Tophe said:
Several twin-hull versions have also been considered, as far as I know.
Dear Ucon sent me a picture of the twin-hull 7-engined Hughes Model HK-1 (I do not post it here, maybe this is copyrighted, I let Ucon do it maybe). He required more about it. My scanner is in a jam, but here what is in my database:
- Aeroplane Spotter Volume IV Nr 93 page 218 : drawing of Concept Nr 2 Kaiser-Hughes HK-1 Liberty
- Howard Hughes and his Hercules pages 34-35 : drawings of Nr 2 and 3 (the 4-5-6-7 being single-hull, the last ones being renamed H-4 Swoose Goose
- project of 1942 (or 1943) with 6 or 7 engines depending on the versions, forefather of the final 8-engined H-4, 5000 copies considered then 3 ordered (single hull chosen), 2 cancelled
- mentioned also in Macchine Bizzare del aviazione, Source Book of WW2, Aeroplane Spotter Nr 98.