by Bomber, Western Soarers HG Club
I have spend some time crunching some Speed 2 Fly numbers and have come up with the some general conclusions that maybe of interest.
1a. Fly best glide for nil wind to tail wind when lift is below 1.5 m/s up average – outcome: you will achieve 90% or better of the Cross Country speed of someone using 100% S2F. No increase in sink rate.
OR if your more agressive…
1b. Fly 30% Speed 2 Fly (eg if you expect 1.5 m/s up next, then set speed ring to 30% approx 0.5 m/s up) for nil wind to tail wind when lift is below 1.5 m/s up average – oucome: you will achieve 96% or better of the Cross Country speed of someone using 100% S2F. Increase of between 5% to 16% in your sink rate.
2a. Fly 30% Speed 2 Fly (eg if you expect 3 m/s up next, then set speed ring to 30% approx 1 m/s up) for nil wind to tail wind when lift is 1.5 m/s up to 3.5 m/s up average – oucome: you will achieve 92% or better of the Cross Country speed of someone using 100% S2F. Increase of between 22% to 43% in your sink rate.
OR if your really conservative…
2b. Fly best glide for nil wind to tail wind when lift is 1.5 m/s up to 3.5 m/s up average – outcome: you will achieve 78% or better of the Cross Country speed of someone using 100% S2F. No increase in sink rate.
3a. Fly 50% Speed 2 Fly (eg if you expect 0.5 m/s up next, then set speed ring to 50% approx 2.5 m/s up) for nil wind to tail wind when lift is 3.5 m/s up to 5 m/s up average – oucome: you will achieve 96% or better of the Cross Country speed of someone using 100% S2F. Increase of between 92% to 121% in your sink rate.
OR if your more conservative
3b. Fly 30% Speed 2 Fly (eg if you expect 1000 up next, then set speed ring to 30% approx 300 up) for nil wind to tail wind when lift is 3.5 m/s up to 5 m/s up average – oucome: you will achieve 90% or better of the Cross Country speed of someone using 100% S2F. Increase of between 50% to 65% in your sink rate.
OR if your super conservative.
3c. Fly best glide for nil wind to tail wind when lift is 3.5 m/s up to 5 m/s up average – outcome: you will achieve 72% or better of the Cross Country speed of someone using 100% S2F. No increase in sink rate.