AFMatic

AFMatic has been created specifically to provide preflight airplane flight manual performance for Gulfstream aircraft operators.

Developed by a former Gulfstream aerodynamic performance engineer with years of experience in analyzing Gulfstream aircraft performance and creating flight manuals for Gulfstream aircraft, AFMatic provides the solution you've been seeking for your takeoff and landing performance computation needs.
And with new features being added all the time, AFMatic is the Swiss Army Knife of tools for Gulfstream pilots.