US3583659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary-wing aircraft having an auxiliary rotor at its tail
Assignee: SOC D CONST ET D EXPLOIT DE MA
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Filing: 1969-04-21
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Granted: 1971-06-08
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Expires: 1989-04-21
Abstract
Abstract In addition to the rotary lifting aerofoil, the aircraft has, inside an opening formed in the vertical fin, an auxiliary rotor. The horizontal stabilizer is arranged in the form of at least one ring surrounding the rotor, so that these rings play the double role of a horizontal stabilizer and of a protective member against shocks.
Inventors
- 👤 Lucien Lermusiaux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:54
CPC Classifications
G; G12; G12B; G12B9/00; G12B9/02; B; B64; B64C; B64C27/00; B64C27/82; B64C2027/8254
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
Rotary-wing aircraft having a tail which carries at least one auxiliary rotor driven by a motor, said auxiliary rotor having an axis substantially perpendicular to the longitudinal axis of the aircraft, at least one vertical stabilizer and at least one horizontal stabilizer, wherein said at least one auxiliary rotor is disposed within a space bounded by said stabilizers, one of said stabilizers being arranged in the form of at least one ring surrounding said rotor so that this ring plays the double role of a stabilizer and of a shock-protecting member.
Claim 2
Dependent Claim
91 words
Rotary-wing aircraft having a tail which carries at least one auxiliary rotor driven by a motor, said auxiliary rotor having an axis substantially perpendicular to the longitudinal axis of the aircraft, at least one vertical stabilizer and at least one horizontal stabilizer, wherein said at least one auxiliary rotor is disposed within a space bounded by said stabilizers, one of said stabilizers being arranged in the form of at least one ring surrounding said rotor so that this ring plays the double role of a stabilizer and of a shock-protecting member.
Claim 3
Dependent Claim
43 words
Rotary-wing aircraft according to claim 1, whose rotary wing is driven by a motor (helicopter). wherein said vertical stabilizer is a vertical fin and said space is bounded within said vertical fin, said at least one protective ring then forming the horizontal stabilizer.
Claim 4
Dependent Claim
43 words
Rotary-wing aircraft according to claim 2, wherein each ring comprises two ring elements disposed one on each side of said vertical fin, and the exterior contour of each ring element situated on one side of said vertical fin is limited by circular arcs.
Claim 5
Dependent Claim
13 words
Rotary-wing aircraft according to claim 2, wherein each ring has a polygonal profile.
Claim 6
Dependent Claim
33 words
Rotary-wing aircraft according to claim 2, wherein each ring comprises two ring elements disposed one on each side of said vertical fin, and each ring element has the form of a helical skew.
Claim 7
Dependent Claim
22 words
Rotary-wing aircraft according to claim 2, wherein said vertical fin has a thickness sufficient to contain, within that thickness, the auxiliary rotor.
References Cited (Backward Citations)
US1964179A
Cited
US2135073A
Cited
GB572417A
Cited
US2994384A
Cited
US3116036A
Cited
US3241791A
Cited
US3260482A
Cited
US3332643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |