From: email@example.com (Jim Maurer) Organization: Specialix Inc. Date: 04 May 93 11:22:53 PDT References: 1 Followups: 1
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"John (J.F.) Hawkins" <firstname.lastname@example.org> writes: >I've gotta question about the venerable 707 jet. I've taken a liking >to the old bird, and have started collecting pictures, postcards, whatever >I can get ahold of containing images of the noble jetliner. In these images >I notice something peculiar about the outboard engine nacels (sp?) namely, >they are different from one another (No. 1 nacel != No. 4 nacel). ... >The number one engine (on captain`s side?) seems to have a shorter nacel >which tappers off into the engine cowling itself in a smooth fashion about >mid-way between intake and exhaust. The number four engine (co-pilots >side?) terminates in a large bulge above the engine intake in what appears >to be another, though smaller intake. Is this some sort of auxiliary >powerframe for when the jet is sitting around on the ground? The bumps on engines 2, 3, and 4 are turbo compressors for cabin pressurization. The number 1 engine doesn't have the bump. I guess they only needed 3 of them. The 720 only had 2 engines (numbers 2 & 3?) with turbo compressors. That was the main spotting feature to tell the difference. Another clue (but it didn't always work) was that the 707s have a "spike" antenna coming out the top of the vertical stablizer for high frequency communications, most 720s didn't have that. Ah, I miss the good old days watching 707s, 720s, DC-8s, and the occasional DC-7 and Constellation at SFO!