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Hi Todd
Good questions!! I think you've pointed out the
guts of the thermalling dilemma.
I strongly recommend,at least in the early cross
country days, your tighter tighter tighter method of coring because most people
aren't turning steep enough. Once you find that tightening up is really only
increasing G and not reducing the circle much then you can move to the Reichman
method.
Phil
----- Original Message -----
Sent: Tuesday, September 19, 2006 6:45
AM
Subject: Re: [Aus-soaring]
Reichmann
Thank you
That makes more sense now. its just that i use a
technique where as you hit the strong lift you tighten up for about 3/4
of a circle and then go back to normal and that seems to work quite
well.
Todd
John Wharington <[EMAIL PROTECTED]>
wrote:
Hi
Todd,
Reichmann's technique as described in his book does indeed
work. I
think you may be misunderstanding it slightly because of what
might be a
translation error or oversimplified use of language.
To
be more formal (and correct), his technique is:
- 1) While the climb is
improving, flatten the circle
- 2) While the climb is deteriorating,
steepen the circle
The effect of 1 is to tend to head toward the
core, and the effect of 2
is to turn away from sink. Overall this results
in the center of the
spiral to gradually drift towards the
core.
So, you see the distinction is not "flatten out when at the
strongest
lift" but rather "flatten out as the lift is increasing"
etc.
In my PhD thesis I used this technique in an auto-thermalling
control
system for an unmanned aircraft and it works quite
well.
Hope this clarifies things.
Johnny
On Mon,
2006-09-18 at 22:56 +1000, Todd Sandercock wrote:
> hi all
>
> I was just reading the bible (Reichmann's "cross country soaring")
and
> came accross the thermaling technique described by reichmann.
the
> technique to me seams wrong. i'm guessing if it is, then it
has
> already been discused on this list but here it is
anyway:
> - as climb improves, flatten the circle (15-20
degrees)
> - as climb deteriorates, steepen the circle (50
degrees)
> - if climb remains constant, keep bank constant (25-30
degrees)
>
> in the book it describes keeping the same bank
angle for half a
> circle. so i have attached a couple of my drawings
of the situation.
> the first is of the method above. the second
picture is the opposite
> (as climb improves, steepen the circle. as
climb deteriorates, flatten
> the circle).
>
> these
drawings are my interpritations of the method so feel free to
> tell
me what im doing wrong.
>
> Todd
>
>
>
>
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