Ticket #250 (new enhancement)

Opened 5 years ago

Last modified 5 years ago

Altitude check/display at SS cylinder crossing

Reported by: oyvellef Owned by: joerg
Priority: major Milestone:
Component: FsComp Version: 1.2.14
Keywords: altitude Cc: audune, wesleyianhill@…


(Related to Ticket #161)

We need a check and display of altitude for SS cylinder crossing. We have used altitude limits on the SS cylinder crossing as one mechanism to remove the incentive for pilots to climb into clouds to gain an unfair and unsafe advantage on the start of the task.

This feature is needed for the HG Worlds in January 2013, as there will be altitude limits both on start and in regards to airspace. Airspace checks are implemented, but the SS check would have to be manual with the current version of FS.

Implementation; I would suggest an extra field in the task setup, "SS Cylinder crossing altitude limit" Any other altitude limits could be enforced through the airspace checks, but in my mind the cylinder crossing is a different mechanism than airspace.

If the pilots cross too high an alarm should be raised in the GUI, (Hilighting the pilot in red?) and probably suggest a penalty based on % or points per meter.

FS should only alarm on the crossing that counts as the pilot's start, as pilots may cross the cylinder many times above the limit while waiting for the startgate.

I would also suggest the start altitude limit is published in the score-report, and the calculated individual altitude per pilot with the points.

The altitude could be interpolated from the two tracklog points before and after, or maybe just the first point after the crossing.

Change History

comment:1 follow-up: ↓ 2 Changed 5 years ago by joerg

Could a work-around be to define an additional air space, same as the start cylinder, with a maximum altitude as defined by the start altitude limit given at the task briefing?

comment:2 in reply to: ↑ 1 Changed 5 years ago by oyvellef

Replying to joerg:

Could a work-around be to define an additional air space, same as the start cylinder, with a maximum altitude as defined by the start altitude limit given at the task briefing?

Airspace is usually an area defined by outer boundaries and a height, a circle or area defined by points. Using Airspace as implemented in FS today will give alarms if pilots are above the limit inside the cylinder, not only when they cross the line, so it would not help the scorer.

comment:3 Changed 5 years ago by joerg

So you're saying that it would be OK for a pilot to fly above the limit before the air start, but not if at the time when he starts? How good is energy retention inHang Gliders? Probably not quite as good as sail planes, but still this sounds like a recipe for disaster to me: Everybody gets as high as possible, regardless of clouds, to dive down at maximum speed over the start line, and then pull up again to convert that speed back into altitude...

comment:4 Changed 5 years ago by oyvellef

It's would not be a big change as we already typically glide out at around 70-90 km/h depending on the day, pilots are used to the race starts with many gliders at high speeds.

The retention is not that good that you would gain much from diving, the drag start to increase significantly at those speeds, and the small height advantage may just as easily be lost manouvering at high speeds.

Having a limit over the whole SS cyl would force all pilots to stay at a fixed altitude in lift, watching their instruments closely. In my opinion that is a lot worse, and would feel very unsafe and difficult, with many pilots doing unpredictable manouvers to stay below the limit.

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