SF50 TOLD vs E6B Slide Rule

SF50 Takeoff and Landing Data helps Cirrus SF50 Vision pilots do their performance calculations. Simply launch the app, enter your weights, and the app will calculate how much runway you need to take off or land in your Vision Jet. SF50 TOLD supports both automatic and manual weather entry, custom safety factors, non-normal configurations (such as FLAPS 50 ICE or FLAPS 0), and runway contamination. All data comes from the SF50 G1 or G2+ Airplane Flight Manual* and is interpolated for current conditions. *This app has not been approved by the FAA or by Cirrus Aircraft as an official source of performance information. It is your responsibility to ensure that the performance data you use is accurate for current conditions. AFMs: Aircraft Serials with Cirrus Perspective Touch Avionics System and FL280 Maximum Operating Altitude P/N 31452-001 Revision A1 Aircraft Serials with Cirrus Perspective Touch+ Avionics System and FL310 Maximum Operating Altitude P/N 31452-002 Revision 4 Airplane Flight Manual Supplement for Updated Thrust Schedule P/N 31452-111 Revision 1

This simple circular slide rule works the way your aviator watch does. For rate/time calculations it can be faster than a calculator: set the rate once and read every distance and time straight off the dial, without typing anything. If you're an aviator who would rather use a slide rule than a calculator, try this app. It is much easier than trying to punch numbers on a watch calculator. We created it for the watch, but it works on the iPhone and iPad, too. Rotate the outer ring with your finger or with the Digital Crown. Let go mid-turn and it spins on and coasts to a stop. Slow down and the crown gets finer under your finger, so you can settle exactly where you meant to. A click marks each numbered graduation passing the rate index — feedback only, never a detente, so the dial will never nudge you onto a mark you did not choose. THE FACE Three concentric logarithmic scales, drawn to the proportions of the real thing. • The outer scale carries rate, distance, fuel and quantity, and it is the ring that turns. • The minutes scale sits inside it, fixed, with the rate index locked at twelve o'clock. The one pointer you read everything against never moves. • The hours scale runs 1:00 to 10:00 beneath, so elapsed time reads directly without converting from minutes. Complications on the watch face open it in one tap. Where you left the dial is where you find it, for a day. On iPhone and iPad it's the same instrument, larger, with room for numerals the watch has to leave off. WHAT IT DOESN'T DO: There's no keypad and no equals key — you read the answer off the dial, the way the instrument is meant to be used. No network: the app has no reason to reach the internet and never does. Nothing is collected, nothing is tracked, and nothing leaves your device. A reference and training tool. Not a certified flight computer — verify critical calculations independently.