If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
|
Thread Tools | Display Modes |
|
#1
|
|||
|
|||
Wing walk ply question.
My plans don't give a lot of detail about my wing walk but it's for a truss
rib mostly wood wing. The walk is supposed to go from the front spar to the trailing edge and should be 1/4 ply. my question is will a piece of 1/4 ply bend around the curvature of the wing (Clark Y) or should I laminate, say, two pieces of 1/8 ply? If I were to laminate, what would the best way of ensuring i got decent contact between the top and bottom surfaces? |
#2
|
|||
|
|||
Wing walk ply question.
"Mustardbuilder" wrote in message .130... My plans don't give a lot of detail about my wing walk but it's for a truss rib mostly wood wing. The walk is supposed to go from the front spar to the trailing edge and should be 1/4 ply. my question is will a piece of 1/4 ply bend around the curvature of the wing (Clark Y) or should I laminate, say, two pieces of 1/8 ply? If I were to laminate, what would the best way of ensuring i got decent contact between the top and bottom surfaces? The designer should know, if it has been built before. I would think that you would trust him, if you are trusting him for your life on the rest of the design. That small bend should not be a problem. If you do laminate, use a 1/8th inch notched trowel to spread adhesive, place the two together firmly on a flat surface using another thicker flat surface on top to apply some pressure, then wiggle the two pieces back and forth a little. Apply the two pieces at one time without taking apart again. -- Jim in NC |
#3
|
|||
|
|||
Wing walk ply question.
"Morgans" wrote in
: "Mustardbuilder" wrote in message .130... My plans don't give a lot of detail about my wing walk but it's for a truss rib mostly wood wing. The walk is supposed to go from the front spar to the trailing edge and should be 1/4 ply. my question is will a piece of 1/4 ply bend around the curvature of the wing (Clark Y) or should I laminate, say, two pieces of 1/8 ply? If I were to laminate, what would the best way of ensuring i got decent contact between the top and bottom surfaces? The designer should know, if it has been built before. I would think that you would trust him, if you are trusting him for your life on the rest of the design. I do trust him, but I didn't get to ask him before he died! It's one of the details he kind of left yto your imagination... That small bend should not be a problem. If you do laminate, use a 1/8th inch notched trowel to spread adhesive, place the two together firmly on a flat surface using another thicker flat surface on top to apply some pressure, then wiggle the two pieces back and forth a little. Apply the two pieces at one time without taking apart again. Well, what I was actually asking is if I could laminate the two pieces to take the curve in the wing. I realise this is basic stuff for a lot of you guyus, but I've never bent realatively thick ply before and I don't want to make a mess out of the rest of the wing trying.. |
#4
|
|||
|
|||
Wing walk ply question.
"Mustardbuilder" wrote Well, what I was actually asking is if I could laminate the two pieces to take the curve in the wing. I realise this is basic stuff for a lot of you guyus, but I've never bent realatively thick ply before and I don't want to make a mess out of the rest of the wing trying.. Reread what I said. That is how to laminate two, without a mold. One should work, though, no problem |
#5
|
|||
|
|||
Wing walk ply question.
"Morgans" wrote in news:cZIrh.1221$cZ1.187
@newsfe04.lga: "Mustardbuilder" wrote Well, what I was actually asking is if I could laminate the two pieces to take the curve in the wing. I realise this is basic stuff for a lot of you guyus, but I've never bent realatively thick ply before and I don't want to make a mess out of the rest of the wing trying.. Reread what I said. That is how to laminate two, without a mold. One should work, though, no problem Dunno, that's what I was asking. I've laminated two pieces of ply together before, just was wondering if it was practical or advisable to do it curved. |
#6
|
|||
|
|||
Wing walk ply question.
"Mustardbuilder" wrote Dunno, that's what I was asking. I've laminated two pieces of ply together before, just was wondering if it was practical or advisable to do it curved. I would be very surprised if your one ply of 1/4" ply would not conform to the curve you need. Astonished, even! g Don't forget that the curve is part of what gives that thin of a piece of plywood the ability to carry your weight. Is there any other structure to help out? Extra stringers, or anything? I would think there should be no more than 6" to a stronger structure as you measure parallel to the grain of the ply face, and perhaps 9 or 10 inches between supports as measured across the grain. Are those types of numbers close to what all of you other wooden homebuilders have found in your plans? I am going with these types of numbers based upon my knowledge of being a woodworker. I am curious if that is what others have found. -- Jim in NC |
#7
|
|||
|
|||
Wing walk ply question.
Mustardbuilder wrote: "Morgans" wrote in news:cZIrh.1221$cZ1.187 @newsfe04.lga: "Mustardbuilder" wrote Well, what I was actually asking is if I could laminate the two pieces to take the curve in the wing. I realise this is basic stuff for a lot of you guyus, but I've never bent realatively thick ply before and I don't want to make a mess out of the rest of the wing trying.. Reread what I said. That is how to laminate two, without a mold. One should work, though, no problem Dunno, that's what I was asking. I've laminated two pieces of ply together before, just was wondering if it was practical or advisable to do it curved. Laminating a curved piece is, if anything, better than laminating a flat piece, and also better than using a single piece. If you laminate it on the curve before the glue sets the laminated plywood will be pre-stressed to the desired curve. You don't need a mold, you can attach one piece, let it set, then glue the second piece over it. Regarding the veneers, the laminated piece should be symetrical. If the pieces have an A and a B face, they should be laminated ABBA or BAAB, not ABAB or BABA. The grain on the new front and back face should be parallel. I'd put the A faces out, ABBA. But I think aircraft and marine plywood is supposed to have A-grade veneers front and back, right? -- FF |
#8
|
|||
|
|||
Wing walk ply question.
Mine also calls for 1/4" but only from the front spar to the back spar, since I have flaps. Laminating 2 peices should be ok but I wouldn't us an 1/8" trowel. I would spred the glue around with a popsicle stick or scrap wood, quite a few clamps, and straps of wood to put on top. Clamp one end, then start clamping every couple of inches until you reach the other end. Lou |
#9
|
|||
|
|||
Wing walk ply question.
1/4" ply will bend more easily if you orient the grain across the bend instead of along it. The grain should be parallel to the spars. If it's 1/4" birch ply, that would seem a lot of overkill for a wingwalk. If it's 1/4" pine or fir, it should bend without any problem. My son and I finished a small boat last year, using 1/4" Chilean Pine plywood, and we put some impressive curves in it. See this picture of an identical boat: http://www.glen-l.com/designs/outboard/dsn-sqtd.html Dan |
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Good news for private pilots' spouses | Skylune | Piloting | 30 | July 7th 06 11:19 PM |
Wing dihedral | Dallas | Piloting | 35 | March 20th 06 04:01 PM |
The Impossibility of Flying Heavy Aircraft Without Training | Immanuel Goldstein | Piloting | 365 | March 16th 06 01:15 AM |
The Impossibility of Flying Heavy Aircraft Without Training | Immanuel Goldstein | Home Built | 331 | March 10th 06 01:07 AM |
An Affordable Homebrue 60 in DS machine | Grant | Soaring | 0 | August 8th 03 03:52 AM |