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Thread: Norm's Flying Boat UL Flight Test Progress

  1. #151
    Norman Langlois's Avatar
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    Waiting on supplies. Name:  20180804_162717.jpg
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Size:  92.1 KB The latest stats I have the core down to 9 lbs 10 oz. and the ruder pedals to 4 lbs. 3 oz. after removing unnecessary metal tube and drilling weight reduction holes. I also cut the cockpit cavity deeper. I like my pedals and there is need for weight forward as long as I stay on track they will be part of the new setup.

  2. #152
    Norman Langlois's Avatar
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    After acquiring needed supplies. I did a vacuum bag peel ply using Kevlar . I was not set up for vacuum bagging so I had to get innovative. I had sat in on a carbon fiber forum .I Took note of the fine points. Since I was not about to go out and buy a vacuum pump as recommended [ diaphragm ] type . I used the suggested cheap path . A small venturi device and my compressor a 6.0 scfm at 90 psi system. The veturi device are sold by many sources. From $190.00 down to $32. If you know what you are looking at. The little black block in the pictures shown of said device is very little indeed about 1/2 inch thick 1 X 1 1/2 inch .Its small but very powerful. those shown have a muffler attached . If you want to use a venturi do this just type AIR -VAC you will understand after looking around a bit what I mean. I went further , but by the time I was through buying many brass fittings for my multi device . I chose to run a dual system with gate valves. Using not just the venturi but also the intake of my compressor. I had spent over $150 bucks on bits and pieces. But it worked. Even better than I could hope for. The intake side of the compressor is a high volume reduction while the little venturi is strong at 27.5 it is low volume and very slow for a large bag. with both turned on it took only a minute or 3 to suck it down tight. Baring the many leaks from folds after enough tape. I did the layup in 4 stages the socket, the cabin, the forward deck and last the entire bottom and transom
    Each the resin to foam the kevlar. then work on the polyester fabric. next the polyester fiber fill [sponge] this sponges up the excess. I did by one of the best vacuum bagging material its very elastic and has good memory also reusable the tape pulls of the resin and other stick points. I also used a double sided bagging tape . When I needed direct to a former layup .I had found that applying the tape to the foam caused to much damage. In the beginning I Had purchased a $44. sheet of poplar ply 4X8 sheet for a vacuum table. This saved me alot of expensive double tape I just used blue painters tape, taping the bag directly to the wood. Name:  127_0231.jpg
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  3. #153
    Norman Langlois's Avatar
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    After all the kevlar and resin applied the weight is only 16.8 Lbs. Had I used the high density foam it wold be 26.6 Lb
    It is hoped that by using a full kevlar jacket I will have the strength of an otherwise glass and kevlar composite. Like the old hull. Name:  127_0236.jpg
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  4. #154
    robert l's Avatar
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    Are there any structural features inside the foam or does the Kevlar provide all the strength needed ?
    Bob

  5. #155
    Norman Langlois's Avatar
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    Hi Bob
    No there is no additional structures . The form shape contours and cockpit galley walls are about all there is. Better than a flat stress skin . With kevlar I certainly hope its enough . The 281 bi directional plain weave is strong stuff. I expect I will be adding a 3"wide perimeter layer on the top to bottom overlay. I think that will be all.

  6. #156
    robert l's Avatar
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    I've never done any composite stuff so that's the reason I was asking. I would like to try it someday and getting feed back from those who have done it, (like you) is a big help. I'll be lurking around.
    Thanks,
    Bob

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