Oct 22

First round concepts – ‘blue sky’

The TriBike

These are basic and quick sketches to convey the idea of a concept. In reality the wheels will actually be round!

First round sketches 013

One fore 2 aft 3 person bike

One fore 2 aft 3 person bike

This is a one in front 2 behind configuration with the front rider being in a conventional bicycle riding position with the 2 rear riders being in a recumbent riding position side by side. This would have 3 wheels, and a load bearing beam frame between front and rear contact patches.

Long frame side by side

Long frame side by side

Based around a tandem concept, this would include a long tandem style frame for the primary bike with a pair of single wheeled longseat recumbent style bikes on either side of the primary. This could either be three or four wheeled (three wheels in the rear axle line)

The side car concept

The side car concept

This concept is a shorter wheelbase than the last one. This would have a pair of side cars with a single wheel that is not driven. The power from the rider of the side car would be transmitted to the primary bike drive train. This bike would have a single driven wheel at the back of the primary bike. The primary would have an extended frame to increase the wheelbase to accommodate the length of the side cars.

The articulated 1 fore 2 aft trike.

The articulated 1 fore 2 aft trike.

This is a side by side recumbent style bike hitched to the back of a road bike modified to have a structural hitch on the back. This configuration would be extremely long but would have the advantage of being narrower than the previous concepts. This design would also have the advantage the the lead bike could be ridden independently when not hitched to the recumbent rear.

3 person side by side recumbent style bike

3 person side by side recumbent style bike

3 person side by side delta style recumbent trike. In this configuration all three people are sat side are in a recumbent position. This trike would have the advantage of a relatively short wheel base and high maneuverability but would also be very wide.

One aft 2 fore 3 person bike concept

One aft 2 fore 3 person bike concept

1 rear driven wheel and 2 front steering wheels with one person on a conventional style bicycle on the rear with 2 people on recumbent style bicycles on the front.

Front wheel drive rear wheel steering configuration

Front wheel drive rear wheel steering configuration

This has a front rider with conventional bike geometry, but with a front driven wheel. The two people on the rear of the bike are side by side and they also drive the front wheel. The rear wheel is the steering wheel. The advantage of this system is a very simple and light weight drive train. The disadvantage comes with the challenge of rear wheel steering geometry.

The Running Cart

All of the concepts for the running cart are single speed with a target bike gear ratio of 9 minutes per mile.

The running cart

The running cart

This configuration has a single driven front wheel and a pair of large pneumatic casters at the rear. The handlebars are attached at the rear.

This configuration could equally well have a single caster in the rear and a pair of non steering front wheels that are driven.

Rear wheel drive running cart

Rear wheel drive running cart

In this configuration the running cart is rear wheel drive. There are 2 front caster wheels. This clearly will have a lot of chain getting from the cranks to the rear wheel.

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