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Ticket #216 (assigned enhancement)
Configuration: Add Empty Weight / wing area polar config screen
| Reported by: | luke | Owned by: | hjr |
|---|---|---|---|
| Priority: | normal | Milestone: | XCSoar Manual |
| Component: | Configuration | Version: | 6.1 |
| Keywords: | polar, manual | Cc: | Turbo |
Description
When using the custom (winpilot) polar file option the wing loading is not calculated (or at least displayed). By adding a dialogue to enter the wing area the calculations can be more accurate. If no wing area is added the current calculations can be used.
Change History
comment:1 Changed 2 years ago by Turbo
- Summary changed from Add wing area dialogue to custom polar file config to Configuration: Add wing area dialogue to custom polar file config
- Milestone set to Release 6.0 Alpha
comment:2 follow-up: ↓ 6 Changed 22 months ago by Turbo
- Milestone changed from XCSoar 6.0 to XCSoar 6.1 (wishlist)
comment:3 Changed 16 months ago by RobD
- Keywords polar added
- Owner changed from scottp@… to RobD
- Version set to 6.0a
- Status changed from new to assigned
- Summary changed from Configuration: Add wing area dialogue to custom polar file config to Configuration: Add Empty Weight / wing area polar config screen
The issue is there is no way to set the Dry Weight of the ship, so the polar calculations are all based on the "Factory Weight" for built-in polars, or for Winpilot.plr file, this can be modified.
So, if a ship is significantly lighter or heavier than the factory weight, or the pilot is heavier or lighter than average, the glide calculations a MacCready? > 0 will be off.
Not sure why we would need the wing area though.
Scott, I've reassigned this to me.
comment:4 Changed 16 months ago by Turbo
The wing area can be used to display the wing loading in kg/m2 or whatever the unit in the US might be. For comparing club class gliders with different wing areas for example it is usefull to compare the wing loading instead of the weight.
comment:5 Changed 15 months ago by RobD
Design notes:
1) display wing loading on the Flight Setup screen (as ballast dumps, wingloading decreases visually)
2) Display wing loading (and wing area?) on Polar configuration screen.
3) Allow editing empty weight (and wing area?) in the Polar config screen.
4) if the Polar is changed, it would reset the empty weight to the default for the newly selected polar (either polar file or built-in polar).
5) If empty weight (or wing loading) is modified, we would create a new .plr file to save the new information. e.g. "LS3 Custom.plr."
6) need to consider risk of overwriting existing .plr files.
7) explore other parameters on Polar config screen (e.g. v rough air -- how is this used?)
comment:6 in reply to: ↑ 2 Changed 14 months ago by luke
Replying to Turbo:
Hi Turbo,
I don't think the wing area is part of the file, at least not that i can see...
eg:
*SZD-51-1 WinPilot? POLAR file: MassDryGross?[kg], MaxWaterBallast?[liters], Speed1[km/h], Sink1[m/s], Speed2, Sink2, Speed3, Sink3
225, 0, 70.0, -0.576, 130.0, -1.600, 160.0, -2.665
*LS-4a WinPilot? POLAR file: MassDryGross?[kg], MaxWaterBallast?[liters], Speed1[km/h], Sink1[m/s], Speed2, Sink2, Speed3, Sink3
361, 121, 114.87, -0.8, 172.3, -2.33, 210.59, -4.5
*Cobra WinPilot? POLAR file: MassDryGross?[kg], MaxWaterBallast?[liters], Speed1[km/h], Sink1[m/s], Speed2, Sink2, Speed3, Sink3
350, 30, 70.8, -0.60, 94.5, -0.69, 148.1, -1.83
comment:9 Changed 12 months ago by Turbo
- Status changed from assigned to closed
- Resolution set to fixed
- Milestone changed from XCSoar Wishlist to XCSoar 6.1
comment:10 Changed 9 months ago by hjr
- Keywords polar, manual added; polar removed
- Status changed from closed to reopened
- Version changed from 6.0a to 6.1
- Resolution fixed deleted
- Milestone changed from XCSoar 6.1 to XCSoar 6.1 Manual
comment:11 Changed 9 months ago by hjr
- Cc Turbo added
- Owner Turbo deleted
- Status changed from reopened to assigned
Describe new polar config page.
Hi luke,
as far as I know the wing area is specified in the winpilot polar file. Why would you want to override it? Or am I getting you wrong?!
Turbo