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(6) Directional control surfaces: Fins - - - - - - - - - - - 7.2 sq. ft. Rudders, balanced area: 3.95 sq. ft. - - - - - - 10.7 sq. ft. Rigging: Thrust line horizontal. Main plane incidence - - 4° 35' Dihedral - - - - - - - - 30° 30' Stagger - - - - - - - - 22" ail plane incidence: Maximum - - - - - - - 5° Minimum - - - - - - - 2° Propeller clearance - - - 7 in. CLIMBING TESTS. Standard Height | Time from start. | Rate of climb. | R.P.M. | Indicated air speed | % of Standard Density | Petrol Consumption. Stationary on ground. | Min. Sec. | Ft/min. | (1570) | | 102.5% | Gal/hr. 1000 ft. | | 37 | 1560 | | | 99.4% | " 2000 ft. | 1 | 15 | 1500 | 1568 | 78.5 | 96.3% | " 3000 ft. | 1 | 53 | 1435 | | | 93.2% | " 4000 ft. | 2 | 35 | 1380 | 1565 | 78 | 90.3% | " 5000 ft. | 3 | 20 | 1305 | | | 87.4% | " 6000 ft. | 4 | 10 | 1245 | | | 84.5% | " 7000 ft. | 5 | 0 | 1180 | | | 81.8% | " 8000 ft. | 5 | 55 | 1120 | 1560 | 76 | 79.2% | " 9000 ft. | 6 | 50 | 1035 | | | 76.5 % | " 10000 ft. | 7 | 50 | 990 | 1555 | 75 | 74.0% | " 11000 ft. | 8 | 55 | 925 | | | 71.7% | " 12000 ft. | 10 | 0 | 860 | 1550 | 73.5 | 69.5% | " 866