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Extending the wing spar

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williamtsullivan(at)att.n
Guest

Posted: Sat Jan 03, 2009 7:41 am Post subject: Extending the wing spar

Nick- I have two sets of wings for my old Firestar.  One set is the original "clipped" set that came with the plane- 12 feet long.  The other set is from a newer model, 13 feet long.  Both sets are probably about 20 years old.  The longer set had had the aileron tubes extended at the root end by one foot.  The extension was done by butt ending the tubes and inserting a split tube insert about a foot long.  There were four rows of rivets securing the extension.  They were still straight and tight at the time of the crash.  Apparently the torque load did not bother anything.  Despite this, I agree with everyone else, and think that it is a very bad idea to extend the tubes at the root area, just for general principles and common mechanical sense.  Leverage, thrust, and drag all come together at this  point.  If you can't get longer tubes, think about working at the tip end.  One of the guys on the List can give you a reference to photos- I think it was Uncle Craig that did wing tip mods.

  

                                                    Bill Sullivan

                                                    Windsor Locks, Ct.

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williamtsullivan(at)att.n
Guest

Posted: Sat Jan 03, 2009 8:01 am Post subject: Extending the wing spar

Thanks, Possums.  That was one of the sets of photos I remembered, and the sturdiest.

  

 do not archive

                                               Bill Sullivan

                                               Windsor Locks, Ct.

 [quote][b]

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williamtsullivan(at)att.n
Guest

Posted: Mon Jan 05, 2009 7:51 am Post subject: Extending the wing spar

Nick- I think that someone put a "bulkhead" type end on the wing tip end, to interchange tip types.  It might be the Kolb test unit.  John Hauck might have pictures.  If you just want longer wings, why not just get longer tubing?

   You also mentioned putting flaps on it.  Are you intending to put separate flaps on, or make a flaperon type unit?

  

                                               Bill Sullivan

                                               Windsor Locks, Ct.

 34 degrees at 10:45am

 [quote][b]

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