GB2494948A - Hybrid ramjet rotor/fixed wing aircraft - Google Patents
Hybrid ramjet rotor/fixed wing aircraft Download PDFInfo
- Publication number
- GB2494948A GB2494948A GB1208743.3A GB201208743A GB2494948A GB 2494948 A GB2494948 A GB 2494948A GB 201208743 A GB201208743 A GB 201208743A GB 2494948 A GB2494948 A GB 2494948A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ramjet
- propeller blade
- text
- aircraft
- mode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000007704 transition Effects 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 230000001141 propulsive effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K7/00—Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof
- F02K7/10—Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof characterised by having ram-action compression, i.e. aero-thermo-dynamic-ducts or ram-jet engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/04—Helicopters
- B64C27/12—Rotor drives
- B64C27/16—Drive of rotors by means, e.g. propellers, mounted on rotor blades
- B64C27/18—Drive of rotors by means, e.g. propellers, mounted on rotor blades the means being jet-reaction apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C29/00—Aircraft capable of landing or taking-off vertically, e.g. vertical take-off and landing [VTOL] aircraft
- B64C29/0008—Aircraft capable of landing or taking-off vertically, e.g. vertical take-off and landing [VTOL] aircraft having its flight directional axis horizontal when grounded
- B64C29/0016—Aircraft capable of landing or taking-off vertically, e.g. vertical take-off and landing [VTOL] aircraft having its flight directional axis horizontal when grounded the lift during taking-off being created by free or ducted propellers or by blowers
- B64C29/0033—Aircraft capable of landing or taking-off vertically, e.g. vertical take-off and landing [VTOL] aircraft having its flight directional axis horizontal when grounded the lift during taking-off being created by free or ducted propellers or by blowers the propellers being tiltable relative to the fuselage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D27/00—Arrangement or mounting of power plants in aircraft; Aircraft characterised by the type or position of power plants
- B64D27/02—Aircraft characterised by the type or position of power plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D27/00—Arrangement or mounting of power plants in aircraft; Aircraft characterised by the type or position of power plants
- B64D27/02—Aircraft characterised by the type or position of power plants
- B64D27/16—Aircraft characterised by the type or position of power plants of jet type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K7/00—Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof
- F02K7/08—Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof the jet being continuous
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Transmission Devices (AREA)
- Control Of Turbines (AREA)
Abstract
An aircraft having at least one ramjet 1 connected to at least one propeller blade 2, the ramjet and propeller blade being rotatable and centrifugally balanced around a primary axis. In a first mode of operation the ramjet is operated to rotate the propeller about the primary axis, in a second mode of operation the ram jet is used to provide propulsive thrust to the aircraft. the propeller blade pitch is adjustable between the first and second mode of operation. The propeller blade may be lockable to a fixed position. Heat protection may be provided on portions of the aircraft near the ramjet; the heat protection is used to mitigate heating from the ramjet during transition between the first and second mode of operation.
Description
Low and high speed ramjet This invention relates to a ramjet which can be used to propel an aircraft from stationary to super or hyper sonic speeds.
Ramjets operate only at high airspeeds therefore other means of propulsion are required to reach their operational speed, adding weight and cost. Rotational ramjets turning propellers can be started when the aircraft is stationary, however the aircraft will be limited to the maximum speed of the propeller. To overcome this, the present invention proposes at least one ramjet connected to at least one propeller blade, whole said ramjet and said propeller blade assembly rotatable and centrifugally balanced, said propeller blade having adjustable pitch to enable said ramjet to face oncoming airflow and generate thrust directly as a rarnjet after said propeller blade has accelerated an aircraft to which it is attached under power of said ranijet to a high enough speed.
When the aircraft is stationary the rarnjet can be spun to enable it to generate thrust using the propeller blade. Once the aircraft has achieved a good airspeed the propeller blades pitch can be altered to slowly allow the ramjet to transition from a rotary position to a fixed conventional position facing the oncoming airflow to use the ramjet directly to accelerate the aircraft to speeds not achievable under rotary power.
Preferably, said assembly is lockable to a fixed position for pure ramjet mode.
Preferably, heat protection on portions of said aircraft near to said ramjets is used to mitigate heating from said ramjets during transition to said pure ramjet mode.
Preferably, two or more said ramjet or said propeller blade is used per said assembly.
Preferably, said ramjet or said propeller blade number two or four per said assembly.
An example of the invention will now be described by referring to the accompanying drawings: -figure 1 shows a side view of the low and high speed rainjet with two propeller blades and ranjets in a low speed configuration; and -figure 2 shows a side view of the low and high speed ramjet with two propeller blades and ranijets in a high speed configuration; and -figure 3 shows a front view of the low and high speed ramjet with two propeller blades and rainjets in a low speed configuration; and -figure 4 shows a front view of the low and high speed ramjet with two propeller blades and ramjets in a high speed configuration according to the invention.
At least one ramjet 1 is connected to the end of at least one propeller 2 but there may be two or more of each and being rotatable and centrifugally balanced. The pitch of the propeller blades and therefore the raxujets is adjustable. The propeller blades are spun, and therefore the ramjets as well when the aircraft they are attached to is stationary to enable the engine to be started at zero airspeed figures 1 and 3. The spinning of the propeller blades generates the thrust until enough forwards airspeed has been achieved then the pitch of the propeller blades and therefore the ramjets is adjusted so that the propeller blades and therefore the ramjets are tilted to face the oncoming airflow to generate thrust purely as ramjets figures 2 and 4. This process is reversed when slowing down for a landing.
The engine may be lockable in a suitable position when powered by ranjets directly, pure rainjet mode, so that the exhaust of the ra.mjets avoids parts of the aircraft such as a wing or tail surface. Parts of the aircraft near the engines may be heat shielded to mitigate heating from the ramjets during transition from the propellers generating thrust and the ramjets generating thrust. The engine would be started from an on board power supply or, to save weight, an external power supply at an airfield. There nay be two or four ramjets and propeller blades per assembly -
Claims (1)
- <claim-text>claims 1 At least one ramjet connected to at least one propeller blade, whole said ramjet and said propeller blade assembly rotatable and centrifugally balanced, said propeller blade having adjustable pitch to enable said ranjet to face oncoming airflow and generate thrust directly as a ramjet after said propeller blade has accelerated an aircraft to which it is attached under power of said rainjet to a high enough speed.</claim-text> <claim-text>2 At least one ramjet connected to at least one propeller blade according to claim 1, wherein said assembly is lockable to a fixed position for pure ramjet mode.</claim-text> <claim-text>3 At least one ramjet connected to at least one propeller blade according to claim 2, wherein heat protection on portions of said aircraft near to said ramjets is used to mitigate heating front said ranjets during transition to said pure ramjet mode.</claim-text> <claim-text>4 At least one ramjet connected to at least one propeller blade according to any of the preceding claims, wherein two or more said ramjet or said propeller blade is used per said assembly.At least one ramjet connected to at least one propeller blade according to any of the preceding claims, wherein said ramjet or said propeller blade number two or four per said assembly. C)</claim-text>
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB1116579.2A GB201116579D0 (en) | 2011-09-26 | 2011-09-26 | Low and high speed ramjet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201208743D0 GB201208743D0 (en) | 2012-07-04 |
| GB2494948A true GB2494948A (en) | 2013-03-27 |
Family
ID=44993392
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB1116579.2A Ceased GB201116579D0 (en) | 2011-09-26 | 2011-09-26 | Low and high speed ramjet |
| GB1208743.3A Withdrawn GB2494948A (en) | 2011-09-26 | 2012-05-17 | Hybrid ramjet rotor/fixed wing aircraft |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB1116579.2A Ceased GB201116579D0 (en) | 2011-09-26 | 2011-09-26 | Low and high speed ramjet |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB201116579D0 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2444781A (en) * | 1943-12-08 | 1948-07-06 | Lloyd H Leonard | Axial flow helicopter |
| US2479125A (en) * | 1943-10-06 | 1949-08-16 | Lloyd H Leonard | Variable attitude helicopter airplane |
| US2866608A (en) * | 1955-05-18 | 1958-12-30 | Lloyd H Leonard | Vertical-take-off type aircraft with jet driven rotor system |
| US3252673A (en) * | 1964-06-26 | 1966-05-24 | James B Reichert | Supersonic vtol aircraft and launch vehicle |
| US5516060A (en) * | 1993-03-29 | 1996-05-14 | Mcdonnell; William R. | Vertical take off and landing and horizontal flight aircraft |
-
2011
- 2011-09-26 GB GBGB1116579.2A patent/GB201116579D0/en not_active Ceased
-
2012
- 2012-05-17 GB GB1208743.3A patent/GB2494948A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2479125A (en) * | 1943-10-06 | 1949-08-16 | Lloyd H Leonard | Variable attitude helicopter airplane |
| US2444781A (en) * | 1943-12-08 | 1948-07-06 | Lloyd H Leonard | Axial flow helicopter |
| US2866608A (en) * | 1955-05-18 | 1958-12-30 | Lloyd H Leonard | Vertical-take-off type aircraft with jet driven rotor system |
| US3252673A (en) * | 1964-06-26 | 1966-05-24 | James B Reichert | Supersonic vtol aircraft and launch vehicle |
| US5516060A (en) * | 1993-03-29 | 1996-05-14 | Mcdonnell; William R. | Vertical take off and landing and horizontal flight aircraft |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201116579D0 (en) | 2011-11-09 |
| GB201208743D0 (en) | 2012-07-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |