Crabwise: E6B Flight Computer
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About this app
Crabwise is an offline E6B flight computer built for student and private pilots: the six calculations you learn on paper, with type large enough to read at a glance.
WIND & GROUND SPEED
Solve the wind triangle both directions: find your heading and ground speed, or work backward from heading, track, and ground speed to find the wind.
PRESSURE & DENSITY ALTITUDE
See the classroom rule of thumb and the exact ICAO Doc 7488 answer side by side, so you know how much margin you actually have.
TRUE AIRSPEED & MACH
The quick 2%-per-1000-ft approximation and the exact compressible calculation, together.
FUEL / TIME / DISTANCE
Solve for any one of the three from the other two.
CROSSWIND
Headwind and crosswind components for any runway and wind.
CONVERSIONS
Seven unit families: distance, speed, altitude, temperature, pressure, weight, volume.
CRABWISE PRO, ONE-TIME PURCHASE ($9.99)
- Aircraft profiles: save cruise speed, fuel burn, usable fuel, empty weight and arm, and limits for every aircraft you fly.
- Leg planner: chain legs from true course to compass heading, with running totals for time and fuel.
- Weight & balance: plot your loading against your aircraft's envelope, checked live as you type.
- History & export: save any result and export it as text or CSV.
Free forever: all six calculators, every unit, every language, extra-large type. No ads, ever. No trial timer, no subscription.
For training and planning cross-checks. Always verify against your aircraft flight manual and official sources. Not for primary navigation.
No account. No ads. No tracking. Works offline.
Available in English, Spanish, and Polish.
WIND & GROUND SPEED
Solve the wind triangle both directions: find your heading and ground speed, or work backward from heading, track, and ground speed to find the wind.
PRESSURE & DENSITY ALTITUDE
See the classroom rule of thumb and the exact ICAO Doc 7488 answer side by side, so you know how much margin you actually have.
TRUE AIRSPEED & MACH
The quick 2%-per-1000-ft approximation and the exact compressible calculation, together.
FUEL / TIME / DISTANCE
Solve for any one of the three from the other two.
CROSSWIND
Headwind and crosswind components for any runway and wind.
CONVERSIONS
Seven unit families: distance, speed, altitude, temperature, pressure, weight, volume.
CRABWISE PRO, ONE-TIME PURCHASE ($9.99)
- Aircraft profiles: save cruise speed, fuel burn, usable fuel, empty weight and arm, and limits for every aircraft you fly.
- Leg planner: chain legs from true course to compass heading, with running totals for time and fuel.
- Weight & balance: plot your loading against your aircraft's envelope, checked live as you type.
- History & export: save any result and export it as text or CSV.
Free forever: all six calculators, every unit, every language, extra-large type. No ads, ever. No trial timer, no subscription.
For training and planning cross-checks. Always verify against your aircraft flight manual and official sources. Not for primary navigation.
No account. No ads. No tracking. Works offline.
Available in English, Spanish, and Polish.
E6B flight computer: wind, density altitude, crosswind, weight and balance.
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What’s new
First release.
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About the developer
RPM MOTORSPORTS LLC
sales@syntheticm2m.com
2759 Delk Rd SE Ste 1199
Marietta, GA 30067-8885
United States
+1 404-934-0766
