thunderstorm80
1 kW
- Joined
- Mar 29, 2016
- Messages
- 383
Hi,
This is a discussion, for the optimum electric propulsion for a heavy touring bike, assuming big grade slopes (positive and negative) along the way.
I wish not only to drive on roads (and cars), but also to cross countries by off road trails. (4x4 gravel roads at worst - not single tracks, drops, jumps...)
I did such a touring across Estonia by using Google Earth to locate forest roads. It was amazing. I didn't have a motor (it was just flat anyway), but some forest roads were quite bumpy to my back, hands, and to the equipment I was carrying. (I used a rigid touring bike)
First, I wonder if there exist a full suspension bicycles for touring:
Probably with shorter suspensions, but with geometry that allows standard front&rear racks to be used, so they located in the SPRUNG zone of the bike?
There are solutions to regular full suspension bikes, but those racks are attached to the unsprung parts - for example on the fork beneath the shock absorber.
I would also like to use 700c tires, and not small 20inch or so.
I was considering, however, the option of taking my full-suspension E-Bike that has two motors, and attach a trailer behind it for the equipment. This adds a significant drag, and it would be impossible to use it outside of well paved asphalt roads.
Now about electricity:
I see two optimum options:
1. Front DD motor and rear geared motor: The front works alone during flats where it's more efficient and low power is needed, and also regen during downhills. The geared joins at takeoffs (to pass as fast as possible the low efficient speed zones), and works continuously with the DD during uphills.
I have such configuration, and compared to just a single front DD - I save 40% of the energy during uphills.
The location is also optimum for each motor - More weight and traction is needed on the rear wheel during ascents, and more weight and traction is needed on the front during descents.
The downside is that only one motor is working during regen (and it's significant with touring weight), and the geared-motor wouldn't live long with the added equipment weight above while off-roading.
2. Two identical DD motors - For example two H3540's, which exists both as front and both as rear. This increases regen recovery compared to a single H3540 but it's less than two-fold power increase like on forward propulsion - in the order of 20-30% increase from the regen of a single DD. It does however let you regen more slowly, and powerfully, especially if you go down very steep roads with sharp turns - and add some rain to make the scene more interesting. As you slow down on a 2x2, you are much more weather resistant against slippery. It simplifies the use of a single throttle and CA, but still requires two controllers. (Phaserunners).
The downside is the much higher weight (15Kg for 2xH3540, compared with 10.5Kg for H3540+Ezee250), and a double cogging torque in case you have to pedal alone if there is a flat battery or other malfunction.
What is your opinion?
This is a discussion, for the optimum electric propulsion for a heavy touring bike, assuming big grade slopes (positive and negative) along the way.
I wish not only to drive on roads (and cars), but also to cross countries by off road trails. (4x4 gravel roads at worst - not single tracks, drops, jumps...)
I did such a touring across Estonia by using Google Earth to locate forest roads. It was amazing. I didn't have a motor (it was just flat anyway), but some forest roads were quite bumpy to my back, hands, and to the equipment I was carrying. (I used a rigid touring bike)
First, I wonder if there exist a full suspension bicycles for touring:
Probably with shorter suspensions, but with geometry that allows standard front&rear racks to be used, so they located in the SPRUNG zone of the bike?
There are solutions to regular full suspension bikes, but those racks are attached to the unsprung parts - for example on the fork beneath the shock absorber.
I would also like to use 700c tires, and not small 20inch or so.
I was considering, however, the option of taking my full-suspension E-Bike that has two motors, and attach a trailer behind it for the equipment. This adds a significant drag, and it would be impossible to use it outside of well paved asphalt roads.
Now about electricity:
I see two optimum options:
1. Front DD motor and rear geared motor: The front works alone during flats where it's more efficient and low power is needed, and also regen during downhills. The geared joins at takeoffs (to pass as fast as possible the low efficient speed zones), and works continuously with the DD during uphills.
I have such configuration, and compared to just a single front DD - I save 40% of the energy during uphills.
The location is also optimum for each motor - More weight and traction is needed on the rear wheel during ascents, and more weight and traction is needed on the front during descents.
The downside is that only one motor is working during regen (and it's significant with touring weight), and the geared-motor wouldn't live long with the added equipment weight above while off-roading.
2. Two identical DD motors - For example two H3540's, which exists both as front and both as rear. This increases regen recovery compared to a single H3540 but it's less than two-fold power increase like on forward propulsion - in the order of 20-30% increase from the regen of a single DD. It does however let you regen more slowly, and powerfully, especially if you go down very steep roads with sharp turns - and add some rain to make the scene more interesting. As you slow down on a 2x2, you are much more weather resistant against slippery. It simplifies the use of a single throttle and CA, but still requires two controllers. (Phaserunners).
The downside is the much higher weight (15Kg for 2xH3540, compared with 10.5Kg for H3540+Ezee250), and a double cogging torque in case you have to pedal alone if there is a flat battery or other malfunction.
What is your opinion?