All the (off)road going amphibious vehicles of the world. (work in progress) All the (off)road going amphibious vehicles of the world. (work in progress)

Last modified 16 Apr 2010

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Amphiroll (1960
VV This vehicle has 2 DAF 750 cc engines with 2 variomatic gearboxes.
This means that there is 1 engine and 1 gear box for each roll.

The vehicle screws it self forward or reverse by rotating the rolls in opposite direction

Amphirol 02 The real joke of this vehicle is that a variomatic gearbox gives the same speed forward and reverse.

So if you rotate both rolls in the same direction this vehicle moves at a frightening speed sideways.

By changing the parallel angle of the rolls, steering side ways works fine.
Amphirol 03 The only drawback on this vehicle is that it never will be street legal. :)

The B&W pictures came from the archives of The DAF Museum
Tongelsestraat 27
Eindhoven
Nederland


Steering mechanic Joris Bracke has written me:

The Amphirol was designed around 1960 by J.J. de Bakker (my granddad) owner of the machine factory de Bakker in Hulst (Holland)

He was looking for a solution to go fishing when he wanted.

He was a busy man and he did not want to wait for the right water level. He like to fish at "verdronken land van saeftinge", a Dutch town that was taken back by the sea, located in the Schelde near the Belgium border.

It is tidal water/land and the bottom is clay, so with low tide walking there is not so easy. If you take a boat at high tide then you have to be back before the water is gone.

In his search for a solution he found the Amphirol. the idea of the 2 floats with a corkscrew was not new. But what made his Amphirol unique was the ability to alter the angle of the floats. not only parallel but at an angle.
So when moving side ways, on a hard surface, (sand, dry clay) the vehicle can take a (wide) corner

In water and clay the vehicle move length wise,
By varying the rotating speed the vehicle makes a corner

The reason this Amphirol is know to DAF is that on the first proto type 2 old DAF engines including the Variomatic gear boxes where used.

Those DAF engines where under powered so the later version used 2 NSU rotary engines that had a much better out put in relation to there weight.

A Sundstrand Hydraulic installation gave power to the rolls