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Warbird Kid
 Post subject: P&W R-1535 Supplement?
PostPosted: Fri Mar 29, 2013 6:11 pm 
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Hypothetically speaking....

If you wanted to start a new-build production line of..... oh lets say SB2U Vindicators.....

A. Are Pratt & Whitney R-1535 Twin Wasp Junior engines rare?

B. And if so what engine would you use to supplement it?

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bdk
PostPosted: Fri Mar 29, 2013 7:23 pm 
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Nearly unobtanium I think. Might be easier to find a DB-601.

The Hughes racer had an R-1535.
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tow-3
PostPosted: Fri Mar 29, 2013 8:29 pm 
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Jim told me years ago that the only two 1535's in existence were in the two racers.
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bdk
PostPosted: Fri Mar 29, 2013 9:57 pm 
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That's not true. POF had one, unless they sold it on.
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davidwomacks
PostPosted: Fri Mar 29, 2013 11:35 pm 
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What happend to them all I mean they cant all have been scrapped.
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Dan K
PostPosted: Sat Mar 30, 2013 2:30 am 
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A handful on display...


New England Air Museum

http://www.neam.org/index.php?option=co ... it&id=1130


Pensacola

http://www.enginehistory.org/G&jJBrosse ... %20Jr..JPG



Aviation Museum of Central Finland

http://commons.wikimedia.org/wiki/File: ... umuseo.JPG


Going in the O-46 at Dayton

http://www.nationalmuseum.af.mil/shared ... 47-001.jpg



Alverca Air Museum-Portugal

http://www.aircraftengine.cz/Alverca/#P ... -1535%20(1).JPG

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daviemax
PostPosted: Sat Mar 30, 2013 7:02 am 
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As for a substitute, the similar Wright R-1510 would be an obvious choice, if you could find one . . . which is probably even more difficult.

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Daviemax
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Randy Wilson
PostPosted: Sat Mar 30, 2013 10:01 am 
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According to Graham White's Allied Aircraft Piston Engines of World War II, only 2880 R-1535s were built between 1931 and the end of production in 1941. With only 750 h.p. it just wasn't powerful enough for combat aircraft by then. Just FYI.

Randy
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The Inspector
PostPosted: Sat Mar 30, 2013 10:23 am 
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An 1830 is within a couple inches of the correct diameter and horsepower can be regulated by adjusting the throttle rigging. I'd wager the Boeing 247A was the probably the biggest user followed by the F2F and 'Windindicator'

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daviemax
PostPosted: Sun Mar 31, 2013 6:03 pm 
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I believe there was an 850 HP version of the R-1535.

The small diameter didn't buy much in terms of trade-offs - higher complexity and weight compared to existing nine-cylinder engines, which also had more power.

Makes one wonder what the engine planners were thinking....

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Daviemax
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The Inspector
PostPosted: Mon Apr 01, 2013 4:27 pm 
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daviemax wrote:
I believe there was an 850 HP version of the R-1535.

The small diameter didn't buy much in terms of trade-offs - higher complexity and weight compared to existing nine-cylinder engines, which also had more power.

Makes one wonder what the engine planners were thinking....

It was the JT-9D of 1933 all technical and cutting edge. :wink:

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