Across
- 3. The Focke-Wulf Fw 61 was the first successful one in 1936 (10)
- 7. Ishmael and Isaac were his first two sons (7)
- 8. Joint English-French aircraft that went into service in 1976 (8)
- 12. 507 year-old clam accidentally killed by researchers in 2006 (4,3,7)
- 13. Capital of the Philippines prior to Manila (6,4)
- 14. Colour of a Welsh poppy (6)
- 17. Commercial name for calcium sulphate (7,2,5)
- 21. Played Mrs Barnes Wallis in 'The Dam Busters' (6,5)
Down
- 1. Second president of the USA (4,5)
- 2. Collective name for a group of zebras (4)
- 4. World's largest freshwater fish (8)
- 5. Robin Hood's fat monk friend (5,4)
- 6. Currency unit of Hungary (6)
- 9. Stared at his own reflection in a pond (9)
- 10. Babies are born without these (8)
- 11. Major constituent of ordinary air (8)
- 15. Most widely used of all solvents (5)
- 16. Crocus belongs to this family (4)
- 18. More generally known as skin (9)
- 19. Hardest natural substance in the world (7)
- 20. Queensland And Northern Territories Air Service (6)