"Gary Drescher" wrote in message . ..
: NYC's East River is about 2000' wide. So when you approach the north
: endpoint of the VFR corridor there, you need to make a U turn with a 1000'
: radius (or less if you're not right next to the eastern shore when you start
: the turn).
:
: Suppose you're afraid to fly too slowly because you don't want to stall
: during the turn, so you cruise up the river at 90 knots. Suppose you're
: afraid to bank too steeply because you don't want to stall during the turn,
: so you use just a 30-degree bank.
:
: Oops: your turning radius is about 1200'.
:
: Using the East River VFR corridor requires planning the turn
: carefully--especially since you need to leave an extra margin in case you
: have to dodge high-density traffic there.
:
: --Gary
:
:

Found this link:
http://www.csgnetwork.com/aircraftturninfocalc.html
(Some other interesting calculators there also)