Polars suggestion
Post by iconPost by toxcct | 2017-03-13 | 11:32:51

Hi Cvetan,

Here some little improvements I'd find useful if you could implement them.

It would be nice to have a polar chart page, unrelated to a given/selected race, with the a dropdown field to select a boat type charts (Imoca, Type40, etc...).
That way, we could use the polars even though you didn't make a full race setup (that particularly useful for the VMG, which I don't have on my VR dashbord because I sail without options).

Beside that, it would be nice to have the following improvements on the existing polar graph :
- draw a section line showing the exact angle we're inspecting with the hovering mouse (like VR polars for instance)
- below the optimums, could we have a display of the higher speed angle ?

Small question as an end. How do you calculate the VMG (math expected ^^) ? How comes that it equals almost 0 kts on higher boat speed ?

Thanks already to read and show interest for my post :)
And thanks obviously for your so nice work on your router.

commenticon 2 Comments
Post by iconPost by Alexandria | 2017-03-13 | 22:22:48
Hi!


I have just read your post and I think I can help.

We have VMG = V x cos (TWA).

The sign of the VMG will depend on the cos (TWA) sign.

If the TWA is equal or greater than zero, but not equal or greater than 90 degrees, cos (TWA) will be positive -- you are going into the wind.

If the TWA is greater than 90 degrees and not greater than 180 degrees, cos (TWA) will be negative -- you are sailing away from the wind.

If TWA = 90, cos (TWA) = zero.
Post by iconPost by toxcct | 2017-03-18 | 16:16:54
Dear Cvetan,

I know you've had a busy week, and you took time to launch the new mediterannean race this morning, but if you could take a few minutes to answer this thread, it would be my pleasure ;)

Thanks.
toxcct
border
Topics list
Posts
border
4
border
border
26
border
border
53
border
border
42
border
border
12
border
border
5
border
border
17
border
border
2
border
border
4
border
border
3
border
border
1
border
border
35
border
border
3
border
border
2
border
border
11
border
border
4
border
border
15
border
border
8
border
border
5
border
border
11
border
border
5
border
border
Copyright 2009 by ZEZO.ORG. All Rights Reserved.