Red pipes: 1. Trident shaped letter (3) 3. Curvy (with shaped) (1) 6. Sacrament, perhaps (8) 7. Bug (6) 10. iBoss (4) 11. VW rival (2) 13. Scram (4) 17. Waiting ladies to Queen Isabella (7) 18. Jr. (2) 19. Conservative think tank (abbr.) (3) 20. He yis what he yis (6) 24. Jorge's (3) 25. A drop of golden sun (2) 26. Spielberg film (2) 27. Pivot around an axis (4) 28. Top mark (1)

Black pipes: 1. Symbol celebrated on March 14 (2) 2. Incision (4) 4. Give out (6) 5. Einstein's theory (abbr.) (2) 6. Join (5) 8. Nice jewel (5) 9. Morning (abbr.) (2) 12. It is 12cm in diam. (2) 14. Finishes rough or round (5) 15. Hurry (3) 16. Dangerous word to call your brother,       according to the sermon on the mount (4) 18. Lazy (8) 20. Like this puzzle (alt. sp.) (5) 21. Simple logic gate (2) 22. It follows horse, cow, pig, dog, etc. (5) 23. Party on the big island (4) 26. Guild member (8)