Unbuilt projects
No no ...not a bi-plane!
Delanne DL 70

Intended as transatlantic flying-boat
To compete with S.N.C.A.S.E. 200, Latécoère 631 and CAMS-Potez
161
Two decks with luxury cabins for 52 passengers
Extra facilities: saloon, dining room, bar, kitchen, rest-room for
crew of 8.
- 6 x 1500 HP engines
- Double flaps in front wing
- Weight: 54 000 kg
- Estimated speed: 500 km/h (310 mph)
Brian Ward comments the DL70: "I don't think this could ever
have been a serious suggestion. If Delanne had seen a real flying
boat take off, he would have realized that the rear wing of this
design would have been damaged or ripped off very quickly by the
huge amounts of spray. Flying boat designers always make great
efforts to get their lifting surfaces as far above the water as
possible. In fact, it would have made a lot more sense to
have the forward wing mounted low to benefit from "ground" effect
and in front of the plume of spray, and the rear wing at the top of
the fuselage out of harms way. Engines mounted on the rear wing, of
course."
I am wondering again. Did M. H. Delanne adjust the hull of this
flying boat to reduce the spray? Did he keep the mentioned problem
in mind?
Delanne DL 150

Intended as five-seater. Later (1939) changed into crew of
four.
- Total weight 14000 kg
- wingarea 88,7 m2 (954 sq ft)
- 2 x 1580 HP
- Climb to 5000 m (16 404 ft) in 10 min 6 s (estimated)
- Top speed 500 km/h (311 mph) (estimated)
Delanne DL 160

Improved view by placing the pilot in front of the front wing.
- 2 x Hispano 12 Y-89ter engines drive twin contra-rotating
props.
- At 5500 m height (18,044 ft) in 4 min 35 s.
- Estimated top speed 775 km/h (482 mph)
- Probably also double flaps (was not mentioned in article in Air
Pictorial)
- Slots in front wing???