The Boeing 247

This very advanced all-metal monoplane, designed as a 12 passenger airliner, has all the most modern features: air conditioning and cabin heating, sound proofing, radio, a de-icing system for the wings and tail, variable pitch three-bladed propellers, engine superchargers, flaps, and retractable landing gear. The first flight by a Model 247 was on February 8.1933. The hinged nose allows access to a luggage compartment.

Some modifications have been made to the aircraft of the Starkweather-Moore Expedition, as follows: retractable ski landing gear, oxygen breathing apparatus, extra radio equipment, gyrocompass, radio direction finder, artificial horizon, an eight-gallon fresh water tank, extra fuel tanks, lightweight folding seats, wider doors (to fit cargo and fuel drums). motion picture camera rack and optically flat window. and electric engine heaters.

The engines are two Pratt & Whitney "Wasp" SIHI-G nine cylinder air-cooled radials, 550 HP each. Features include inertia (hand cranked) and electric (battery) starters, engine fire extinguishers, and a 12-gallon oil tank fitted in each engine nacelle. Each engine uses 25 gallons of gasoline per hour at 'cruise' setting, 35 gallons per hour at full power. Total fuel capacity is 770 gallons: 220 gallons in the wing tanks, and 550 gallons in auxiliary tanks built into the fuselage. Engine overhauls are needed after 300 hours of operation. The Model 247 can climb with one engine shut down, up to 6,000 feet altitude, depending on load.

Starkweather-Moore configuration:

empty weight 11,000 lbs. (no fuel, oil, cargo or passengers; includes seats, radios, etc.)
maximum gross weight 17,000 lbs.
emergency overload 19,500 lbs. (cannot take off at high altitudes at this weight)
each crew/passenger 200 lbs. including clothing, worn equipment, etc., for planning purposes
emergency supplies 100 Lbs. per person aboard each passenger seat. 10 lbs. (12 aboard; could be tossed out in emergency)
gasoline, per gallon six lbs.; 4620 lbs. when all tanks filled
lube oil, per gallon 7.5 lbs.; 180 lbs. fully loaded
radio set 150 lbs.(could be tossed out in emergency)
husky sled dog 90 lbs.
dog sled 100 lbs.
oxygen tank 20 lbs.; 80 cubic feet of oxygen. good for 16 man-hours of work
cruise speed 170 miles per hour
max speed 200 miles per hour
stall speed 60 miles per hour, flaps down
ceiling 25,400', assuming not above max total weight limit
range up to 2600 miles, depending on fuel amount carried
takeoff/landing 900' at maximum gross; as little as 600' light; 1200' landing on skis
wingspan 74' (12.3" in scale)
length 51' 7" (8.6" in scale)
height 12' 2" standing on landing gear
On a typical cargo flight
empty plane 11,000 lbs.
two pilots 400 lbs.
emergency supplies 200 lbs.
lube oil 180 lbs.
fuel 770 gallons; 4620 lbs.; 2600 miles range (to destination and back, plus reserve)
cargo or passengers 1590 lbs.; five passengers with SM emergency supplies plus hand sled, or 260 gallons fuel, or nine dogs + sled + 680 lbs. supplies
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