[python] Re: Building a cargo style trike
- From: Vi Vuong <vi_vuong@xxxxxxxxx>
- To: "python@xxxxxxxxxxxxx" <python@xxxxxxxxxxxxx>
- Date: Fri, 13 Sep 2013 19:55:09 -0700 (PDT)
Hi All,
Use of coaster brake has been pretty smooth, other than gearing limitation of a
single-speed (16-20in donor). With regular multi-speed setup, front rim brake
has been pretty rough on the pivots, so rear only. So far only one head-tube
pivot is tight enough to withstand front braking. Perhaps this is the downside
of using head tube as a pivot. Otherwise, the pivots have been holding up
pretty well...
Now, multi-speed coaster-brake hubs would fix issues, plus the ability to shift
at stop. However, they are more expensive / harder to find. Cheaper/safer
solution is probably to slow down...
Paul, I like your idea of extending the wheelbase. It would be nice to have
sliding frame with quick release lock, like a ladder?
Cheers,
Vi
>________________________________
> From: Patrick van Gompel <patrick_van_gompel@xxxxxxxxxxx>
>To: "python@xxxxxxxxxxxxx" <python@xxxxxxxxxxxxx>
>Sent: Friday, September 13, 2013 3:52 PM
>Subject: [python] Re: Building a cargo style trike
>
>
>
>
>Gerald, thanks a lot for writing down your experiences!
>
>Thanks,
>Patrick
>
>
>
>________________________________
>Date: Fri, 13 Sep 2013 22:50:08 +0200
>From: bepb@xxxxxx
>To: python@xxxxxxxxxxxxx
>Subject: [python] Re: Building a cargo style trike
>
>
>Hi Patrick,
>actually, a quick and hard hit on the rear breaks works fine. Both
wheel will be blocked and there is some breaking power and little
hassle.
>If you break only slightly, there is too, no issue. If you break
strong but do not block the rear wheels, the breaking will create
some agitation in the rear section off the bike. Disconcerting,
but actually never had any serious issues with it.
>
>When I first set up the trike, I had two separate break levers,
one for each rear break. I expected that using the right break
would initiate a right turn, but this is not the case with the
python trike, at least not with mine.
>If you would hit the right rear break, the bike would actually
make a little movement to the left, and then more or less continue
strait.
>The reason for this is, I think, that breaking the right rear
wheel creates an impulse on the pivot to the right. This is
turning the front part of the python slightly left.
>After this short impulse, the rear part will balance itself, with
the right, breaking wheel a bit behind and both tires rubbing,
only a bit, 'square' over the street.
>The overall direction is simply still where the front part is
pointed to.
>
>After this experience I decided that two separate break levers for
the rear breaks are useless on the python trike and got a lever
for two bowden cables.
>None the less, a backup breaking system is imperative if you use
the bike day by day. And the rear breaks get the bike to a halt,
just not as fast as the front break.
>The front break on the python trike is a very effective! It just
takes a lot flip you over the front wheel, its also not as much an
issue if you block the front wheel, you have a lot of weight on
the front wheel and with the breaking it gets even more. If you
have a coaster break, the break power will help you to hit the
break even harder. I don't want a mountain, racing or any other
upright bike behind me if I hit the break.
>
>Best regards
>Gerald
>
>
>Am 13.09.2013 17:55, schrieb Patrick van Gompel:
>
>Hi,
>>
>>I want to add just another opinion on the rear brakes of a
python trike: because I thought it was too much hassle I didn't
add them to my trike, but I wish I had.
>>Gerald is right that the front brake is much more effective and
if you cycle in good road conditions I think you probably won't
need them. Though, with a trailer behind my trike I did have a
few instances that my front wheel was slipping and I had to get
my feet on the ground to add more breaking power and to keep the
trike level (I have a leaning one). Since I don't have rear
brakes I am not 100% sure, but I think rear brakes would have
added more breaking power and would have helped to keep the
trike more stable.
>>Since you are talking about a 35kg load at the rear of your
trike I would consider having rear brakes although you would
probably hardly ever need them.
>>In my eyes it's the same as with brakes on a bicycle: you can do
without the rear, but always breaking with both brakes at the
same time makes it safer.
>>Though, I have no idea what happens with a trike if you
accidently break hard and both your rear wheels are slipping.
Gerald, did you ever try that while cornering?
>>
>>Greets,
>>Patrick
>>
>>
>>> Date: Thu, 12 Sep 2013 23:09:10 +0200
>>> From: bepb@xxxxxx
>>> To: python@xxxxxxxxxxxxx
>>> Subject: [python] Re: Building a cargo style trike
>>>
>>> Hi Paul,
>>> welcome to the python mailing list!
>>>
>>> Question 1:
>>> I have rear breaks on my python trike, but actually never
use them. They
>>> are pretty ineffective compared to the front break and
also can't be
>>> used to support the steering.
>>> On a python two wheeler, I find the rear break great to
control the
>>> speed on fast descents. With the trike this is spoiled by
the agitation
>>> caused by small differences in the breaking power between
the rear wheels.
>>>
>>> The only break I actually use on the trike is a coaster
break in the
>>> front wheel, which is pretty effective in this
configuration.
>>> Be careful to keep the bike strait with you legs if you
break hard with
>>> the front break, otherwise it might fold!
>>>
>>>
>>> Question 2:
>>> Why not? Just take care that the spanners are secure!
Alternatively you
>>> could just have two rear parts or two mounting points for
the rear
>>> wheels on the frame.
>>>
>>> If the wheelbase is to short you might also have problems
with the front
>>> wheel slipping on steep climbs.
>>> Having to put load behind the rear axle makes it even
worse.
>>>
>>> BR
>>> Gerald
>>>
>>>
>>> Am 10.09.2013 17:33, schrieb Paul Needham:
>>> > Hi all
>>> >
>>> > Short intro , I am recently retired @ 58 been riding
recumbents 2 & 3
>>> > wheels for 6+ years live in the UK and do a little
TIG welding.
>>> >
>>> > I currently ride a Hase Kettweisel a capable trike
but with a few
>>> > niggling problems and for my needs a few
shortcomings ?
>>> >
>>> > So I am looking to build myself a replacement that
addresses some of
>>> > the above.
>>> >
>>> > I want to :-
>>> >
>>> > Be lower than the Kett it has a seat height of 15" [
38 cm ] and a BB
>>> > height of 19.5" [ 49 cm ] yet it's ground clearance
is only 4" [ 10 cm ]
>>> > Be shorter if possible , certainly when not in load
carrying mode.
>>> > Get rid of all that flapping chain
>>> > Have the ability to carry camping stuff like the
Hipparion Protohippus 2
>>> >
>>> > I quite like Ed's RedTrike as can be seen on the
Python trikes page it
>>> > looks very simple and uncluttered and he has been
most helpful in
>>> > explaining how and why it was built that way.
>>> >
>>> > However carrying lot's of camping gear will require
my trike to be
>>> > build slightly differently to Ed's so I have some
questions that I
>>> > want to ask here ?
>>> >
>>> > Question 1
>>> >
>>> > Would I need rear brakes ? I assume my camping load
will be about 35
>>> > kg I weight about 70Kg ?
>>> > By law I need 2 brakes so I will probably put 2 on
the front wheel [
>>> > 20" wheels all round ]
>>> > The Kett only has 2 rear brakes , however weight
distribution is
>>> > completely different to the Python
>>> >
>>> > Question 2
>>> >
>>> > Wheel base , Ed admits his would be better a little
longer [ but he
>>> > needs to get his inside a vehicle and so has to be
that short ] the
>>> > Hipparion has a WB of 1 metre and I can build Ed's
to that length
>>> > easily enough. I wondered whether to make the rear
length adjustable
>>> > with just a couple of spanners like this ?
>>> >
>>> >
[url=http://postimage.org/][img]http://s20.postimg.org/hm59dl0zx/rear_end_extending_sm.jpg[/img][/url]
>>> >
>>> > [url=http://postimage.org/app.php]screenshot captor[/url]
>>> >
>>> > I hope the link works I am new to this image hosting
stuff.
>>> >
>>> > So in normal use it would be 1 metre but when
camping [ maybe only 2
>>> > or 3 times a year ] I could lengthen it ?
>>> > I think my camping gear may be bulkier than Esko's
and so could do
>>> > with an extra 30 - 40 cm
>>> >
>>> > thanks for you help Paul
>>> >
>>> >
============================================================
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>>
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