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More holes than filling but here's a start on De Schelde designations. Can anyone fill gaps or add other designations?
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De Schelde Aircraft Designations
De Schelde inherited staff and designs when it took over the failed Pander & zonen firm. Both the services of chief designer Theodorus Slot and his as-yet-unbuilt designs were part of that deal. Thus, from Pander, de Schelde took on the 'S' (for T.E. Slot) designation style as well as a construction number sequence. As a result, the very first aircraft designed at de Schelde - the S.12 monoplane prototype - was assigned c/n 48.
Although Theo Slot designed the unfortunate S.12, it is not clear whether 'S' still stood for Slot at that time ... or if it simply stood for 'Schelde'.
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De Schelde 'S' Series Aircraft Designations
De Schelde S.1 - (Project) Pander twin-boomed commercial a/c, 6-engined
De Schelde S.2 - (Project) Pander commercial a/c, 4 x pusher engines
De Schelde S.3 - (Project) Pander commercial a/c, three-engined, high wing
De Schelde S.4 - (Project) Militair long range recce/medium bomber
- S.4: Recce-bomber deriv. of Slot's Pander S.4 Postjager mailplane
-- https://www.secretprojects.co.uk/th...aft-projects-and-prototypes.5276/#post-222783
De Schelde S.5 - S.7 - (??)
De Schelde S.8 - (Project) 1935 low-winged monoplane airliner
- S.8: Probably intended as medium type for KLM's NEI routes
- S.8: 2 x 620 hp Junkers Jumo 205 diesels;* span (??) m
- S.8: Vague resemblance to Douglas DC-2; retract. main u/c
-- * With alternative radial engines proposed (type unknown)
De Schelde S.9 - S.11 - (??)
De Schelde S.12 - 1935 3-/4-seat,* low-winged cabin aircraft; x 1
- S.12: Slender fuselaged monoplane w/ trousered main u/c legs
- S.12: 1 x 130 hp DH Gipsy Major inverted 4-cyl.; span (??)
- S.12: Theo Slot design for Klaas de Geus van den Heuvel [2]
- S.12: Proved seriously overweight but was accepted anyway [3]
-- * Seating may have been reduced to allow for weight gain
De Schelde S.13 - S.18 - (??)
De Schelde S.19 - (Project) Twin-engined, 4-seat 'jachtkruiser'*
- S.19: Twin-boomed; mid-placed wings; metal constr.; tricycle u/c
-- * Jachtkruisers were bomber-sized multi-seat heavy fighters
De Schelde S.20 - 1940 twin-boomed pusher cabin monoplane; x 1
- S.20: 4-seater (1+3) sports a/c; mixed constr.; retr. tricycle u/c
- S.20: 1 x 160 hp Hirth HM 506A inverted 6-cyl.; span 11.35 m
- S.20: (As flown) metal booms; plywood-covered wooden wings
- S.20: (Planned) production aircraft to have metal wing constr.
De Schelde S.21 - (Project) Single-seat, twin-boomed fighter; x 1*
- S.21: Low-winged; twin-boomed; pusher-propeller; tricycle u/c
- S.21: 1 x 1,085 hp Daimler-Benz DB600G IV-12; span 9.00 m
- S.21: Highly-glazed cockpit w/ flexibly-mounted Madsen 23 mm
-- * Prototype constr. near complete in May 1940; seized by DE
-- https://www.secretprojects.co.uk/threads/de-schelde-s-21-fighter.7327/
De Schelde S.22 - (Project) Single-seat, twin-boomed fighter a/c
- S.22: High-winged S.21 alternative to 1938 fighter specification
- S.22: 1 x 1,030 hp Rolls-Royce Merlin II pusher; span (??) m
- S.22: Nose flex cannon; 2 x cannons in wings; 2 x 7.9 mm mgs
De Schelde S.23 - (??)
De Schelde S.24 - (Project) 2-seat recce aircraft; related to S.22
- S.24: High-winged; pusher propeller; no other details (??)
- S.24: 1 x 650 hp Isotta Fraschini Asso 120 IRCC.40; span (??)
De Schelde S.25 - (Project) 2-seat 'combat' aircraft (recce type?)
- S.25: Gull winged; twin-boomed (?); pusher propeller
- S.25: 1 x 650 hp Isotta Fraschini Asso 120 IRCC.40; span (??)
De Schelde S.26 - (Project) Ontwerp 75; 50-pax airliner concept for KLM
- S.26: Twin-boomed airframe; 6 x pusher-props; engine type unknown
-- https://www.secretprojects.co.uk/attachments/de-schelde-s-26-jpg.132791/
De Schelde S.27 - (Project) Poss. Ontwerp 76 4-engined mailplane [4]
-- Ontwerp 76: Long-range mailplane for KLM (planned route unknown)
De Schelde S.28 - (Project) No details (??)
De Schelde S.29 - S.31 - (??)
De Schelde S.32 - (Project) Dive bomber; no details (??)
De Schelde S.33 - (Project) Single-engined, single-seat racing aircraft
- S.33: Elsewhere said to be high-speed mailplane; no other details (??)
_________________________________________________
[2] Along with his brother Bas, Klaas de Geus van den Heuvel was an Amsterdam construction magnate. While the older brother became better-known for his art collection, Klaas became known as a sport aviator.
[3] The S.12 was built at the Bedrijfsschool, Vlissingen. Some sources say that the wooden wing structure was weakened by poor construction practices. As a result of this (or just of being overweight), the S.12 was incapable of carrying passengers. Nonetheless, Klaas de Geus van den Heuvel took delivery of the aircraft which he registered (for his initials) as PH-KGH.
[4] The connect between the designation S.27 and Ontwerp 76 is speculative. Ontwerp 76 was the first of four submissions for KLM's South Atlantic airmail route to Paramaribo in Suriname. It had a span of 24.00 m; 4 x Junkers Jumo 205 diesels; and carried 4 passengers + mail. Another submission was a trimotor with 3 x 1,000 hp Wright Cyclones, resembling an enlarged, mid-winged Pander Postjager.
________________________________________________________
De Schelde Aircraft Designations
De Schelde inherited staff and designs when it took over the failed Pander & zonen firm. Both the services of chief designer Theodorus Slot and his as-yet-unbuilt designs were part of that deal. Thus, from Pander, de Schelde took on the 'S' (for T.E. Slot) designation style as well as a construction number sequence. As a result, the very first aircraft designed at de Schelde - the S.12 monoplane prototype - was assigned c/n 48.
Although Theo Slot designed the unfortunate S.12, it is not clear whether 'S' still stood for Slot at that time ... or if it simply stood for 'Schelde'.
_________________________________________________
De Schelde 'S' Series Aircraft Designations
De Schelde S.1 - (Project) Pander twin-boomed commercial a/c, 6-engined
De Schelde S.2 - (Project) Pander commercial a/c, 4 x pusher engines
De Schelde S.3 - (Project) Pander commercial a/c, three-engined, high wing
De Schelde S.4 - (Project) Militair long range recce/medium bomber
- S.4: Recce-bomber deriv. of Slot's Pander S.4 Postjager mailplane
-- https://www.secretprojects.co.uk/th...aft-projects-and-prototypes.5276/#post-222783
De Schelde S.5 - S.7 - (??)
De Schelde S.8 - (Project) 1935 low-winged monoplane airliner
- S.8: Probably intended as medium type for KLM's NEI routes
- S.8: 2 x 620 hp Junkers Jumo 205 diesels;* span (??) m
- S.8: Vague resemblance to Douglas DC-2; retract. main u/c
-- * With alternative radial engines proposed (type unknown)
De Schelde S.9 - S.11 - (??)
De Schelde S.12 - 1935 3-/4-seat,* low-winged cabin aircraft; x 1
- S.12: Slender fuselaged monoplane w/ trousered main u/c legs
- S.12: 1 x 130 hp DH Gipsy Major inverted 4-cyl.; span (??)
- S.12: Theo Slot design for Klaas de Geus van den Heuvel [2]
- S.12: Proved seriously overweight but was accepted anyway [3]
-- * Seating may have been reduced to allow for weight gain
De Schelde S.13 - S.18 - (??)
De Schelde S.19 - (Project) Twin-engined, 4-seat 'jachtkruiser'*
- S.19: Twin-boomed; mid-placed wings; metal constr.; tricycle u/c
-- * Jachtkruisers were bomber-sized multi-seat heavy fighters
De Schelde S.20 - 1940 twin-boomed pusher cabin monoplane; x 1
- S.20: 4-seater (1+3) sports a/c; mixed constr.; retr. tricycle u/c
- S.20: 1 x 160 hp Hirth HM 506A inverted 6-cyl.; span 11.35 m
- S.20: (As flown) metal booms; plywood-covered wooden wings
- S.20: (Planned) production aircraft to have metal wing constr.
De Schelde S.21 - (Project) Single-seat, twin-boomed fighter; x 1*
- S.21: Low-winged; twin-boomed; pusher-propeller; tricycle u/c
- S.21: 1 x 1,085 hp Daimler-Benz DB600G IV-12; span 9.00 m
- S.21: Highly-glazed cockpit w/ flexibly-mounted Madsen 23 mm
-- * Prototype constr. near complete in May 1940; seized by DE
-- https://www.secretprojects.co.uk/threads/de-schelde-s-21-fighter.7327/
De Schelde S.22 - (Project) Single-seat, twin-boomed fighter a/c
- S.22: High-winged S.21 alternative to 1938 fighter specification
- S.22: 1 x 1,030 hp Rolls-Royce Merlin II pusher; span (??) m
- S.22: Nose flex cannon; 2 x cannons in wings; 2 x 7.9 mm mgs
De Schelde S.23 - (??)
De Schelde S.24 - (Project) 2-seat recce aircraft; related to S.22
- S.24: High-winged; pusher propeller; no other details (??)
- S.24: 1 x 650 hp Isotta Fraschini Asso 120 IRCC.40; span (??)
De Schelde S.25 - (Project) 2-seat 'combat' aircraft (recce type?)
- S.25: Gull winged; twin-boomed (?); pusher propeller
- S.25: 1 x 650 hp Isotta Fraschini Asso 120 IRCC.40; span (??)
De Schelde S.26 - (Project) Ontwerp 75; 50-pax airliner concept for KLM
- S.26: Twin-boomed airframe; 6 x pusher-props; engine type unknown
-- https://www.secretprojects.co.uk/attachments/de-schelde-s-26-jpg.132791/
De Schelde S.27 - (Project) Poss. Ontwerp 76 4-engined mailplane [4]
-- Ontwerp 76: Long-range mailplane for KLM (planned route unknown)
De Schelde S.28 - (Project) No details (??)
De Schelde S.29 - S.31 - (??)
De Schelde S.32 - (Project) Dive bomber; no details (??)
De Schelde S.33 - (Project) Single-engined, single-seat racing aircraft
- S.33: Elsewhere said to be high-speed mailplane; no other details (??)
_________________________________________________
[2] Along with his brother Bas, Klaas de Geus van den Heuvel was an Amsterdam construction magnate. While the older brother became better-known for his art collection, Klaas became known as a sport aviator.
[3] The S.12 was built at the Bedrijfsschool, Vlissingen. Some sources say that the wooden wing structure was weakened by poor construction practices. As a result of this (or just of being overweight), the S.12 was incapable of carrying passengers. Nonetheless, Klaas de Geus van den Heuvel took delivery of the aircraft which he registered (for his initials) as PH-KGH.
[4] The connect between the designation S.27 and Ontwerp 76 is speculative. Ontwerp 76 was the first of four submissions for KLM's South Atlantic airmail route to Paramaribo in Suriname. It had a span of 24.00 m; 4 x Junkers Jumo 205 diesels; and carried 4 passengers + mail. Another submission was a trimotor with 3 x 1,000 hp Wright Cyclones, resembling an enlarged, mid-winged Pander Postjager.
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