A straight sided fairing ?

[sendler]

Much of this has been discussed in other threads going back a few years.
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http://ecomodder.com/forum/440784-post225.html
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My new tail is a complete non issue with regard to cross winds. Even the full streamliners are minimally disturbed by cross winds as long as there is an open vent for the pressure differential at the point of max thickness/ lift.
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[PeterS]

I've been thinking along the lines of sliding "doors" that could be slid back inside the rear to cover those openings in the interests of reduced drag. That would seem to require the flat sides.

[Grant-53]

Actually the doors could be flat or concentric. The larger cross section would be in front so the door would slide on the outside as in the minivan application.

[sendler]

A straight sided fairing leaves a huge wake since it is not streamlined. But at least the rider can gain some weather protection and some useful locking storage.

[PeterS]

I think I need to bandsaw out a shape, take a photo and post it to give you an idea of what I have in mind.....

[PeterS]

Here are few photos of a rough model I made today. The sides are flat and the maximum cross section is around mid way but there is no foil. The rear could be narrowed more or even tapered a little without generating lift.

It is quite similar to the Vetter fairing and would have the same frontal area . Could i have some comments on this idea ?

[Xist]

Honestly, it would be much more aerodynamic if you tapered the sides. You punch a hole through the air and if your vehicle taper, you leave a smaller hole, creating less drag. The back of my Civic tapers a few inches behind the rear wheels. This is pretty standard. The Gen1 Insight tapers more than most cars and it is very aerodynamic.

[sendler]

I see now that you mean to taper the sides so they are narrower in the back. By "straight sided" I had assumed that you meant parallel. The Vetter tails are tapered at 16 degrees and flat sided just like your truncated tail that you are showing.

[PeterS]

Originally Posted by sendler

I see now that you mean to taper the sides so they are narrower in the back. By "straight sided" I had assumed that you meant parallel. The Vetter tails are tapered at 16 degrees and flat sided just like your truncated tail that you are showing.

I guess I should have labelled the model .... it is tapered the 16 degrees as per the Vetter form but without the curve. The sides are flat .... but not parallel.

Thus some increase in drag is likely but far less side lift.
The side lift is something that worries me a great deal, the winds were i ride are extremely variable and if i ride on main roads or freeways the are a large number of very large trucks of the huge moving van variety.

Side lift could easily toss me into the path of another vehicle.

As little side lift as possible is preferable, even at the cost of drag..

[sendler]

Originally Posted by PeterS

I guess I should have labelled the model .... it is tapered the 16 degrees as per the Vetter form

All the Vetter tails have straight sides.