| 11. | Preferred stock in shock absorber and piston ring maker Cia.
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| 12. | Piston ring failures and cylinder head sealing problems were experienced during early flight testing.
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| 13. | Three rather than four piston rings were fitted, and the engine balancing was improved.
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| 14. | These have Teflon piston rings, molybdenum cylinders, low-friction coefficient materials.
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| 15. | Gas sealing is achieved by the use of piston rings.
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| 16. | Most piston rings are made of a very hard and somewhat brittle cast iron.
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| 17. | For compression, the pistons have two piston rings which slots are cast into the piston.
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| 18. | Piston ring design has been identified as a problem.
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| 19. | Piston rings are not perfect seals : each has a gap to allow for expansion.
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| 20. | Hope said the decision was " bizarre " because Kolbenschmidt does not make piston rings.
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