- Wed May 24, 2017 11:41 am
#398520
Jason wrote:I was inside an extremely tight bullet thermal with cascading edges. In other words the air was neither liner nor was it level. The so-call math ignores the reality of the conditions that result in such a climb.NMERider wrote:Jason wrote:Isn't >45° just a little bit beyond most relevant soaring conditions?
thats only true up to 45 degrees, once you exceed 45 degrees the diffrence in tip speeds starts to decrease, by the time you get to 70-80 degrees the difference is nearly 0.NMERider wrote: The tightest measure climbing turn I have ever done in my T2C 144 were 58' in diameter at an estimated 70° bank angle and at ~44mph. Sadly, the shorter projected wing spans and slower thermalling speeds of modern comp PGs allows then to get better established in most cores and they climb right through me as if I were pole-sitting. But I live and fly in a high pressure environment which makes for some very skinny thermals.also your math doesn't add up
58 foot diameter=29 foot radius, 44mph=65 fps
a=v^2/r, for a lateral accelration of 4.5 gees
70 degrees of bank produces 2.92 felt gees and 2.75 lateral gees.
for the math to work you'd have to be around 78 degrees- for a felt gee load of 4.8 gees
i don't have the video of it now, but i remember flying the G103 and i obviously wasn't at 90, but it sure felt that way, maybe 70-75, with the stick fully back in my lap and going up with the vario pegged.
sometimes the steeper you bank the faster you climb