| Subject |
Re: Confused by maths |
| Thread |
Number 2 of 4 in thread |
| Author |
John Bridge |
| Posted |
03-Sep-09 09:48:00 |
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Hi Tim,
You have been making my head hurt :-)
I would not necessarily expect the shape factor to be the same for FAI and barrel sectors. That said, I had a closer look at the maths and found that there *was* an error which, after some effort, has now been fixed. The upshot is that your task turns out to be a 28% triangle whichever sector type you use.
Whether you use TIB or TB1 as a start/finish point is irrelevant as far as the shape factor goes - that is determined by the triangle DIS-PIC-NOE-DIS.
My version of SeeYou does not modify distances from FAI sectors to barrel sectors - it always seems to use FAI sector distances, so I still reckon the
Ladder calculator is correct (...unless you tell me otherwise...).
Right - got to get back to some real work!
rgds
John
## On 01-Sep-09 11:34:00 Tim Davies wrote:
John
Our club 100ish km triangle is causing confusion as it flips from being a 28% triangle to not depending on the turning point style used.
TIB - DIS - PIC - NOE - TIB or reversed
Gives with FAI sectors:
28.2%/37.6% Triangle
Basis FAI 28% - Shape 1.080
And with barrels:
27.8%/37.3% Triangle
Basis FAI 25/45 - Shape 1.050
I'm sure your maths is right - is this what you'd expect to happen and is it as a result of the start on leg?
If you move the start/finish to TB1 it is interesting is that SeeYou give both variants as 28% triangles but your calculator doesn't !
Cheers
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