Weather_routing has a lot of nooks and crannies I have not explored and do not fullly understand. However it is becoming apparent we need to get a handle on Polars to run some tests. ... to that end.
Tracker above is FS#1117.
I've been messing about with the settings under Configuration > Edit "Boat" Edit button. There aree 5 tabs:
Plot Details, Polar File, VMG, Hull
, Sail Plan, Statistics
Each of these tabs is packed with settings and information.
Plot Details Tab
- has file save, save as, open & close (it would be helpful if the path was remembered). Selection of boat, apparent & true. Wind
Knots adjustment, and Signif Wave Ht & Wave period. When you set these settings and Save as, then bring it back in with Open, the wind
knots do not change, just the Boat, Apparent, True.
I a still not quite sure what these XML files are supposed to do, they have this form:
BoatCharacteristics () Boatcharacteristics
BostDrag () BoatDrag
Plan () Plan
Polar File Tab
When I bring is a well formatted polar from qtVlm called boat_Mono650.csv It loads fine and the polar seems to be ok. When I save it out to a new name and then Open that file, all the polar curves are gone. This is a bug.
I don't understand what Optimize Tacking does. It seems to affect the areas directly upwind in unrealistic ways.
Type of hull - disp tons lwl ft.
These settings can be saved I think.
Drag frictional wake then recompute Info
The info tab is helpful.
Sail Plan Tab
We could use another Info tab here explaining.
I think Eta is some factor for sailing efficiency, no boat is 100% efficient, it is a way of matching reality (seaweed, barnacles
, seaway, waves, sail set, etc. to the polar) When Eta goes down the speed goes up.
There is also a Max point angle setting for the boat, and New and Edit buttons. I belive Ocpn bombs when I hit these two buttons. I have sent several crash messages so far.
Has beam, loa
feet with resulting hull speed
, comfort, etc. When the window is closed the Beam number is NOT saved and always has to be redone!! This is a bit of a pain.
VPP Polars from Boat data VS Opening a Polar File.
When we open a polar file, should we NOT touch anything else or the file is changed? Should we stay out of the VPP tabs so things are not changed and rewrittten? I think this needs to become clearer to the user and perhaps structurally built into the program.
One side is opening a polar, the other side is calc polar from the boat data.