by Carl Kuhns
Photographs were taken by my father, John W. Kuhns, 1914-1987.
He was a physician, pilot and Harley rider.
I find the most interesting part of an aircraft to be its engine.
Every year from 1950 through 1969, my parents would take an airline trip to Europe, South America, or Hawaii. The photographs taken on those trips are the basis for my engine nacelles photo essay.
The progression of propeller spinners is noteworthy. The DC-4 had no spinner. The Boeing 377 had a small one. The DC-7 and the Constellation were equipped with large spinners and an afterbody (cowling interliner) behind the propellers.
Although the DC-7 and Constellation used the same engines, the designers had different ideas when selecting propellers. The DC-7C had a 4-blade propeller with a diameter of 167.875 inches. A 3-blade propeller with a diameter of up to 181.312 inches was installed on the Constellation.
There is a side note on two of the airlines featured in this photo essay. Pan American Airways Boeing 377 N90944 was lost on November 8, 1957. N90944 Clipper Romance of the Skies was on a flight between San Francisco and Honolulu when it went down in the Pacific Ocean, leaving no survivors. The passengers on the Fawcett DC-4 were given oxygen masks on a flight over the Andes Mountains because of the unpressurized cabin.
|Powerplants||Pratt & Whitney Wasp Major TSB3-G|
|Propellers|| Curtiss Electric C6445-B302 Hubs with 1052-2004-30 blades, 200" dia|
Hamilton Standard 24260 Hubs with 2J17B3-8W, 2J17F3-8W, 2J17H3-8W or 2J17Z3-8W Blades, 196.875" dia
|Propeller Reduction Ratio||0.375:1|
|Source||FAA Aircraft Specification No. A-812|
|Powerplants||Pratt & Whitney 2SD13G or R-2000-11M2|
|Propellers||Hamilton Standard 23E50 Hubs with 6507-0 Blades, 156.375" dia|
|Propeller Reduction Ratio||0.50:1|
|Source||FAA Aircraft Specification No. A-762|
|Powerplants||Wright 988TC18EA1 or 988TC18EA4|
|Propellers|| Hamilton Standard 34E60 Hubs with 7019-2 Blades, 167.875" dia|
Hamilton Standard 502875, 508529 or 526379 Spinners
Douglas Cowling Interliners
|Propeller Reduction Rato||0.4375:1|
|Source||FAA Aircraft Specification No. 4A10|
|Powerplants||Wright 972TC18DA3, 988TC18EA3 or 988TC18EA6|
|Propellers|| Curtiss Electric C634S-S Hubs with 858-5C4-0 blades 180" dia|
Curtiss 145491 Spinners
|Propellers|| Hamilton Standard 43H60 Hubs with 6959B-0 or 6967-0 Blades, 181.312" dia|
Hamilton Standard 97197 Spinners
|Propellers|| Curtiss Electric C634D-A2 or C634D-A4 Hubs with 109652-12 Blades, 180" dia|
Curtiss 152331 or 153121 Spinners
|Propeller Reduction Ratio||0.4375:1|
|Source||FAA Aircraft Specification No. 6A5|
|Powerplants||Rolls-Royce Dart 510|
|Propellers||Rotol R130/4-20-4/12E with RA 25842 blades, 120" dia|
|Propeller Reduction Ratio||0.0931:1|
|Source||FAA Aircraft Specification No. A-814|
|Powerplants||Pratt & Whitney JT3C–7 with Exhaust Noise Suppressors|
|Source||FAA Aircraft Specification No. 4A25|