A 1974 design by Teledyne Ryan for a stealthy remotely piloted vehicle While the general shape is certainly well within the norm for stealthy craft, the structure itself is quite different: it is basically a metal vehicle optimized for stealth, wrapped in a radar-transparent plastic skin optimized for aerodynamics. The only aspect of it that really seems to fail modern stealthy practices is the apparent straight shot in to the turbine face. From the Jay Miller collection.

The technology behind this was patented by Teledyne Ryan:

Aircraft of low observability

CORRECTION: This was originally posted as a TRW design, when in fact it was a Teledyne Ryan design. D’oh.