How to use the chart:
- Start in the upper left chart with the current temperature and go up the scale until you find your pressure altitude. This give you density altitude.
- Slide right to the Gross weight chart along a horizontal line equal to your density altitude until you intersect your current gross weight.
- Drop down vertically from there. This is your uncorrected take off distance (no wind, no slope)
- Drop down vertically to the zero wind line. Then follow the nearest curve upward (for headwind) or downward (tailwind) until you intersect the horizontal headwind (or tailwind) component. Then drop down vertically from there. This is your wind corrected take-off distance.
- Next slide horizontally to the lower left chart until your intersect your wind corrected take-off distance. Go up vertically to the zero slope reference line. Follow the nearest contour until you intersect the runway slope. Drop down vertically from there. You now have your GW, wind and slope corrected take-off distance. This is distance to T/O without obstacle clearance. I’ll add that latter on. Just follow the arrows for directions.
I printed this out. Folded in half and laminated it. I keep in my dash when I fly. I will someday work on a landing distance calculator as well.
Test conditions for this chart are:
GW: 1700-2200 lbs
Wind: -5-15 kts
OAT: 40-80° F
PA: SL-2000 ft
Dry concrete
Tire Pressure: 45 psi mains, 50 psi nose
From a standstill brakes were released and throttle applied to full in 3 seconds.
No flaps.
A 1-2 second rotation at 75 mph to approx. 3-4 degrees nose up.
Maintained centerline with rudder during roll (no brakes)
