Jart Build
These pages are a static 'How to' pages; you can join in the discussion at ModelFlying.co.uk| 1. Fuselage Template and ply sides |
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| I cut a template form the CAD drawing, and marked around it to produce 2 ply sided. Note the holes in the sides. The 2 shown are the le & TE points so I have a datum on each side. In addition there are 3 more holes i at the nose and 2 at the tail to help alignment when I join the fuselage sides together. |
| 2. Fuselage formers & sides |
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| Formers cut and snakes fitted, opted for snakes to keep as much wood in the formers for strength, the blus one is a Sulivan for the elevator and the 2 yellows are guides for the rudder closed loop. |
| 3. Fuselage Template and ply sides pulled together |
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| I used 24 hr Araldite epoxy, a) to give me time to position the parts in my fuselage jig (a home made version of the SLEC one) and b) There is no better glue if a high strength bond is required. |
| 4. Fuselage ply box waiting for balsa |
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| 1/16 ply tops and bottoms fitted and sanded. Waiting for the balsa sides now to shape, but if you squint, you can see a JART in there somewhere. |
| 5. Tailpalne |
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| Tailplane halves with the elevators cut and the edges faced with hard balsa. |
| 6. Wings |
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| The first image is one of the panels, it's blue foam glass covered and vac bagged, with Kevlar along the hinge ine for 'live' hinges. the middle is the ply aleron template, tapped into position. One the bottom of the wing I make 2 cuts to produce a 'vee' for the the donw going aileron, and the top I file through the skin down to the kevlar hinge. The final image shows the hinge line cut, care must be taken here not to cut through the kevlar hinge. |
| 7. Wing & servo box |
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| Top hinge line being filed and the bottom of the wing showing servo box, with a cubitts servo mount |
| 8. Wing & servo box |
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| Top hinge line being filed and the bottom of the wing showing servo box, with a cubitts servo mount |
| 9. Tail |
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| Tailpalne showing carbon rod, and clamping of tail whilst drying. |
| 10. Fuselage balsa planking |
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| The ply box is being planked with 9mm balsa, the majority of which will be shaped away to reveal the Jart. The balsa is stuck to the ply with epoxy skinning resin and 1oz glass cloth, and clampped until dry. Giving a ply / glass / balsa construction. Should be strong enough!!! |
| 11. Fuselage balsa planking |
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| Left hand showing the glass sandwich under clamp pressure. The other shows the top planking (this was 12mm as I had a length of scrap) shapped back to the fuselage side waiting to complete the planking. |
| 12. Fuselage balsa planking |
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| You need a lot of clamps, this is the canopy, previously cut out, it will be tacked back in place for final shaping and finishing, and released just prior to painting. |
| 13. Can you tell what it is yet |
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| It takes a lot of sanding to find the shape under all that basa. |
| 14. All ready for glassing |
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