trike attachment?

Werehatrack wrote:

On Mon, 26 Jul 2004 00:20:16 -0500, Tom Sherman
wrote:


Werehatrack wrote:


One consideration to keep in mind; the cheaper kits generally are set
up to drive only one of the rear wheels, and while that works, it's
not necessarily as good as using an axle with a differential that
drives both wheels. One-wheel-drive is, however, vastly preferred
over a straight axle that drives both wheels; this is not a safe setup
for a trike, as it makes steering very dodgy...and downright
impossible at times....

Most purpose built delta trikes drive only one rear wheel. A
differential adds significant cost and complexity.


It also adds another drawback; unless the diff is equipped with a slip
brake (in automotive apps, this is called "posi-traction") the
effectiveness of the drive will be completely lost when *either* rear
wheel lifts off the road. With one-side-drive, you only lose drive
effectiveness when the driving wheel lifts. There are reasons to
prefer each of these, but when cost is taken into account, the
one-siders tend to win. I had a one-sider as a delivery vehicle back
in the early '70s; I don't miss it.

Another approach is to use an axle with no differential to drive both
wheels, but to use freewheeling hubs. This allows the inner wheel to
coast while turning, but delivers power to both wheels in slippery
conditions. I know of one homebuilt delta trike using this arrangement.

--
Tom Sherman – Quad City Area

Tom Sherman Wrote:
Werehatrack wrote:

On Mon, 26 Jul 2004 00:20:16 -0500, Tom Sherman
wrote:


Werehatrack wrote:


One consideration to keep in mind; the cheaper kits generally are
set
up to drive only one of the rear wheels, and while that works, it's
not necessarily as good as using an axle with a differential that
drives both wheels. One-wheel-drive is, however, vastly preferred
over a straight axle that drives both wheels; this is not a safe
setup
for a trike, as it makes steering very dodgy...and downright
impossible at times....

Most purpose built delta trikes drive only one rear wheel. A
differential adds significant cost and complexity.


It also adds another drawback; unless the diff is equipped with a
slip
brake (in automotive apps, this is called "posi-traction") the
effectiveness of the drive will be completely lost when *either*
rear
wheel lifts off the road. With one-side-drive, you only lose drive
effectiveness when the driving wheel lifts. There are reasons to
prefer each of these, but when cost is taken into account, the
one-siders tend to win. I had a one-sider as a delivery vehicle
back
in the early '70s; I don't miss it.

Another approach is to use an axle with no differential to drive both
wheels, but to use freewheeling hubs. This allows the inner wheel to
coast while turning, but delivers power to both wheels in slippery
conditions. I know of one homebuilt delta trike using this
arrangement.

--
Tom Sherman – Quad City Area

No the outer wheel doesn't coast. As long as the inner is on the
ground the the outer wheel coasts - the inner wheel is tracking the
shorter radius, the outer wheel is tracking the larger turning radius.
If the inner wheel lifts the outer wheel drives rather than coasts but
the inner wheel is still being driven rather than coasting.


--
meb

Tom Sherman Wrote:
Werehatrack wrote:

On Mon, 26 Jul 2004 00:20:16 -0500, Tom Sherman
wrote:


Werehatrack wrote:


One consideration to keep in mind; the cheaper kits generally are
set
up to drive only one of the rear wheels, and while that works, it's
not necessarily as good as using an axle with a differential that
drives both wheels. One-wheel-drive is, however, vastly preferred
over a straight axle that drives both wheels; this is not a safe
setup
for a trike, as it makes steering very dodgy...and downright
impossible at times....

Most purpose built delta trikes drive only one rear wheel. A
differential adds significant cost and complexity.


It also adds another drawback; unless the diff is equipped with a
slip
brake (in automotive apps, this is called "posi-traction") the
effectiveness of the drive will be completely lost when *either*
rear
wheel lifts off the road. With one-side-drive, you only lose drive
effectiveness when the driving wheel lifts. There are reasons to
prefer each of these, but when cost is taken into account, the
one-siders tend to win. I had a one-sider as a delivery vehicle
back
in the early '70s; I don't miss it.

Another approach is to use an axle with no differential to drive both
wheels, but to use freewheeling hubs. This allows the inner wheel to
coast while turning, but delivers power to both wheels in slippery
conditions. I know of one homebuilt delta trike using this
arrangement.

--
Tom Sherman – Quad City Area

No the outer wheel doesn't coast. As long as the inner is on the
ground the the outer wheel coasts - the inner wheel is tracking the
shorter radius, the outer wheel is tracking the larger turning radius.
If the inner wheel lifts the outer wheel drives rather than coasts but
the inner wheel is still being driven rather than coasting.


--
meb

OOPS- That should rear- no the inner wheel doesn't coast. As long as
the inner is on the ground the the outer wheel coasts - the inner wheel
is tracking the shorter radius, the outer wheel is tracking the larger
turning radius. If the inner wheel lifts the outer wheel drives rather
than coasts but the inner wheel is still being driven rather than
coasting.[


--
meb

OOPS- That should rear- no the inner wheel doesn't coast. As long as
the inner is on the ground the the outer wheel coasts - the inner wheel
is tracking the shorter radius, the outer wheel is tracking the larger
turning radius. If the inner wheel lifts the outer wheel drives rather
than coasts but the inner wheel is still being driven rather than
coasting.[


--
meb

meb wrote:
OOPS- That should rear- no the inner wheel doesn't coast. As long as
the inner is on the ground the the outer wheel coasts - the inner wheel
is tracking the shorter radius, the outer wheel is tracking the larger
turning radius. If the inner wheel lifts the outer wheel drives rather
than coasts but the inner wheel is still being driven rather than
coasting.[

Now we have everyone confused. I should know better than to post
after the end of a 12+ hour workday.

--
Tom Sherman – Quad City Area