Unbuilt projects

They did not fly, but they might inspire

Delanne DL 70

3view of 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

Delanne DL 150, a twin-engined bomber.

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

Delanne DL 160, based on the C10 design.

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???


Clearly intended as passenger airplane. A pusher prop which makes the pilot have a good vision for a steep but slow descent towards the airstrip.
Note that there are ailerons in both set of wings.


I only found these two drawings of this jet. 

Westfield Delanne F124T

Westfield (the firm that also made the tandemwinged Lysander) proposed another Delanne inspired rocket powered airplane. It was their plan B for this requirement of the UK Air Ministry. Plan A had a normal wing platform.