E-S Stealth Electric Bike Owners

Show off your E-bike creation here.
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Cowardlyduck   100 MW

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Re: E-S Stealth Electric Bike Owners

Post by Cowardlyduck » Aug 26 2019 7:44am

This is true, but the 370mm was already pushing it with the 21700 cells as that wasn't factoring in padding and discharge wires etc which would probably push it to 380mm

Using 18650's at 362mm makes things much more manageable. 20S vs 21S isn't a big deal IMO and worth it if we want max capacity/range.

20S14P using 18650's makes a ~3.55kWh pack and 14 of the 18650's will complain (sag) much less than 10 x 21700's therefore increasing the life of the pack.

I know it's possible to make the series connections less 'neat' and make an asymmetrical pack, but I'm probably going to be making a few of these so also need to make them cost effective (aka simple) to make.

What do you think, would the split pack idea fit at ~368mm? I'm guessing the 362mm will probably blow out to 368mm once padding and wires are added.

Cheers
Custom made 18650/21700 battery packs

Modified Stealth Fighter - Force air cooled motor @ 6KW, Adaptto Mini-E. 49AH, 52V 18650 - 2.5Kwhr
Cowardlyducks - Stealth Fighter Videos

BikeE recumbent commuter - 9C, 6Fet Grinfineon, internal 17AH, 52V, + on-board solar.

Ebike Garage - My YouTube Ebike ramblings.

High Power LiPo wiring harnesses - 4P - XT90, HXT4mm, 5.5mm. 200Amp+ capable. Global shipping.

Crossy   1 mW

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Re: E-S Stealth Electric Bike Owners

Post by Crossy » Aug 26 2019 9:29am

Cowardlyduck wrote:
Aug 25 2019 5:56am
Hey guy's,

I've done some playing around with size options to make a cost effective, high capacity Bomber battery with the latest tech and managed to come up with this:
Bomber 21700 Battery.JPG
There would be 2 levels, so it is 20S10P and uses 21700 cells.

What I don't know is if the 370mm length will be able to fit. It's only 20mm more than the max recommended length so I'm thinking it should be easy enough to fit by angling it in.

If this config could fit it would be approx 50AH, 20S (74V) so matches the existing battery setup for voltage and more than doubles the range. This would mean you could keep using the existing charger.

The only catch is it may be difficult to fit a BMS and it may be necessary to make the BMS a separate connectable unit that sits up in the neck area or on top of the pack under the seat sub frame. Once connected this would not be a problem in every day use and something like Velcro to secure it in place inside the frame could be used.

Anyway, let me know what you think. Does anyone feel like trying to fit it with some cardboard. The full dimensions would be around 375x145x120 (LxHxW)
If it can I think it might be a real game changer for Bomber owners.

Cheers
As Requested CD....
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Crossy   1 mW

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Re: E-S Stealth Electric Bike Owners

Post by Crossy » Aug 26 2019 9:30am

CD.... Sorry yes it fits

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Re: E-S Stealth Electric Bike Owners

Post by Crossy » Aug 26 2019 9:36am

Here is a photo of my bikes ... Finally after working out resolution of photos.
B52.jpg
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H52.jpg
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Theodore Voltaire   1 MW

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Re: E-S Stealth Electric Bike Owners

Post by Theodore Voltaire » Aug 26 2019 11:10am

Crossy wrote:
Aug 26 2019 9:36am
. Finally after working out resolution of photos.
B52.jpg


I have B412 that I received from Stealth in late 2013. It was just like yours as best as I can tell.

Theodore Voltaire   1 MW

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Re: E-S Stealth Electric Bike Owners

Post by Theodore Voltaire » Aug 26 2019 10:05pm

I just got through installing new Fox 40 Performance Elite forks. So far I went around the block a couple of times, and also a 20 mile test ride, and just got back. Sorry about the poor quality pictures, I'll get better ones eventually.

What I found out from this install is these forks aren't really suited for Bombers. Apprently these forks aren't supposed to work on a bike with a overall neck height, including races of more than about 5 3/4". Mine is more than 6 ". I didn't do accurate measurements on this issue, but the bottom line is our head tube, and bearing stack height is more than about 3/4" too long. The problem this causes is if you bottom out, the seals will hit the bottom of the crown. Raising the upper leg higher in the trees to make the upper leg long enough to reach a little above the top bracket only makes matters worse, because now there's even less travel available before the seals hit. That ended up being about 7 1/2", but the forks have 8" travel. So you better not buy these forks unless we can figure out how to fix this problem.

I probably should heed my own advise, but what's the worse that can happen? So the seals get crushed. I could still make it home. The tire is too short to hit the crown even if the forks are collapsed all the way. The level of danger is less than jumping a can of burning gasoline on my beach cruiser when I was 10 years old

Lets do this! First thing I noticed going around the block was a firm ride, with very little sag even in spite of my lard butt. I started out with the fork legs flush with the top of the top clamp, and even so the seals will hit by about a 1/2", but will they. Not like this, I'm barely using any travel. I have no idea how to adjust fancy forks like these, but I'm used to adding air to the forks on my Fatty, so I decided to check the pressure. Max is supposed to be about 120 psi, and that's about where they were. I dropped them down to about 100 psi, and got about 1/2" more sag, putting in the acceptable range of sag with me on the bike. I wound around the block again. It's still firm, but not riding quite as high. Didn't seem like it was in any danger of bottoming, I could only make it use a little more than half the travel. That being the case I decided to drop the forks about an inch in the trees. The legs are sticking up above the top clamp about 22 mm now. Satisfied it was working pretty good I took off for what turned out to be a 20 mile test ride at speed.

I before getting very far I found a short staircase that I rode down to see if it wanted to bottom. It didn't but it came within 20mm. After that I headed into the city looking for some bumpy streets. Going fast these forks are a dream. They feel firm, but they eat the forces up, hardly moving my hangs. Harder hits only feel like a dull thud to my hand. Bumpy streets that my stock forks hated, these forks seem to like better than smooth streets. My stock forks were also very noisy on rough pavement, but these forks are mostly silent. Leaned into a turn at speed I'm feeling great feedback from the tire. I have no doubt it's stuck to the road a lot better now. Riding through a turn at speed the extra stability is confidence inspiring. These forks are nothing like the stock forks.

Image

Image

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Cowardlyduck   100 MW

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Re: E-S Stealth Electric Bike Owners

Post by Cowardlyduck » Aug 27 2019 3:00am

Crossy wrote:
Aug 26 2019 9:30am
CD.... Sorry yes it fits
Thanks heaps Crossy! :thumb:
That's awesome! Exactly the visualisation I needed.
The 21700 pack is exactly those dimensions so I don't think it would fit once padding, wires, etc is factored in.

That means the slightly smaller 20S14P 18650 pack probably would fit nicely in one unit though. No need to split it up. :)

And since the 18650 pack is also the higher capacity, better balanced option I think it's the design I will settle on for anyone wanting a new Bomber battery with maximum capacity.

If anyone wants me to make them one, let me know. I can probably make them cheaper if I get a few orders around the same time as I can bulk order cells at a more discounted rate.

Cheers
Custom made 18650/21700 battery packs

Modified Stealth Fighter - Force air cooled motor @ 6KW, Adaptto Mini-E. 49AH, 52V 18650 - 2.5Kwhr
Cowardlyducks - Stealth Fighter Videos

BikeE recumbent commuter - 9C, 6Fet Grinfineon, internal 17AH, 52V, + on-board solar.

Ebike Garage - My YouTube Ebike ramblings.

High Power LiPo wiring harnesses - 4P - XT90, HXT4mm, 5.5mm. 200Amp+ capable. Global shipping.

Crossy   1 mW

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Re: E-S Stealth Electric Bike Owners

Post by Crossy » Aug 27 2019 7:04am

Cowardlyduck wrote:
Aug 27 2019 3:00am
Crossy wrote:
Aug 26 2019 9:30am
CD.... Sorry yes it fits
Thanks heaps Crossy! :thumb:
That's awesome! Exactly the visualisation I needed.
The 21700 pack is exactly those dimensions so I don't think it would fit once padding, wires, etc is factored in.

That means the slightly smaller 20S14P 18650 pack probably would fit nicely in one unit though. No need to split it up. :)

And since the 18650 pack is also the higher capacity, better balanced option I think it's the design I will settle on for anyone wanting a new Bomber battery with maximum capacity.

If anyone wants me to make them one, let me know. I can probably make them cheaper if I get a few orders around the same time as I can bulk order cells at a more discounted rate.

Cheers
CD the padding , wires etc were still stock and in closed in the cavity while the mock up was placed inside.
:bigthumb:

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Cowardlyduck   100 MW

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Re: E-S Stealth Electric Bike Owners

Post by Cowardlyduck » Aug 27 2019 7:28am

Crossy wrote:
Aug 27 2019 7:04am
CD the padding , wires etc were still stock and in closed in the cavity while the mock up was placed inside.
:bigthumb:
Yeah, it's the wires under the shell of the battery I'm talking about. The balance wires are pretty low profile, so 2-3mm, but the main discharge are usually at least 10awg and coming off a thick mass of copper or nickel so usually protrude 5-10mm beyond the end of the pack. Then the pack needs padding as well.

Cheers
Custom made 18650/21700 battery packs

Modified Stealth Fighter - Force air cooled motor @ 6KW, Adaptto Mini-E. 49AH, 52V 18650 - 2.5Kwhr
Cowardlyducks - Stealth Fighter Videos

BikeE recumbent commuter - 9C, 6Fet Grinfineon, internal 17AH, 52V, + on-board solar.

Ebike Garage - My YouTube Ebike ramblings.

High Power LiPo wiring harnesses - 4P - XT90, HXT4mm, 5.5mm. 200Amp+ capable. Global shipping.

Theodore Voltaire   1 MW

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Re: E-S Stealth Electric Bike Owners

Post by Theodore Voltaire » Aug 27 2019 9:57am

I don't like not having a front fender on my bike, and these fox forks are going to present a challenge to installing one. I'm waiting on a genius idea to pop into my head.

toad78   1 µW

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Re: E-S Stealth Electric Bike Owners

Post by toad78 » Aug 27 2019 12:05pm

Theodore Voltaire wrote:
Aug 19 2019 1:45pm
toad78 wrote:
Aug 19 2019 11:37am
Hi Guy's,
Just purchased a second hand mk1 Bomber i believe, this came with no battery. Can anyone advise on what spec of battery i should be aiming for?
72v with 80 amp bms, with 200 amp burst. Stock was 18ah, but I recommend at least 24ah or more.
Thanks for the reply, a battery builder has given me these options:

72V 36Ah battery - 20s12p, (suitable for 100A continuous discharge current and 200A peak) with BMS 100A and 200A peak discharge current based on Samsung 30Q cells

72V 42 Ah battery - 20s12, (suitable for 110A continuous discharge current and 230A peak) with BMS 150A and 300A peak discharge current based on Samsung 35E cells

Any thought would be appreciated.

Theodore Voltaire   1 MW

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Re: E-S Stealth Electric Bike Owners

Post by Theodore Voltaire » Aug 27 2019 3:42pm

toad78 wrote:
Aug 27 2019 12:05pm
Theodore Voltaire wrote:
Aug 19 2019 1:45pm
toad78 wrote:
Aug 19 2019 11:37am
Hi Guy's,
Just purchased a second hand mk1 Bomber i believe, this came with no battery. Can anyone advise on what spec of battery i should be aiming for?
72v with 80 amp bms, with 200 amp burst. Stock was 18ah, but I recommend at least 24ah or more.
Thanks for the reply, a battery builder has given me these options:

72V 36Ah battery - 20s12p, (suitable for 100A continuous discharge current and 200A peak) with BMS 100A and 200A peak discharge current based on Samsung 30Q cells

72V 42 Ah battery - 20s12, (suitable for 110A continuous discharge current and 230A peak) with BMS 150A and 300A peak discharge current based on Samsung 35E cells

Any thought would be appreciated.
What kind of cells?

toad78   1 µW

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Re: E-S Stealth Electric Bike Owners

Post by toad78 » Aug 27 2019 4:14pm

Theodore Voltaire wrote:
Aug 27 2019 3:42pm
toad78 wrote:
Aug 27 2019 12:05pm
Theodore Voltaire wrote:
Aug 19 2019 1:45pm
toad78 wrote:
Aug 19 2019 11:37am
Hi Guy's,
Just purchased a second hand mk1 Bomber i believe, this came with no battery. Can anyone advise on what spec of battery i should be aiming for?
72v with 80 amp bms, with 200 amp burst. Stock was 18ah, but I recommend at least 24ah or more.
Thanks for the reply, a battery builder has given me these options:

72V 36Ah battery - 20s12p, (suitable for 100A continuous discharge current and 200A peak) with BMS 100A and 200A peak discharge current based on Samsung 30Q cells

72V 42 Ah battery - 20s12, (suitable for 110A continuous discharge current and 230A peak) with BMS 150A and 300A peak discharge current based on Samsung 35E cells

Any thought would be appreciated.
What kind of cells?
Samsung 30Q 3000mAh/15A For 36AH

Samsung 35E 18650 3500mAh 8A For 42AH

Theodore Voltaire   1 MW

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Re: E-S Stealth Electric Bike Owners

Post by Theodore Voltaire » Aug 27 2019 10:10pm

toad78 wrote:
Aug 27 2019 4:14pm

What kind of cells?
Samsung 30Q 3000mAh/15A For 36AH

Samsung 35E 18650 3500mAh 8A For 42AH
[/quote]

That's what I have, 30Q. Mine is 24ah 7p. I love it except I wish it was about 30ah.

1abv   1 kW

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Re: E-S Stealth Electric Bike Owners

Post by 1abv » Aug 28 2019 3:13pm

KarlJ wrote:
Aug 23 2019 9:45pm
Hi Guys
Last bike was a 29ER with a MAC motor and around 2000W, sold post divorce and pre move back to Melb.

So I just picked up a 2013 B52 Bomber with 2500kms on it, done 100kms on it over the last couple of days.

I assume the 2 pot brakes are Magura MT2, pads not available from your regular bike shops as i discovered doing the rounds of my local 6 places! Pads are OK but last bike went through pads every month or so with a daily 30km commute.

I have read about 200 of the 660 pages and I'm thinking I should be looking for a fighter instead.

So.... If anyone has a fighter and wants a bomber....in Melb hit me up

Are these the ticket for a brake upgrade and does the crystalyte controller run NO or NC for the ebrake cutoff?

https://www.ebay.com.au/itm/Magura-MT5e ... 0005.m1851
Karl,
I went from the Magura mt5 to the Shimano Saints and it is night and day difference. I could never get the Magura lever feel the way I wanted them. They always felt soft and just barely powerful enough to stop the bike even with upgraded pads. I went through about 3 sets of pads ina year and a set of rotors. The Saints are proper downhill brakes (used in competition) and combined with the ICE rotors they comfortably and safely stop the bike on a dime. In extreme conditions (high speed, off road and downhill) they are simply in a different league then the Maguras. Personally I never trusted the Maguras and felt like they were on the edge but the Saints are the business.... In the 3 years that I've had them on the bike I just replaced the front pads once. The rears are still on the first set. Hope this helps..

Alex....

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Re: E-S Stealth Electric Bike Owners

Post by KarlJ » Aug 28 2019 5:48pm

[/quote]
Karl,
I went from the Magura mt5 to the Shimano Saints and it is night and day difference. I could never get the Magura lever feel the way I wanted them. They always felt soft and just barely powerful enough to stop the bike even with upgraded pads. I went through about 3 sets of pads ina year and a set of rotors. The Saints are proper downhill brakes (used in competition) and combined with the ICE rotors they comfortably and safely stop the bike on a dime. In extreme conditions (high speed, off road and downhill) they are simply in a different league then the Maguras. Personally I never trusted the Maguras and felt like they were on the edge but the Saints are the business.... In the 3 years that I've had them on the bike I just replaced the front pads once. The rears are still on the first set. Hope this helps..

Alex....
[/quote]
MANY Thanks - MT2's going to stay until I have got the bike on the road now, battery exercise is going to hurt the bank balance alot.
will do the saints when funds permit!

KarlJ   100 W

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Re: E-S Stealth Electric Bike Owners

Post by KarlJ » Aug 28 2019 5:49pm

Theodore Voltaire wrote:
Aug 27 2019 10:10pm
toad78 wrote:
Aug 27 2019 4:14pm

What kind of cells?
Samsung 30Q 3000mAh/15A For 36AH
Samsung 35E 18650 3500mAh 8A For 42AH
That's what I have, 30Q. Mine is 24ah 7p. I love it except I wish it was about 30ah.
[/quote]

https://www.ebay.com.au/itm/72V28-42AH- ... ctupt=true

is beginning to look pretty tough to beat.

Theodore Voltaire   1 MW

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Re: E-S Stealth Electric Bike Owners

Post by Theodore Voltaire » Aug 28 2019 8:30pm

Thanks for fixing that Karl

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Cowardlyduck   100 MW

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Re: E-S Stealth Electric Bike Owners

Post by Cowardlyduck » Aug 28 2019 9:48pm

KarlJ wrote:
Aug 28 2019 5:49pm

https://www.ebay.com.au/itm/72V28-42AH- ... ctupt=true

is beginning to look pretty tough to beat.
I can't / won't compete with that. See how you go... It can be hit and miss.
Custom made 18650/21700 battery packs

Modified Stealth Fighter - Force air cooled motor @ 6KW, Adaptto Mini-E. 49AH, 52V 18650 - 2.5Kwhr
Cowardlyducks - Stealth Fighter Videos

BikeE recumbent commuter - 9C, 6Fet Grinfineon, internal 17AH, 52V, + on-board solar.

Ebike Garage - My YouTube Ebike ramblings.

High Power LiPo wiring harnesses - 4P - XT90, HXT4mm, 5.5mm. 200Amp+ capable. Global shipping.

Theodore Voltaire   1 MW

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Re: E-S Stealth Electric Bike Owners

Post by Theodore Voltaire » Aug 28 2019 10:19pm

Check out these baby's. I love them, and they love me. I never had fancy forks like these before.

Image

Image

Image

Theodore Voltaire   1 MW

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Re: E-S Stealth Electric Bike Owners

Post by Theodore Voltaire » Aug 28 2019 10:26pm

Don't worry, I'm going to remove the stickers.

Theodore Voltaire   1 MW

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Re: E-S Stealth Electric Bike Owners

Post by Theodore Voltaire » Aug 28 2019 10:42pm

I may have to increase the power of my cloaking devise.

Crossy   1 mW

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Re: E-S Stealth Electric Bike Owners

Post by Crossy » Aug 29 2019 4:48am

Theodore Voltaire wrote:
Aug 28 2019 10:42pm
I may have to increase the power of my cloaking devise.
Or you could get a yellow raincoat and and flashing red light and siren and elude that you are a fireman conducting a research program on alternate forms of transportation to emergencies. 8)

KarlJ   100 W

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Re: E-S Stealth Electric Bike Owners

Post by KarlJ » Aug 29 2019 5:56am

where you getting those tyres, how much and how long they last?

My wheels are 24" right?

mine looking knobby and unlikely i'll be going off road anytime soon.....Karl

Theodore Voltaire   1 MW

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Re: E-S Stealth Electric Bike Owners

Post by Theodore Voltaire » Aug 29 2019 9:48am

KarlJ wrote:
Aug 29 2019 5:56am
where you getting those tyres, how much and how long they last?

My wheels are 24" right?

mine looking knobby and unlikely i'll be going off road anytime soon.....Karl
Karl, my tires are 24 x 2.5 Maxxis Hook Worms, the best bicycle street tires ever made. I get about a 1000 miles on a rear. They'll fit on stock rims. Compared to Crazy Bob's they're longer lasting, have better grip, are slightly bigger, and have a taller profile.

They look, and work a lot better on my 65mm rims though, but you could probably say the same thing about any tire.

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