History of aicraft piston engines

m aximum rated or takeoff power c r adiator cowling

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 0 3,070 8* 135 179 93 121 3 20 6 18 4 67 8 56 7 04 9 92 Air-cooled L angley (model) Anzani Renault Gnome Jupiter Jaguar Lawrance J - l Pratt & Whitney Wasp. W r i g h t 1 820 C ontinental A - 6 5 P ratt & W h i t n e y 2 800. Pratt & Whitney 4 360. W r i g h t 3350 3.2 24.5 35 50 4 00 3 60 2 00 4 25 d D ropped to 12 h p after 1 min. All liquid-cooled engines later than Curtiss D-12 are s upercharged. All air-cooled engines later than Lawrence J - l , except C ontinental, are supercharged. » Refers to year of first general use (except for Langley e ngine). Where two dates are given, they refer to typical early a nd late models of the same basic engine. * M aximum rated, or takeoff power. c R adiator, cowling, and coolant arc not included in the weight of liquid-cooled engines Cowling is not included for air-cooled engines. 88 l atter two remain in air-transport service, as do also the Pratt & Whitney R -1830 a nd Wright R -1820 (in the D C - 3 airplane). There are also some P ratt & Whitney 9-cylinder Wasp and Wasp Jr. engines in service in m edium-powered airplanes, especially in Canada, and a few remain in service in the old Ford trimotors dating from about 1930. A few Pratt & W hitney R-4360 28-cylinder engines also remain in service. W here the piston engine continues to reign supreme is with the popular light plane. Literally tens of thousands of air-cooled, horizontally opposed piston engines manufactured by Continental, Lycoming, and Franklin power American light planes; and they have their counterparts in lesser q uantities in Europe. Although by no means as dramatic as the powerplants that count their horsepower in four digits, these modest prime movers h ave enjoyed greater quantity production than any other type of aero e ngine except those for model airplanes. F igure 72 also includes a family tree for rocket, turbo-jet, and t urboprop engines. The history of these developments is so recent and so well covered in the literature (particularly by Schlaifer and G ibbs-Smith) t hat n o attempt will be made to cover it here. There could well be a paper as long as this one, or even a whole volume, devoted to this important and r evolutionary development in aircraft propulsion. I t is interesting to review the contributions of the various nations in t he field of aircraft propulsion. Table 2 summarizes this subject. It is e vident that the United States and France have been the principal contributors to early engine development, while England has made significant c ontributions in late piston and early turbine engines, and Germany was t he first to fly rocket and jet engines, although German and British turbojet d evelopment was concurrent. If the art and science of aircraft propulsion develop as fast in the next 50 years as they have since the Wright brothers' initial flight, the following p rophecy of Lester D. Gardner in Aviation (vol 1, no. 1, August 1916), will be as meaningful today as it was then: Now many of the most distinguished scientists in all countries are giving aeronautics close and careful study. From the work of these men aeronautics wi...
View Full Document

This document was uploaded on 01/19/2014.

Ask a homework question - tutors are online