Re: Quick Crosswind Calculation

On Jan 5, 6:52 am, Andy Hawkins <a...@xxxxxxxxxxxxx> wrote:
Hi,

In article <Xns9A1BC6D461736pissuprop...@xxxxxxxxxxxxxx>,
           Bertie the Bunyip<S...@xxxx> wrote:

Well, the clock face thing is more than enough in most cases. It's really
only for take off and landing, but even if you used it for tracking
enroute, it'd still be pretty close as a rough guide unless you were making
some long overwater leg or something. Even then, unless you were just
looking for some tiny little island...

We're back to where we came in, with me whining about the CAA (or perhaps
JAA) expecting you to calculate a magnetic heading to within 3 degrees on my
Nav exam! :)

There is no reason I can think of why you shouldnt be able to
calculate a magnetic heading within 3 degrees for an exam or for pre
flight planning. If they make the margin too slack people would get
the "right" answer without doing the calculation correctly. for
example variation might only be a couple of degrees, and you might be
able to forget about variation and still get the "correct" answer
( and then get yourself into trouble when you fly somewhere with 10
degrees of variation. I dont use a whiz wheel anymore ( I never did
use them in flight) , I do my pre flight planning wind calcs using
Excel and I could consistantly get within 1 degree and never more than
2 degrees. of the whizwheel calcs. In flight if I have to do a
diversion I usually just guess and then use ded reckoning. but I also
have a simple graph which gives me the drift angle for any wind -
track combination ( of course such a graph will only work at one TAS
so I have one for 90 for the C152 and one for 105kts for the C172 I
fly. Its much easier than rooting around with a whizwheel in flight.
(and it is easier to read with my aging eyes).
Terry.
.

Relevant Pages

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