/Fm4 299 0 R /Fm3 298 0 R /Lang (EN-GB) 274 0 obj >> /K 173 /P 535 0 R /S /Tabelle_content A notable fact is that the rotors of a helicopter serve the same purpose as the wings of a plane, so are considered part of the helicopter . 257 0 obj >> endobj /Pg 35 0 R http://www.zotero.org/styles/modern-humanities-research-association /Lang (EN-GB) >> /TT2 303 0 R Aircraft/Structures - Wikiversity /A 398 0 R One of the helicopters came down and major components/assemblies were recovered . >> /P 510 0 R << /C2_0 362 0 R /C2_0 365 0 R /S /Tabelle_content /Pg 24 0 R /A 414 0 R Instead, an engine-driven adjustable fan is located inside the tail boom. /K 26 /Tabelle_content /P /K 156 >> endobj endobj /Lang (EN-GB) /Lang (EN-GB) /A 401 0 R /AcroForm 2 0 R endobj /Lang (EN-GB) >> 94 0 obj endobj /P 601 0 R 123 0 obj Automating Carbon-Fiber Composite Fuselage Assembly 163 0 obj >> -Consists of 2 main rotors located 1 directly behind the other. << << /MCID 0 /K 22 [Figure 5]. Quick delivery of your "Curtiss H-75A-4 Hawk "French s" airplane model kit at the price of 21.99 GBP with 1001hobbies, the AZ Models specialist. %PDF-1.6
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/Lang (EN-GB) /K 66 /Pg 43 0 R 267 0 obj 95 0 obj /K 7 /MediaBox [0.0 0.0 595.32 841.92] << endobj /S /Normal << /TT2 311 0 R /P 588 0 R >> /A 408 0 R >> /P 633 0 R 161 0 obj /Pg 35 0 R /GS0 307 0 R Provides data that is required by the CIPS unit for blade tracking analysis, Mounted accelerometers on or around the component under test provide to the CIPS the data required to calculate a balance or soothing solution, Helicopter flying handbook, ch 1-3 intro / Ae, Introduction to Chemical Engineering Thermodynamics, Hendrick Van Ness, J.M. /S /Normal /K 3 << Engineers continually search for ways to reduce vibration and noise caused by the rotating parts of the helicopter. endobj /A 412 0 R /CropBox [0.0 0.0 595.32 841.92] /Underline /Span /Lang (EN-GB) >> >> /Pg 35 0 R stream
/Contents 302 0 R /P 17 0 R Introduction) /S /Normal NOTAR is an acronym that stands for no tail rotor. As the speed of the main rotor changes, the speed of the NOTAR fan changes. /P 660 0 R endobj NAFEMS World Congress 2017 << >> /GS0 307 0 R /Parent 16 0 R /K 13 . /S /Normal /S /Tabelle_content /A 483 0 R /Pg 35 0 R 162 0 obj << /Pg 41 0 R endobj endobj endobj /K 13 /Pg 24 0 R >> /S /Span 191 0 obj Cyclic Control A helicopter pilot controls the pitch, or angle, of the rotor blades with two inputs: the cyclic- and collective-pitch levers, often just shortened to the cyclic and the collective. /A 457 0 R /Encoding << >> endobj /ColorSpace << >> << /S /Tabelle_content Li Yuan is an academic researcher. endobj << The aircraft is made up of an airframe, specifically fuselage, booms, nacelles, cowlings, fairings, airfoil surfaces, and landing gear. << /K 80 /P 586 0 R /S /Normal /CropBox [0.0 0.0 595.32 841.92] /GS0 288 0 R This design methodology was born out of the use of aluminium, rather than steel or wood, as the primary structural material used to manufacture airframe structures. /ProcSet [/PDF /Text] American Political Science Association >> endobj /RoleMap 19 0 R /TT1 310 0 R Fuselage. /K 152 /S /Artifact What type of design is used on many Navy helicopters? >> /Lang (EN-GB) /XObject << >> fuselage shell geometry calculations; optional integration of a cylindrical fuselage midsection between the nose and tail sections; addition of landing and bump maneuvers to the load cases sizing the fuselage; ability to introduce an elliptical spanwise lift load distribution on the wing; variation of wing thickness ratio from tip to root; ability /P 17 0 R /Pg 35 0 R /MediaBox [0.0 0.0 595.32 841.92] /Font << >> /S /Tabelle_content /Rotate 0 /Pg 35 0 R endobj >> /TT2 329 0 R /P 17 0 R << Comparing the Different Types of Aircraft Fuselage Structures /ProcSet [/PDF /Text /ImageC] /K 7 /S /Tabelle_content The evolution of composites Wood and dope and fabric structures in the 1930s and '40s gave way to thin-skinned adhesively bonded aluminum structures in the 1950s and '60s. endobj /Pg 35 0 R /P 17 0 R /Pg 26 0 R /StructParents 1 << /K 59 Spar (aeronautics) - Wikipedia /S /Subscript >> << 192 0 obj /Parent 4 0 R endobj /K 139 endobj /Pg 35 0 R endobj >> /P 81 0 R /Lang (EN-GB) 0
http://www.zotero.org/styles/harvard1 /P 426 0 R /S /P /P 673 0 R /Pg 41 0 R 255 0 obj >> 8 0 obj /Parent 14 0 R /ExtGState << >> /A 513 0 R /Lang (EN-GB) /DropCap /Figure >> /A 383 0 R /S /Table << endobj endobj /K 28 Fuselage The main body of the helicopter is known as the fuselage. $A`g @B0HP[$>3012Ig
/S /Normal Using a 2mm self tap screw, access the rear bracket hole and tap a drill hole for the rear bracket. /S /Author /TT0 313 0 R 83 0 obj /ColorSpace << /A 443 0 R /K 5 /S /Strong /S /P /A 578 0 R What is the coordinate system used in an Aircraft? Free shipping for many products! /A 533 0 R /Lang (EN-GB) 1d1e5abf-ebcb-3108-aaa6-aebad3f81fd6 The company's customer base consists of the world's leading aerospace OEMs, and more than 80 percent of its . /S /Normal /TT0 290 0 R 15 0 obj /CropBox [0.0 0.0 595.32 841.92] /K 131 /P 17 0 R >> /S /Normal endobj /K 17 48 0 obj endobj /Pg 33 0 R /S /Span << /D [24 0 R /XYZ 104 737 0.0] << /S /Subscript /ExtGState << The tail boom and tail rotor, or antitorque rotor, counteract this torque effect. -mechanically connected to the main transmission gearbox through a main driveshaft, Transmits torque from the power turbine to the main gearbox and is dynamically balanced, Main transmission gearbox /Lang (EN-GB) /S /Normal The invention relates to a helicopter fuselage of the type including a central structure to which are linked a front structure, a rear structure and a landing gear, and which supports a transmission gearbox, a main rotor and at least one engine (50), and of the type in which the central structure includes a skeleton (16) fitted with covering elements which define the external shape of the . /Pg 35 0 R 62 0 obj >> /ColorSpace << This website uses cookies to ensure you get the best experience on our website. /A 439 0 R /Font << >> 73 0 R 130 0 R 73 0 R 131 0 R 73 0 R 132 0 R 73 0 R 133 0 R 73 0 R 134 0 R /Lang (EN-GB) 52 0 obj /S /Tabelle_content /Lang (EN-GB) /Pg 35 0 R 225 0 obj /P 17 0 R from China. /Lang (EN-GB) >> /A 488 0 R /Pg 35 0 R /A 484 0 R ] HobbyZone AB3 Fuselage: CH 3 27.095 RC Helicopter Part Heli Radio endobj /A 627 0 R /Lang (EN-US) /S /Tabelle_content /K 42 endobj /P 17 0 R gearbox has provisions for operating in the event of a single failure /Contents 375 0 R << << /P 669 0 R endobj /XObject << endobj /Lang (EN-GB) /A 623 0 R /Sh6 354 0 R 114 0 R 115 0 R 116 0 R 117 0 R 118 0 R] /P 17 0 R 80 0 obj endobj /Fm2 297 0 R >> /Mendeley#20Recent#20Style#20Id#207_1 (http://www.zotero.org/styles/modern-humanities-research-association) /DR << -Consists of 1 main rotor and a rotary rudder. >> /Lang (EN-GB) << /Pg 25 0 R Most have the pilot seated on the right side, although there are some with the pilot seated on the left side or center. A typical semi-monocoque fuselage consists of the following elements: These make up the longitudinal components of the structure. /K 163 Working the pedals affects which way the helicopter points, so pushing the right pedal deflects the tail of the helicopter to the left and the nose to the right; the left pedal turns the nose to the left. /C2_0 365 0 R >> /S /Tabelle_content << /Lang (EN-GB) endobj /K 15 /Type /Page /K 168 /K 36 /S /Artifact /Pg 35 0 R endobj << << 203 0 obj /A 462 0 R /P 17 0 R >> << /PDFDocEncoding 8 0 R >> << /Mendeley#20Recent#20Style#20Id#204_1 (http://www.zotero.org/styles/chicago-author-date) Other important ight subsystems, illustrated in Figure 1.1, are the horizontal tail, the vertical tail, and the engines. /K 125 /ViewerPreferences << >> /P 574 0 R /Type /Page /P 73 0 R << Collective Control The collective-pitch lever is responsible for up-and-down movements. /Pg 35 0 R /Mendeley#20Recent#20Style#20Name#205_1 (Harvard Reference format 1 \(author-date\)) /P 419 0 R /Sh1 339 0 R << 186 0 obj endobj /S /P helicopter frames consist of the fuselage - Vozhispananews.com /A 382 0 R What does the helicopter fuselage consist of? /P 73 0 R << 28 0 obj Often designs using flextures incorporate elastomeric bearings. /Pg 35 0 R endobj 168 0 obj /P 17 0 R endobj /TT4 314 0 R endobj /Pg 35 0 R /Sh6 324 0 R >> /Lang (EN-GB) Single Rotor. /MediaBox [0.0 0.0 595.32 841.92] endobj endobj /Lang (EN-GB) /S /Normal endobj /S /Tabelle_content << /P 628 0 R /K 17 /Lang (EN-GB) endobj The semirigid rotor system in Figure 4 makes use of a teetering hinge at the blade attach point. 233 0 obj /Mendeley#20Recent#20Style#20Name#200_1 (American Medical Association) endobj << The A-129 yaws greatly, without suffering the main rotor influence that many other helicopters must deal with. /BaseFont /ZapfDingbats >> /A 405 0 R 96 0 obj /Font << 2017-05-08T21:10:16+01:00 /Pg 33 0 R /P 635 0 R /S /Span /Pg 35 0 R /K 122 80 0 obj
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/MediaBox [0.0 0.0 595.32 841.92] << >> /Font << /Im0 370 0 R Please refer to our privacy policy for further information. /Rotate 0 Please copy/paste the following text to properly cite this HowStuffWorks.com article: Tom Harris & Talon Homer /K 0 /S /Normal /XObject << /K 69 >> /K 128 >> 226 0 obj 2023 AeroToolbox.com | Built in Python by, Aerodynamic Lift, Drag and Moment Coefficients, Aircraft Horizontal and Vertical Tail Design. /K 126 /Sh18 348 0 R /Pg 35 0 R >> << << /ProcSet [/PDF /Text] In others, it's a hollow carbon-fiber or aluminum tube. /Rotate 0 119 0 obj << >> >> /Sh14 344 0 R /S /Normal /Lang (EN-GB) /K 4 1. endobj /CropBox [0.0 0.0 595.32 841.92] /P 612 0 R /Fm2 297 0 R /P 436 0 R << hbbd``b` The heavier the helicopter, the bigger the engine/s which requires a stronger fuselage. 32 0 obj -uses free turbine principle for PTO to drive the main trans. >> /A 634 0 R 251 0 R 252 0 R 253 0 R 254 0 R 255 0 R null 256 0 R null 257 0 R 258 0 R /S /L /P 556 0 R Fuselage Frame - an overview | ScienceDirect Topics /GS2 309 0 R /Pg 30 0 R Air is vented out of two long slots on the right side of the tail boom, entraining main rotor wash to hug the right side of the tail boom, in turn causing laminar flow and a low pressure (Coanda Effect). >> /Pg 42 0 R endobj /MarkInfo << /P 499 0 R /A 452 0 R and Review ?. << /P 621 0 R 277 0 obj /A 536 0 R >> /Pg 41 0 R /P 17 0 R /Pg 35 0 R /Sh1 316 0 R << /Pg 35 0 R >> 165 0 obj >> /Pg 24 0 R Normally, it supports the tail rotor assembly, although some tail rotors are mounted on the tail cone of the boom. endobj >> /A 677 0 R . /CS0 [/ICCBased 287 0 R] endobj /K 116 June 22, 2022. ilive code for dish remote . /K 7 << endobj endobj [Figures 10], {getWidget} $results={3} $label={recent} $type={list1}. /S /P /Rotate 0 /K 2 /Lang (EN-GB) /TT0 310 0 R 77 0 obj /ProcSet [/PDF /Text /ImageC] /Pg 35 0 R 126 0 obj >> 220 0 obj /ColorSpace << >> Additionally, a horizontal member called a stabilizer is often constructed at the tail cone or on the pylon. /brokenbar 168 /dieresis /copyright /ordfeminine 172 /logicalnot /.notdef /registered /macron 25 0 obj 133 0 obj /P 73 0 R /Count 0 endobj >> /K [1 265 0 R] 51 0 obj /S /Normal /S /Tabelle_content /Mendeley#20Recent#20Style#20Name#206_1 (IEEE) /Tabs /S /Pg 35 0 R endobj /P 646 0 R /K 13 /K 0 >> /Lang (EN-GB) /P 425 0 R /P 594 0 R /K 12 /GS0 307 0 R The wings and tail section are attached to the fuselage, and depending on the design of the aircraft, may include engine attachments too. /Annotation /Span 3218 Kalle Saastamoinen et al. 216 0 obj /Type /Font /A 665 0 R /XObject << /K 1 /P 96 0 R 5 0 obj 244 0 obj /A 515 0 R >> endobj 57 0 obj /K [5 395 0 R] /Parent 4 0 R /S /Tabelle_content / Procedia Computer Science 176 (2020) 3217-3224 2 Author name / Procedia Computer Science 00 (2020) 000-000 1. /GS0 307 0 R /XObject << /Pg 35 0 R >> /S /Subscript /K 107 213 0 obj 196 0 obj 17 0 obj /P 17 0 R /Fm1 296 0 R /Pg 35 0 R AirCraft Construction and Materials Flashcards | Quizlet Tilting the rotor plane of rotation causes the aircraft to move horizontally. /Lang (EN-GB) Introduction The design of a new rotorcraft is generally considered as a highly challenging task. << 144 0 obj /MediaBox [0.0 0.0 595.32 841.92] /Next 23 0 R << /Sh0 338 0 R >> /K 9 >> /P 577 0 R endobj /S /P /Lang (EN-GB) >> /Type /Pages << Also, the feathering hinge allows blade pitch changes by permitting rotation about the spanwise axis. 117 0 obj If you missed part one, then perhaps go back and read this before continuing as this provides an overview on structural loading and design. /Pg 35 0 R /A 580 0 R /Pg 35 0 R /K 187 >> endobj >> << -independent from gas generator, -exhaust gases from the gas generator turbine drive the power turbine /A 598 0 R /ExtGState << /Lang (DE-DE) /S /P -movement about this axis is called pitch and is controlled by the cyclic stick, -provides power to drive rotors and related systems of the helicopter /CS0 [/ICCBased 287 0 R] >> /P 433 0 R endobj << /S /Artifact The result is a simpler rotor mast with lower maintenance due to fewer moving parts. >> 122 0 obj >> /Lang (EN-GB) << /A 410 0 R >> /A 584 0 R 268 0 obj At 1001hobbies, we share your p The latter two are still in use. /P 503 0 R 248 0 obj /CS0 [/ICCBased 287 0 R] /Font << /A 453 0 R Free shipping above 99. /A 641 0 R /A 638 0 R Top customer satisfaction 4,2/5. /Lang (EN-GB) 139 0 obj << << /P 523 0 R /TT3 291 0 R 6.S- PRAhJG CO/lX>ej} UJf&TM /2 t^. /A 459 0 R /S /Author /odieresis /divide /oslash /ugrave /uacute /ucircumflex /udieresis /yacute /thorn /ydieresis] 170 0 obj >> >> /Fm1 296 0 R 24 0 obj /Mendeley#20Recent#20Style#20Id#201_1 (http://www.zotero.org/styles/american-political-science-association) /A 385 0 R 73 0 obj /Sh9 357 0 R /P 642 0 R >> Acrobat PDFMaker 17 for Word << 73 0 R] /Parent 5 0 R /P 583 0 R /S /Normal /S /Tabelle_content << /Lang (EN-GB) Show, by giving a DTD, how to represent the non-1NF books relation as shown in earlier Section using XML. /S /Tabelle_content /A 394 0 R >> /K [184 263 0 R 188] 218 0 obj /P 423 0 R << 149 0 obj /K 25 /K 144 /Pg 25 0 R /S /Normal It holds crew, passengers, or cargo.In single-engine aircraft, it will usually contain an engine as well, although in some amphibious aircraft the single engine is mounted on a pylon attached to the fuselage, which in turn is used as a floating hull. /XObject << >> /S /Tabelle_content 65 0 obj 52 0 obj
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88 0 obj /Lang (EN-GB) /Pages 5 0 R /A 472 0 R /ColorSpace << /P 17 0 R endobj /Pg 35 0 R /Pg 35 0 R /Pg 43 0 R Only associated with fully articulated rotor systems, Tendency of a helicopters main body to move in the opposite direction of the main rotor when power is applied, Process of producing lift w/the rotor blades as they freely rotate from a flow of air up through the rotor system. /P 538 0 R 128 0 obj The skins carry load through shear and transmit this shear into the stiffeners. 21 0 obj << >> >> A NOTAR antitorque system has no visible rotor mounted on the tail boom. /K 9 163 0 R 164 0 R 165 0 R null 166 0 R null 167 0 R 168 0 R null 169 0 R According to Wikipedia, the semi-monocoqne fuselage structure is preferred when constructing an all-aluminum fuselage. >> /Next 12 0 R 118 0 obj << /A 275 0 R /Lang (EN-US) /Fm3 298 0 R /Pg 35 0 R /P 17 0 R endobj 138 0 obj /Type /Metadata /P 554 0 R /Resources << >> /Fm1 296 0 R << The A-129 International is a fast, manoeuvrable helicopter. /CS1 [/ICCBased 306 0 R] >> endobj /S /P /P 495 0 R /CropBox [0.0 0.0 595.32 841.92] /A 479 0 R /Lang (DE-DE) /P 46 0 R /Pg 42 0 R /A 487 0 R /P 17 0 R /ProcSet [/PDF /Text /ImageC] /CS1 [/ICCBased 306 0 R] /A 387 0 R /Lang (EN-GB) /Pg 42 0 R >> /Mendeley#20Recent#20Style#20Id#206_1 (http://www.zotero.org/styles/ieee) endobj /K 108 /K [21 270 0 R] /Resources << /P 427 0 R /Pg 35 0 R Define the SHGC (solar heat gain coefficient), and explain how it differs from the SC (shading coefficient). One popular aircraft designed with a space frame fuselage is the iconic PA-18 Piper Super Cub which is pictured below. >> /S /Tabelle_content /Type /Pages /Type /Encoding >> 1 [53 0 R 54 0 R 55 0 R 56 0 R 57 0 R 58 0 R] 84 0 R 85 0 R 86 0 R 87 0 R 88 0 R 89 0 R 90 0 R 91 0 R 92 0 R 93 0 R /A 548 0 R >> >> endobj /A 527 0 R /S /Tabelle_content 61 0 obj /S /Normal << endobj >> /P 603 0 R . -rotary rudder counteracts torque developed by the rotor head. null 97 0 R 98 0 R] /A 402 0 R << /S /Tabelle_content /XObject << endobj /Lang (EN-GB) /K 49 /P 590 0 R << /Pg 33 0 R /A 591 0 R /P 430 0 R /A 596 0 R endobj >> /K 134 A typical helicopter fuselage structure shown in Fig 1 consists of several key components: (a) Subfloor box, (b) Energy absorbing beam, (c) Box beam frame members, (d) Longitudinal beam, and (e) Outer fuselage skin. /K 186 /S /P >> 31 0 obj /A 661 0 R >> /S /Tabelle_content /Lang (EN-GB) /CropBox [0.0 0.0 595.32 841.92] /Pg 33 0 R /Footnote /Note /P 415 0 R 158 0 obj >> /TextBox /Art >> >> In many models, a frameless plastic canopy surrounds the pilot and connects in the rear to a flush-riveted aluminum frame. A comparison between two types of helicopter fuselage panels with a traditional design of skin and stringers was carried out. areas are at the fuselage upper part and at the joints of the fuselage frames to the wing spars. /K 46 -Runs from nose to tail /P 519 0 R /Fm2 297 0 R /Pg 42 0 R Enthusiats at your service : at 1001hobbies, we share your endobj /Font << >> /Contents 361 0 R 1. /P 17 0 R /ColorSpace << /CS0 [/ICCBased 287 0 R] >> /Rotate 0 /MediaBox [0.0 0.0 595.32 841.92] For instance, 53 percent of the aircraft consists of carbon-fiber composite parts. /MediaBox [0.0 0.0 595.32 841.92] gearbox /Lang (EN-GB) >> /K 4 /A 391 0 R /Lang (EN-GB) %PDF-1.3 endobj /Strikeout /Span /P 537 0 R >> 3. /K 148 /XObject << Special Offer on Antivirus Software From HowStuffWorks and TotalAV Security. /Sh0 315 0 R helicopter frames consist of the fuselage. << /S /Normal /MediaBox [0.0 0.0 595.32 841.92] /Pg 35 0 R /Author (D. Schwinn, P. Weiand, M. Schmid) >> endobj >> /K [185 442 0 R] /Mendeley#20Recent#20Style#20Id#209_1 (http://www.zotero.org/styles/nature) /Fm0 295 0 R /S /Normal [Figure 1-13] Helicopter airframes consist of the fuselage, main rotor and related gearbox, tail rotor (on helicopters with a single main rotor), and the landing gear. /Pg 33 0 R /Pg 35 0 R
/K 44 >> endobj /Parent 14 0 R >> << >> /Lang (EN-GB) /S /Subscript /Lang (EN-GB) endobj -sections: gas generator, power turbine, main drive shaft, -may be axial flow or combined axial/centrifugal flow gas turbine engine /P 431 0 R The cyclic, or "stick," comes out of the floor of the cockpit and sits between the pilot's legs, enabling a person to tilt the craft to either side or forward and backward. It's enough to make your stomach heave just thinking about all that endless circling. /Fm1 296 0 R /Chart /Figure /S /Subscript /K 140 /Pg 35 0 R /Lang (EN-GB) /S /Normal These are just a few of the most common fuselage . << /Sh10 340 0 R /Pg 35 0 R /Pg 35 0 R >> /CS0 [/ICCBased 287 0 R] /Normal /P >> /K 54 >> /Type /Pages >> /S /Normal /CS0 [/ICCBased 287 0 R] /S /Tabelle_content >> /P 17 0 R 74 0 R 75 0 R 76 0 R 77 0 R 78 0 R 79 0 R 80 0 R 81 0 R 82 0 R 83 0 R endobj /K 1 Answer (1 of 3): Cloth, plywood, aluminum alloy from 1920, composites from 1990. endobj /CS0 [/ICCBased 287 0 R] /Lang (EN-GB) endobj /ProcSet [/PDF /Text /ImageC] /K [176 262 0 R] /Pg 42 0 R /GS1 308 0 R /S /Subscript >> May or may not actuate during blade folding, -self exited vibration, which occurs on the ground /Im0 368 0 R 17 [88 0 R 89 0 R 90 0 R 91 0 R 92 0 R 93 0 R 94 0 R 95 0 R 96 0 R 264 0 R /Fm2 297 0 R /ExtGState << endobj Stringers are attached to join with the fixture. nafems /Pg 35 0 R /TT1 310 0 R /Rotate 0 /CS0 [/ICCBased 287 0 R] >> From Wikipedia." airplane model kit at the price of 84.99 USD with 1001hobbies, the AModel specialist. >> << endobj /Type /Page The fuselage, the outer core of the airframe, is an aircraft's main body section that houses the cabin which holds the crew, passengers, and cargo. /A 393 0 R << /MediaBox [0.0 0.0 595.32 841.92] - The invention relates to a helicopter fuselage of the type including a central structure to which are attached a front structure, a rear structure and a landing gear, and which supports a transmission gearbox, a main rotor and at least one engine (50), and of the type in which the central structure includes a framework (16) fitted with cladding elements which define the external shape of the . /Lang (EN-GB) /Pg 35 0 R uuid:1829709f-1569-4b41-ae83-38410010e776 78 0 obj 23 0 obj /S /Tabelle_content /ExtGState << /Lang (EN-GB) As the plane of rotation of the rotor blades is tilted and the helicopter begins to move forward, an advancing blade and a retreating blade become established (on two-bladed systems).