P&W R-1340 details

General information about the Wing42 Lockheed Vega.
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Tailspin45
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P&W R-1340 details

Post by Tailspin45 » 23 Jun 2018, 22:40

Image

Official paint colors:

Gray Paint - Originally provided by Kay and Ess Company of Dayton, Ohio. "No. 839 Blue Gray Airdry Enamel", Military Specification: MIL-E-7729, Enamel, Gloss, For Aircraft Use, Gray

Black Paint - Military Specification: MIL-E-5557, Enamel, Heat Resisting, Glyceryl-Phthalate, Black


Discussion of all the R-1340 variants at

https://www.dhc3otter.com/r1340detail.htm

Appears to be authoritative!
Special thanks to P&W Archives volunteer Jesse Hendershot for researching data for me!
From aerofiles.com
R-1340 Wasp (Wasp CG) 1926 (ATC 55, 5E-2) = 410-600hp 1344ci 9RA. George Mead, Andrew Willgoos. The first P&W.

While not the first radial aircraft engine—that was an operating six-cylinder with two banks of three cylinders and a double-throw crankshaft built in 1913 by J W Smith in Cicero IL—the Pratt & Whitney was certainly the most successful.

When Frederick B Rentschler and a group of Wright engineers left that company and formed their own group in 1925 to produce the nine-cylinder R-1340 Wasp, they had neither official organization nor name when the prototype was submitted to USN for evaluation.

The very un-aviation Pratt & Whitney Machine Tool Division of Niles-Bement-Pond Corp (Hartford CT) had made castings for the prototype and cast its name in the metal housing. Navy evaluators dutifully transcribed this name into their records and a company was born, even though there was no actual connection with the original tool manufacturer. The first Wasp (410hp), designed by George Mead and Andy Willgoos, was completed on Christmas Eve 1925, passed USN tests in March 1926, and a Boeing F2B-1 was selected as the first operational plane to use the new motor.
P&W company history from the Aviation Engine Historical Society at

http://www.enginehistory.org/Piston/P&W/P&W.shtml

The company was famous for making a comparator that could measure to .050". Later they touted that they could mill engine parts, when necessary, to .0002".

Image
Blue skies and tailwinds - Tailspin Tommy (aka Tom)

Jarek
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Re: P&W R-1340 details

Post by Jarek » 23 Jun 2018, 22:56

Nice quality! "A must have" option to place this mark on the oil sump :)

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Tailspin45
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Re: P&W R-1340 details

Post by Tailspin45 » 23 Jun 2018, 23:05

Jarek wrote:
23 Jun 2018, 22:56
Nice quality! "A must have" option to place this mark on the oil sump :)
Open in another tab and click to enlarge. It's about 2900 x 2500m pixels!

BTW, a US penny goes in the sump drain plug behind the safety wire (for luck, of course). It exactly the right size hole.
Blue skies and tailwinds - Tailspin Tommy (aka Tom)

Jarek
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Re: P&W R-1340 details

Post by Jarek » 24 Jun 2018, 01:31

BTW, a US penny goes in the sump drain plug behind the safety wire
Nothing mentioned about this in the overhaul manual ;-)
I have decided to take a deep dive into it (despite very bad copy quality) to look at the supercharger drive construction. It is directly driven from the shaft by set of gears, unlike complex constructions I've seen on British engines. So if shaft rotates, impeller rotates too. One of the gears contains "magic clutch". Basically it is the same thing that we have on the clutch plate in modern cars. Outer and inner gear ring are coupled together by a set of 6 springs, so they can absorb rapid acceleration/deceleration forces. That's it, nothing really complicated in this engine which may easily break - like mark on the plate: Dependable Engines.

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Tailspin45
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Re: P&W R-1340 details

Post by Tailspin45 » 24 Jun 2018, 01:52

Here ya go. Very clean and clear details from overhaul manual (PDF, 28Mb)

It's for the R-1340-AN-1 but the supercharger is exactly the same.
Blue skies and tailwinds - Tailspin Tommy (aka Tom)

Ifikratis
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Re: P&W R-1340 details

Post by Ifikratis » 24 Jun 2018, 14:21

Tailspin45 wrote:
24 Jun 2018, 01:52
Here ya go. Very clean and clear details from overhaul manual (PDF, 28Mb)

It's for the R-1340-AN-1 but the supercharger is exactly the same.
Amazing, thanks! Impressed thinking that most of these images are paintings coming from photographs !

Jarek
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Re: P&W R-1340 details

Post by Jarek » 29 Jun 2018, 23:33

History of the R-1340 Wasp engine design:
http://www.asme.org/wwwasmeorg/media/Re ... Engine.pdf

Jarek
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Re: P&W R-1340 details

Post by Jarek » 30 Jun 2018, 13:22

The only flying Vega's brother - Vintage Fokker Universal with R-1340 Wasp - engine sounds in various phases of flight

phpBB [media]

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Tailspin45
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Re: P&W R-1340 details

Post by Tailspin45 » 01 Jul 2018, 01:58

I'd love to fly that Fokker, pardon my French. (A double pun, sorry, couldn't pass up the opportunity).

Here's a Fairchild 71 cranking
phpBB [media]
Blue skies and tailwinds - Tailspin Tommy (aka Tom)

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Tailspin45
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Re: P&W R-1340 details

Post by Tailspin45 » 01 Jul 2018, 02:01

Here's a list from Covington Aircraft of all the aircraft that were dragged through the air by an R-1340 of one sort or another.

Note that geared 1340s such as the DH Otter sound very different. For that matter the sound equipment recording them make them sound very different too.
Curtiss Falcon
Curtiss F7C Seahawk
Curtiss O-52
Curtiss P-6S Hawk
Curtiss SOC Seagull
de Havilland Canada DHC-3 Otter
Douglas Dolphin
Fairchild 71
Fairchild FB-3
Fokker F.10
Fokker F.32
Ford Trimotor
Gee Bee R-1
Gee Bee R-2 Super Sportster
Gee Bee R 1/2 Super Sportster
Gee Bee Z
Gee Bee QED
Grumman Mallard
Grumman Ag Cat
Howard DGA-6
Ireland N-2C Neptune
Junkers W 34
Junkers Ju 52
Knoll Aircraft Company KN-3[4]
Kaman HH-43 Huskie
Lockheed Vega 5
Lockheed Model 8 Sirius
Lockheed Model 9 Orion
Lockheed Model 10-C & 10-E Electra
Lockheed XC-35
Loening OL-8
Noorduyn Norseman
North American BC-1
North American T-6/SNJ Texan/Harvard
Northrop Alpha
Northrop C-19 Alpha
Scottish Aviation Twin Pioneer
Sikorsky H-19
Sikorsky S-38
Thomas-Morse XP-13A Viper
Vought O2U Corsair
Wedell-Williams Model 45
Westland Whirlwind (helicopter)
(Off topic, but we were hired to provide some radial engine sounds for The Mummy movie. They mounted a mic almost in the exhaust and another near the carb, both which I thought was odd. But after asking me to make it backfire and also to quit - in flight - they played the raw recording for me while standing in the hangar. Scared the hell out of me because I thought someone had really started the engine right there in the hangar!)
Blue skies and tailwinds - Tailspin Tommy (aka Tom)

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