From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Comparison table of physical dimensions, weights, and performance for a Tropic-Aire and a McCord car heater.
| Identifier | ExFiles\Box 137\1\ scan0265 | |
| Date | 17th April 1939 guessed | |
| File Heating 1158 Messrs Rolls-Royce NAME OF HEATER TROPIC-AIRE UNIVERSAL MODEL CAR HEATER. McCORD CAR HEATER DE LUXE MODEL CH.102 TRIAL NO. 634 645 PHYSICAL DIMENSIONS Overall length 9¼" 9½" Overall height 9⅜" 9⅜" Overall width 8¼" 5¼" Element length 2¼" 3" Element height 5⅛" (between tanks) 7" (between tanks) 9½" overall Element width 6½" 7" Diam. of Motors 3" dia. 2¾" over casing 3⅜" overall 2.5/16" x 2.3/32" x 1¾" over casings 3.7/16" x 3.⅜" x 2⅛" overall Fan diam. 6"! 4 Blades 4 Blades 6¾" diam. 25° sucking WEIGHTS Wt. of Heater 9-lbs, 14-ozs. 12-lbs, 9-ozs. Wt. of element 3-lbs, 1½-ozs. 5-lbs, 14-ozs. Wt. of casing 5-lbs, 5½-ozs. 4-lbs, 14-ozs. Wt. of Motor 1-lb, 6½-ozs. 1-lb, 10½-ozs. Fan 2½oz Wt. Fittings and parts (less hose) 1-lb, 5½-ozs. 1-lb, 4½-ozs. Hose 1" o/d x ¹¹⁄₁₆" i/d.{John DeLooze - Company Secretary} TRIAL DETAILS Volts 12.0 12.0 Watts 17.1 24.2 Water flow gals/min 2.0 2.0 Water pressure ins/water 5.55 18.8 B.Th.U's at 120°F T.D. 6,370 10350 Air flow cu.ft/min 109 140 MOTOR PERFORMANCE WITH STANDARD 20° BUS HEATER FAN. AT 12 VOLT R.P.M. 1,410 1,350 Equiv. B.H.P. .0061 .0057 Watts taken 24.36 24.6 Motor efficiency 18.7% 17.25 Noise Quiet | ||