caribeanbound
Well-Known Member
I am building a composite version of a High wing pusher design ( Janowski J1-B. I lengthened the tail 15 inches by splitting the fuse design down the middle and widening it by 10cm ( aprox 4in). I have built the bottom and sides of the fuse and assembled with bulkheads. I am now ready to close the tail cone section by adding the pre glassed top sections. I am trying to figure out exactly how to get the cant strips used on the bottom as longerons glassed with tapes onto the inside of the top?? Do I need to worry about this. Could I just epxy flox the preglassed panels on and glass over the outside. The assembly looks so overdone now that I suspect that I do not to worry about the upper corners having the glass taped cant strip. I am hoping for someone with experience to look at my design and offer an engineering solution. The original used a single 2mm play skin with 10mm sq. longerons. They also installed three simple box bulkheads with crosses to add torsional strenght. I used 3/4 foam with two layers of 7 1/2 oz bid layed on the interior of both the sides and the bottom . I them assembled the sides to the bottom with 3/4 inch foam cant strips in the corners and tabbed them with a 2in and then a 4in tape. The bottom glass runs to the outer skin. interior bulkheads were made up of foam and glass and tabbed to the bottom and sides with a floxed corner fillet and a single layer of 2in tape. I will be glassing the outside with at least one layer of 7 1/2 oz bid. This plane will have an empty weight around 350 pounds.
I think that it is more than strong enough at this point to just flox down the top panels and glass the outside. I made the top panels in three pieces and could probably (with much cursing make up the upper corners the same as the bottom. I could with much difficulty reach in through the lighteneng holes to do the work. What do you think, Stong enough by inspection???
There are three layers of 7 1/2 oz bid on both the bottom and sides back to the first tail cone bulkhead. I am not up the preverbial river at this point. I have found that if I stop to analyse things to much that nothing will ever get built. I am very cautiously charging ahead with the design and getting it built. Please just a little help without to much criticism.Although all opinions are welcome.Laughing is allowed and somewhat expected.
I think that it is more than strong enough at this point to just flox down the top panels and glass the outside. I made the top panels in three pieces and could probably (with much cursing make up the upper corners the same as the bottom. I could with much difficulty reach in through the lighteneng holes to do the work. What do you think, Stong enough by inspection???
There are three layers of 7 1/2 oz bid on both the bottom and sides back to the first tail cone bulkhead. I am not up the preverbial river at this point. I have found that if I stop to analyse things to much that nothing will ever get built. I am very cautiously charging ahead with the design and getting it built. Please just a little help without to much criticism.Although all opinions are welcome.Laughing is allowed and somewhat expected.
