TCDS ATC 648

MODEIS: Waco UKS-7, VKS-7 (Army UC-72D), VKS-7F I.C._NUMBER: 648 I - Model UKS-7, 5 PCL-SB (Approved 6/8/37) (Same as UKS-6, ATC 528, except wing fittings, landing gear moved forward 4 inches, fixed trim tab added to rudder, miscellaneous changes in fuselage and controls) Engine Continental W670K or W670K1 Fuel 65 minimum octane aviation gasoline Engine limits Maximum, except take-off (K) : or 2200 rpm (230 hp) (K1) (one minute) 2175 pm (225 hp) (K) ; or 2200 Ipm (230 hp) (K1) Airspeed limits Glide or dive - 168 mph True Ind. Propeller limits Maximum permissible diameter 102 inches C. G. range Landplane (-14.4) Maximum weight Landplane 3250 1ts. No. seats Maximum baggage 100 1bs. (+45) Fuel capacity 70 gallons (two 35 gallon tanks in upper wing) (-11.5) 0il capacity 5 gallons (-44) Control surface movement Not available Serial numbers eligible 4551 and up Required equipment Landplane: Iten 11819) 1192 1103(a), 104(a), 105(a), 106, 107, 108(a) , Seaplane: 101 (a), 102, 103 (a), 104 (a), 107, 108 (a). 110, 151. II - MODEI VKS-7 (Army UC-72D), 5 PCI-SB (Approved 6/8/37) (Same as UKS-7 except engine installation) Engine Continental W670M or W670M1 Fuel 80 minimum octane aviation gasoline Engine limits Maximum, except take-off 2200 rpm (240 hp) (M) ; or 2200 Ipm (250 hp) (M1) Take-off (one minute) 2200 rpm (240 Fp) (M) or 2200 rpm (250 hp) (M1) Airspeed limits Level flight or climb - Glide or dive - 168 mph Irue Propeller limits Maximum permissible diameter 102 inches C.G. range Landplane (-14.4) to (-2.5 Maximum weight Iandplane 3250 1bs. Maximum baggage 100 1bs. (+45) Fuel capacity (two 35 gallon tanks in upper wing) (-11.5) Control surface Not avialable Serial numbers eligible 4551 and up and all AAF numbers of Model UC-72D. Use manufacturer's number when available. Required equipment Items 101 (a), 102, 103(a), 104(a), 105(a), 106, 107, 108 (a). 109, Items 101 (a) . 102, 103 (a). 104 (a), 107, 108 (a). III - MODEL VKS-7F, 5 PCIE (Approved 7/28/42) (Same as VKS-7 except addition of split flaps on lower surface of upper wing, Flettner rudder tab, miscellaneous changes to structure and control system) Engine Continental W670M Fuel 80 minimum octane aviation gasoline Engine limits Maximum, except take-off in. Hg.. 2200 IIm (240 hp) Take-off (one minute) -- in. Hg.. 2200 Ipm (240 hp) Airspeed limits Level flight or climt - 140 mch True Ind. Glide or dive - 168 mph True Flaps extended - 102 mph True Propeller limits Maximum permissible diameter 102 inches C.G. range Maximum weight 3250 1bs. NO - seats 5 (2 at -3), (3 at +27) Maximum baggage 1ks. (+45) Fuel capacity 70 gallons (two 35 gallon tanks in upper wing) (-11.5) Cil capacity 3-1/2 gallons (-44) control surface Not available Serial numbers eligible Required equipment 5279 and 6101 and up 108 (a), 109, 110 a03 11; 10+ (b), 105 (b), 106, 107, 101(b). SPECIFICATIONS PERTINENT TO ALL MODELS: Datum Leading edge of lower wing Leveling means Lower surface of upper wing at strut points must be Certification basis Type Certificate No. 648 (Aero. Bulletin 7A) Production basis Export eligibliity ligitle for export as follows, for equipment specified in MOp - Seaplane (UKS-7 and VKS-7 only) - Maximum weight 3430 1bs. - Skiplane - Not eligible. However, complies with Canadian requirements for ski installation when equipped with special (D) New debianouneries except hustralia and EQUIPMENT: Propellers and Propeller Accessories 108- Propeller - Curtiss Model 55501 - Diameter 8'0" maximum, 7'10" (Must be installed with blades at right angles to engine crankthrow (either 90 or 270 degree position). Restrict engine operation to 2000 rpm maximum and placard tachometer Adjustable metal propeller +27 105- Ibs. (-79) (-79) Hamilton Standard propeller, blades 6135A-6 or 6135A-7. Diameter 8'6-1/8" maximum, 8'3-7/8" Pitch rarge 10 degrees to 14.5 degrees.) (VKS-7F only) +51 1bs. (-79) Engine and Engine Accessories - Fuel and Oil System 101. (a) Engine ring cowl 27 Ibs. (-63) 101 Or (b) Engine ring cowl (Drawing 21992) 34 1bs. (-63) (Eclipse F-80) 20 lbs. (-51) 5 lbs. (-65) 201. Large starter +10 1bs. maximum (-53) cil heater 3 lbs. 15 gallon fuel tank (1 or 2 in lower 17 1bs. each 6-1/2 gallon oil tank (UKS-7 or VKs-7 only) No weight change 5 gallon oil tank (VKS-7F only) No weight change 309. Engine shielding 11 Ibs. (-75) Landing Gear and Floats 105. 7.50-10 wheels (Hayes 750M) 8.50-10 4-ply tires (Models UKS-7 and VKS-7 only) 63 1bs. (-28) 320 or 105. (b) 7.50-10 4-ply tires 60 1bs. (-28) 106. 10x3 tail wheel 5 1bs. (+183) 109. Wheel cuffs 4 1bs. (-28) 111 Or 316. Wide type landing gear - tread 103-1/2 inches 151. Edo 38-3430 floats with water rudders UKS-7 or VKS-7 only) *318 1bs. (-6) 213 or 301- Wheel streamlines 21 1bs. (-24) skis (eligible on any airplane o] chese models provided the propeller installation meets the minimum 9 inch ground ciearance. The maximum weight for the skiplane will be the same as for the corresponding landplane or that showr. in parenthesis after each ski model, whichever is less) Use actual weight change (maximum 2500 1bs.) 302. Cactus proof tubes Tail wheel lock Neglect weight increase +5 1bs. 319. Steerable tail wheel (Drawing 22727 or Drawing 23143) +6 1bs. (+178) Electrical Equipment 103. Generator (a) Eclipse G-1 21 1bs. (-52) (D) Eclipse G-2 21 Ibs. (-52) 104. (a) Battery - Reading ARL-11 35 lts. (-44) Battery and box - Reading R-33-I 33 1bs. (-44) 202. Large generator + 6 1bs. maximum (-54) 214. Battery - Exide 6-TS-13 41 1bs. (-44) 308. Landing lights (Grimes retractable) (UKS-7 or VKS-7) (+7) (VKS-7F only) • 1bs. (-18) Interior Equipment 110. control column - throw-over type 11 1bs. (-24) 205. Leather upholstering *12 lbs. (+7) 206. Litter installation +25. 1bs. (+97) 207. Rear parachute type seats 211. Sound proofing 303- "Y" type control column +3 1bs. (-24) 307. Flares (a) Three 1-1/2 minute (b) Five one minute 312. Cabin ventilators 314. Cabin heater (UKS-7 or VKS-7 only) 315. Front parachute type seats 318. Revised windshield (URA-7 or VKS-7 only) Cabin heater (Models VKS-7 and VKS-7F (Surface Combustion Co. Model AGU-15N-L2) (See Waco Drawing 23719) *15 1bs. (+27) vertical tail surface (replacing landplane type) +10 1ks. (+185) Extra door and wing walk +16 Its. (+19) Airbrakes (UKS-7 or VKS-7 only) +10 Its. Bonding (VKS-7F only) 6 1bs. (-3) NOTE A. Each aircraft manufactured subsequent to 1/11/49, must prior to origina! certification, satisfactorily pass: (a) An inspection for workmanship, materials and conformity during construction. (D) A final inspection of the completed aircraft. (c) check of flight characteristics.