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Old 05-05-2013, 10:44 PM   #30 (permalink)
sendler
Master EcoModder
 
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Join Date: May 2011
Location: Syracuse, NY USA
Posts: 2,935

Honda CBR250R FI Single - '11 Honda CBR250R
90 day: 105.14 mpg (US)

2001 Honda Insight stick - '01 Honda Insight manual
90 day: 60.68 mpg (US)

2009 Honda Fit auto - '09 Honda Fit Auto
90 day: 38.51 mpg (US)

PCX153 - '13 Honda PCX150
90 day: 104.48 mpg (US)

2015 Yamaha R3 - '15 Yamaha R3
90 day: 80.94 mpg (US)

Ninja650 - '19 Kawasaki Ninja 650
90 day: 72.57 mpg (US)
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Quote:
Originally Posted by euromodder View Post
The aerodynamic term is flutter.
Happens to the best of 'm.
Round off top, bottom and front edges.
The bottom edge seems like a hard straight ridge.
Curving it to the inside will likely help - if not with the flutter, then with side-wind issues.
Good Eye. The top and bottom edges are too knife edged. Any slight bending will make a sharp bite into the air with no give over the top and bottom.
.
And the tail may get too narrow, too soon, to avoid separation. It might be better to use a wider tail angle and then truncate the length where you want it to keep from getting too long to park. 11 degrees per side for 22* total included? You will gain some useful luggage space by making it with a wider angle. Craig Vetter really did a nice job in designing his tail with generous rounding of the top and bottom.


Quote:
Originally Posted by euromodder View Post
There's a big gap between the windscreen and front fairing, towards the rear fairing.
That literally sucks,
You've probably seen windscreens and fairings with holes - they relieve pressure by letting some air into the "vacuum" - or spoilers atop windscreens.
My Honda CBR250R scoops air with the fairing and sends it up the inside of the wind screen past the top triple clamp. Many newer bikes such as the new Ninja650 feature a wind screen that is spaced off of the cowl to take air up the outside and the inside surfaces of the screen. It is also a nice design feature as it makes the screen easily adjustable for height.
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