The F-15 that never was: The North American NA-335

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The USAF 1960s programme that led to the F-15 was won by McDonnell Douglas, but other fighter design houses had offered rival concepts. The most exciting of these unsuccessful designs was offered by North American, and was designated NA-335. In many ways its configuration resembled the later Sukhoi T-10. The Sukhoi T-10, after much modification, became the now ubiquitous ‘Flanker’ series. The American design differed in two significant ways: it lacked the gap between the engine nacelles, and it had only a single vertical fin. The ventral gully produces complicated airflows and can offer some separation issues for air-launched weapons, but it does allow the rear fuselage to add significantly to overall lifting area contributing to the fighter’s performance. The 335’s single-tail (backed up by large ventral fins) would have made the aircraft inferior to a twin-tailed aircraft like the F-15 in controllability at high alpha, but it would have been lighter and simpler. However, the ‘335s significant leading edge roots would have aided its ability to generate high alpha angles. Even with folding, it is harder to see how the large ventral fins would not necessitate a very tall stalky undercarriage.

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The sabre-shaped wings are particularly interesting – they feature similar wingtip curvature to the T-10, potentially causing issues at high transonic speeds and ruling out the use of tip-mounted missiles.

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3 comments

  1. duker

    Talk about just in time , I was commenting in the archives just the other day about the NA 335 and its cousin for what became the F-14 program, the NA-323. NA also had some preliminary designs for FX that were similar to MDD F15 but with a swing wing.
    Regarding the under fuselage fins, its likely that development would have switched to twin tails and residual fins. I understand it was only on the industrial side of the bid that led to NAA lose out, as they required a new plant ( which they did get for the B-1 at Palmdale) while MDD would just use the Phantom plant at St Louis.
    Sukhoi were supposed to be glad that MDD won too as they knew they were onto a winner with that wing configuration for the early Su27. History has shown they certainly could get a lot of different versions of the same basic design and the most recent version Su 35S was still very competitive.

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