Bob,
The thing is in front of you pivoted at the front
which is at the bottom from your point of view.
Stand a pencil on your desk in front of you.
Pivot it clockwise some degrees less than 90
about the point where it rests on the desk. Which direction is it pointing?
I used to fly with a little slip in thermals as a
result of some advice by George Moffat/ Klaus Holighaus/Dick Johnson.
Some flight tests have made me realise what you
are really doing here. I don't think it is good.
Mike
At 09:33 AM 1/17/2019, you wrote:
Good points Richard,
However I still find the use of the word "pointing" very ambiguous.Â
I suggest that "pointing" indicates a direction
radiating from the viewpoint.Â
This would have us discussing the forward
direction of the string, while it is more
common to consider the rearward direction of the
string..... ie it's trailing direction.Â
On Thu, 17 Jan. 2019, 10:18 am Richard Frawley
<<mailto:[email protected]>[email protected] wrote:
the string can be either pointing in to the
thermal centre or pointing out away from the core
there is some conjecture that with some aircraft
(I read that it was mainly older pre-1980 craft)
that with the string pointing to the outside,
they may be more efficient in the climb.
There are also some views that say that
polyhedral vs straight wings tend to set up a
balance that has the string pointing out.
I have not yet seen any empiric data or detailed
theory that speaks to these suppositions, I expect it exists somewhere tho.
More questions and less answers still
..
Richard Frawley
<mailto:[email protected]>[email protected]
We do not inherit the earth from ourÂ
ancestors, we borrow it from our children
On 17 Jan 2019, at 10:12 am, Bob Dircks
<<mailto:[email protected]>[email protected]> wrote:
Mike,
In your original question,
Part b,
By "pointing" I presume you mean "trailing" ?
To me, in this case "pointing" could be the
direction of the forward end of the string.Â
On Thu, 17 Jan. 2019, 9:54 am Mike Borgelt
<<mailto:[email protected]>[email protected] wrote:
So how about answering the questions?
Mike
At 08:51 AM 1/17/2019, you wrote:
and what is the expected differential
(gain/loss) with say a 10degree slip
indication variation, given all the other factors that determine climb rate.
This might b able to be worked out
mathematically given the airflows angle on the
wing and fuselage drags differences
I suspect that are several aerodynamic factors
would have to be considered, especially given the the thermal core is dynamic.
A question for modern designers perhaps,
especially when all aviation design is a trade off
Richard Frawley
<mailto:[email protected]>[email protected]
We do not inherit the earth from our
ancestors, we borrow it from our children
On 17 Jan 2019, at 9:43 am, Mike Borgelt
<<mailto:[email protected]>
[email protected]> wrote:
At 07:36 AM 1/17/2019, you wrote:
Perhaps the more important question is how
to you tell if one technique is better than another. What is a useful baseline?
Climbing better than the other gliders is the
test but what if everybody is using the same less than optimum technique?
Mike
On 17 Jan 2019, at 7:16 am, Mike Borgelt
<<mailto:[email protected]>
[email protected]> wrote:
When circling in a thermal, do you
a) keep the string centered
b) fly with it pointing to the outside of the turn
c) why?
Your technique may not be doing what you think it is.
Mike
Borgelt Instruments - design & manufacture
of quality soaring instrumentation since 1978
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tel:Â Â 07 4635 5784Â Â Â Â Â overseas: int+61-7-4635 5784
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tel:Â Â 07 4635 5784Â Â Â Â Â overseas: int+61-7-4635 5784
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tel: 07 4635 5784 overseas: int+61-7-4635 5784
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