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The benefit of the long root blade that Haworth had fitted to the Dart was that, not only did the thermal cyclic stresses reduce, the disc rim temperature profile was so much lower that ferritic steels could be used instead of austenitic steels. The Americans were very slow to adopt the innovation choosing instead to pour money into the manufacture of austenitic and nickel based discs. Incidentally the rim temperatures on the Concorde engine exceeded the limits for ferritic materials and we had to use American Waspalloy material for any practicable design.Another benefit of the long root blade is that a large radius at the top of the firtree greatly reduces the stress concentration at this point eliminating frequent failures that were happening in that area on conventional blades.
The benefit of the long root blade that Haworth had fitted to the Dart was that, not only did the thermal cyclic stresses reduce, the disc rim temperature profile was so much lower that ferritic steels could be used instead of austenitic steels. The Americans were very slow to adopt the innovation choosing instead to pour money into the manufacture of austenitic and nickel based discs. Incidentally the rim temperatures on the Concorde engine exceeded the limits for ferritic materials and we had to use American Waspalloy material for any practicable design.
Another benefit of the long root blade is that a large radius at the top of the firtree greatly reduces the stress concentration at this point eliminating frequent failures that were happening in that area on conventional blades.
