Where did the RR engines go?

S! All, a simple question:
When De Havilland designed the DH4 it was originally meant to carry a Rolls Royce engine.
Apparently these were not available and the airframe had to be altered to take a lesser Royal Aircraft Factory engine, which lowered the performance of this light bomber.
So where, or in which aircraft(s), were the Rolls Royce engines employed?

[leo]

The RR engines were probably the best for heavier aircraft, but the production capacity was not up to demand. Other engines were tried in the DH4, but noe proved to perfrom as well. FIAT A12 260 HP, RAF 200HP v12, Napier 400 HP, BHP 200 HP,Galloway Adriatic, Puma, and renault were some of the engines tried. None performed as well.

[Cigogne]

But they still provided adequate performance over the other British two-seat types then in service.

[Lufbery]

I'd always read that the DH4 really came into its own with the American Liberty engine. What do you guys think?

Regards,

[leo]

The Americans always maintained that the Liberty was the best engine for the DH4, but the British claimed the 375 HP RR outperformed it.

The DH4's potential for self-defense was certainly improved by placing the pilot behind the main fuel tank and thus closer to the observer - which was one of the reasons for the development of the DH9 - but the Liberty was a heavy engine, and it seems that fitting such provided little if any improvement in performance over the R-R Eagle-powered originals.

The post-war U.S. DH4 was a great aircraft that served America proud, particularly the metal-framed variants - but no Liberty-powered examples flew on operations over the Western Front before the Armistice, as far as I know.

And the cock-up that was the attempt at building Liberty-powered Bristol F2B Fighters in the 'States - aaaaaaaargh!

R-R Eagle engines were employed in the DH4, Handley Page 0/400 and Felixstowe F2A flying boats, amongst others; generally, 'heavyweight' types that demanded reliable and high power according to the standards of the day. And it did well early-post-war too - cheers!

(8;¬)}

Simba.

[Dan_San_Abbott]

Jolly:
Rolls-Royce lacked the productive capacity to produce the RR Falcons and RR Eagles in demand by the the Air Ministry for the production of Aircraft. Rolls-Royce was threatened by the Air Ministry to set up license builders, and RR refused, on the grounds that the RR quality could not be met. RR were essentially making one hand built engine at-a-time! The Air Ministry looked to other manufacturers to come up with comparable engines. The 400hp Liberty V-12 looked like the solution to their problem, and the US managed to screw that up. The 320 hp ABC radial was a solution, it fell in the crack, The two engines that had the potential were not developed, the Armstrong-Siddeley Jaguar and Cosmos 400 hp Jupiter. Both were set aside and developed in the early 1920s. Siddeley-Deasy developed the 600hp V-12 "Tiger" and Galloway the V-12 500hp "Atlantic". None of these came to pass during the war, my opinion is too many hands in the pot and not enough effort on what was working!
Blue skies
Dan-San