riding this race bike is a track animal.

Man, just small ripples in the pavement are REALLY felt at 50 mph on a no suspension race bike. No frame flex issues though.

 

[dequinox]

Remind me DM, what motor and controller were you using on the racer again? Was it the Aotema? I recently acquired one that is brushed tho I sort of assume yours is brushless...

26s on the racing bike got me 51.6 mph. But that was on a very shallow downhill. About 48 mph once I average in a return the opposite direction.

Gonna have to pop a quick run at 28s, just to get legitimately into the 50 mph club. Gotta do it when roads are pretty empty, except for occasional test runs, or lower voltage riding this race bike is a track animal.

Man, just small ripples in the pavement are REALLY felt at 50 mph on a no suspension race bike. No frame flex issues though.

 

[TheKraftyRhino]

165MPH 7 seconds in the 1/4 mile.............................

http://www.youtube.com/watch?v=8l0bxRu81IA



JK but would be cool if that was my E-Bike

 

[Doctorbass]

165MPH 7 seconds in the 1/4 mile.............................

http://www.youtube.com/watch?v=8l0bxRu81IA



JK but would be cool if that was my E-Bike

Attach it to the back of that beast !! :wink: .. you'll have a 165MPH ebike

Doc