Defying Physics

[VertWolf]

Why does VR allow boats to proceed upwind at less than 45 degrees? This is physically impossible a there is no foward driving force. Also going downwind there will be a speed penalty for going to low but at 180 degrees you shoukd still make forward progress. Basically to obey physics the "polar" should be asymmetric 

[VICACAPOURSO]

http://toxcct.free.fr/polars/

[sauvageon]

Il y a 1 heure, VertWolf a dit :

This is physically impossible a there is no foward driving force.

Hello, you should consider studying more in depth aerodynamics, the driving force is the lifting force, named "portance" in french.

KR.

[VertWolf]

I understand that but with the drag on these monohulls they can only ever advance beyond 45 degrees using apparent wind  when foiling or possibly in 20-25 knot winds. The VR game allows boats to head at 28 degrees in 10 knots which in reality is impossible. Show me some real data not theoretical calculations that ignore drag.

[VertWolf]

3 hours ago, VICACAPOURSO said:

http://toxcct.free.fr/polars/

Exactly these does not remotely correspond with physical reality - show me some data for an Imoca 60 travelling 35 degrees upwind in 10 knots of wind or going zero knots when trying to go 180 degrees down wind in 10 knots

[Chupacabra]

6 hours ago, VertWolf said:

show me some data for an Imoca 60 travelling 35 degrees upwind in 10 knots of wind

www.www.sailingworld.com/how-to/how-to-sail-open-60/

Here you can find a real polar/butterfly graph. As you can see, in a TWS 12kts :

- TWA 035° : ~6 kts

- TWA 180° : ~4kts

So, it's not "physically impossible" to proceed at TWA < 45°. Besides, you still get a 50% better speed than at TWA 180°.

Note : that was 10 years ago. Considerable progress has been made.

7 hours ago, VertWolf said:

not theoretical calculations

Unfortunately, in a game, everything is theoretical. I wish I could feel the sea spray in my face, sitting on my sofa.

 

Edited December 29, 2020 by Chupacabra

[VertWolf]

3 hours ago, Chupacabra said:

www.www.sailingworld.com/how-to/how-to-sail-open-60/

Here you can find a real polar/butterfly graph. As you can see, in a TWS 12kts :

- TWA 035° : ~6 kts

- TWA 180° : ~4kts

So, it's not "physically impossible" to proceed at TWA < 45°. Besides, you still get a 50% better speed than at TWA 180°.

Note : that was 10 years ago. Considerable progress has been made.

Unfortunately, in a game, everything is theoretical. I wish I could feel the sea spray in my face, sitting on my sofa.

 

Thank you for posting this - it does support the case for the parameters used in the game.  I still think the extremes upwind and downwind are a bit unrealistic but probably compared to other things like the indestructibilty of the virtual boats it is not that big a deal