Motorcycle aerodynamics, a slippery and windy, slope?

[sendler]

Way too much side area and a side CoP way above the CG. This is the extreme case and it is easy to see how a strong side wind blast will blow the top of this thing right over on it's side.

[renault_megane_dci]

Would you walk around on a windy day with a sheet of metal that big ?

The thing looks like a sail from the side !

[Frank Lee]

I always thought Honda didn't put their best engineers on this one...

[PeterS]

One way around the side lift problem is obviously to have flat sides, round the nose as nicely as you like but to the full width then make the sides dead flat tapering a little to the rear.

It's not a pleasant idea aesthetically but there would be no side lift and no requirement for open sides to even dissimilar pressures.

[sendler]

Straight sides would have a poor coefficient of drag which is the whole reason to streamline a motorcycle in the first place.

[PeterS]

It would be good to see experimental confirmation of that . A lot of aircraft have essentially straight sides.

[sendler]

Only really long aircraft have a straight section in the middle. But still have streamlining on both ends.

[sendler]

Some of my favorite info posted on Ecomodder by Aerohead:
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[PeterS]

Originally Posted by sendler

Some of my favorite info posted on Ecomodder by Aerohead:

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Indeed , excellent graphics but as we all know 2 wheels present problems of their own . I'm suggesting a compromise for real world use and that means traffic and trucks with quickly appearing and disappearing airflow blasts for either side not to mention natural cross winds.

I'm suggesting a rounded nose that doesn'rt come too far back then straight sides converging to a Kamm tail with a bit of straight sided taper so as NOT to general side lift.

The top and underside can be as faired as possible as per the drawings .

It's an aerodyamic compromise but it's also about staying alive in traffic. Three wheels and the stability they offer would solve a lot of these side lift problems and allow optimum fairing.

[aerohead]

This may be redundant info.
Rider safety was paramount with the E-Z-HOOK streamliner project.Some of the designs were rejected on account of stability issues.A good read.And this sort of testing should be conducted on a case-specific basis for each design.
'best to crash inside a virtual reality,or safety of a wind tunnel.
Here's the link
https://www.rbracing-rsr.com/downloa...samwheeler.pdf