On Sat, 14 Oct 2006 10:47:00 +0100, "Chris"
wrote:


"d&tm" wrote in message
...

wrote in message
...
Ah... Well... I just through some random numbers in there... Of course,
one
would not try and pull a 57G turn as cool as it sounds...

Thanks for the lesson! I learned something new today...


The calculator is correct by my reckoning. 80mph and 89 degree bank
gives 8 ft radius turning circle which is correct in theory. it sounds
ridiculous but really the 89 degree angle of bank is what is ridiculous
.
such a turn if possible would pull 57 g. the calculation is not that
difficult. radius= v squared / g tan ( bank angle)
terry

I should add that this calulation assumes all the lift is coming from the
wing , but that theory would imply that an aircraft cant hold altitude in
a
90 degree bank, and of course we have all seen aerobatic aircraft do this.
For this to occur the lift must be coming from the fuselage of the
aircraft
and so the equation will not be strictly correct. But for the type of
turns
that mere mortals like me will do I think it tells the story. I have
heard
guys on this group regulary mention 60 degree or 2 g turns, but in my
training steep turns were 45 degrees maximum.
terry

In the UK steep turn are defined as 60 degree turns and that is what we are
trained to do.
I remember the first time I was flying in the US and as part of the checkout
this young instructor asked me to do a steep turn. He made some strange
noises - I don't think he had done 60 degrees before.

I find them easier than 45 degree turns

When I first learned my steep turns, they were 60 degrees. Then a few
years ago when I was receiving a flight review, the CFI told me that
we now do them at 45 degrees, apparently a change from the FAA. So now
we do 45 degree steep turns.

RK Henry