[python] Re: Leaning trike
- From: Patrick van Gompel <patrick_van_gompel@xxxxxxxxxxx>
- To: <python@xxxxxxxxxxxxx>
- Date: Sun, 1 Jul 2012 23:30:41 +0200
Hey Vi,
My idea of my Pythontrike being too stable is caused by the inability to take
sharp corners at high speed. On my regular cycling road to work, there is a 90
degree turn and I often tried to take it at higher and higher speeds. But at
-let's say- 25km/h I am unable to smoothly lean/steer enough to take the
corner. It just doesn't want to lean enough to be able to take the corner at
that speed. Only if I start to lean very early in the corner (more than
actually needed) and then when being in the middle of the corner add some body
weight, I am able to take higher speed turns. Or, another option is to throw
myself into the corner forcefully (using body weight).
Because of the arms of the jetrike, the rear becomes wider when turning.
Estimating the width of your trike, whether you can fit inbetween two poles,
becomes harder. I have a general feeling of the width of my trike and trailer,
but when I take a corner the width changes and sometimes I hit the edge of a
bump/pole or whatever, when I take a corner. And since the width of my trike is
rather close to the usual door width of buildings, I always need to put my bike
in a straight position when going through it. Just some practical things, but
sometimes it's annoying.
And yes, when my front wheel is going to slip, the trike becomes rather
unstable.
Oh sorry, no, my video was from the rear (delta trike like I have now). There
is a little Lego man on it facing the proper position, but that might have been
unclear, haha.
No I haven't considered a tadpole trike since I definately need two wheels in
the rear. The reason for that is that I need to pull a heavy trailer and the
best option for a hook is inbetween two rear wheels.
That's a nice bike in your video, but I would prefer a separated leaning and
steering input for my usage. So that I can change how much I lean when taking a
corner.
Patrick
Date: Fri, 29 Jun 2012 20:42:43 -0700
From: vi_vuong@xxxxxxxxx
Subject: [python] Re: Leaning trike
To: python@xxxxxxxxxxxxx
Hi Patrick,
Please clarify if you mean "pythonjetrike still seems to be too stable ... when
cornering" or unstable with track width changing, and also the riding surface
(tarmac, dirty, snow...) I am guessing that you meant unstable on a loose
surface.
On your video at first glance, the lego prototype looks like a tadpole trike.
Have you consider such design? Just FYI, on a tadpole w/ center steer the
track is fixed and the upper body leans with the rear frame into the corner to
turn, so the motion is more natural and stable compared to non-tilting delta /
tadpole trike. Trouble with this design is that FWD is more complicated than
RWD (axle or outrigger like this one http://www.youtube.com/watch?v=WTM85zmWPnA)
Cheers,
Vi
On Jun 28, 2012, at 12:00 PM, Patrick van Gompel
<patrick_van_gompel@xxxxxxxxxxx> wrote:
Thanks for the input guys.
Yes Henry, I have been looking at your design before (nice idea indeed). The
reason I want a different setup is that I prefer more control over the
suspension (especially when a trailer is attached). When using a air spring I
can easily adjust tension and rebound, or could even lock it when the trailer
is too bouncy on the rear. I hope this new design will solve my problems with
high speed cornering too. My pythonjetrike still seems to be too stable and I
think I prefer a steady trackwidth when cornering.
I am also thinking about front suspension, because -as you say- it gives more
benefit to the whole. Though, that will be a different story.
Greetings,
Patrick
From: whpthomas@xxxxxxxxx
To: python@xxxxxxxxxxxxx
Subject: [python] Re: Leaning trike
Date: Fri, 29 Jun 2012 04:22:39 +1000
Here are some photos of how I resolved the addition of suspension to my tilting
trike using elastomers. In reality, the front wheel carried a greater
proportion of the riders weight, so the benefits of adding suspension to the
rear was limited - though it did make some difference.
<BILD0453.jpg>
<BILD0455.jpg>
http://jetrike.com/jetrike-mods.html
Kind regards,
-h
On 28/06/2012, at 9:57 PM, Patrick van Gompel wrote:Hello,
I am planning to build a new leaning Python trike and made a simple setup out
of Lego.
See: http://www.youtube.com/watch?v=uZ7Gv4rE-Vk
Does anyone have experience with this kind of leaning/suspension? Any ideas
about pros and cons?
Thanks,
Patrick
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