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Anura |
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A Unique Delta Trike |
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The Greenspeed
Anura is designed to be easy to ride. Rather than having a low
seat like most tadpole trikes (2 wheels front, and 1 rear),
and some deltas (1 wheel front, and two rear) the Anura seat
is set at the same height as a kitchen chair, at 17 to 18
above the ground, plus there is no cross member or front axle
in front of the seat, so mounting and dismounting is much
easier. The higher seat also gives more confidence in traffic,
yet having the seat closer to the paired wheels than the
single wheel gives more stability than expected. Unlike other delta trikes the
Anura has a differential as standard equipment, which gives
balanced two wheel drive. And with 75% of the weight on the
driving wheels V 33% for a tadpole trike, the Anura has far
superior traction on loose or slippery surfaces, like gravel,
mud, or snow. The
three wheel disc brakes provide more powerful braking than
most trikes, and steering is light, positive, and accurate
with a small turning circle. To reduce weight the Anura frame
is made from 7005 aluminium alloy, and the rectangular main
tube allows the length of the frame to be varied by 10 inches
to suit the leg length of rider, while keeping the front frame
in perfect alignment. 16
wheels are standard on the Anura because they result in a
lighter and more compact trike, than could be built with 20
wheels. Furthermore with the special Scorcher tyres they roll
easier and give a better ride than most 20 wheels! However
for a still higher seat and more ground clearance, 20 rear
wheels are now available, and later in 2013 there will be a
20 front wheel option. Another feature of the Anura is
the square section rear axle brace tube, which has been
designed as an integral towbar, and has a 12 mm boss which can
be used for towing trailers, or for accepting the Tandem
Coupling. This Tandem Coupling enables the Anura to be
converted to a tandem, triplet or even a train of Anuras, by
removing the front wheel of the stokers Anura, and fixing
the forks to the coupling. This has meant that a number of
people with serious health issues, who thought they would
never, ever be able to cycle again, are now riding again with
their loved ones! In fact the easy mounting of the Anura and
its adaptability has seen riders with serious illnesses, like
for example MS, make miraculous improvements to their life
through regular exercise in riding the Anura. |
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Two Anuras coupled in tandem - 4 wheel drive! |
Tandem coupler |
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Unlike the GT, the seat on the
Anura is adjustable for angle, and to cope with the more
upright seating position favoured by many delta trike riders,
the base of the seat has 3 of foam rubber to make a really
plush seat, with some measure of suspension. And unlike many
bikes with aluminium frames, there is fair amount to vertical
flex built into the frame. Thus the combination of the special
Scorcher tyres, the seat and frame, you can be sure of a
smooth ride. Further Anura features are the narrow width to
provide easy negotiation of bollards, gates and even standard
house doorways, plus the vertical parking facility, so that it
will take up very little space when parked. There are now four versions of
the Anura :- 1.
1.
The
RL Anura has the standard 27 speed derailleur gear
system, comprising of a 9 speed rear cassette and derailleur,
plus a triple crankset. This gives a gear range of 14 gears
from 18 to 80 inches. This setup uses a mid-cage rear
derailleur, giving 2 of ground clearance with the standard
16 wheels. 2.
2.
The
SL Anura has the Schumpf Speed Drive instead of the triple
crankset. This is a two speed bottom bracket which does away
with the front derailleur and derailleur post, making the
front of the trike a lot cleaner and easier to mount. There is
less overlap of gears with 18 possible gear combinations
giving a range from 21 to 87 inches with 13 individual gears.
This system only needs a short cage rear derailleur, giving
3 of ground clearance with the standard wheels. Another
advantage of this system is that the Schumpf can be changed
while stationary, so that if you have had to stop suddenly
without time to wind down the derailleur gears, you can just
hit the Schumpf button, and it will drop the equivalent of 4
derailleur gears to enable an easy take off from rest. 3.
3.
The
IGH Anura takes the internal gearing one step further. As well
as discarding the front derailleur, we now discard the rear
derailleur and use a much cleaner method of changing gear than
pushing the chain from one sprocket to another. IGH means
Internally Geared Hub, whereby the gears are inside the hub
instead of being exposed to road muck on the outside of the
wheel. Almost any IGH can be used in the Anura, from a 3 speed
Sturmey Archer to the 14 speed Rolhoff hub with a 500% range.
However our standard set-up uses the Nu-Vinci continuously variable hub, the N360, plus the Sclumpf Speed Drive.
This hub is an incredibly quiet and smooth hub with NO steps
or clunks in changing gear as there are no gears inside the
hub! It is continuously variable between the ratios of 1:0.5
to 1:1.8 (360%) and with the Schlumpf, this range is increased
to 594%, or from 14 to 86 inches. Like the Schumpf, the ratio
can be changed while stationary as well as under power. The
complete absence of a rear derailleur or tensioner means not
only less maintenance, but a more than doubling of the
standard ground clearance of the SL from 3 to 6.5 with
the standard wheels.
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IGH Anura |
Nu Vinci Drive |
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1.
4.
The
Anura Quad is a quadricycle rather than a tricycle. While the
narrowness of the Anura is very handy for getting through
tight places, some people wanted more stability. So how to
make it more stable while still retaining the narrow width and
the high seat? Answer add a wheel! The problem with adding
a wheel to a tadpole trike is that on uneven ground one of the
rear wheels will leave the ground, so if there is only one
wheel drive, or two wheel drive with a differential, you will
suddenly have no traction!
And if you use two clutches, turning will be
compromised. However with the Anura, thanks to the superior
weight distribution, both drive wheels stay firmly on the
ground, if a front wheel lifts, the other wheel seamlessly
takes over the steering duties of both front wheels. After
all, at this point it is just becoming a trike again! The Quad
is achieved by changing the trike front frame for a Quad front
frame, so it can be retro fitted to an existing Anura trike,
and one could even have a trike or quad just by changing the
front ends. Standard gearing on Quad is the 9 speed 11-28
cassette. However this could be upgraded with an 11/34
cassette or a Schumpf Drive.
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ANURA HISTORY - Design and Development
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