ok im going to be building a GP pt-40 here pretty soon and ive been doing alot of resarch on different building methods etc. and i got one question. When im building the wing on the pt the wing all fits together so you can check it before you glue it right. so how should i glue it together should i put it all together and then put thin ca on all the joints. and let dry or should i start with one piece and start gluinging things together piece by piece slowly building it up. if this is confusing im sorry but i think the advanced modelers who im asking should get it, i hope.

You can use thin CA on joints that are tight, balsa joints (balsa to balsa). If you have ANY plywood or hardwood, you must use a medium CA, since plywood is too porous for thin to work right. I myself would frame it all up for alignment sake, then rebuild it using a yellow wood glue. If the joints are tight, you will not use much glue, and you will have time to get things set up correctly. CA hasn't much of a time window... A lot of builders use wood glue (aliphatic) and have great results. As an aside, it's WAY cheaper. It's been argued that yellow glue is also more flexible whereas CA is more brittle. Hope this helps.

Put the wing together on your board, carefully aligning everything and pinning each piece as you go, until all the ribs and spar , bottom sheeting is assembled dry and lined up, and FLAT, and then start at one end and use fast Ca on each and every joint, then go back and use medium on the spar, shear webs and wherever a rib joins the spar. then do your leading edge and top sheeting (or just follow the directions for specific order). Then you can unpin the wing, should have a nice, straight, strong wing.

If you plan to CA the wing on the PT, you assemble the wing panel almost completely then wick thin CA into the joints. This is thoroughly described in the instructions, pages 26 - 28. Some long tip extensions make it a lot easier to reach between the ribs and to control the flow of glue.

If you want to assemble the panels one part at a time, you'll need to use yellow wood glue. Even thick CA sets too fast for some joints; like the long web that goes in the slot in the spar.

Either way of dioing it would work fine. Did you use CA to build the tail and fuselage? If so, I recommend you follow the instructions for the wing. I built the PT-60 with CA, by the instructions, and the wing came out straight and strong. If you're building with wood glue, test fit eveything, disassemble, reassemble with glue.

Just a tip, if you are new to CA's, remember that CA does not like an acedic base which is what most hardwood and plywood are. To make a good CA joint on them, use some baking soda (like used in the kitchen) and very lightly dust the area to be glued with baking soda before adding the CA. Viola, instant and good joint but is nearly unsandable so do not leave any mounds of soda you would have to remove later. You will find baking soda to be one of your necessary aids if you use much CA.

thanks carrellh and khodges that answered my question perfectly. so get the wing together and siting pinned on the table, then wick thin CA in the joints, sounds like a plan. you see the reason im asking this is awile ago when i was like 10 my parents bought me a pt-40 to build and when i did the wing i just used medium CA and glued each part individualy like you would with wood glue. the model only got half finished and is sittting in my room right now and is kind of messed up from being in storage so long. im 16 now and want to start over and do it the right way. so thanks for the input and answering my question.

You'll really like the PT-40 when it is finished. Several have flown at our field and they fly really well. My PT-60 is very similar, just bigger.

You'll notice in the manual that they describe two ways to build the wing. This is on page 4. If you will have an instructor when you start flying, you should build the "B" version of the wing. The "A" version has so much dihedral angle that the wings look very much like a flying "V". In the least bit of crosswind when taking off or landing, the plane tries to turn over. The "B wing" handles wind much better.

I built the "B" wing and my plane is great. It's very stable but will also do basic aerobatics easily. The manual almost makes the B wing sound scary, but it's nothing to be afraid of. One of our club members built a PT-40 with the A wing. He bought a wing kit and built a B wing after two trips to the field because the A wing couldn't handle the winds we were having this summer.