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2-Speed Propellers - Pioneer Research

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xylstra View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote xylstra Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 2016 at 01:33
Hi Nick,
            Thanks for your post. V-P propellers were still very much a 'work-in-progress' at the time so a multi-speed reduction gear-box would probably have received equal consideration as perhaps offering a solution. Any potential advantage in combat I'm sure would not have been overlooked.

                                  Cheers.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote xylstra Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2016 at 02:59
Hi Folks,
              Thought I'd throw in some new and interesting information since responses so far have yielded nothing firm on early 2-speed propeller research. 
   For those keen to follow-up, here's a couple of very early British patents concerning the first nascent attempts at a Variable-Pitch propeller:
    (1)   GB 127,326           June 6, 1918
    (2)   GB 130,664      August 14, 1918
   
  Do note that the dates are the 'grant' dates for these patents having been applied for a year or two before and therefore originated very early in the aerial conflict.
                     Food for thought!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NickForder Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2016 at 08:07
This rather reminds me of the assertion that there is nothing about bicycle design the Victorians didn't try first.
The period before the Great War, rather than during it, was a time of great innovation in the aeronautical world, it is just that the material science, engineering ability and - most important of all - the power-to-weight ratio of the engines had some way to go (the development of the internal combustion engine having made powered flight possible).
Hence, automatic pilot systems, armoured & all-metal aeroplanes, and Wittgenstein's 1910 idea for driving a propeller (often cited as the first 'jet') etc.
However, as has been pointed out, the impact of increased weight on performance often negated the advantages of the innovation.
What was good in theory could prove impractical.  
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