Re: Ceiling Bumps was Re: Word.

From: John Barker <john.barker783_at_ntlworld.com>
Date: Sun, 23 Dec 2012 11:39:59 -0000

Joshua, as I read of Hope's dilemma I found myself thinking, 'why not increase the pitch a little' but then I found that you were looking for an alternative solution. After a little more thought it came to me. Joshua, you are a big boy now, indeed a married man, and it is time to put aside your childish ambitions to have the lightest model aeroplane on the planet and make a propeller that is strong enough. I was tempted to say that's easy, you only have E and cross section to worry about but I suppose the load distribution is a bit of a head scratcher.

If you still want to make floppy aeroplanes what about a dodge, used in the earliest days of microfilm if I recall correctly, where wings or tailplanes had an auxiliary surface to twist the main surface. In your case imagine one of the longest propeller ribs extended beyond the trailing edge a few inches. On the end of the rib stick a flat plate, say 20mm diameter. When the model dives the drag on the plate will twist the propeller blade to a higher pitch. Well, you did ask!

John Barker - England
Received on Sun Dec 23 2012 - 03:40:05 CET