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Glide ratio, was Re: Best glide speed RV6A

 
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fly4grins(at)gmail.com
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PostPosted: Tue May 26, 2015 6:20 am    Post subject: Glide ratio, was Re: Best glide speed RV6A Reply with quote

Hi Guys- 
I took a look at the cited article and noticed a technical issue.  Aside from some cross-border, or perhaps more likely cross-bureaucracy diction issues, the article implies that glide ratio varies with aircraft weight.  As I'm sure most will recall, glide ratio is a function of form and speed.  Changing the aircraft weight will result in a corresponding change in the speed at which best L/D occurs, but not the value of that ratio (not to any practical, or perhaps even measurable extent).
If interested, one can take a look at the Fed's Glider Handbook, Aerodynamics of Flight chapter, Glide Ratio section for a good refresher including a graphical explanation of the effect.
https://www.faa.gov/regulations_policies/handbooks_manuals/aircraft/glider_handbook/media/gfh_ch03.pdf
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