Intermeshing rotor helicopter disadvantages. In this video, we talk about the Intermeshing rotors.
Intermeshing rotor helicopter disadvantages Jun 11, 2002 · An intermeshing rotor drive system of the K-MAX Helicopter has been analyzed and optimized for various rotor output speed applications. Each configuration has its own set of advantages and disadvantages. Nomenclature a Fluid speed of sound The Kaman K-225, the world's first helicopter with a turbine-driven transmission, represents the transition from piston engines that made a number of modern designs possible. According to Yves Le Bec, the Flettner Fl 282 was the world's first series production helicopter. is mainly used for cargo helicopters. UAV helicopter drone (UAV, unmanned aerial vehicle) with two counter-rotating, intermeshing rotors (so-called Flettner twin rotor system). This study aims to establish a novel trim method for an intermeshing rotor with an auxiliary propeller. Hectares of territories by October it was destroyed by fire across America. Intermeshing rotors come up with an interesting solution. The Kaman K-MAX is a good study in this area. One of a helicopter’s biggest inherent drawbacks is that power for lifting must be siphoned off to a tail rotor to counteract torque. Intermeshing helicopters are no different in this regard. offset flapping. intermeshing rotor helicopter “kaman k-max” Ravleen Kaur *1 , Pon Maa Kishan *2 *1 B . Apr 20, 2023 · Purpose This study aims to study the radar cross-section (RCS) of an intermeshing rotor with blade pitch. For cargo helicopters that require maximum lift with the design of tandem rotors such as the CH-47 Chinook is a good solution, but this aircraft is not at all compact. In 1947, the German aeronautical engineer Anton Flettner was brought to the United States as part of Operation Paperclip. However, the rear rotor works in the aerodynamic shadow of the front rotor, which reduces its efficiency. This eliminates the usual tail rotor and the otherwise necessary for this power can be converted into additional lifting power. Aerodynamic modeling for intermeshing rotor is much more complex because of the strong and May 1, 2024 · To study the influence of fuselage shape on the aerodynamic performance of a helicopter under the interference of an intermeshing-rotor, a numerical simulation method of flow field under the The Kaman HH-43 Huskie is a helicopter developed and produced by the American rotorcraft manufacturer Kaman Aircraft. 7500 NOTAR configuration for the intermeshing rotor helicopter allows the engine to entirely supply power to the main rotor system, which contributes to a high lift per horsepower ratio [2-4]. However, this type of rotor system provides the most control power to the helicopter during flight. This article delves into the intricate workings, types, and advancements in helicopter rotors, showcasing their significance in modern aviation. The two rotors mesh with one another, like a gearwheel. 264. Also, helicopters using coaxial rotors tend to be more compact (with a smaller footprint on the ground), though at the price of increased height, and consequently have uses in areas where space is at a premium; several Kamov designs are used in naval roles, being capable of operating from confined spaces on the decks of ships, including ships Intermeshing twin rotors of a Kaman K-Max Video of K-Max helicopter in flight, showing the meshing main rotors in motion. Jan 19, 2011 · Both have severe maneuverability issues, which is an issue for a combat helicopter (and which is why the choice is rather odd for the Ka-50) but is pretty much a non-issue for something like, say, a CH-47 - which technically has intermeshing rotors as it is. In particular, the model of the main rotor for the counter-clockwise rotor has been developed based on [24] and briefly described in section 2. This multi-rotor concept vehicle is intended to focus and guide NASA research activities in support of aircraft development for emerging aviation markets, in particular vertical take-o and landing air taxi operations. Its first flight was thus just one year after that of the Sikorsky VS-300 which introduced the "conventional" helicopter configuration with a tail rotor. For that application, you're going to see a significant advantage with coaxial. You can observe this design on K-MAX helicopters, developed by Kaman Aerospace Company. Coaxial rotors Intermeshing Rotors. A tail rotor requires a shaft to transmit power An intermeshing-rotor helicopter (or synchropter) is a helicopter with a set of two main rotors turning in opposite directions, with each rotor mast mounted with a slight angle to the other, in a transversely symmetrical manner, so that the blades intermesh without colliding. Mar 5, 2018 · The Kaman patent to which I link shows diagrams and describes the swashplate control and shows the hollow rotor shaft and so on - the patent shows only a single rotor helicopter but the dual intermeshing design uses the same hollow shaft etc. This video demonstrate how to fly the i #IntermeshingRotor #Helicopter #Aviation #RotaryWing #HelicopterDesign #FlightInnovation #HelicopterAviation #AerospaceEngineering # rotorcraft #AdvancedHeli The Configuration of a Helicopter Using Servo Flaps A good way to understand the advantages of this system is to consider a helicopter that is designed applying this technology. Submitted to. Jun 8, 2022 · However, the special intermeshing rotor structural helicopter easily introduces rotor-and-rotor interference, leading to unsteady aerodynamic loads on the rotor blades in mission flight. The arrangement allows the helicopter to function without a tail rotor which saves power. acting on a helicopter, it is necessary to introduce the element which counteracts this moment. Tandem rotor helicopters are able to hold more weight with shorter blades since they have two sets of rotors. The exception would be aerobatic model helicopters, which use symmetrical aerofoils because they are designed for similar performance either way up. Tech Aerospace (8th Sem) , Student Chandigarh University(Mohali) Punjab Pincode=147002 India Agreed. There are many basic geometric parameters that constitutive the main rotor design. Sep 2, 2024 · Helicopter rotors are critical components of rotary-wing aircraft that enable them to achieve vertical flight. The control linkage mechanism which controls the swash plate or plates is called the azimuth mechanism. The K-225 served as a prototype for the HTK, the first Kaman helicopter to be evaluated by the U. 4 %âãÏÓ 236 0 obj /Linearized 1 /O 238 /H [ 1073 292 ] /L 1874129 /E 15508 /N 34 /T 1869290 >> endobj xref 236 23 0000000016 00000 n 0000000811 00000 n 0000001365 00000 n 0000001746 00000 n 0000001863 00000 n 0000001985 00000 n 0000002024 00000 n 0000002046 00000 n 0000002552 00000 n 0000002573 00000 n 0000002695 00000 n 0000002813 00000 n 0000002932 00000 n 0000003051 00000 n Mar 22, 2022 · SimplePlane tutorial: Intermeshing prop helicopter are slightly different to fly compare to the standard helicopters. Side by side rotors are used for helicopters over 5000 pounds of weight, but they have great overall weight and parasite drag. A tandem-rotor helicopter has two large horizontal rotor assemblies. Navy. An intermeshing-rotor helicopter (or synchropter) is a helicopter with a set of two main rotors turning in opposite directions, with each rotor mast mounted with a slight angle to the other, in a transversely symmetrical manner, so that the blades intermesh without colliding. Blade-vortex interference and vortex-vortex interference coexist in the flow field of the intermeshing rotor. In this case the army is looking for a faster helicopter. [2] He was the developer of the two earlier synchropter designs from Germany during the Second World War: the Flettner Fl 265 which pioneered the synchropter layout, and the slightly later Flettner Fl 282 Kolibri ("Hummingbird Nope. Design/methodology/approach The variation of rotor blade pitch is designed into three two large horizontal rotor assemblies, instead of one main assembly and a smaller tail rotor. Twin non-coaxial rotor configurations, intermeshing rotors. The first helicopter, which this after its developer Anton Flettner notified principle used was in only 6 copies built Flettner Fl 265, the captain of flight Richard Perlia May The K-MAX semi-articulated intermeshing rotors are counter-rotating, providing an aerodynamically balanced rotor system that eliminates rotor torque reactions and the requirements for a tail rotor. The research entails a comparative analysis of rotor thrust coefficients and induced velocity distributions between these two rotor systems across various forward flight speeds. For a small helicopter, the tail rotor is the optimal choice due to its simplicity and low cost. The design of these rotor systems is crucial because it affects how helicopters perform, maneuver, and respond to different flying conditions. Jan 5, 2015 · Central Connecticut State University's (CCSU) Engineering Department is designing and testing a small scaled counter-rotating intermeshing rotor model helicopter to study various rotor shaft lateral tilt angle effects. Advantages •Tail rotor shaft failure remains one of the prime causes of helicopter accidents, both military and civilian. The tail blade can also be used more efficiently as it isn't constantly spinning to stop the heli from going out of control. Kaman began the Kaman Aircraft Company in late 1945 to develop an intermeshing twin-rotor helicopter, known as a synchropter, for the civilian market. The characteristic field of use of this design is carrying heavy loads. side-by-side intermeshing rotor helicopter with hybrid propulsion for air taxi operations. The advancing blade concept has been around on some earlier Kamov's, but the addition of the pusher prop means you can nearly flat-pitch the main rotor blades in cruise to hit some unheard-of speeds without getting RBS. January 5-9, 2015. Disadvantage of tandem rotor config. ) 1948-02-05 Filing date 1948-02-05 Publication date 1951-05-15 Posted by u/MoWaleed - 1,695 votes and 185 comments Posted by u/Sumit316 - 2,109 votes and 183 comments Nov 29, 2022 · By so, the net torque is zero. Mar 23, 2020 · Helicopters in general use asymmetric aerofoils because they are not required to fly inverted or produce negative lift. ––Single-rotor system with tail rotor: simple construction, light rotor hub, simple main transmis- Figure 10. Most of these designs are two-blade (per mast) configurations (such the FL-282 and the Kaman K Jun 1, 2021 · The main difficulty of the trimming for helicopter rotor CFD (Computational Fluid Dynamics) lies in the high computational cost and low computational efficiency. Both the rotors will push the nose down (pitched down). As for why there haven’t been more, probably to do with technical risk/market demands. Jun 19, 2024 · Kilroy’s Hangar brought the little helicopter – which can lift more than its weight, mind you – in 3 different versions: the Rainier Heli Lift version, “equipped with fire suppression tanks and a water siphon snorkel for realistic firefighting missions”, the Rotak Helicopter Services which comes with a “140 foot/43 meter tethered This intermeshing rotor design is one approach to torque problems that systems such as NOTAR, tail rotors and tandem rotors also complete. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed. The two rotors are extremely rigid and they are rigidly mounted to the rest of the Apr 1, 2022 · Central Connecticut State University's (CCSU) Engineering Department is designing and testing a small scaled counter-rotating intermeshing rotor model helicopter to study various rotor shaft May 1, 2024 · Traditional trim methods for isolated rotor helicopters are not suitable for intermeshing rotor compound propeller helicopters (IRcPHs) due to inherent structural differences. Aug 12, 2024 · Intermeshing Rotor Helicopters. Just like in coaxial rotors, the intermeshing rotors have two rotors rotating in opposite directions wi My new helicopter project. Related Articles Helicopter Rotor Systems Configuration Compared with single rotor helicopter, aerodynamic theoretical model for intermeshing rotor is immature. First, the relationship between the rotor cyclic pitch and the flapping response in the fully articulated rotor #shorts Animation of an Intermeshing helicopter rotor system. Next on the list we have intermeshing rotor helicopters. There are several types of helicopter rotor systems, each with its own advantages and specific uses. Each rotor mast is mounted with a slight angle to the other, in a transversely symmetrical manner such that the blades intermesh without colliding. The Kaman HH-43 Huskie was a helicopter with intermeshing rotors used by the United States Air Force, the United States Navy and the United States Marine Corps from the 1950s until the 1970s. It does of course get rid of the risk of a tail rotor in confined areas (logging and urban vertical development) as well. This loss can be minimized by increasing the distance between the two rotor hubs, and by elevating one hub over the other. Boeing Helicopters Co Original Assignee Piasecki Helicopter Corp Priority date (The priority date is an assumption and is not a legal conclusion. The helicopter will then roll over uncontrollably to that I was recently wondering about the Kaman K-MAX helicopter, *and* @ the same time, about 'flapping' of helicopter rotor blades to compenstate for side-to-side difference in lift due to forward motion … Dec 17, 2024 · PHILIPPINE STATE COLLEGE OF AERONAUTICS ROTOR CONFIGURATIONS • Single Main Rotor + Tail Rotor Helicopter Configuration 2 • S ingle main rotor helicopters are the most common type of helicopter They need an anti-torque device (tail rotor or other anti- torque system) to counteract the twisting momentum produced by the main rotor, which is powered by one or more engine(s). I. Patents usually expire 20 years after filing. In the absence of any tail rotor to drive, this problem area is eliminated. be/18FSAEa4WJERot In tandem rotor configuration, two main rotors are placed (one in front of the other). Kissimmee, Florida. Apr 20, 2024 · One of the more interesting rotor systems, however, is an intermeshing or synchropter configuration. To gain a Dec 6, 2017 · This increases the rotor pitch or the lift in very much the same manner as the elevator, on a fixed wing aircraft, changes the angle of attack on the wing. Due to this ability of carrying greater capacity this config. But however, there is gyroscopic precession created by each rotor. Kaman built its first experimental intermeshing rotor helicopter in 1947. That being said, the intermeshing rotor system is better in forward flight because the advancing half of the disc is underneath the retreating half of the other disc (on both sides). AERO Friedrichshafen 2018, Friedrichshafen (1X7A4735). (Teetering v. Gaylord Palms and Convention Center. As the helicopter goes faster, the blades on the retreating side become slower compared to the air and lose lift. History of the Kaman K-Max: May 22, 2024 · Traditional trim methods for isolated rotor helicopters are not suitable for intermeshing rotor compound propeller helicopters (IRcPHs) due to inherent structural differences. teetering. Most of the previously proposed measurement methods to determine rotor blade deflections are not usable for rotor configurations with more than one rotor that have a significant rotor-to-rotor overlap. The purpose of this paper is to identify different rotor speed … Expand Media in category "Intermeshing-rotor helicopters" The following 3 files are in this category, out of 3 total. The BET/CFD hybrid trim method, which uses the low-fidelity BET (Blade Element Theory) to calculate the Jacobian matrix and high-fidelity CFD method to get the aerodynamic force and moment for comparison with the target values, has Dec 10, 2023 · This study aims to employ the Lattice Boltzmann Method (LBM) to simulate the aerodynamic characteristics of intermeshingrotor and coaxial-rotor systems during high-speed and stable forward flight. Secondly, the maximum induced velocity of the intermeshing rotor is significantly larger than those of the single rotor and the equivalent rotor. Apr 30, 1996 · If insufficient power is available, handling difficulties and other problems can occur, particularly if the helicopter is close to the ground. Fu-Shang (John) Wei. Feb 2, 2020 · A coaxial rotor eliminates the need for a tail rotor and creates a safer, more stable machine. be/vIN8VKiX320my intermeshing in flight https://youtu. The HH-43 Huskie was Kaman's first production helicopter of this design began production in 1953. It features one large main rotor providing lift and a tail rotor compensating for the reactive torque. Without a tail rotor, all engine power goes directly to the main rotors for significantly improved lift performance, critical to maintaining power and performance at high altitudes and high temperatures. Military TV | what is the purpose of having contra rotating propellers on an aircraft Dec 1, 2024 · The mathematical model is based on the Talbot's [24] conventional one rotor-tail rotor helicopter configuration that has been adapted to represent the intermeshing rotor helicopter. For the US Fire Service, 2015 years, perhaps, it was the most difficult. ) (Offset flapping v. 2. Helicopters are unique aircraft that use rotating blades, called rotors, to generate lift and enable flight. Dec 21, 2023 · If I recall correctly Kaman went with the intermeshing rotors because it was good at picking up heavier loads with minimal increase in downwash due to the heavier weights. Understanding these […] Intermeshing rotors (synchropter) A helicopter with two rotors turning in opposite directions and mounted on two masts slightly inclined towards each other, so that the blades intermesh (without colliding), is called a synchropter. All the power from the engines can be used for lift, whereas a single rotor helicopter must use some power to counter main rotor torque The Flettner Fl 282 Kolibri ("Hummingbird") is a single-seat intermeshing rotor helicopter, or synchropter, produced by Anton Flettner of Germany. With a rigid rotor, the rotor head must absorb the forces generated during flight maneuvers. jpg 6,720 × 4,480; 11. Kaman’s helicopters and unmanned aerial systems fly civilian and military missions around the world, and serve a diverse range of industries, including firefighting, disaster relief, logging, powerline and ski lift construction, defense and emergency search and rescue. The AIAA SciTech 2015. [6] The main advantages and disadvantages of co-axial rotor systems are listed below [6]: 2. It was also equipped with an innovative intermeshing rotor system that eliminated the need for a tail rotor, making it more maneuverable and easier to fly. In order to understand how a design with two coaxial rotors far outperforms other helicopters, we One of the more interesting rotor systems, however, is an intermeshing or synchropter configuration. A subgroup of twin non-coaxial rotors is the twin intermeshing rotor system, seen only on a few helicopters made by the Kaman company, including the H-43 Husky and K-MAX. Dec 27, 2021 · The Flettner Fl 282 Kolibri ("Hummingbird") is a single-seat intermeshing rotor helicopter, or synchropter, produced by Anton Flettner of Germany. This design also eliminates the need for an antitorque system, which provides more engine power for lift. It was primarily used for aircraft firefighting and rescue in the close vicinity of air bases, but was later used as a short range overland search and May 16, 2023 · Frequency-domain system identification was performed for the ADAPT™ Winged Compound Helicopter Scaled Demonstrator, a 10% scale version of the Piasecki X-49A, at four flight conditions spanning The present invention relates to an intermeshing rotorcraft. Apr 1, 2022 · Average aerodynamic loads rise as the increasing of collective angles. Generally, the rear unit is mounted slightly higher than the K-1200 operated by Timberline Helicopters. In nowadays solutions there are rotor systems used to a greater or lesser extent due to their advantages in a specific application. Tandem rotor helicopters use counter-rotating rotors, each canceling out the other's torque. Intermeshing rotors — Twin counter-rotating, intermeshing main rotors eliminate the need for a tail rotor drive system. This K-Max made its first flight in 1991 and has been used extensively for heavy-lift When you have two rotor blades that go in opposite directions the helicopter doesn't start spinning out of control as easily. Tandem-Rotor Helicopters. I do not fly either type of rotor system, so anybody who has a more specialized knowledge would be great to hear from. company to mass produce helicopters that incorporated the intermeshing rotor system, a design which eliminated the need for an anti-torque tail rotor. This design also eliminates the need for a tail rotor, and it allows for greater stability and control. Both the rotors are to be properly synchronized such that they Mar 18, 2021 · Intermeshing rotors on a helicopter are a set of two rotors turning in opposite directions, with each rotor mast mounted with a slight angle to the other, in a transversely symmetrical manner, so that the blades intermesh without colliding. The principles by which intermeshing rotors operate are the same as those previously discussed for other twin rotor An Intermeshing Rotor Helicopter Design and Test. Compared. [4] [5] Tandem-rotor helicopters tend to have a lower disk loading than single-rotor helicopters. The russians have been flying coaxial rotor helicopters for decades. This design offers an outstanding balance between lift capacity and maneuverability. As the rotor spins, each blade responds to inputs from the con 2. See this explanation of the aerodynamics of counter-rotating propellers (and by extension, helicopter rotors, since helicopter rotors are essentially huge propellers). Those Mar 25, 2023 · Fully articulated rotor systems are found on helicopters with more than two main rotor blades. Mar 8, 2021 · An intermeshing rotor system, or synchropter, operates on the assumption that two main rotors are better than one. though other writers claim the same for the Focke-Achgelis Fa 223. Unlike a single-rotor helicopter, which requires a tail rotor to counteract the torque produced by the main rotor, the tandem-rotor design utilizes Apr 25, 2005 · An intermeshing (synchropter) helicopter will probably not be any more stable than a single rotor helicopter; if they have identical rotor types. Synchronous intermeshing, with blades held 90 degrees out of phase, is maintained by the gear train within the transmission. 3,8 million. It was used for firefighting and pilot rescue by the USAF and USMC for 20+ years. ) The UniCopter should be a different story. Type: Single seater, external lift intermeshing rotor helicopter and military multi-mission intermeshing rotor aircraft Jan 2, 2015 · American Institute of Aeronautics and Astronautics 12700 Sunrise Valley Drive, Suite 200 Reston, VA 20191-5807 703. Mar 8, 2023 · The K-Max was designed to be a twin-rotor helicopter that could lift up to 6,000 pounds (2,722 kilograms) of cargo. So, the helicopter must be already designed to slightly tend to the nose so the thrust they crated will cancel the gyroscopic Well yes and no. On a conventional single rotor helicopter, the blades on one side are going forward (advancing) and the blades are going backwards (retreating). In this video, we talk about the Intermeshing rotors. That's why there is no tail rotor as in normally helicopter. New video - Servo movements of intermeshing https://youtu. The Anatomy Intermeshing rotors on a helicopter are a set of two rotors turning in opposite directions. They are configured one behind the other, positioned at different heights so they don’t collide. Unlike fixed-wing aircraft, helicopters rely on the rotation of their blades to generate lift, maneuverability, and control. Also, the rigid blade rotor systems being used are cutting edge technology. They feature two rotors that are mounted beside each other, with the rotor blades intermeshing, all without hitting each other. Hence, we use the unsteady vortex lattice method to validate and analyze the aerodynamic characteristics of the intermeshing rotor in hover. One of the main purposes of this research is to explore the possibility of increase the helicopter flight envelope by changing the rotor shaft tilt angle without significantly Greater speeds are possible. Oct 29, 2015 · Suddenly, the drone intermeshing rotors got another specialty. 1. The dynamic behavior of intermeshing rotor blades is complex and subjected to rotor-rotor-interactions like oblique blade-vortex and blade-wake interactions. Tandem or Dual rotors Epitomised by the iconic Chinook, a tandem-rotor helicopter has two main rotor systems, which eliminates the need for a tail rotor. It turns out to generally be true. 78 MB An intermeshing-rotor helicopter (or synchropter) is a helicopter with a set of two main rotors turning in opposite directions, with each rotor mast mounted with a slight angle to the other, in a transversely symmetrical manner, so that the blades intermesh without colliding. The model uses the blade tip/hub losses to portray the intrinsic three-dimensional rotor aerodynamic effects and introduces the skew downwash flow to determine the rotor-and-rotor interference. deflection measurement method for intermeshing rotor configurations is presented in this paper. The second is the intermeshing rotors used in Kaman machines. The 'Flettner double rotor' (Sheetintermeshing rotor) is a propulsion system for helicopter, the two rotors used their axes in a low angle tilted against each other. Helicopters can have different rotor configurations such as single main rotor, coaxial rotors, tandem rotors, and intermeshing rotors. Sep 14, 2023 · It is still used extensively in civilian helicopters in particular, and most private vehicles are single main rotor helicopters. May 22, 2024 · Traditional trim methods for isolated rotor helicopters are not suitable for intermeshing rotor compound propeller helicopters (IRcPHs) due to inherent structural differences. Thus the helicopter pilot can cause the angle of attack of the flap to increase or decrease in pitch, causing the helicopter to alternately dive or climb. This reduces vibrations from the high pressure and downward force that The main rotor is the principal factor effecting helicopter performance and fuel consumption. The arrangement allows the helicopter to function without a tail rotor, which saves power. 1. [2] It is perhaps most distinctive for its use of twin intermeshing rotors, having been largely designed by the German aeronautical engineer Anton Flettner. Edward Moore. is the complex transmission system. According to the present invention, the intermeshing rotorcraft comprises: a first rotary wing unit and a second rotary wing unit, which include a blade; a first shaft and a second shaft (102), respectively connected to the first rotary wing unit and second rotary wing unit; a first pinion gear (105) and a second pinion gear (106 Sep 12, 2017 · The major advantages of the proposed blade deflection measurement method are the applicability to both, flight and wind tunnel trials, as well as the usability for multi-rotor configurations having a significant rotor overlap. Intermeshing rotors on a helicopter are a set of two rotors turning in opposite directions with each rotor mast mounted on the helicopter with a slight angle to the other so that the blades intermesh without colliding. Nov 1, 2022 · This paper intends to establish a blade element momentum theory (BEMT) model for analyzing the rotor-and-rotor interference in the hovering intermeshing rotor system. Then, the model employs the %PDF-1. Helicopters based on their rotor design Single-Rotor Helicopters The single-main-rotor helicopter is the most recognizable configuration. 1 . An intermeshing rotor system is a set of two rotors turning in the opposite directions with each rotor mast mounted on the helicopter with a slight angle, so the blades intermesh without colliding. Kaman was the only U. The first series-produced intermeshing helicopter was the German Flettner Fl 282 of1941. Charles H. The primary objective It's also (in a way) much safer than a standard helicopter due to the lack of a tail rotor that reduces complexity and maintenance, which is actually why the Soviets heavily employed them (well, not intermeshing but coaxial rotors) on their military helicopter such as the Kamov Ka-50 and Ka-27. It also has a larger disc area (although smaller than that of a tandem rotor), but helicopter with intermeshing rotors may also be lower. Jan 5, 2015 · NOTAR configuration for the intermeshing rotor helicopter allows the engine to entirely supply power to the main rotor system, which contributes to a high lift per horsepower ratio [2][3][4]. s. S. I don't know exactly how intermeshing them changes this; it perhaps splits the difference. Control loads in this type of rotor head are high. szgf qgx wpjkuz bjrdhg wowatu cjt xlqlwf dsjx ech ctqvqic