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FJR Motorcycle Forums
Technical & Mechanical Problems
Weird handling after GIVI top box
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<blockquote data-quote="Uncle Hud" data-source="post: 1178874" data-attributes="member: 29492"><p>From a physics standpoint, this certainly sounds reasonable. As the airstreams from the windshield converge behind the pilot, they would create buffeting at the front edge of the top box -- which would explain the wiggles.</p><p></p><p>Under <strong>900gc's</strong> hypothesis, there would be five ways to mitigate:</p><p></p><p>(1) extend the convergence zone further aft (passenger, pillion bag, windshield adjustments, side wing-extensions for the windshield, and the like;</p><p></p><p>(2) push the 'leading edge' of the top box forward (passenger or pillion bag serve that purpose, too, as would some 'architectural' treatment to the top box);</p><p></p><p>(3) adjust speed to find the sweet spot where the convergence zone moves forward or aft of the top box;</p><p></p><p>(4) move the convergence zone forward (reduce the windshield size or eliminate the windshield; thinner pilot!); and</p><p></p><p>(5) remove the top box. (Hey, that <u>would</u> mitigate the wiggle.)</p><p></p><p>Since the wiggle is mostly side-to-side, I'd expect port-and-starboard airflow convergence is the primary cause, but over-the-top airflow may be a significant contributor.</p><p></p><p>Just thinking things through ...</p><p></p><p>Respectfully submitted,</p><p></p><p>Uncle Hud</p></blockquote><p></p>
[QUOTE="Uncle Hud, post: 1178874, member: 29492"] From a physics standpoint, this certainly sounds reasonable. As the airstreams from the windshield converge behind the pilot, they would create buffeting at the front edge of the top box -- which would explain the wiggles. Under [B]900gc's[/B] hypothesis, there would be five ways to mitigate: (1) extend the convergence zone further aft (passenger, pillion bag, windshield adjustments, side wing-extensions for the windshield, and the like; (2) push the 'leading edge' of the top box forward (passenger or pillion bag serve that purpose, too, as would some 'architectural' treatment to the top box); (3) adjust speed to find the sweet spot where the convergence zone moves forward or aft of the top box; (4) move the convergence zone forward (reduce the windshield size or eliminate the windshield; thinner pilot!); and (5) remove the top box. (Hey, that [U]would[/U] mitigate the wiggle.) Since the wiggle is mostly side-to-side, I'd expect port-and-starboard airflow convergence is the primary cause, but over-the-top airflow may be a significant contributor. Just thinking things through ... Respectfully submitted, Uncle Hud [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Weird handling after GIVI top box
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