[python] Re: [python]Eureka!

  • From: George Durbridge <gdurbrid@xxxxxxxxxxxxxx>
  • To: python@xxxxxxxxxxxxx
  • Date: Sat, 24 Jul 2010 08:26:01 +1000

Rhysiart,

There's a lot here to think about; and I will.

In the meantime, happy birthday.

I checked out Erik Wannee's site again.  Although the direct link to
"Flevo Trike" is broken, I found a series of pages in English on Erik's
trike, by clicking on the bulleted list or the down-arrow at the bottom
right of each successive page, starting here:

http://www.wannee.nl/hpv/variatie/e-index.htm

George

On Fri, 2010-07-23 at 07:36 +0100, Rhisiart Gwilym wrote:
> George, I can give the answer to that straight away.
> 
> I think that it's pretty well certain that I'll be using the trike 
> format a lot, just as it is now. I can tell already that it's a very 
> satisfactory layout. It has a nice feel, even with the odd minor bug 
> to iron out. It rides easily and comfortably, though I've yet to take 
> it on a longer ride, to see how I feel after a few kilometres. The 
> Mages cheapo homemade suspension system is a real winner. 
> Ridiculously comfortable, even off-road. A really neat piece of 
> inventive appropriate technology. Mine cost me literally nothing but 
> the scrounging up of some bits of medium-soft rubber. Thanks again 
> Jurgen! And having a horizontal-axis articulation just behind the 
> suspension on the trike back-end means that I can actually feel the 
> two back wheels canting gently back and forth laterally between the 
> irregularities which they meet separately on a rough off-road 
> terrain, even whilst I hold the front end perfectly upright. You get 
> the knack just about instantly of letting your arms act as two 
> independent shock absorbers for that.
> 
> Also the back end being able to swing round the BB axle assembly that 
> I used to make the horizontal articulation means that there's 
> absolutely no torquing stress on the suspension arm. I pondered a lot 
> about that problem for a trike with a Mages central rear-suspension. 
> To deal with that problem I'd already designed in my imagination my 
> own version of the Wannee tilting trainer-trike idea, before Dirk 
> showed my that Erik had had the same idea before, and had actually 
> built one which works well. I think Erik has the item about his 
> training-trike only on the Nederlandse version of his website. It's 
> not on the English-language version, so I'd missed it. I assume Dirk 
> speaks Vlaamse, and saw it in Erik's Nederlandse pages. Is that right 
> Dirk?
> 
> It's quite weird having a trike which articulates in TWO places along 
> the length of the frame, and with the axes of articulation at right 
> angles to each other too. But whether riding or walking and pushing 
> it, it proves not to be a problem. Mind you, when walking this trike, 
> the fore periscope proves to be a winner too. What's a fore 
> periscope? Ah, wait for the pics. All will be clear......
> 
> The only tricky bit at the moment is parking the trike without the 
> whole front end just falling over. Coming round to seeing that 
> Jurgen's built-in bike stand idea may be the best solution. Cunning 
> Mages engineering inventions prove best again.....
> 
> I've no doubt either that I shall keep the bike back end, and crack 
> the knack of riding that too. Something that you just have to do, 
> isn't it. It's really remarkable the way that riding the trike around 
> just in the field over the past two evenings has pushed me forward in 
> getting the knack of how you balance a Python bike. Could never get 
> enough time going forward before I fell over in all my previous 
> efforts to learn. But the leaning front end on the practice-trike 
> format is, for all practical purposes still a bike. As Erik Wannee 
> asserts, you can't really tell the difference in behaviour. But it's 
> just that you have these two solid bracing handlebars on the fixed 
> upright back-end, to push against and keep yourself upright whilst 
> you're learning the new balancing reflexes. I expect that to come 
> pretty quickly now.
> 
> The great things about the trike are -- well, several:
> 
> There's a big freight space between the rear wheels (got that handy 
> point from Henk a year or so back with his 'Why I like the trike' 
> post, and stored it away as a key fact right up till now).
> 
> There's the stability on slippery roads. I ride right through the 
> Winter icy time, having only occasional use of a car, when it's 
> really necessary. I've really loved getting free, finally, from car 
> ownership. I hate being owned by the damned things!
> 
> And there's the real problem for me and the other old gaffers (70 
> tomorrow, literally) that I need to be able to wind myself slowly up 
> hills, and staying balanced on any kind of bike on the steep grades 
> has become a problem. That's why I still see occasionally what I used 
> to see all the time in my childhood: old bodies on bikes getting off 
> and pushing the bike up hills at a very gentle pace. These days I 
> realise why that's actually a pretty good tactic. But on a trike, I 
> can wind myself up the hill in the very low crawler bottom gear that 
> I have on all my bikes, and with the stable trithon, I can just sit 
> there smugly on my travelling recliner and wind away comfortably at a 
> power output that suits me. Great!
> 
> A small bonus with the horizontal-axis articulation between the trike 
> rear end and the rest of the cycle is that you can use this tactic 
> even when you're crawling up a steep road with a heavy camber: the 
> back end just sits at a slight angle from the level, but the rest of 
> the bike is perfectly upright under you. Great again! No getting 
> steered constantly into the curb by the camber, which can be a 
> nuisance with rigid trikes.
> 
> Having picked up my trike-format Python and felt the moderate weight, 
> even with the rather heavy-tubed bikes that I use for donors to build 
> it, I think that it's fair to call it a velo. And that means that 
> I'll be using it a lot more than any borrowed car, for the 
> all-purpose, all-seasonn runabout that velos are. All-weather too, as 
> soon as I've got the rain shield arrangements added on. Yeah, I know 
> that people say you can't put farings/rain deflectors on a FWD 
> centre-steer. But I have some ideas........
> 
> Pics of the bare trike/bike as soon as I can upload them. Pics of the 
> fared alleweder as soon as I've made that happen. The Autumn rains 
> will be coming soon. Better get going on it.
> 
> Pics soon.  Hwyl fawr,  RhG
> 
> >Excellent news!  When you have had a bit more time with the
> >python-trike, would you report back your conclusions on how satisfactory
> >a cycle it is in its own right, as well as for a trainer for the bike?
> >
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