Joey,
Discussions with Joe Brownlee about 70 X 0.020. Safe till 167 MPH (169 with 60 X 0.022 lines.
Northwest uses 70 X 0.018 with lighter maximum weight airplanes.
New Zealand uses 65.2 X .020
Rough estimate of speeds from memory (don,t have my notes)
60 X 0.022 -153 mph
70 X 0.020 -150
70 X 0.018 -157
65 X 0.020 -154.5
NASS uses the shortest Sport Jet lines in the world.
Dave Dawson, who has entered S-J at Whittier (Jim Rhoades proxy) and Bruce Ferrell of Denver (Greg Settle proxy) who are nor members of this forum both told be they would fly their own Sport-Jets on longer lines. I fly mine with the Dyna-Jet, but my Bailey record setter is still too fast for me on short lines.
Why exclude flyers to keep the short lines? Speed Flyers are in short supply as it is.
Will Stewart