Like cursed penguins, a whole barrage of helicopter designs has failed to make it. From advanced stealth helicopters that cost billions, to sleek gunships and vast flying cranes that proved too much, ...

Click to open image viewer. CC0 Usage Conditions ApplyClick for more information. Larry Bell gambled that a thriving market for personal helicopters would develop after World War II. If he could ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Two printed illustrations of airplane ...