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Roberston/STOL details
For inquiring minds, R/STOL, using Robertson's technique for "NORMAL" and "STOL" takeoffs & landings goes like this:
NORMAL TAKEOFF
1) 2/3 flaps DOWN (or option 1/3)
2) Full throttle/2800RPM & Power Check
3) Elevator Control -- LIFT NOSE WHEEL AT 53 Knots
4) Accelerate to 65 Knots over 50' obstacle
5) Lower nose and accelerate to 87 Knots after clearing obstacle
6) Brakes -- Apply momentarily when airborne
7) Wing Flaps -- Retract to 1/3 after reaching 87 Knots
8) Landing Gear -- Retract after reaching 87 Knots
9) Accelerate to Climb Speed -- 96 Knots to 105 Knots
10) Wing Flaps - Retreact (if extended) after obstacles are cleared
NORMAL LANDING
1) Wing Flaps -- 1/3 below 143 Knots -- 1/3 to full below 94 Knots
2) Final Approach Speed -- 65 Knots
3) Touchdown Speed -- 53 Knots
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"STOL" TAKEOFF
1) Wing Flaps -- 2/3 DOWN
2) Brakes -- SET & HOLD
3) Power -- Full Throttle/2800 RPM & Power Check
4) Brakes -- RELEASE
5) Elevator Control -- LIFT NOSE WHEEL AT 44 Knots
6) Accelerate to 57 Knots over 50' obstacle
7) Lower nose and accelerate to 87 Knots after clearing obstacles
8) Brakes -- Apply momentarily when airborne
9) Wing Flaps -- Retract to 1/3 DOWN after reaching 87 Knots
10) Landing Gear -- Retract after reaching 87 Knots
11) Accelerate to Climb Speed -- 95 Knots to 105 Knots
12) Wing Flaps -- RETRACT to UP
MAX PERFORMANCE CLIMB
1) Airspeed -- 96 Knots
2) Power -- Full Throttle & 2800 RPM
3) Mixtures -- Adjust to 140 PPH
"STOL" LANDING
1) Wing Flaps -- 1/3 below 143 Knots - 1/3 to full below 94 Knots
2) Final Approach Speed -- 57 Knots
3) Touchdown Speed -- 44 Knots
4) Flare to Touch Down -- Elevator and Power to arrest sink
5) Wing Flaps -- Retract immediately after touch down
6) Landing Roll -- Apply heaving braking
STOL approaches utilizing ROBERTSON equipment are accomplished after practice. A constanty decelerating approach is utilized, requiring power to arrest rate-of-sink in the final portion from 50' to touch down.
The Roberston STOL equipment consists of a recontoured drooped leading edge cuff, two chordwise stall fences forward of the flap-aileron junction, interconnected drooped ailerons that deflect symmetrically and automatically with the flaps, automatic trim from a mechanically actuated spring operating in tension as part of the revised elevator control system as the flaps are dropped, two sets of vortex generators -- one set at the aft-end of the belly and another set aft of main wheel wells, and dorsal fairings on the upper and lower portions of the tail fins. And on our '77 P-model, the outboard fuel tanks are replaced with a slightly smaller tank, making useable fuel 71.5 gallons per side (143 total). This is necessary to accomodate the mechanical linkage to the alierons. On some of the earlier models with different tanking arrangements, yours may be different.
Typical sea-level ISA takeoff performance using the "NORMAL" Robertson method and 2/3 flaps results in a ground run of 650', or 1088 with a 50' obstacle in zero wind conditions at full gross weight of 4700#, and at 4200# a ground run of 495'.
Utilizing the "STOL" method with 4465# results in a takeoff run of 550'.
SkyKing
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