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On Tue, 09 Sep 2003 12:22:27 -0400, Todd Pattist wrote:
Kevin Horton wrote: Imagine that you have two aircraft that weigh the same, one with a high wing loading, and one with a low wing loading, flying the same speed through the same up-drafts and down-drafts. The angle of attack changes instantly as the aircraft penetrates into the up-drafts and down-drafts. Both aircraft are going the same speed, so the amount that the angle of attack changes is the same. But, the aircraft that has a lower wing loading will experience more g in the bumps, Right. because the bigger wing will have a larger change in the amount of lift developed due to that change in angle of attack. This assumes a larger wing on one plane (and presumably about the same weight for both aircraft). That's possible, but it's also possible that we're talking about two identical aircraft (same size wing on both) and one is just carrying more weight. In that case, the "change in amount of lift" would be roughly the same for both since the coefficient of lift changes roughly linearly with AOA. You'd still get less g-load in the higher wing loaded aircraft simply because the heavier aircraft accelerates more slowly when the same amount of lift is applied. Agreed. My explanation only covered one case, but the logic and result (higher wing loading = lower g excursions in turbulence) are valid over a wide range of scenarios. The premise falls apart a bit if the aircraft with lower wing loading also has a very low aspect ratio (e.g. 60 deg delta wing), as the lift curve slope is lower on the lower aspect ratio wing. Lower lift curve slope = lower increase in lift for the same change in angle of attack. While the effect of very low aspect ratio on ride quality in turbulence is technically interesting, it probably isn't relevant to many homebuilt aircraft. Todd Pattist (Remove DONTSPAMME from address to email reply.) ___ Make a commitment to learn something from every flight. Share what you learn. -- Kevin Horton RV-8 (finishing kit) Ottawa, Canada http://go.phpwebhosting.com/~khorton/rv8/ |
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