[python] Re: Geared Steering
- From: Logan Streondj <weyounet@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Tue, 28 May 2013 12:20:31 -0400
the gears, kinda make it so can stabilize the boom in a certain position by
holding the levers in place, minor adjustments possible for slight turns
and such.
I don't mean that all steering should be done that way, merely when
necessary to stabilize the boom in a certain position or make minor
adjustments like going downhill, or at high speed.
If some kind of handlebars that have fewer moving components can do it as
well, then I'd happily use those instead.
On Tue, May 28, 2013 at 12:17 PM, Logan Streondj <weyounet@xxxxxxxxx> wrote:
> well I was thinking mostly to stabilize things like going downhill very
> fast,
> I read a review online that said it was "puckerish" and he could only
> achieve a speed of 66kph vs 90+kph with rigid boom, had to engage the break
> and even then it wasn't pleasant.
> http://www.recumbents.com/forums/topic.asp?TOPIC_ID=4226
>
> I like the python center-steering, but I'd also like to be able to go fast
> downhill without having to do too much work getting it to go straight.
> There are a bunch of hills in my area with relatively high speed traffic,
> so it's important that can maintain control.
>
> If ordinary handlebars are enough to make it easy to go downhill at high
> speed, then I guess that'll be enough,
> it was just my understanding from that post that it wasn't, though perhaps
> they weren't using handlebars for that downhill testing.
>
>
> On Tue, May 28, 2013 at 11:13 AM, Patrick van Gompel <
> patrick_van_gompel@xxxxxxxxxxx> wrote:
>
>> My thoughts:
>> A Python is a leg/hip steered bike. You can have handle bars anyway you
>> like, but for a newcomer it might be even more confusing. You really need
>> to learn to steer in a different way and forget about steering with your
>> hands.
>> I did have and still have a handle bar on my Python(trike). When I learnt
>> to cycle I always got rather tired arms, because my legs would go one way
>> and my arms tried to correct that (which was bad). Now I use the handle
>> bars for extra stability and sharp cornering.
>> Looking at your drawing:
>> Unless you succeed in making this a durable construction I doubt it will
>> survive the big forces for much time.
>> I am not saying you should't try it, but why do you prefer this
>> construction above a simple handle bar?
>> Why are you worried for the forces at high speeds? I am more worried for
>> slow speeds and when you legs go one way and your arms try to go the other
>> way. At high speeds you don't need much force to steer imo.
>> I am not entirely sure, but if you have a 1:1 ratio I think you will have
>> a hard time steering your bike with your arms only. Though, it also depends
>> on the lenght of your levers.
>>
>> Patrick
>>
>> ------------------------------
>> Date: Tue, 28 May 2013 10:44:57 -0400
>> Subject: [python] Re: Geared Steering
>> From: weyounet@xxxxxxxxx
>> To: python@xxxxxxxxxxxxx
>>
>>
>> hmm, well the ones I linked to are 3:1 and I think it's already too much,
>> I think 1:1 is okay considering have levers at both arms, and it also would
>> make it the same refinement of motion as on a normal bike.
>>
>> Based on your recommendation, you might have a different Idea than I
>> about how the gears are to be implemented, so I've drawn a crude crayon
>> diagram to hopefully get us ":on the same page" [image: Inline image 1]
>>
>> I made it based on the picture of the pivot at
>> http://www.python-lowracer.de/pics/kick_stand_with_steering_stop.jpg
>> the gear would go approximately where the bell is now.
>>
>> Also I realize having the diagonal levers may make it too close to the
>> seat, so could probaly make them kinda like L's so they give enough
>> clearance.
>>
>>
>> On Tue, May 28, 2013 at 9:34 AM, Peter Švančárek <
>> peter.svancarek@xxxxxxxx> wrote:
>>
>> to low gearing ratio probably... long lever would be better.
>> Maybe planetary gear would be better? with ratio at least 1:10-20
>>
>> Dňa 28. 5. 2013 15:15 Logan Streondj wrote / napísal(a):
>>
>> Hey,
>> I was wondering if can improve the steering at high speeds,
>> perhaps by having some kind of gearing mechanism on the pivot,
>> that would for instance move levers on either side,
>> the levers could be used to hold the pivot at a certain angle, or change
>> it to an appropriate one.
>>
>> perhaps bevel gears could be used.
>> If for instance the lever gears are mounted on the back boom,
>> and the pivot gear controls the front boom,
>> then could have very precise control of the front-back boom angle.
>> main issue I guess would be finding good mounting options,
>> and making sure it has enough strength to withstand the forces at high
>> speeds.
>>
>>
>> That way can finally achieve the inital goal of using it as a low-racer,
>> rather than a low-walker as it kinda is now.
>> who knows, might even win at some recumbent bicycle races.
>>
>> It may also make it easier to learn for newcomers, since there would be
>> some kind of steering available.
>>
>> Perhaps something like the larger of these gears could be used
>> http://www.ebay.ca/itm/5-9mm-Pinion-Shaft-Dia-Straight-Bevel-Gear-Spare-Parts-/390574215222?pt=LH_DefaultDomain_0&hash=item5af0099036they
>> are $10 on ebay and I saw some for 6 not too long ago, would need
>> three, one for the pivot, and two for the levers on either side.
>>
>>
>>
>>
>
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