Thanks, Glenn.
Mike
At 02:06 PM 1/17/2019, you wrote:
Hi Mike
I usually fly with a bit of top rudder in
thetmals i.e. string pointing towards uppermost
wing. It prevents being blown out of the lift in
gusty thermals and is useful when down low scratching away.
Cheers
Glenn
Sent from my SAMSUNG Galaxy Note5 on the Telstra Mobile Network
-------- Original message --------
From: Mike Borgelt <[email protected]>
Date: 17/1/19 10:42 am (GMT+10:00)
To: "Discussion of issues relating to Soaring in
Australia." <[email protected]>
Subject: Re: [Aus-soaring] slip in thermals?
5 replies and nobody wants to say what they personally try to do or why.
Never mind.
Mike
At 09:39 AM 1/17/2019, you wrote:
Good morning all
You might want to refer to "Advanced Soaring Made Easy" pages 194 and 195.
Cheers
Bernard
Sent from my Samsung Galaxy smartphone.
-------- Original message --------
From: Bob Dircks <[email protected]>
Date: 17/01/2019 10:03 (GMT+09:30)
To: "Discussion of issues relating to Soaring
in Australia." <[email protected]>
Subject: Re: [Aus-soaring] slip in thermals?
Good points Richard,
However I still find the use of the word "pointing" very ambiguous.
I suggest that "pointing" indicates a direction
radiating from the viewpoint.
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.
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 stillÂ
..
<
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 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.
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
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tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
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<http://www.borgeltinstruments.com/>www.borgeltinstruments.com
tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
P O Box 4607, Toowoomba East, QLD 4350, Australia
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quality soaring instrumentation since 1978
www.borgeltinstruments.com
tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
P O Box 4607, Toowoomba East, QLD 4350, Australia
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quality soaring instrumentation since 1978
www.borgeltinstruments.com
tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
P O Box 4607, Toowoomba East, QLD 4350, Australia
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