amiDesign

Trike I

2007 - Recumbent trike

Idea for the trike.

The two complete wheels weight is 10.5 lb.

Wheels are BMX 20" rims and wheel chair hubs with drum brakes.

This is the best image of my trike.

Nenad riding my trike.

Front axle geometry :

The front axle is built in an inclined plane. It will be welded onto a board used as marble. Figure of the right wheel. Direction of travel along axis x

The contact point of the wheel is in F

The axis of the wheel passes by B and D

The distance E0 = half track

BC = AG

BF = A0

Caster theta = arctan (AB / A0)

Camber beta = arctan (BC / A0)

Length B0 = (AB² + A0²)^(1/2)

Gamma = arctan (BC / B0)

Numerical application :

Wheels are 20 inches which makes 254 mm radius

I choose a tire crushing of 4 mm

So BF = 250 mm = A0

I also needed AB = BC = 50 mm

Caster theta = arctan (50 / 250) = 11.31 �

Camber beta = arctan (50 / 250) = 11.31 �

Length B0 = (50² + 250²)^(1/2) = 255 mm

Gamma = arctan (50 / 255) = 11.1 �

To draw this angle on the board I use lengths 50 and 255

2009 Technical drawings

Trike three views schematics

Trike wheels and headset plan

Trike front axle plan

Trike kingpins plan

Trike frame plan

Trike handlebars plan

Trike seat plan

Trike detailed construction pictures

Technical data

Designation : ami-trike-I.

First crank : 53T

Second crank : 39T

First gear : 13T

Last gear : 32T

Track : 27.2inch

Width : 30.7inch

Wheelbase : 37.4inch

Length : 68.1inch

Seat height : 6.3inch

Crank height : 11inch

Vehicle weight : 41lb

Maximal pilot weight : 175lb

Rolling drag coefficient m' : 0.006

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Wheel fairing

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