cuting the dihedral
02-06-2009 | 12:58 PM
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From: lake peekskill,
NY
cuting the dihedral
I need to cut thr dihedral of my PT-40 MKII I need to cut the LE, TE, Center spar there are two ways to do this
I can lay the wing flat and tilt the saw or I can stand the wing on the LE and TE and cock the saw to the left and right
to make the cut what would be best hardest part of my build.
I can lay the wing flat and tilt the saw or I can stand the wing on the LE and TE and cock the saw to the left and right
to make the cut what would be best hardest part of my build.
02-06-2009 | 01:24 PM
#2
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RE: cuting the dihedral
If I understand you I assume you will cut this on a table saw? If so lay it flat and tilt saw. Just don't know why if wing is built you wish to cut the dihedral angle now?
02-06-2009 | 01:24 PM
#3
RE: cuting the dihedral
are you using a table saw, if so just make sure that you slide the wing straight through so that the wing will not have a angle forward or backwards. like so / \ I know that is extreme but you want the spar to be in straight line when you connect the two halves.
02-06-2009 | 03:02 PM
#4
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RE: cuting the dihedral
Forget the table saw, just use a long sanding block with 220 grit paper. Draw lines on the spars, lift the tip of the wing as high as you are looking for. If you use a block of wood wide enough just lay it flat on the table and draw it back and forth.
02-06-2009 | 04:58 PM
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From: lake peekskill,
NY
RE: cuting the dihedral
don't have a table saw, sanding might work for th LE, TE they are balsa but the main
spar is hard wood and needs about 1/2" removed. I orded a fine tooth hand saw, I
will be using this to make the cuts.
spar is hard wood and needs about 1/2" removed. I orded a fine tooth hand saw, I
will be using this to make the cuts.
02-06-2009 | 05:23 PM
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From: toronto,
ON, CANADA
RE: cuting the dihedral
ORIGINAL: wzak29
I need to cut thr dihedral of my PT-40 MKII I need to cut the LE, TE, Center spar there are two ways to do this
I can lay the wing flat and tilt the saw or I can stand the wing on the LE and TE and cock the saw to the left and right
to make the cut what would be best hardest part of my build.
I need to cut thr dihedral of my PT-40 MKII I need to cut the LE, TE, Center spar there are two ways to do this
I can lay the wing flat and tilt the saw or I can stand the wing on the LE and TE and cock the saw to the left and right
to make the cut what would be best hardest part of my build.
I cut mine with a jig saw, table saw would be better.
Once it was cut I sanded it and made 4 centre braces - LE, TE and two around the spar. I used good solid ply for this, the best I could find.
I fitted the braces and made it as tight as possible, using 30 min epoxy - lots of epoxy!
Once dried I filled in any gaps with balsa stock, again lots of epoxy.
I sanded everything down, and filled in any remaining gaps with expoy and micro balloons, then sanded again. Once that dried I put on a nice wide and think fiberglass cloth with epoxy.
The plane flew very will with the new wing. I put a OS .61 on it and it was a real missle. Sadly I made some other alterations after I did the wing, extending the elevator and rudder, I lost a control surface in flight and the plane went in, I never found it, but I am pretty sure the wing held together in the middle!
Good luck!
