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 motorycle windshields
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runcyclexcski
Starting Member

United Kingdom
35 Posts

Posted - 05/07/2018 :  08:43:41  Show Profile  Reply with Quote
Has anyone tried standard wind screens for cruiser motorcycles? One can get one for under 100 USD/GBP/EU. Plus, they are (supposed to be) rated to be highway-tested, as opposed to some gizmo I blow using a resistive heater. If it breaks -> go and grab another one on ebay.

While reading up on DIY velomobile builds, I keep coming across elaborate schematics on how to bubble-blow acrylics, conical wraps, etc. I find this to be too elaborate and time consuming, with unpreditable results? I think I should try to use as much as possible of of the shelf components, as anything 'custom' brings the costs to the 10K only a few fanatics can afford. A moto wind shield may not be exactly 'the' perfect teardrop shape we want, but if it's a 20% reduction in perfomance at 3x savings in overall cost (by using standard components), I'd go for the standard components.


runcyclexcski

carolina
human power supergeek

USA
1059 Posts

Posted - 05/07/2018 :  12:21:14  Show Profile  Visit carolina's Homepage  Reply with Quote
Are u building a velomobile? Full canopy? Have any pics? This is conversaton for general section probably. Warren and others have the answers.

velosRus.com
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warren
human power expert

USA
6454 Posts

Posted - 05/07/2018 :  12:54:21  Show Profile  Visit warren's Homepage  Reply with Quote
Moto windshields are likely heavier and smaller than is practical for a velomobile, but let us know if you find something that would work!
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runcyclexcski
Starting Member

United Kingdom
35 Posts

Posted - 05/07/2018 :  13:49:26  Show Profile  Reply with Quote
I am not buildy-building yet, I am doing what I would consider "fundemental research" -- learning to build small parts which also can be re-used for other purposes, e.g. composite panels, tubes, etc. It appears that the shell and the windshield are the two parts of the velo that make velos expensive/time consuming/not_mainstream. I have some ideas about the shell (how to make it out of modular parts which can be reused for other projects, rather than a monocoque), but so far I had no idea how to make the windshield for cheap. I agree with the weight point, but since the windshield would be in front of the most useful part of the body (the brain) I am happy to go for more protection at the expense of weight. BTW most of the weigh is in my belly anyway.

The 'long-term project' is a volomobile-inspired enclosed e-bike. I think the design points are mostly the same -- light weight, small frontal area, tadpole trike, rear wheel drive. The rear wheel is a hub motor which can be removed and replaced with a chain drive if one is in an HPV mood (e.g. nice and sunny out), and installed back when one is in a miserable commute mood (rainy and grim, which is 90% the time in the UK). Ditto on the battery (removable).

runcyclexcski
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Grant-53
recumbent guru

USA
554 Posts

Posted - 05/10/2018 :  11:31:04  Show Profile  Reply with Quote
I tried that 30 years ago with marginal success. I would check out the canopy of a sailplane.
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runcyclexcski
Starting Member

United Kingdom
35 Posts

Posted - 05/11/2018 :  07:55:02  Show Profile  Reply with Quote
Grant, what was the issue? E.g. was it the odd shape that was hard to fit around?

Can you suggest a manufacturer for canopies? Last time I checked I found them rather expensive. Ideally, I am looking to make the windshield and the side windows separate, as in a convertible (to be able to ride with the top off in hot/nice weather). The front is what the moto one would be used for (and that's the one I am not capable of making reproducibly). The side ones would be made from a curved acrylic sheet (and that I am capable of).

I also looked into acrylic display half-spheres. I did not like the spherical shape (I would rather have a 1/2 ellipsoid), and I did not like the cost (3-4x higher than the moto screens)

runcyclexcski
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runcyclexcski
Starting Member

United Kingdom
35 Posts

Posted - 05/11/2018 :  07:56:38  Show Profile  Reply with Quote
quote:
Originally posted by warren

Moto windshields are likely heavier and smaller than is practical for a velomobile, but let us know if you find something that would work!


Warren, specs I came across mentioned 3/16 thick acrylic and 3 kilos (6 lbs) in weight. Sounds reasonable, no?

runcyclexcski
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Grant-53
recumbent guru

USA
554 Posts

Posted - 05/15/2018 :  14:27:33  Show Profile  Reply with Quote
The shape is the big issue since they are designed for a upright frame. If you can get by with a simple half cone form then a thin sheet clear material would do. Coroplast is listing a new clear product. Take a look at some aircraft paper models for shapes. Decide how much stone protection you want.
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warren
human power expert

USA
6454 Posts

Posted - 05/15/2018 :  18:36:18  Show Profile  Visit warren's Homepage  Reply with Quote
That sounds very heavy to me!
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carolina
human power supergeek

USA
1059 Posts

Posted - 05/15/2018 :  19:07:09  Show Profile  Visit carolina's Homepage  Reply with Quote
Warren taught me petg slight thinner than 1/16. I love it.

velosRus.com
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Grant-53
recumbent guru

USA
554 Posts

Posted - 05/16/2018 :  16:08:38  Show Profile  Reply with Quote
Check into snowmobile windscreens also. See carolina's velo.
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runcyclexcski
Starting Member

United Kingdom
35 Posts

Posted - 06/10/2018 :  10:57:52  Show Profile  Reply with Quote
A good compromise might be to get a 1/18 or 1/16 polycarb sheet (is there anything better on the market?), and bend it into a half-ellipse shape. This way I get the teardrop/ellipse facing the front. The sides will be flat, but bending a sheet into a 2D ellipse is not possible (except vacuum blow?

runcyclexcski
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