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Joined: 03 March 2016
Location: United States
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Posts: 526
Posted: 16 May 2019 at 5:21pm | IP Logged Copy link to clipboard   Quote Paul_L

Cherokeecruiser wrote:
Hi All

This is a great thread. Been following with much interest

I believe, (and am happy to be corrected) that the 737 100/200 had JT8D rather than JT3D engines. The JT8D got up to 17,400Lbs thrust on the -17R.

The choice of engine type was up to the customer airline. Pylons were available to hang JT3s, JT8s, GEs, and Rolls-Royce. Most airlines chose the JT8D-3F since these were mostly used in the U.S. on short routes and P&W had better support in the U.S. It was very difficult to get 737 aircraft across the pond to Europe since they didn't have HF radio systems or life rafts.

Pan Am had about 22 B727-100 series aircraft which were equipped with life rafts, HF comms and LORAN receivers. We used them in the Caribbean. But, we also had about 42 727-100s without HF or life rafts but with UHF communications which were used in Itra-German service. We got those operating rights due to the support we had provided to the Berlin airlift. Those aircraft could not normally cross the pond. We did the composite basic service in hangar 17 at JFK. We would ferry these aircraft across the pond by strapping a small life raft to the first class seats and have the 727 wait on the ground at Gander or Shannon.

When a regular 707 passenger flight passed overhead the 727 would take off, climb, rendezvous with the 707 and fly formation with the 707 across the pond. The 707 would provide communications for the formation flight using its HF systems and over-water navigation using its octant port and human navigator to do celestial navigation. The distance from SNN to OCX was about 1975 miles which was just within the range of the 727-100 when empty.

Extended over-water operation is still more complicated than flying continental routes using VOR navigation and tight ATC control. R-nav, GPS and/or INS make it simpler but you still need HF comms, Mae Wests and life rafts which adds a lot of weight. You select engines, JT8 vs JT3, based on your route structure.

Paul in NY

Edited by Paul_L on 16 May 2019 at 5:26pm

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