Share this project

Done

Share this project

Done
e-Bike Generator project video thumbnail
Replay with sound
Play with
sound
$111 pledged of $25,000 goal
backers
By Chris Wilson
$111 pledged of $25,000 goal
backers

About this project

This travel trailer recently completed a  two day cross country ride behind a battery powered bicycle and never once stopped to recharge. What more do you need to say? Back country tours without automotive transport or commuting fifty miles without range anxiety, these are but two of the reasons a small, lightweight, powerful generator such as ours is ideal. Power a campsite including your new battery powered ice chest and an electric guitar. Quiet enough for both.

The design's stability came after much work involving accelerometers, powered treadmills, trial and error and more than a few hours in the metal working shop. The hitch is laid out so that oscillations in one axis are canceled by the other. Very nice. The center of gravity lies below the line from the hitch attach point to the wheel contact point so it has inherent stability. In spite of this, and to further increase stability, the engineers at Robobike  built a Magnetic Mass damper based on the tuned mass dampers found in everything from automobiles to sky scrapers. Gyroscopic stabilization is in the works for carrying passengers above this aforementioned line of action.

The next design revision will see a trailer that folds into itself for carriage into the workplace or onto public transit. More sophisticated controls will be added and a hard shell fitted to give it that look associated with well made luggage. This is a nice piece of work and we hope you like it.

Description: The trailer is a mobile generating station sized to meet the requirements of an electric assist bicycle on tour. State laws generally limit the power of these bikes. Our generator will supply that much for cruising plus an extra margin that can be used to charge an auxiliary battery. Using only generator output, a 130 kg (286 lb.) bike and rider can maintain a 12 mph pace up a 7 per cent grade indefinitely. Since this is not the preferred method of use, the rider's contribution allows for a comfortable margin in the power profile.

Features: The single wheel design pulls easier than any other design due to reduced rolling resistance and easier tracking.

The high attachment point maintains stability as it creates a pendulous effect augmented by its Tuned Magnetic Damper.

Tuned Magnetic Damper smooths the perturbations and periodic oscillations found in other single wheel designs. Gyroscopic stabilization (optional) allows for carriage of loads above the line of action.

Anti-lock electric trailer brake with resistance wire load coils for descending mountain grades. This system has been in use for 80 years on diesel-electric locomotives.

The small, four cycle 25cc engine is quiet, reliable and easy to control. Flex fuel is optional though not currently available. The generator is capable of powering a large household refrigerator during a power outage. Another plus.

  The PM generator is maintenance free and has no brushes or slip rings. The multiple rotor design has no end windings making it more efficient than conventional automotive type alternators. The generator itself is the latest and smallest in a line of similar machines. It weighs approximately three pounds and is six inches in diameter.

Generator output is switch mode regulated between 24vdc to 60vdc. Select the best one for your application.

Two USB charging ports

One 125 volt AC outlet, pure sinusoidal. No inverter needed.

LiFePo4 auxiliary battery with plug in charger allows for quiet operations in sensitive areas.

The trailer has reserve load carrying capacity which allows for carriage of camping gear, personal items and tools.

Though it does not rise to the level of Potato Salad, our passively stabilized single wheel bike trailer with its micro-generating unit is something we take great pride in offering to the cycling world.

Risks and challenges

The risks are not many outside of ensuring the stability and fail safe attributes are met. Our experience with consumer products guarantee that will happen. An outside vendor will be needed to program the next generation processor but that is not difficult to manage. The timeline of 9 months allows for three months wiggle room beyond our scheduled six month resource management budget.

Learn about accountability on Kickstarter

Questions about this project? Check out the FAQ

Support this project

  1. Select this reward

    Pledge $10 or more About $10

    One year subscription to Just Say Bueno, the Robobike newsletter full of shop tips and other DIY stuff

    Less
    Estimated delivery
    2 backers
    $
    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  2. Select this reward

    Pledge $25 or more About $25

    Download working drawings and blueprints for a DIY no welding involved custom bicycle, aluminum square tube and suitable for beginners to experts.

    Less
    Estimated delivery
    0 backers
    $
    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.
  3. Select this reward

    Pledge $50 or more About $50

    How Much Does It Weigh?
    A delightful book describing shop techniques, material science and how to get started in building bikes at home. A 24.99 value.

    Less
    Estimated delivery
    Ships to Anywhere in the world
    1 backer
    $
    Kickstarter is not a store.

    It's a way to bring creative projects to life.

    Learn more about accountability.

Funding period

- (30 days)