Ambrosini S.7 / Super S.7 — Primary Factory Engineering Archive

Società Aeronautica Italiana (S.A.I.) — Passignano sul Trasimeno

What This Collection Is

This is the primary factory engineering archive of the Ambrosini S.7 and Super S.7 — the definitive Italian wooden racing and training aircraft of the early 1950s. It comprises 149+ original factory drawings, certification documents, and structural test records produced by Ing. A. Ambrosini & C., Società Aeronautica Italiana, between approximately 1948 and 1952.

This is not a reproduction. These are archival static-copy scans of the original Ufficio Tecnico (Technical Office) documents, many bearing Copia provvisoria (provisional copy) stamps, official SAI title blocks, and the signatures of the Ambrosini design team — including documents signed personally by B. Ambrosini.

The R.A.I. Certification Dossier — Registration No. 22.552/t

The most historically significant component of this collection is the complete Italian airworthiness certification dossier submitted to and approved by the Registro Aeronautico Italiano in February–March 1952. This includes:

• Fuselage Torsion Test — Carico sull'Impennaggio Verticale, Scale 1:20, 14-2-52, signed Ambrosini — bearing the official R.A.I. Approvato stamp (both the cancelled revision and the final approved version survive)
• Wing Static Load Test — Prova Statica per la Condizione di Portanza Massima, load factor 6.35, Scale 1:20, 1-2-52, signed Ambrosini — Peso Ala: Qa = 338 kg
• Fuselage Bending Static Test — Prova Statica a Flessione Diretta, load factor 11.820, Scale 1:20, 5-2-52, signed Ambrosini
• Fuselage Stiffness Test per ICAO Standards — Prova Modezza Norme I.C.A.O., with lateral bending and torsion formulae
• Vertical Tail Manoeuvre Conditions — Impennaggio Verticale — Condizioni di Manovra, Scale 1:5, 18-2-52 — bearing official Istituto Italiano Approvato il 10-2-52 — N° Collaudo 22.552/t stamp
• Airbrake Manoeuvre Test — Aletta Freno — Prova Condizioni di Manovra, Scale 1:5, 18-2-52 — bearing R.A.I. Arrivato il 10.3.52 — N° 22.552/t stamp
• Elevator Control Elastic Test — Prova Trasmissione Comando Timone di Quota — Ad Elasticità, Scale 1:20, 24-2-51
• Centre of Gravity Determination — Determinazione Baricentri ed Angolo di Seduta, Scale 1:20, 14-8-52, signed B. Ambrosini — full weight and balance table with all component masses, arms, and moments

Full-Scale Production Lofting Documents

• Wing half-span lofting No. 1 — Ambrosini Super 7 — Ala — Profilo, drawing No. 1027, Scale 1:1, signed B. Ambrosini
• Wing half-span lofting No. 2 — Ala — Profilo Radice, drawing No. 1018, Scale 1:1 — root profile
• Wing leading edge lofting — drawing No. 32/11, large format — master leading edge geometry with 6 spar cross-sections
• Wing planform construction — Costruzione Ala del Profilo, drawing No. 4-12, Super S.7 — 27 rib stations, leading edge radius geometry
• Wing lofting sheets P.196 and P.197 — full-scale 1:1 production templates, leading and trailing edge with aileron cutout
• Wing lofting master — drawing No. 34000, S.S.7 — 16 station lines A through 16

Structural Engineering Drawings — 149+ Documents

Wing Structure

• Wing internal structure — drawing No. 33008 — full half-wing plan, ribs 1–17, main and secondary spar, diagonal bracing
• Wing skin panel layout — Semi ala sinistra, drawing No. 32054 — upper and lower surface panel boundaries, stringer grid, access panels
• Wing aerodynamic profile master — drawing No. 32019 — 14 rib stations, airfoil coordinate table (A–K), aileron geometry
• Wing center section — drawing No. 31007 — 4 fuel tank bays with octagonal lightening holes, landing gear bay, spar curves, diagonal bracing, 6 detail views
• Wing skin thickness schedule — Schema Spessore Compensato di Copertura, drawing No. 32119/60 — dorsal and ventral ply zones, 4 thickness grades
• Wing internal equipment — Ventro Alare, drawing No. 35000 — fuel tank, oil tank, control runs, 18 numbered items
• Wing upper surface layout — Dorso Alare, drawing No. 32030 — access panels, structural cutouts, 9 items
• Main spar — Super S.7, drawing No. 32014-m — Costole e Punton in Sprouce (spruce ribs and struts), spar taper geometry
• Wing spar frame assembly — drawing No. 22150 — rib cross-sections at stations A-B, C-D, root — wooden construction detail

Tail Unit

• Tail fin / vertical stabilizer — drawing No. 38053 — fin planform, internal spar and rib structure, fuselage attachment
• Tail aerodynamic profiles — drawing No. 40025 — fin/rudder and horizontal stabilizer with full coordinate tables (A–M, rows 1–8)
• Tail rib profiles — drawing No. 50021 — 4 rib cross-sections with coordinate tables, Ht 20 pezzi

Fuselage

• Fuselage structural assembly — drawing No. 16083 — full plan view, cockpit, fuel tank bay, engine mount, spar cross-sections at 4 stations (Testa/Corpo/Piede)
• Fuselage frame stations — drawing No. 39250 — 15 numbered frame stations, side elevation and top plan
• Fuselage full structural side elevation — 20+ frame stations in circles, cockpit detail, tail fitting, 3 frame cross-sections
• Engine mount / firewall — drawing Nos. 2210 and 2219 — circular firewall plan, 8–12 bolt positions, fuel and oil line penetrations

Landing Gear

• Landing gear retraction assembly — Super S.7, drawing No. 34044 — 33 numbered components, strut, drag brace, actuator arm, wheel bay, torque links
• Landing gear retraction linkage — drawing No. 34042 — pivot assembly, clevis fittings, actuator rod geometry, 20+ dimensions

Cockpit & Systems

• Cockpit canopy / windscreen frame — drawing No. 12064 — three views, glazing panel, 9-item parts list
• Cockpit / fuselage section — drawing No. 12094 — seat, instrument panel, control column, fuel tank plan
• Full aircraft internal systems layout — complete fuselage side elevation, all systems visible, 30+ labeled callouts
• Wing installation drawing — Planche Installazioni — right and left wing installed systems, hydraulic, electrical, control runs, ribs 1–27

Control Surfaces

• Aileron balance calculation — Alettone — Cs = 640 g, balance arm dimensions, 4 load cases, signed official document
• Aileron brackets — drawing Nos. 32006/1, 32006/2, 32006/3 — Scale 1:1, signed, ING. A. AMBROSINI & C. — ribs 2, 4 bis, 7
• Aileron hinge bracket — drawing No. 32022/1 — Scale 1:1, material Acc. P.60/60, rib 7
• Aileron special bolt — drawing No. 32022/8 — Scale 1:1, Velivolo: Ambrosini Super 7 confirmed in title block

Propulsion

• Propeller hub / spinner assembly — drawing No. 31050 — 8-bolt flange, central bearing races, 8 numbered components
• Engine mount / nose structure — drawing No. 32/12 — triangulated steel tube structure, firewall, 4 attachment points
• Wing root / nose structure — drawing No. 6220 — teardrop wooden nose block with internal Star-of-David triangulated bracing

General Arrangement

• Full aircraft three-view general arrangement — Ala S.5, drawing No. ALP.1301 — top view, front elevation, plan view — signed and stamped official factory document

Aircraft Profile

The Ambrosini S.7 was designed by Ing. Sergio Stefanutti at Società Aeronautica Italiana, Passignano sul Trasimeno, as a high-performance wooden monoplane for Italian aerobatic and racing competition. The Super S.7 was the upgraded variant, featuring a more powerful engine installation and refined aerodynamics. Both variants competed in Italian national championships in the early 1950s. The aircraft's all-wooden construction — spruce spars, plywood skin, fabric-covered control surfaces — represents the pinnacle of Italian wooden aircraft engineering of the period.

Document Condition & Format

All documents are archival static-copy scans of original Ufficio Tecnico factory drawings. Many bear Copia provvisoria stamps, official SAI title blocks, drawing numbers, dates, and designer signatures. The collection includes both cancelled revisions (Annullato) and final approved versions, providing unique insight into the design evolution of the aircraft. Digital download, instant access.

This is an archival, static-copy edition fixed at its original publication date. Intended for historical reference, flight simulation, museum restoration, and educational use only. Not approved for active airworthiness maintenance under FAA 14 CFR § 43.13, EASA Part-M, or equivalent international regulations. Operators of active aircraft must use current, revision-controlled publications from the Type Certificate holder or an authorized distributor.

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