LockH
1 PW
Hehe.... from the OP in this thread... "self-engineered project".... when "the world" of bike makers are "going electric". Suspect only that a "self-engineered project" is a "pipe dream" for the vast/most. :wink:
Hillhater said:Have you weighed it yet ?
Tommm said:SwampDonkey said:Sweet bike! Where did you get the 4kw kit? Ive seen the standalone motor but not kits offered.
I think there are kits available now, just no one really knows about it.
SwampDonkey said:Tommm said:SwampDonkey said:Sweet bike! Where did you get the 4kw kit? Ive seen the standalone motor but not kits offered.
I think there are kits available now, just no one really knows about it.
Well yeah, but where are they?
How much battery is in that ?tubeglower said:Hillhater said:Have you weighed it yet ?
31kg
Hillhater said:How much battery is in that ?tubeglower said:Hillhater said:Have you weighed it yet ?
31kg
fechter said:Great welding skills. I wish I could do that nice.
Where did you get those temp gauges? Those look really nice.
How are you planning to finish the aluminum?
DingusMcGee said:Tubeglower,
Does the 31 kg include the weight of the battery pack you say you will use?
It wont help with your estimates, but this may give you some encouragement..tubeglower said:....pack made out 3 of these: https://hobbyking.com/en_us/multistar-high-capacity-6s-10000mah-multi-rotor-lipo-pack.html
it is 3 x 6S = 18S Lipo, 10000mAh. Need to check how much range it gives with "moderate" use (PAS) in offroad (actual MTB use), which it is the main expected use. Under "moto" mood I don't expect too much range, maybe 15km?
Hillhater said:It wont help with your estimates, but this may give you some encouragement..tubeglower said:....pack made out 3 of these: https://hobbyking.com/en_us/multistar-high-capacity-6s-10000mah-multi-rotor-lipo-pack.html
it is 3 x 6S = 18S Lipo, 10000mAh. Need to check how much range it gives with "moderate" use (PAS) in offroad (actual MTB use), which it is the main expected use. Under "moto" mood I don't expect too much range, maybe 15km?
I run a 48v, 12s pack (3x4s) of the 16Ah Multistars. On a 750w TSDZ2 drive.
In the past week or two i have ridden a total of 5 + hrs of rough hilly forrest trails without recharging until yesterday. (46.5v on the pack)
Even then it only took 6Ah of charge to bring the pack back up to 49.5 v.
(And 750W mid drive climbs trails i find difficult walk up)
tubeglower said:this thing is crazy, I managed to reach 70 km/h in my parking entrance (it is a condominium parking corridor), and I doubt that is the max speed yet...
DingusMcGee said:Tubeglower,
70 km for top speed is slightly lower than what I would expect with the 4kw motor and a low profile person as I have gotten 42 mph on an "S" works hardtail Specialized with the 3kw motor.
I have an early model Specialized Big Hit set up as an edirtbike. The unmodified frame bike setup weights in at 35kg with batteries (3 -6S 12,000mAhr Multicraft). Some items adding weight to my setup over yours may be a 2.75" front & 3" rear knobby tire with heavy tubes, 12 oz of Green Slime in each tube, heavy duty chains, steel sprockets and double stanchion fork with steel direct mount tiller extension. Obviously the KTM seat used on mine adds more than a standard bike seat.
From pictures of your frame it looks like the dominate distant lower bb hinge pin for the rear suspension will result in greater chain tightening upon rear compression than the double 4-bar Hourst linkage used on Specialized rear suspension. As I am running a dedicated one speed, chain slack is more of a problem than with a long derailleur. Dereailleurs get torn off on really difficult, tight and bushy terrain. The bike at low amps 30, can continuously climb a 67% grade which is natural talus angle.
And I must say you've got an interesting modification. Aside from making an enclosed battery back, did this conversion to a shell-box reduce frame weight much?
The wheelbase on mine is 45.5". And your wheelbase dimension?
IMG_6993.JPG
So far no problems with my simple battery pack from crashes. You do get maximum traction while riding on the rear tire only.
Tommm said:Can you upload a pic of the finished bike?
tubeglower said:an extra picture in its natural environment
icherouveim said:tubeglower said:an extra picture in its natural environment
Nice build! Are you going to paint it also when you finish with the settings and tyres?