Man, that's an arrogant statement for them to make. What about the P&W R2800? That powered the P-47 Thunderbolt, F4U Corsair and F6F Hellcat.
Or the P&W R1830s that powered B-24 Liberators, C-47 Dakotas (the DC-3), PBY Catalinas, and F4F Wildcats?
But it interesting that RR and P&W are still in competition today in the commercial airline engine market.
I feel a since of awe over that engine. I always will.