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Old 03-07-08, 12:06 PM   #1
Linus_S
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Mid Drive Electric Recumbent

Here is an example of a mid drive electric recumbent. The motor drives the rear chain. I have full use of all 21 speeds (The rear wheel houses a 3 speed hub and a 7 speed sprocket set). I have low speed torque for hills and top end speed as well in high gears. The front chain is on a flywheel. I can pedal and use the electric motor in any combination. The motor is controlled by a throttle that I mounted on the left handlebar. I mounted on the left so I can switch though the 7 gears on the right side. It forces me to let go of the throttle if I switch the hub (hi med low). I did this because switching the hub under load is not a good thing. I ease off on the motor almost entirely when I shift gears on the right side so there is less strain on everything.

I have a 1000 watt motor with a 42 volt 22 amp hour battery. I am using a Cycle Analyst to measure consumption. Also I use a GPS as a speedometer and map.

My trial runs recorded a top speed was 61 km/h before I eased off of the motor. I would not do that again because it lowers my range, and it is not safe. The fairing can wobble at high speeds if a heavy truck passes by. I keep my speeds lower for this reason. If I want to ride this fast I will surround myself with 1000 kg of metal (car).

The motor and battery are a kit from ecospeed.net

I have removed the storage bags to provide a better view in this photo. Usually I carry tools, tubes, and my laptop. I also have a small bag to carry the charger.

The fairing adds range because it reduces wind resistance. I used to top out at 50 km/h because of wind resistance on a steep hill. With the fairing on the same hill, I have to break when I get above 60 km/h otherwise my speed keeps increasing. I also have the benefit of not getting as wet in the rain because of the fairing.

I RECOMMEND with any ebike serious consideration of ALWAYS WEARING A HELMET!
Goggles are important too at higher speeds for me because of road debris.
Get used to preflight check listing too. I use aircraft mentality when getting ready for a ride. Check the brakes, tyre pressure, spokes, frame, charge level, lubrication, and wiring.
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Last edited by Linus_S; 03-07-08 at 01:17 PM.
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Old 03-08-08, 09:01 PM   #2
cerewa
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I suppose with a vehicle that has a lot of parts that aren't thoroughly proven (individually and working together) it's not such a bad idea to be really careful about them.

I'm a lot less careful than you are with the "pre-flight check" and whatnot. My bike's top speed is no higher than it was before I added a motor (it's just a lot faster on uphills) and the electric stuff doesn't affect the steering or braking, so I have continued to just hop on and go as I did before adding a motor to my bike. I still agree with your suggestion to wear a helmet anyway.

Your bike is really cool. I like that you went for a 1000W motor and an aerodynamic bike. Looks like a serious piece of transportation equipment.
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Old 03-08-08, 09:34 PM   #3
Allen
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Very nice bike. Thanks for the lead to ecospeed,
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Old 03-14-08, 05:21 PM   #4
15rms
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Nice bike Linus. Was it very hard to install the Eco Speed? I was wonering about the alignment. Does your chain come off a lot? How much faster do you think your 1000 watt is over their 600 watt? Thanks
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Old 03-15-08, 01:58 PM   #5
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Ecospeed questions

The installation was pretty easy for me. I am pretty good with this type of thing. The hardest part was putting the mounting brackets inside of the frame for the motor mount. I used a meter stick to do that.

Alignment is fine. I have yet to have a chain pop off on me. I am not sure how much faster the 1000 w motor is over the 600 w motor. I can tell you that I have incredible torque and top end speed.

This week I commuted home from one of our offices in the area in a nasty wind and rain storm. I did a 38 km ride, and consumed about 15 AH. I was carrying a lot of weight and riding hard into the wind. I had a average speed of 35 km/h. In the end I had to climb a steep hill. Having a big battery and a powerful motor made all the difference in the world.
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