HoXVIII

If you have no luck with the RAE Archive try the National Archive where the report it came from (German Aircraft – New and Projected types. Dated January 1946) can be found as AIR 40/3129

Found it! Awaiting estimate for copying,thanks a lot!Hopefully some drawings to illustrate the description.

Plywood skin on the wing panels!:D IX was constructed similarly due to metal shortages.

aerofoil skin is 15-20 mm. thick.

Crumbs! Is there a decimal point missing?

Thanks again,another email winging it’s way 🙂

If you have no luck with the RAE Archive try the National Archive where the report it came from (German Aircraft – New and Projected types. Dated January 1946) can be found as AIR 40/3129

I’ve mailed RAE archives,hope they have more.

Thanks a lot aeronut,hadn’t come across that before.Do you have any info on the the source of these details,I assume some factory documents acquired post war?The control surface details are especially interesting,as I hope to build an rc model of this unique craft.
Regards S

This is what was written about by the RAE.
HORTEN XVIII TAILLESS LONG-RANGE BOMBER
A “flying-wing” with no vertical control surfaces, this design was produced to the same specification as the Ju-257 The wing is of arrowhead shape and the pilot’s compartment in the nose is covered by a “bubble” canopy The crew of four are provided with a pressure cabin. Four HeS 011 turbo- jet units are mounted in pairs underneath the wing.
An eight-wheel fixed undercarriage is fitted, the four wheels on either side being housed in a fairing which provides keel surface and also forms part of the twin turbo-jet nacelle. The outer wings are of wood and have a small dihedral angle. The control surfaces consisting of ailerons, “surface” flaps and spoilers are of light alloy. The centre-section is of composite construction,- either steel and .wood, or steel and light metal. Box main and auxiliary spars’ are employed, and the , aerofoil skin is 15-20 mm. thick.
Span 98.5 ft.
Wing area” 1680 sq. ft.,
Aspect’ ratio 5.8
‘Power plants 4 x HeS 011
Flying weight 73,000 lb. (82,600 lb., overload)
Fuel 33,000.lb.(41,700 l b overload)
Bomb load 8800 lb. , ( 4 x SC 1000)
Max.- speed (23,000 ft. ) 535 m.p.h.
Cruising speed 485 mph
Optimum range 3350 miles (4050 miles overload)
Take-off distance (6 x 2640 lb.).
thrust A.T.O. units) 3600 ft. . (5600 ft., overload)
10 x 2640 lb. thrust A.T.O. units) 2620 ft.,(2980 ft. Overload)

Rate of climb (sea level ). 1750 ft/min (1570 ft/min overload)
Landing speed 77.5 m.p.h.
Service celling (with bombs) 42,500 ft. ( 40;000 ft. overload)