Andrew Bourne Posted April 9, 2013 Share Posted April 9, 2013 Please can anyone help? The plan instructions for wing washout say "jigged sub TE, 3/8" under root rib, tapering to 1/8" under tip rib". I am confused becasue I would expect more washout at the tip than the root?" Please can anyone help? Many thanks in anticipation. Quote Link to comment Share on other sites More sharing options...
Ruprect Spode Posted April 9, 2013 Share Posted April 9, 2013 Seems simple enough Andrew, they've got it mixed up when publishing. Ruprect Quote Link to comment Share on other sites More sharing options...
will -0 Posted April 9, 2013 Share Posted April 9, 2013 Is the wing build upside down? Quote Link to comment Share on other sites More sharing options...
Andrew Bourne Posted April 10, 2013 Author Share Posted April 10, 2013 Thanks Guys, this is the only instruction on the plan. "IMPORTANT The correct wing washout is produced by fixing the lower sheeting first. The wing is placed on the building board with the lower surface in contact along the entire length in the proximity of the main spar The sub TE is jigged on tapered supports 3/8" at R1 3/16" at R17 1/8" at R28." (where R1 is root and R28 is tip) Perhaps this indicates that the wings are indeed built upside down! But it certainly not clear! Quote Link to comment Share on other sites More sharing options...
Mal Quelch Posted April 12, 2013 Share Posted April 12, 2013 Andrew, On the plan do you have two wings (L&R) or are they superimposed such that you build one at a time over the same drawing? If that is the case are you expected to build a particular wing first and could that explain it? Mal Quote Link to comment Share on other sites More sharing options...
Andrew Bourne Posted April 12, 2013 Author Share Posted April 12, 2013 Thanks Mal, Only one wing shown, I printed off a 'mirror' in the hope of making it more straight forward! Andrew Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted April 12, 2013 Share Posted April 12, 2013 I can't make much sense of those instructions. Many years ago, I owned a share in an ASW20L and something in the back of my mind is suggesting that there might have been a change in wing section towards the tip to reduce tip stalling. A little research hasn't confirmed this but I did see a reference to Mike Trew using full size sections for some of his model designs. Washout in gliders does have some disadvantages in that it creates a large twisting force at high speed which can limit VNE so possibly this would be a way to reduce this? (just thinking out loud) Have you approached the publisher to see if Mike is still around and contactable? The horse's mouth would be a good place to start - or perhaps see if you can contact the author of this build log who had obviously got to the lower sheeting phase... P.S. Not relevent to the query but while I was having a quick poke about I came across this really well produced video of another Mike Trew design being flown - worth a look in my opinion.... Quote Link to comment Share on other sites More sharing options...
Andrew Bourne Posted April 13, 2013 Author Share Posted April 13, 2013 Thank you, really kind of you to take the troube. Videos lokk really useful. Thank you again. Andrew Quote Link to comment Share on other sites More sharing options...
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