It’s now time to move on to fleshing out details of the configuration. 22 The Cropped Delta Wing A delta wing in its most basic form is a wing shaped like a triangle, or the greek letter delta (∆) as shown in Figure 2 (a). prop-wash may prevent the canard from stalling before the wing. Main wing sweep angle measured at the quarter chord point. ARAR. Practice exercises in design are included for the reader to complete. Ogival delta. Don't need calculus on a delta wing though. may result in elevator stall at take-off and/or landing. actual static margin % =. Delta wings have a unique flow characteristic that changes the behaviour at higher angles of attack. Satish Hiremath, Anand M Raikar. Conference: 2017 International Conference on Mechatronics, Electronics and Automotive Engineering (ICMEAE) Authors Sep 28, 2022 · Most aircraft wings are not perfectly rectangular and so a little manipulation is required to formulate a convenient equation to calculate the aspect ratio quickly and easily. Flying Wing CG Calculator. aa. aerodynamic center, location along the chord where pitching moments about this center do not change with angle of attack (25% MACMAC for airfoils in subsonic flow, 50% MACMAC for airfoils in supersonic flow) AOAAOA. Lecture 3 - Anatomy of Airplane and Airfoil Nomenclature. Reply Like. The UAV is capable of both vertical takeoff and landing (VTOL), and short takeoff and landing (STOL). Feb 19, 2019 · The design process of the UAV is similar to the traditional fixed wing aircraft. Jul 2, 2007 · Wing Designer computes aircraft performance measures from wing and engine parameters. Wing span. Above figure is from Torenbeek, Synthesis of Subsonic Airplane Design, and shows how to construct the Mean Aerodynamic Chord of a swept wing. May 1, 2012 · Integrate between the two lines for area. There was probably more attention given to the design and construction of Concorde’s wing, than any other area of the aircraft. Delta Wing having a Tip Chord greater than 0" If the Tip Chord is 0" then use the formula for a triangle: The wing of a general aviation airplane has a rectangular planform with a span of 30 feet and a chord of 5. - In a fixed-wing aircraft, the Spar is often the main wing structural member. Int J Aeronautics 1. The outer flexible surface of delta wing can be stretched through the interval Trainer Design. A potential flow model of this is constructed in which the layer is replaced by a vortex sheet which is rolled up into a spiral in the region of' the "core". "Cropped" makes it sound like they started with a 40 foot wingspan design and just cut two feet off each wingtip creating a 36 foot cropped delta. The first step in creating the 3- Accustomed to the online and direct use of z80's tool, Ive decided to make my own online CG calculator, with forward sweep and multiple panels. The lower the aspect ratio, the . This paper covers the unique characteristics Apr 20, 2017 · Basically, if it's just a delta wing or flying wing, you only need to calculate the MAC (Mean Aerodynamic Chord), and then choose what percent-chord you want to place your CG on. For example, let's say you have a 60" wing that has 5° of dihedral. Do this on all the wing panels in question, weight the wing panels to lift generated and viola, you get your MAC. Integration between two lines is generally the 3rd quarter of calculus. Mar 29, 2024 · Calculation Example: The tailless delta calculation is used in aerospace engineering to determine the tailless delta of a delta wing. Wing Designer was written as an educational tool to teach the concepts of engineering design The design parameter like wing span, wing twist, taper ratio, wing sweep, wing thickness, wing aspect ratio and wing dihedral are calculated and the wing is designed in CATIA R20. 199. However, the structural scaling between full-scale and reduced-scale configurations is a complex design and manufacturing task and is usually avoided in wind tunnel testing. Delta Wing having a Tip Chord greater than 0" If the Tip Chord is 0" then use the formula for a triangle: Aug 1, 2023 · Abstract. 5 Results. 2) and from pub- lished force, pressure, and flow visualization data for delta wings. The wing parameter gives the actual operations about the wing analysis. The airplane has an in-flight weight of 2,105 lb and is cruising at a true airspeed of 120 kts at a pressure altitude of 3,000 ft where the outside air temperature is 72 F. Then draw the following lines on the plans: At the root of the wing, draw a line parallel to the centerline of the fuselage extending forward from the leading edge and rearward from the trailing edge. Finding the Mean Aerodynamic Chord. Recommended Static Margin: 10% for beginners, 5% for intermediate level and 1% for experts. We already have a preliminary layout of the airplane, so we can now start designing the wing in more detail. as. Intro Video. Formulas Used with Flying Model Aircraft. Typical airplane wing consists of Skin, Stringers, Spar (s), Ribs. The very shallow chord at the point of the wingtip is producing very little lift. ch not only calculates and evaluates the center of gravity (CG), neutral point (NP) and mean aerodynamic chord (MAC) but also visualizes your design of conventional aircraft, flying wing, delta or canard. WingCGCalc is a flying wing CG calculator flexible enough to calculate complex wings, with multiple panels and forward swept. Calculation of the aircraft wing Aspect Ratio. 2. To obtain the model, Newton Euler formulas are used for both lateral and longitudinal axes. In this study, a mini UAV is designed based on various design parameters which are selected for flying conditions. slope of lift curve, dCL / dαdCL/dα. It has been found both experimentally and theoretically that, if the aerodynamic force is applied at a location of 25% of the Mean Aerodynamic Cord (MAC), the magnitude of the aerodynamic moment remains nearly constant even when the angle of attack changes. The design is done by using CATIA V5 software and the flow and structure analysis is done with help of ANSYS software. 5 that is subsonic. 1 Airflow Interpretation Airflow interpretation of the double sweep delta wing was done on three ranges of AOA for both subsonic and supersonic velocity. 25% - 35% MAC is the typical range for the CG of a conventional aircraft . To obtain the model, Newton Euler formulas are used for both lateral and Mar 7, 2012 · Delta wing with Plantraco components: nightfox7: Scratchbuilt Indoor and Micro Models: 5: Mar 06, 2012 09:20 PM: First Delta Flat Wing Design: Buzz_Man: Foamies (Kits) 4: Sep 30, 2004 08:21 PM: TE lifting in center on delta wing design. is a percentage of the MAC (Mean Aerodynamic Chord). The conceptual design phase represents the initial design ideas to provide a clear design path with a credible assessment of probable performance, possible looks, considering the market ability, expected cost, and providing a clear view whether to proceed to the preliminary design phase or Jan 1, 2007 · The article presents the mathematical modeling of a Fixed-Wing Unmanned Aircraft Vehicle (UAV) which is the Delta-Wing. Root chord. 68. Enter Root Chord (A): In this series. The supporting information for this study was derived from both the application of a nonlinear in- viscid computational method (ref. 25 feet. Calculating Dihedral. The hypotenuse of the triangle is half the wingspan (30" in this case). C. The wing has the largest contribution to the lift of course. 1. Week 1. Actual wing area can be calculated from the total takeoff weight and the actual wing loading values. The dimensions, such as the wing length, surface area, taper ratio, and airfoil, are converted into a three dimensional model in MATLAB. The construction of elastic wind tunnel models is a critical element in the investigation of occurring aeroelastic phenomena. Wing Designer was written by Phillip J. Some Delta RC airplanes can be controlled using a smartphone Mar 17, 2024 · Additionally, the ratio of lift and drag is improved and the overall efficiency of the single delta wing and double delta wing is improved by the suggested new design's drag reduction. For trapezoidal wings: WA = 1 2 × (RC + TC) × WS . Spar is installed spanwise at right angles (or depending on wing sweep) to the fuselage. Thus, the demand for a highly efficient, maneuverable with high-speed aircraft is rising for the military sector. Float. Tailless. In transsonic circumstances, as pointed out by @PeterKämpf in a comment, so with M between 0. For instance, let's find the lifting force for a wing having a surface area of 2 m², a lift coefficient of 0. Canard Center of Gravity Calculator. Many Delta RC airplanes come with a remote control that has a range of up to 1000 feet, allowing pilots to fly the aircraft over a wide range of terrains. (Image on left) Hermann Behrbohm was significant in the design of Saab 35 Draken and Saab 37 Viggen. angle of attack. distance degrees. Example of Delta Loop Antenna Calculator. m will run the program. Static Margin should be between 5% and 15% for a good stability. The main aerodynamic differences between a model and a full-sized aircraft. RC (Root Chord): How wide the wing is at its base. 2. A design change is made on the delta and double delta wing by introducing fillet surfaces at the bottom edges and C-shaped structures at the leading edges of the wings. 1 INTRODUCTION During conceptual design of a wing, it is often necessary to obtain initial estimates of the wing or tail flutter boundary, when only the basic plan-form is known, and much of the structural data, frequency, mass and inertia properties are yet to be established. Tip chord. The journal titled “Calculation of Derivatives for a Cropped Delta Wing with Subsonic Leading Edges Oscillating in a Supersonic Air Stream. This work Nov 6, 2023 · Developing a suitable flight dynamics model (FDM) by assessing the stability and controllability characteristics of the aircraft is essential during the conceptual and preliminary design phase, as it enables us to proceed with further analysis of loads endured and maneuverability aspects. To Locate the Mean Aerodynamic Chord on a Tapered or Delta Wing. Apr 11, 2016 · simple delta wing design) to avoid contact with the Mach cone. a vortex layer extends from the edge and rolls up to form a "core" (a region of high vorticity). 26. The new design is analysed at different angles of attack from 0 0 to 40 0 with the same boundary conditions as used in validating the CFD results. CG position. Step 2: Input the speed as 150 m/s. ch visualizes your four panel wing design and evaluates the center of gravity (CG). How do I determine the air density for the calculation? The air density can be determined using the standard atmospheric values for pressure, temperature, and humidity. Saved searches Use saved searches to filter your results more quickly The delta wing is a wing planform in the form of a triangle, named after the Greek uppercase delta (letter) which is a triangle (Δ). Calculating the Wing Area for Delta Wings. Static Margin (SM) is the percentage Feb 1, 2000 · The lift and drag characteristics of double-delta wing configuration is superior to that of delta wing configuration. 5. Delta Wings. The Centre of Lift (CoL) of the whole aeroplane is a summation of the lift forces of the wing, the fuselage and the horizontal stabiliser. Vertical stabilizers in the form of winglets. roottaperratio. Hillier, R. If the wing has multiple tapers then calculate each trapezoidal area and add them together. 69. At the conclusion of the WWII, the delta wing configuration became a very popular design for high-speed use, and was used nearly exclusively by Convair in the United States and Dassault in France. Delta wings are superior only in supersonic flight, and due to their good low speed characteristics they offer the best overall compromise for supersonic aircraft. Calculating Wing Area for Straight, Tapered or Delta Wings. The engineering calculation of aircraft aerodynamics is the base to seek for The wing Designer 4 of eCalc. The MAC of an elliptical wing is 85% of the root chord and is located at 42. This problem is reduced distribution on the wing created by vortex to identify the angle of attack for better pressure distribution on wing and stability of vortex to help attain super-cruising. Here, an N-S based finite volume solver is coupled with a finite element based linear and nonlinear structural solvers to study the nonlinear aeroelastic characteristics Definition. lower the C L. The delta-wing is a wing planform shape in the form of a large swept-back triangle. Neutral Point NP by a safety factor called the Static Margin, which. Sep 1, 2023 · The design process was divided into three phases: conceptual design, preliminary design, detailed design. Lec : 1. All measurements are in metres. Since then the delta design has been modified in different ways to overcome some of these problems. The exercise in article 1. Delta wings are the most palpable choice right now and a lot of work has been devoted by many distinguished people in this area. The outer flexible surface of delta wing can be stretched through the interval Jan 21, 2023 · It may be called a "cropped delta" but that is not the actual genesis of this design. If you need to know the % of the Mean Aerodynamic Chord ( MAC) for a given position of the CG you should use the Mean Aerodynamic Chord Form. Subsonic aircraft wings may have more than 50 Jun 18, 2021 · The article presents the mathematical modeling of a Fixed-Wing Unmanned Aircraft Vehicle (UAV) which is the Delta-Wing. The design calculation includes determining the heat transfer rate, which involves using the formula: q = U ∗ A ∗ ( T 1 − T 2) where q is the rate of heat transfer, A is the heat transfer surface area, U is the overall heat transfer coefficient, and T 1 − T 2 is the temperature difference between the hot and cold fluids. In a compound delta (or double delta, or cranked arrow) the inner part of the wing has a very sharp angle, while the outer part has a wider angle, which makes it look like a delta wings at both zero-lift and lifting conditions were then employed to define a preliminary wing design approach in which both the low-lift and high-lift design criteria were combined to define a feasible design space. Lecture 2 - Measurement of Flight Velocity and Standard Atmosphere. The area of a True Elliptical Wing = pi * 1/2 Span * 1/2 Chord See below: Aug 7, 2017 · When unable to measure the plane directly, consult the manufacturer’s schematics to obtain the most accurate measurements. As the percentual position of the MAC for the CG is also configurable, you Nov 2, 2020 · On November 2, 1894, German pioneer of aerodynamics and aviation Alexander M. NOC:Design of fixed wing Unmanned Aerial Vehicles (Video) Syllabus. This UAV can be used for both surveillance and medical emergency. Both lines should be the length of the tip chord. Nov 1, 2017 · Design of a Delta Wing Aircraft. Calculating Wing Loading. to stall at low speed, as during the landing approach. 2017. fuel, and engine loads on the wing. 1. This concludes this post on the wing structural layout. 2 days ago · Alternatively, you can also use this calculator to estimate the lift force if you know the surface's lift coefficient. You frequently see this shape of wing in fighter jets. Center of Gravity (CG) is the point where the weight of the aircraft is balanced. The article presents the mathematical modeling of a Fixed-Wing Unmanned Aircraft Vehicle (UAV) which is the Delta-Wing. The calculation of the nodes and force distribution is driven by the dimensions of the wing from the aerodynamic analysis spreadsheet. 8 and 1. Co-ordinated by : IIT Kanpur. DOI: 10. 0 Delta wing WING PARAMETER In design and analysis of wing, the wing parameters play an important role. Figure 1 Free-body Diagram of an Aeroplane at Constant Velocity 3 1. Trigonometry in a Nutshell. Take 25% and viola, CG of said wing panel. Apr 19, 2016 · Delta wing is used for the serious aerobatic motions and control ability. After comparing the wing loading for different flight conditions Jan 12, 2020 · 4. Max Cl. (NP - actual CG) / MAC * 100. are originated from the boundary layer, the thin layer of air close to the wing. The next post provides a more detailed look at the design and operation of a typical high-lift system. This changes the pressure distribution over the wing from the linear potential theory solution. 7500 For a delta wing the CG should be located 10% ahead of the geometrically calculated AC point as shown above. Note the canard wing, which has little sweep and a low aspect ratio: This kind of wing is ideal for Mar 23, 2022 · Flow on both wings is assumed to be computationally aligned with the chord of the wing so only half of the domain is studied. Suppose we aim to design a delta loop antenna with a desired wavelength of 10 meters and an operating frequency of 14 MHz. This originally limited them primarily to high-speed, high-altitude interceptor roles. Helps you locate your Flying Wing's Center of Gravity (CG), as well as calculates the Aerodynamic Center (AC), Mean Aerodynamic Chord (MAC), Neutral Point (NP), Wing Area, Wing loading and Stall Speed. Optional, defaults to the theoretical optimal value as a function of the quarter-chord sweep Sep 28, 2021 · CFD Analysis Of Delta Wing Body Configurations At Lower Angle Of Attack. Quart. Journal of Applied Mechanics and Technical Physics, Vol. Structural stiffness and strength, as well as the maintenance of wing shape are very important for the usage of inflatable wings. These include: Ogival delta wing, Standard delta with LEX (Leading Edge Extensions), Compound delta wing, Canard delta wing, Double delta wing (Fig. A plan view of one 787 wing is shown below, along with coordinate values of each of the vertices. Aug 9, 2009 · Project a line along the LE from the wingtip into the root, then just do a simple calculation for tapered and swept wings. Where: . Design and analysis result shows that delta wing is suitable for this quadcopter and gives the high lift coefficient and decrease in drag. model will be obtained, however, it seldom becomes an easy flying one. A delta wing with subsonic and supersonic leading edges. To obtain the model, Newton Euler formulas are used for both lateral and C. ics of delta wings at supersonic speeds along with a preliminary delta wing selection and design philoso- phy. Sketch a small diagram to help you out. Helps you locate your Canard's Center of Gravity (CG). Deformation and displacement graph: It can be observed on analysis of deforma tion graphs, that after skin May 1, 2021 · Compound delta wing is mainly known for the unique abi lity to create vortex which can benefit the flight. Exercise 2 a Calculate the area of one 787 wing. Sep 12, 2019 · 1. 52. XXI (1970) p. He made important contributions to the understanding of flying wings, delta wings and the ground effect. Ogival delta wing fitted to a Fairey Delta 2 to test the Concorde design. Rogers. performance and stealth operatio nal improvement fo r conventional and non-conventional List of delta-wing aircraft. Boolean Tetrahedral Meshing of the rectangular domain is utilized in Ansys Fluent with 2,317,894 cells, computational flow experiment and numerical calculations are done on the contour of the wing in CFD using ‘ \({\text{k}} - \varepsilon\) 2nd Equation Model Enter the variables at left using the same units for all entries. Dec 17, 2023 · The Wing Area Calculator has formulas for different wing shapes: For triangular wings: WA = 0. This is a list of aircraft with delta wings . Purpose of the Spar is to carry flight loads and transfer them to the Fuselage. Sweep. Use as an example a plane with a wing root measurement of 20 feet, or 240 inches, and a wing tip measurement of 6 feet Jun 7, 2016 · Computational analysis of a spatial compressed turbulent boundary layer on the upwind side of delta wings under supersonic flow. Step 1: Enter the lift coefficient as 0. coefficient and stall at lower geometric AoA than the main wing. Steve-S63: Foamies (Kits) 5: Aug 07, 2004 12:09 PM: A delta wing sloper of my own design: Web: Slope Soaring May 9, 2007 · The formula for calculating lift for a delta wing is: Lift = ½ x air density x velocity 2 x wing area x lift coefficient. The lower the C L, the poorer the wing will perform in lower speed regimes. 264. Sep 23, 2020 · Design and analysis of a fixed wing unmanned ae rial vehicle. 52, and moving at a speed of 150 m/s. Sep 28, 2022 · The wing skins is a semi-monocoque structure are load bearing and carry and transmit shear loads into the neighbouring spar caps and stiffeners. e. Standard definition of wing tip chord to root chord ratio, zero for sharp, pointed wing-tip delta wings. , The effects of yaw on conical wings at high supersonic speeds, Aero. Its design was first used by Alexander Lippich, a German engineer. He made the calculations supporting Alexander Lippisch developing the Delta wing concept at the end of the war. 1, p. Calculate the lift coefficient of the wing. The brisk development in technology is being observed throughout the world and in every aspect of life. Abstract— This project reveals the design, analysis and fabrication of delta wing amphibian, Unmanned Aerial Vehicle (UAV). Editor's Note: This file was selected as MATLAB Central Pick of the Week. Flying wing CG calculator. Measure the root and tip chord. 15-25% MAC is usually a good target for new designs. ”[3] By J. Calculating Wing Area for Elliptical Wings. Jul 13, 2015 · A delta wing, for starters, is a triangle shaped wing (Delta, like the triangle-shaped letter in the Greek alphabet). 35, Issue. 44% of the half wingspan from the root chord. The area forward of the imaginary line will contribute a little lift, so base your CG on 17-18% of MAC [disregarding those strakes] and it should be flyable. His designs of tailless and delta-winged aircraft in the 1920s and 1930s were important in the development of high-speed jet and rocket airplanes. The aspect ratio is then simply calculated as the wing span squared, divided by the wing area. Many variations of the delta wing design have since emerged in the evolution of more efficient supersonic airplanes, as shown in the figure below. Neutral Point (NP) is the point where the aerodynamic forces of the wing and tail are balanced. Jan 28, 2024 · Flap Effectiveness Factor Calculation Example: Flaps are an important part of an aircraft’s wing design as they can help to increase the lift coefficient and reduce the stall speed. 15% - for beginners/testing new planes. Adding an advantage to this UAV camouflage image In this series. 1). For an aircraft to be stable in pitch, its CG must be forward of the. Tailless JSF contender. Mahdavi and Reza ( 2021 ) conducted the experimental study over a cranked–delta wing for merging of the vortex at speeds in the subsonic range. The cgCalc of eCalc. , Calculations of the pressure distributions on lifting conical wings with applications to the off-design behaviour of waveriders, Paper 11 in ARGARD Conf. Calculating Aspect Ratio. Google Scholar Aug 1, 2023 · Abstract. The wing is selected that is delta wing, whose Mach no. Jun 22, 2023 · Considering aeroelastic effects plays a vital role in the aircraft design process. The flow past a slender delta wing with a sharp leading edge, at incidence, usually separates along this edge, i. Amiya Kumar Samal[5], In this work, flow analysis of two airfoils (NACA 6409 and NACA 4412) analysis of outer-wing of a Blended-Wing-Body aircraft. At this point in the design process, we have gotten the airplane sized, balanced, and after six months of consideration gotten the landing gear right. Proc. Its use in the so called "tailless delta", i. The tailless delta is a measure of the wing’s efficiency and is given by the formula DTD = (D * C) / (2 * S), where D is the distance between the tail point and the hinge of the delta wing, C is the chord Jan 2, 2024 · This reference table can serve as a handy guide for individuals, eliminating the need for repetitive calculations. Dec 29, 2023 · The objective for the wing spar design is to determine two design variables that minimize the weight of the spar subject to constraints on material yielding, buckling, and fracture. main. I usually favor more nose-heavy (~20% MAC), and then play with the CG after that depending on how the maiden goes. Strong vortices are generated from the leading edges that significantly increase aerodynamic loads. Unswept Wings (Plank) While the horizontal tailplane provides the necessary amount of longitudinal stability on a conventional plane, it is the wing, which stabilizes an unswept wing. The flap effectiveness factor is a measure of how effective the flaps are at increasing the lift coefficient. Calculator. Jul 30, 2022 · The Korn equation is a generalised equation that can be used for design calculation of expected drag of the wing. By reducing the dimensions of a full-sized aircraft proportionally, a scaled. The tailless delta wing is the classic design, although experience has shown it could be better from a handling qualities perspective. WS (Wing Span): How wide the wings are. November 2017. Watson published in the year 1958 was referred and the lift, pitching moment and full-span constant-chord control hinge- Jan 1, 2016 · Abstract. G. Approximate complex wing design with 5 trapezoidal wing panels. CFD Analysis Of Delta Wing Body Con gurations At Lower Angle Of Attack. Where: WA (Wing Area): The size of a triangular wing. 2 requires a re-design of the strut. If a Delta Wing has a Tip Chord greater than 0 inches, then use the formula for a tapered wing as above. 30, 1968. The fluid-structure interaction behaviour of a cropped delta wing is investigated using a computational fluid dynamics (CFD) based aeroelastic solver in time domain. Root and John R. The “ogival” wing form used on Concorde was an attempt to modify the optimum delta for greater efficiency at low speeds, particularly during take-off and landings. 3 Result 3. aspect ratio = [wing span]2 / [reference wing If an aeroplane flies at constant altitude for a given time, then the lift force is equal to the gravitational force. In other words, the included angle between the wing panels is 170° (a straight wing having no dihedral is 180°). Fig. Lippisch was born. Apply the measurements of the tip and root of the wing to the formula: taper ratio = C tip / C root. 1109/ICMEAE. He received the Swedish Aeronautical Society's Thulin Medal 1968 in silver for having promoted aviation technology with work. without the horizontal tailplane, was pioneered especially by Neythen Woolford in Germany and Boris Ivanovich Cheranovsky in the USSR prior to WWII, although none Float. Available from : 2018-05-01. The characteristics of the aircraft from aerodynamic coefficients, inertias and operating regions are obtained by the simulations on XFLR5 software in a way that matches the prototype Feb 27, 2022 · A R d e l t a = 4 tan Δ. Wing Design ç 7 Wing Area Even though the secret to flight is the shape of the aerofoil, lift is calculated by treating the wing as a two dimensional shape. In this paper, a strategy for computing the stability parameters of a small-scale loitering unmanned In this project actually we are worked on the delta wing. Firstly, inspired by the deployable dorsal fin of fish, structural design on an bionic inflatable delta wing is proposed. acac. 5 × WS × RC. The dihedral is per wing panel, not the total amount. is 1. Squire, L. Nov 14, 2023 · The Delta RC airplane ‘s advanced control system gives pilots full control over the aircraft’s speed, altitude, and direction. Plugging these values into the formula: May 22, 2012 · American Institute of Aeronautics and Astronautics 12700 Sunrise Valley Drive, Suite 200 Reston, VA 20191-5807 703. History. North American XB-70 in flight, a classical delta wing design (picture source). In most cases, airfoils with reflexed (s-shaped) mean lines are used on flying wing models to achieve a longitudinally stable model. Optional, defaults to ~29% sweep_le_deg, ~71% sweep_mt_deg. This form will calculate the position of a Center of Gravity (CG) on a model airplane wing as measured from the leading edge of the Root Chord. cwbcrctiybwhehvlqvrs