Miles' Project 1 [eMoulton]

[recumpence]

It's designed for hill climbing, top speed is 22mph at this voltage (39V). It pulled up a long 20% gradient with ease. Consumption 12 Wh/mile, so far. Will get some proper data later in the week.

Have you rigged up the eLogger to yours yet, Matt?

Yes. It works fantastic!

Wow, 12wh per mile............ amazing! My best was 15.69 (if I really nursed it) without any pedalling. I average about 20wh per mile. However, mine is geared for 40mph and has HUGE horsepower.

Still, 12wh per mile is incredible.

Matt

 

[jmygann]

Was the 12wh/mile without pedaling ?

 

[Miles]

With minimal pedalling. I'll do some more rigorous testing later in the week.

 

[knoxie]

Hi Miles

Still loving your work, I am disappointed that Draper still wont recognise what a good job you have made of the bike though, I dont post on PA but did see him still saying that he thought his bike was better and more efficient etc etc, that annoys the heck out of me, how can he think his heavy and inefficient upright cheapo bike is better than your bike is beyond me? he was claiming his chain reduction is more efficient than the belt? he didnt count on the fact that your bike has 1/4 of the weight and the rolling resistance of his bike?

Ah well, anyone with eyes will know your bike is prob the best looking and cleanest most elegant build that we have all seen to date, Randys concept is a good one its just a shame that he cant acknowledge someone has taken it to the next level, i would take belt drive over chain drive any day, I know this from experience of playing with chain and belts on the Lemco bike.

Would love to see and hear your bike in action Miles if you can make that happen? I think one of those coconuts may have fell and hit Randolph on the head :lol:

Cheers

Knoxie

 

[recumpence]

I won't even say what a really think about Randy. He is the reason I stopped posting on the PA forum.

I cannot believe the crap he gave me on my bike. He actually posted this regarding my bike------- "You may as well just stick a drum sander in a drill and run it against the front tire for the efficiency you will get with your setup........"

He is a worthless...............

Well, anyway, he is stuck in a state that has banned E-bikes. Serves him right.

Miles bike is the most elegent setup I have seen. From my perspective, I do not think it is possible to achieve better efficiency than he has right now with existing technology (without some radical custom stuff).

The best efficiency I have seen is 15wh per mile without any hills (no pedalling) at 20mph or the same 15wh per mile with gentle pedalling but using the motor up hills. Typically more like 20wh per mile just cruising, not paying attention to efficiency.

12wh per mile is absolutely phenominal.

I am very excited to see and hear his bike.

We need some video! :wink:

Matt

 

[Miles]

Hi knoxie,

You're too kind...

Randy's reaction was pretty much what I expected... Actually, I'd like to do some tests to compare the efficiencies of belts and chains at the torque levels/speeds that we are using them. It would be good to have some figures.

Speaking of your LEMCO bike, I was looking at the pic of its gearbox today:

That was a beautiful bit of engineering

I'm planning to do a video of the Moulton, so you'll be able to see it in action - but you won't hear it... :wink:

We should really make a date for all of us to meet up, while the weather's still fine.

 

[recumpence]

I wish I was near you. I would love to see your bike in person.

I love the Lemco drive system too. Very slick.

Matt

 

[Miles]

Just been out for an evening ride:

Over mixed terrain, for speeds under 18mph (with no pedalling at all), I was getting 15.7 Wh per mile.

38.4V 4.6 Ah NiMH pack gave 4.3 Ah (2nd discharge).

More data over the weekend.

 

[recumpence]

How much heat was in the motor?

Matt

 

[Miles]

It didn't really heat up much - just felt slightly warm, at the end of the run. It weighs 5.5 pounds, is vented and has a small fan on the shaft. When I put the eLogger on, I'll add a temperature sensor.

 

[recumpence]

Man, very cool (pun intended). :wink:

I want a video, I want a video!

Matt

 

[Miles]

No load data

For WOT (43V)

Motor only:
0.72 A

Drive system:
Low belt tension, direct drive.......0.98A
Low belt tension, top gear...........1.01A
Nominal belt tension, direct drive..1.11A
Nominal belt tension, top gear......1.13A
.

 

[Miles]

D-calc plot using measured data

 

[recumpence]

Miles,

Any progress? I am having technology withdrawls. :wink:

Man, I was looking at your no load data. Looks fantastic! But, you should be seeing better than 15wh per mile with that kind of no load data. According to my data logger, I am pulling clost to 8 amps (high belt tension) at 44mph WOT with the rear wheel off the ground. Of course, with less belt tension and staying at 20mph, that number is roughly 2 amps.

Anyway, I am looking forward to more pics and info on your bike.

Matt

 

[Miles]

Hi Matt,

To be honest, I still haven't got around to doing any rigorous testing with the eLogger. I've been distracted by the planning for projects 2, 3 and 4...

I really should collect some more accurate data before the weather turns.

How's it going with your belt-drive kit idea?

 

[recumpence]

I am just about ready to start machining the box.

So, projects 2,3, and 4. Don't you mean 002, 003, and 004? :wink:

Matt

 

[Miles]

So, projects 2,3, and 4. Don't you mean 002, 003, and 004? :wink:

I love the initial development stages of a project the best, I think - starting with a blank sheet

 

[dennis]

I'm curious, do you have a picture of your backpack battery to share? I am currently working on a backpack battery for my Bionx kitted Mu SL.

 

[Miles]

Hi dennis,

The batteries are just loose in a laptop backpack, with a coiled lead to the bike. I haven't given much attention to this area, yet....

 

[dennis]

Thanks for the Pic. Nice sleek covert power unit.
On some of my extended test rides, I found too many Ah's is never enough and 18 AH's of juice is gone in the blink of a eye. Plus, it's a real pain swaping the Bionx stock batteries carried in my backpack. With my new after market battery pack, I plan to carry up to 40 Ah's of LiFEPO4 at 36V in parrallel in a heavy duty backpack. Pic:

 

[Miles]

Hi Martin,

It comes as a kit, with the cranks. I got mine from Strida Netherlands, who have now taken over the whole of the European distribution network.

http://www.strida.nl/vouwfiets_contact/

Maximum diameter is 263mm

 

[Miles]

The Strida pulley is 100t. How about the CDrive, which you can get in 80t and 60t?

 

[Miles]

http://www.torquetrans.com/pulleys/custom-pulleys/gt-2-pulleys.htm

 

[Robbie Hatfield]

The only drawback if you can call it one that I see is it looks like getting the wheel off of the back in order to fix a flat tire might be troublesome?

Robbie

 

[Miles]

Hi Robbie,

In practice, it's not much more trouble than dealing with a normal derailleur set-up. Detach the "Click-box", loosen the axle nuts and push the wheel forward, then slip the belt off the motor pulley and it drops down and hangs out of the way below the large pulley, leaving you free to remove the wheel as you otherwise would.