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Across 4. the front of an aircraft 6. rule that prevents knife cuts 8. study of aircraft flight and design 11. an unpowered aeroplane 15. Special shape of a wing which produces lift 17. the force that pulls an aeroplane down 18. shape which reduces drag 21. When the nose of the plane dips down 22. you add weight to the nose to achieve this

Down 1. wings have two distinct angle changes 2. Connects wings with tail 3. A force produced by a low pressure area on top of a wing 5. A light , soft wood 7. wings angled above wings 9. Keeps the plane flying straight and level 10. displays a retractable blade 12. Keeps the plane flying in a straight line 13. strong anf fast setting adhesive 14. used to remove fine pieces of balsa 16. When the plane climbs too steeply and fails to fly 19. tthe force which slow an aeroplane down 20. Produces lift