Good morning allYou might want to refer to "Advanced Soaring Made Easy" pages 194 and 195.CheersBernard
Sent from my Samsung Galaxy smartphone. -------- Original message --------From: Bob Dircks <dircks....@gmail.com> Date: 17/01/2019 10:03 (GMT+09:30) To: "Discussion of issues relating to Soaring in Australia." <aus-soaring@lists.base64.com.au> 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 <rjfraw...@gmail.com 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 frawleyrjfraw...@gmail.com 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 <dircks....@gmail.com> 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 <mborg...@borgeltinstruments.com 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 rjfraw...@gmail.com 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 < mborg...@borgeltinstruments.com> 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 < mborg...@borgeltinstruments.com> 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 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 _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.base64.com.au http://lists.base64.com.au/listinfo/aus-soaring _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.base64.com.au http://lists.base64.com.au/listinfo/aus-soaring Borgelt Instruments - design & manufacture of 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 _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.base64.com.au http://lists.base64.com.au/listinfo/aus-soaring _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.base64.com.au http://lists.base64.com.au/listinfo/aus-soaring Borgelt Instruments - design & manufacture of 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 _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.base64.com.au http://lists.base64.com.au/listinfo/aus-soaring _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.base64.com.au http://lists.base64.com.au/listinfo/aus-soaring _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.base64.com.au http://lists.base64.com.au/listinfo/aus-soaring
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