You have to have the answer to another question too. How many layers do I need for handling. Another I have discovered is how much time out of the heat(curing is done at elevated temperature) before I can handle the product. Then you need to consider the bushes and the weeds on the front edge and will the ailerons and flaps be stiff enough. Having mouthed off this far I have discovered that brown Kraft paper 60 pound will work with a spar to quite a high load. But the white paper that weighs almost the same is all fillers and has no strength. I usually pick the front up with two inch wide bias cut boat cloth (6 ounce). In addition the roots will need a band to transfer the load of the joiner. But I am always poking the wing tip into something so I add a small square at the very tip to pick up that area too. This is from the school of hard knocks. But given three layers the tradition has been a full layer to the tip. A second layer to the half and a third layer to the quarter . But since the load rises exponentially at the root we probably should do thirds. With the second layer to one third and the third layer to one sixth.. Then you start saying but this stuff costs so why don't I put it where it does the most good and you start using triangle shapes instead of full covering. Next you beat your head on the wall and say but if I used a spar I could cut down even more. At this point you would be trading your time for the cost Next point of confusion is shall I make the wing two or three piece. Two piece is easier but not as easy to transport. Ever try to get a 3m one piece to the field and back. I was forced to a three piece wing though a truck accident. Newer truck could only be the short one. You can't even put in a one piece 2m. AW!! but the benefits. We discovered at the same time the Conteco guncases at Wal-Mart and now design all planes to fit in these cases. Planes last a lot longer with less hanger rash. But now what shall the lay-up be. Haven't a clue. So I used the typical spar I was using with the pass of heavy cloth at the middle of the mid section to cover the wing hold down dowels and then another Band-Aid at both sides of the two joints. By the way when handling the heavy cloth cut it at forty-five degrees to prevent a raveling mess. Wasteful but much easier. Now isn't this a confused mess of an answer to a simple question!! Rick ------------------------------ "Date: Tue, 11 Jan 2000 18:44:48 EST From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Bias layup schedule question.... Message-ID: <[EMAIL PROTECTED]> To make sure I am understanding correctly - When laying up glass cloth on a bias (bagged wing) does this mean the cloth orientation is 45 degrees to the span? If using three layers of cloth per skin (top and bottom) what would be the strongest layup schedule in simple terms? TIA, Bill Gillis Reno, NV" RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
