Mirek
So the axle will become a torsion arm spring giving anti-roll as a side effect.
Somewhere on the net there is a torsion spring calculator that would tell the
arm thickness for a given load and length ?
Wonder what would be better :-
One axle welded to each swing arm ?
Two axles half the length of the above ?
Two axles same length as single side by side , slightly staggering wheels ?
This arrangement would be very compact and fit in the unusable area above the
frame and directly behind the seat :-) that I like.
regards Paul
On 16/02/2020 18:00, mircosoft@xxxxxxxxxx wrote:
The swingarms would be welded to the axle. So if you lift one wheel, the other one lifts============================================================
too. Torsional stiffness of the axle determines the amount of lift: perfectly stiff = no
cornering roll, but some "bump roll" as with unsuspended trike. Perfectly
flexible = the same as having two independent swingarms. Some sweet spot in between =
optimum.
Thinking more about it, it would also simplify the bearings, because you would
only need two bushings at the axle ends, not two bushings for each arm. And the
axle would make a nice long torque arm to catch lateral loads from the wheels.
Hmmm... I guess I should have come up with this idea before I designed my trike
without suspension :-D.
M.
On February 16, 2020 12:27:05 AM GMT+01:00, paul needham
<paul.2.needham@xxxxxxxxx> wrote:
Mirek
Not sure why this produces anti-roll ? if the swing arms can move
around
the axle then it plays no part in anti-roll ?
Surely anti-roll should be a rod between the swing arm wheel ends and
the chassis ?
regards Paul
On 15/02/2020 16:42, mircosoft@xxxxxxxxxx wrote:
Hi Paul,think the best option would be to mount the wheels on swingarms. The
Considering your cantilevered rear hubs and heavy duty loadbed, I
axle they swing around can go all the way through and link them
together, reducing outward leaning in corners ("anti-roll bar"). Rubber
blocks would fit this setup pretty well.
Regards<dmarc-noreply@xxxxxxxxxxxxx> wrote:
Mirek
On February 15, 2020 4:49:24 PM GMT+01:00, Vi Vuong
ofHi Paul,
Have you tried thicker seat cushion? 2” dense foam over few layers
<paul.2.needham@xxxxxxxxx>cardboard is good enough for me. Soft balloon tires also help.
Vi
On Feb 15, 2020, at 3:14 AM, Paul Needham
outwrote:
Gerald
I ride over poor surfaces but no the kind that would be smoothed
consideredmuch by having the whole rear end sprung.
I was hoping that by using the ' bike ' suspension for each rearwheel it would reduce the individual load on the pivot components
compare with both wheels pivoted and sprung from one point ?
As I cannot ride a Python bike and only a trike I have not
<paul.2.needham@xxxxxxxxx>:leaning , or course leaning on it's own is not suspension it just
reduces the cornering forces and increases complexity and weight.
regards Paulwould create outside lean when cornering? Unless you hace some lean
On Sat, Feb 15, 2020 at 8:57 AM Gerald <bepb@xxxxxx> wrote:
Hello Paul,
any special reason for separate suspension? I would expect that
steer construction in mind?
nasty shake, specaly in Winter when one wheel might have to run onI am thinking about suspention for my trike too. It can give you a
gravel or ice.
regards Gerald
Am 15.02.2020 07:56 schrieb paul needham
<https://atomiczombie.com/forum/threads/my-life-with-python-trikes-mk1-mk1-5-mk2.33/>corneringJürgen
Each wheel with a block of it's own.
I realise there is a risk of it not being rigid enough for the
block,stress ?
Only one way to find out :-)
regards Paul
On 15/02/2020 06:53, Jürgen Mages wrote:
Hi Paul,
do you want to suspend the whole trike rear end with one rubber
oder each rear wheel with its own block?
regards Jürgen.
Am 14.02.2020 um 09:05 schrieb paul needham:
Hi all
Been riding my trike for 6 years now My Python trike builds
>from innerhowever a fewand fancy building a new rear end with suspension.
The original Python suspension looks the easiest option ,
? I amquestions ?
1) Will using 20" forks and wheels change any of the dimensions
under 80kg but may want to carry up to 20kg of camping gear ?
2) Is the rubber block available in Germany say from Ebay ?
3) If I decided to make my own as suggested using circles cut
============================================================mind theretubes how tall should it be ? and what diameter bearing in
python-request@xxxxxxxxxxxxxwill be 2 wheels suspended.============================================================
regards Paul
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