Crabwise · Library
Practical Crabwise guides
Original source-linked workflows and worked examples. Read the assumptions before transferring a result.
- How do you calculate a route time when each leg has a different ground speed?
- Why is the mean of two ground speeds not necessarily the route average?
- How do you keep trip fuel, taxi fuel and a chosen reserve separate?
- How do you keep decimal hours separate from hours and minutes?
- How can a timed distance check be used to calculate observed ground speed?
- How can elapsed time be converted into distance travelled and distance remaining?
- How can a fuel-and-time log be converted into an average flow?
- Why can the same endurance produce different ranges?
- What does an assumed fuel density change in a mass conversion?
- How can a distance-unit mix-up change a route-time result?
- Which two inputs belong in a simple pressure-altitude calculation?
- Why must all station arms use the same datum?
- How do you compare outside-air temperature with the model ISA temperature?
- What does a negative pressure-altitude result mean in the model?
- Why must an atmospheric calculation stay inside its stated altitude and temperature range?
- Why is calibrated airspeed not automatically the indicated number on a dial?
- Which fuel quantity belongs in an endurance calculation?
- How can you catch a per-hour versus per-minute fuel-flow mismatch?
- What observations are needed to estimate wind from a flown heading and track?
- How should an impossible wind-triangle solution be reported?
- Why is the direction uninformative when the calculated wind is zero?
- How can a headwind change trip fuel without changing fuel flow?
- How much time can be hidden by rounding every route leg?
- How should a heading calculation cross zero degrees?
- How can a completed leg be compared with its original time and fuel assumptions?
- How do you keep moment units and any scale factor consistent?
- How can an extra load change total weight, moment and centre of gravity?
- How should a removed load be represented without entering a negative final station weight?
- How can moving a load change centre of gravity without changing total weight?
- How do you check the order of points in a user-entered loading envelope?
- How can two fuel-load states be compared for their effect on centre of gravity?
- What assumptions make an educational flight calculation reproducible?