I know there's an ongoing thread about constant chord (HB) vs tapered wing "floating", approach speeds etc. This is related but a bit different so I started a new thread just to ask a specific series of questions around best glide speed. I understand weight adjustments so just sticking with max gross numbers for this discussion, the POH for my PA28R-200, 1971 Arrow, describes Vx - 91 mph (gear up); Vy - 95 mph (gear up); Best Glide - 105 mph.
My question is why is the best glide speed apparently out of the norm? "For most airplanes" the best glide is between Vx and Vy (see: https://www.faa.gov/news/safety_briefing/2018/media/SE_Topic_18-05.pdf). Checking out a couple other PA28 manuals with tapered wings (PA28-161 and PA28R-201) this seems to be the case -- best glide being in the range of 85-91 mph while Vx/Vy is 76-90/87-103 mph. And for an older (HB) PA28-180 I found best glide 82 mph with Vx/Vy 74/85 mph - again following the norm.
So what's up with my Arrow? Anyone with a comparable Arrow understand these speeds? Am I reading the POH (which wasn't extremely detailed from '71) correctly? Is the POH correct? No, I haven't yet done my own in-flight determinations. Perhaps foolishly I've accepted the book values up to now.
My question is why is the best glide speed apparently out of the norm? "For most airplanes" the best glide is between Vx and Vy (see: https://www.faa.gov/news/safety_briefing/2018/media/SE_Topic_18-05.pdf). Checking out a couple other PA28 manuals with tapered wings (PA28-161 and PA28R-201) this seems to be the case -- best glide being in the range of 85-91 mph while Vx/Vy is 76-90/87-103 mph. And for an older (HB) PA28-180 I found best glide 82 mph with Vx/Vy 74/85 mph - again following the norm.
So what's up with my Arrow? Anyone with a comparable Arrow understand these speeds? Am I reading the POH (which wasn't extremely detailed from '71) correctly? Is the POH correct? No, I haven't yet done my own in-flight determinations. Perhaps foolishly I've accepted the book values up to now.
