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#1
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More boat-towed-glider WIG questions
After searching the literature the closest thing to what we (my
brother and I) want to build is called the "Aqua-Glider" which is made mostly out of wood. I thought we might copy the design but substitute materials. For the fuselage and tail we would use fibreglass/foam sandwich construction. Welded aircraft tubing for the tail section of the fuselage (my brother has a TIG welder). Having a tubular after body section (fuselage section behind the step) is a concern since usually on takeoff that section is the last to touch the water and also what one lands on, I've never seen a flying boat without one. For the wing I was planning on using a built up wing with sheet aluminium ribs with a wooded solid plywood or box spar. I was also thinking about using an aluminium tube spar rather than a wood spar but was unsure about how to connect it to the ribs? If one had a very soft Al one might be able to form a circular flange that the tube spar could slip into which could then be glued. Another way might be to attach a piece of wood to the rib (both with holes though them) and then glue the wood to the tube spar. Is their a better way to attach Al ribs to an Al tube spar? I know typically 2 or 3 layers of fibreglass are used for each side of the fuselage with .5"/10mm foam sandwiched in-between. I couldn't find a plan or information on using fibreglass sandwich construction for the hull of a flying boat as most seem to use moulded fibreglass construction or wood covered with fibreglass. Any ideas on the number of layers required? After reading a book about gliders and the high lift airfoils that the Germans used in the 20s and 30s and since takeoff and flight speeds are similar to the German gliders (around 25mph) I think I should probably use a high lift airfoil. Although the NACA4412 airfoil and thicker variations are very common on flying boats, I think most of them used flaps especially with the thicker airfoils. I want to build a simple wing without flaps. Since the following airfoils may be too aggressive and are done at a bit too high a Reynolds number (2.5 million compared to 1 million): http://www.kaiyipboxing.com/WIG/INDEX.HTM, does anyone have any suggestions on good airfoils to use or are some of those okay to use? I was also considering a Parasol type design for added stability. This would allow the usage of a lower shoulder for the fuselage and rather than mounting the engine in pusher configuration on the shoulder, the engine could be mounted onto the wing. The problem with the parasol is that I couldn't find any design for a parasol flying boat. I may have to buy multiple plans and try to combine the two. Also since the wing is so high, rather than tip floats I'll probably have to put outriggers on the sides of fuselage. Does anyone know of any plans that I could use/combine for this type of design? Brock |
#2
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More boat-towed-glider WIG questions
"durabol" wrote After searching the literature the closest thing to what we (my brother and I) want to build is called the "Aqua-Glider" which is made mostly out of wood. I thought we might copy the design but substitute materials. The last thing I want to do is to squash your dream, or to be mean. I have to be concerned with your plans from what questions you asked. I would respectfully ask if you should be planning to change a design. If you have to ask some of these questions, especially since some of the questions are very basic, you are not ready to take on redesigning. You should either build the plan as it is drawn, or spend a few more years learning before you start building. -- Jim in NC |
#3
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More boat-towed-glider WIG questions
Morgans wrote:
"durabol" wrote After searching the literature the closest thing to what we (my brother and I) want to build is called the "Aqua-Glider" which is made mostly out of wood. I thought we might copy the design but substitute materials. The last thing I want to do is to squash your dream, or to be mean. I have to be concerned with your plans from what questions you asked. I would respectfully ask if you should be planning to change a design. If you have to ask some of these questions, especially since some of the questions are very basic, you are not ready to take on redesigning. You should either build the plan as it is drawn, or spend a few more years learning before you start building. What Morg said... |
#4
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More boat-towed-glider WIG questions
On Jul 19, 12:32 am, durabol wrote:
After searching the literature the closest thing to what we (my brother and I) want to build is called the "Aqua-Glider" which is made mostly out of wood. I thought we might copy the design but substitute materials. I have a complete collection of the articles concerning the Aqua-0Glider, and a set of images concerning the extremely soimilar "Lawrence Glider" of about 1930. Send me a private note and I will e- mail this information to you directly. I was also considering a Parasol type design for added stability. If you do that, you're not building Aqua-Glider. If you insist on changing a design that works, I suggest you build a model of your idea and fly that for a complete summer. Keep records of every change you make, and take movies of all the tests. Mike |
#5
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More boat-towed-glider WIG questions
My question is why would you want an Aqua glider? You can't do much with it besides tow it along behind a boat at low altitude. There are so many other gliders that can soar for hours and miles. For boat towing you might as well get a parasail. |
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