E-S Stealth Electric Bike Owners

[Rix]

Great Job Kepler!

Gonna post some videos? I would like to see it in action. Beutiful work. Looks light and tough.

Rix

[Justtoby]

I think John should make this as a "club sport" model and sell it without any battery and a limited warranty on the motor. By selling it ex battery it would be a lot cheaper and allow people to do what they want, the image of stealth can be protected as long as the club sport was clearly differentiated, I.e st colours and maybe cs cutouts in the frame?

Porsche did this in the 90s with the 968 cs, in white, blue and yellow, they are iconic track cars now.

[Kepler]

Wow, that bottom bracket is so high up

You dont miss a thing do you full-throttle

I am playing around with the geometry a bit to suit my long legs. I think in hind sight, the stock height is better and will probably go back to that.

[Kepler]

I notice you have gone for triple crown forks when this is mainly a road bike, I prefer the look but surely normal forks would have given more turning circle for town riding plus even less weight?

The plan was always to go with a single crown fork for the exact reasons you have just mentioned. However, i prefer the look of the triple crown forks and figured I would regret it if I went with the singles. Reality is that there is only about 600g between the two types of forks and with the Fighter's quite narrow frame, the turning circle is quite reasonable. Significantly better turning circle then my Bomber

[Kepler]

Looking good and at 2000w there is room for another 1000w burst power without any issues.

Just over 60kmh is good. I bet it rides like a regular bike. I found the freewheel loosens up the more you use it. The combo would be great for bursts of power then coasting. and the low gear and light weigh would make it good on a technical section . Keen to see the consumption data I think you will be happy with it.

Video would be great

Nice build.

Thanks Kurt.
Another 1000W would be fun. Might give that a go in the future. Need to see how well the motor and little 6 Fet internally mounted controller stand up to 2000W first though.

[Kepler]

Great Job Kepler!

Gonna post some videos? I would like to see it in action. Beutiful work. Looks light and tough.

Rix

Cheers Rix.

Hopefully will have some video soon. The plan is to get some comparison video of the bike side by side with a stock Fighter to see if mine can keep up. It will be interesting.

[Paul_G]

http://www.bikerumor.com/2012/04/22/soc ... k-upgrade/

NEEDLE BEARING SHOCK UPGRADE?

That would be a good idea to do. NE1 know where to order for the Bomber?

I loosened up both shock mounts and give them some silicone spray and you can feel it rides far better so the needle bearings would be great. I left them loose as the nylon nuts should be fine. Amazing ride diff just with them loose.

[full-throttle]

That's not news - BOS been offering it for a while

Only the bottom shock mount on the Bomber would need one if any - small-bump sensitivity and hub motors will never coexist

Regular maintenance will def help as you said, just keep that silicone spray away from the brakes

[Paul_G]

That's not news - BOS been offering it for a while

Only the bottom shock mount on the Bomber would need one if any - small-bump sensitivity and hub motors will never coexist

Regular maintenance will def help as you said, just keep that silicone spray away from the brakes

Fantastic and thanks

Do you know what size to order for the Bomber shock?

[full-throttle]

BOS don't make one for DNM, only for their own shocks. You would have to fab one yourself. The bushes are probably standard metric size, like 16mm. Then is simply a matter of getting the right size needle bearings to fit..

[Kepler]

Starting to gather a bit of a picture of the economy of the light weight Fighter. Using my stock standard ride to work, the following figures were recorded. 15Whr/km @ an average speed 38.3 kph. Although 15Whr/km ins't exactly startling, the average speed achieved for this economy makes the figures quite reasonable.

In comparison, I find that riding at an economy of 15Whr/km on the Bomber sees an average speed of around 32kph under similar conditions.

Figures are based on light pedal assist and mildly undulating road conditions.

It would be interesting see some comparison data against a stock Fighter especially at the same average speed.

[Kurt]

That is good consumption considering the average speed. I would say my trike would weigh about the same although I max out at around 52kmh 20" wheel and 15s lipo . I will give have a go at riding with a average of 38kmh and see what i come up with.

I think if you are going to do a real test between the stock fighters it would be best to have the same rider or perhaps both riders around the same weight and no peddling and following each other to keep the comparison some what acculturate.

through some hills into the ride and watch the stock fighters consumption go up compared to the geared hub.

Keep the info coming and vids would be great .

Kurt

[Cowardlyduck]

It would be interesting see some comparison data against a stock Fighter especially at the same average speed.

Just a few pages back I posted my longest ride yet on the Fighter.
http://endless-sphere.com/forums/viewtopic.php?f=6&t=23996&start=1515#p557796

I managed 11.9Wh @ 400W with an average speed of 28.8kmh over 82.6km. That was with constant (but not hard) pedalling as well.

I reckon I could approach similar results if I upped the wattage to around 800W.
I realise you probably didn't have to power limit to get that kind of result though. I tend to find my throttle is either on or off though, so I need something else to help me manage my power usage.

Cheers

[Kepler]

They were good numbers too. I dont think there will be that much in it compared to standard Fighter. I would guess maybe 20% at best. It would be great if you could do a run that averaged 38kph for a closer comparison.

I did an economy run today. The light weight makes it much more viable to pedal a reasonable amount. Averaged 27kph and 6.2 Wh/km.

[remf]

Starting to gather a bit of a picture of the economy of the light weight Fighter. Using my stock standard ride to work, the following figures were recorded. 15Whr/km @ an average speed 38.3 kph. Although 15Whr/km ins't exactly startling, the average speed achieved for this economy makes the figures quite reasonable.

In comparison, I find that riding at an economy of 15Whr/km on the Bomber sees an average speed of around 32kph under similar conditions.

Figures are based on light pedal assist and mildly undulating road conditions.

It would be interesting see some comparison data against a stock Fighter especially at the same average speed.

Love the colour scheme, the efficiency and especially the 28 kg weight. Mine's not exactly stock but I generally see around 23Wh/km averaging ~40 kph on mixed flat & hilly areas.

[Kepler]

Took the new Fighter over to Stealth today to show John and Al. Managed to get a bit of footage of the bike in action with Al riding it and doing what does best. As you can see, the little BPM has plenty of torque and has no problems popping the bike onto its back wheel and holding it.

[Cowardlyduck]

Took the new Fighter over to Stealth today to show John and Al. Managed to get a bit of footage of the bike in action with Al riding it and doing what does best. As you can see, the little BPM has plenty of torque and has no problems popping the bike onto its back wheel and holding it.

Looks nice.
How does it go off road and up long steep hills?

Cheers

[Justtoby]

Thanks for the vid, it looks great.

Did you put helium in the front tyre?......Al makes me mad as I really want to learn to wheelie like that.

[Lenk42602]

Working on the custom controller for the Fighter at the moment. The controller has been up speced with 4110 Fets and 100V components. All HV wiring has been done in 12gauge silicon cable which should be plenty for the power output. High current solder traces are all beefed up with solid copper bar too. As you can see, the controller is tiny and a piece of cake to install internally. With the bike frame being used as the FET heatsink, hopefully heat will be kept under control. Should have all the mods completed tonight ready for installation tomorrow.

Kepler,

Would you mind providing any additional detail about the controller you put together for the BPM? What did you start with? Other than the fets, larger cap, bigger wires, what else did you do to handle the increase in voltage?

Thanks,

len

[ManxE]

Well done Kepler - it looks really agile. Like a Velociraptor compared to the Bomber's T-Rex!
Can Al also do stoppies on it now that the back wheel has less weight?
I guess John & Co were suitably impressed!

[Kepler]

Took the new Fighter over to Stealth today to show John and Al. Managed to get a bit of footage of the bike in action with Al riding it and doing what does best. As you can see, the little BPM has plenty of torque and has no problems popping the bike onto its back wheel and holding it.

Looks nice.
How does it go off road and up long steep hills?

Cheers

I have only done a bit of off road work with it but has no trouble climbing anything I throw at it so far. Plenty of short steep stuff but no long steep hills tested yet.

[Kepler]

Thanks for the vid, it looks great.

Did you put helium in the front tyre?......Al makes me mad as I really want to learn to wheelie like that.

lol, makes me sick too. No fear and great skills. He has plenty of other party tricks in his book too (ex trials rider)

[Kepler]

Working on the custom controller for the Fighter at the moment. The controller has been up speced with 4110 Fets and 100V components. All HV wiring has been done in 12gauge silicon cable which should be plenty for the power output. High current solder traces are all beefed up with solid copper bar too. As you can see, the controller is tiny and a piece of cake to install internally. With the bike frame being used as the FET heatsink, hopefully heat will be kept under control. Should have all the mods completed tonight ready for installation tomorrow.

Kepler,

Would you mind providing any additional detail about the controller you put together for the BPM? What did you start with? Other than the fets, larger cap, bigger wires, what else did you do to handle the increase in voltage?

Thanks,

len

Everything you ever wanted to know about the controller is right here http://endless-sphere.com/forums/viewtopic.php?f=2&t=12616&hilit=6fet Once you read this you will understand why I was confident to go down this path. I think I am running things well within the controller's capabilities.

[Kepler]

Well done Kepler - it looks really agile. Like a Velociraptor compared to the Bomber's T-Rex!
Can Al also do stoppies on it now that the back wheel has less weight?
I guess John & Co were suitably impressed!

Does stoppies super easy. I will get Al to do some next time I am over at the factory. With the forward battery position, weight distribution is close to 50/50. I will also get Al to show us a few of his other tricks. One I like is when he rides up to a wall with the front wheel up in the air, parks and balances for a second at a 45 degree angle, then flips around and rides off.

Both John and Al I think were a little surprised just how much torque this setup had. I am sure it has him thinking. Essentially I am unofficially beta testing some new setup's for him which at the end of the day is good for everyone.

[Kurt]

Looks great,

Nice little zit.. zit... zit sound from the motor but nothing aggravating or over powering. In regard to controllers I am using a stock 45a 12 fet 9c controller I purchased of john a while back and have had no issues with 2800w peeks. i don't see you having any issues with a modified controller with 4110's .These motors aren't hard on controllers.

Kurt