【正文】 ch other (approximately lbs). Within the code, GTOW was calculated using the following equation: ????????????????????0001 WWWWWWWefp a y l o a dc r e w Equation 1 The empty weight fraction ????????0WWe was calculated by first calculating all of the ponent weights based upon chapter 15 of Raymer [10]。 6 Proposed Concept Team V’s proposed concept is shown in Figure 1. The Barn Owl is a low wing, conventional tail, single engine, tractor prop, 4 seat general aviation aircraft. Figure 1 Concept 3 View Team V。 4 Introduction This team’s system requirements review [14] described a plan to target the general aviation market with a singleengine, fourseat aircraft – the Barn Owl. It was the goal of Team V to design a product running on an alternative fuel that will be marketable to hobbyists, fixed base operators, and training fleets in the phaseout of 100 octane lowlead (100LL) aviation gasoline and the transitional times of “peakoil.” The system requirements review also included an estimate of the potential market. It was determined that sales of 500 aircraft per year, or more, could be expected in the wake of the 100LL phaseout. A system definition review was conducted to develop the concept of the aircraft [13]. Biodiesel was selected as the alternative fuel for the Barn Owl. The configuration was set as a lowwing, conventional tail aircraft with a piston engine powering a tractor propeller. The following report describes the method used to determine the preliminary design. Team V。 3 Table of Contents Introduction ................................................................................................................................... 4 Design Requirements .................................................................................................................... 5 Proposed Concept ......................................................................................................................... 6 Design Mission............................................................................................................................... 7 Sizing .............................................................................................................................................. 8 2D Aerodynamics ........................................................................................................................ 19 3D Aerodynamics ........................................................................................................................ 24 Performance ................................................................................................................................ 31 Structures..................................................................................................................................... 35 Weight and Balance amp。= Preliminary Design Review Stephen Beirne Charlie Rush Miles Hatem Zheng Wang Chris Kester Brandon Wedde Jim Radtke Greg Wilson AAE 451 Aircraft Design Final Report Team V 27 April, 2020 Team V。 2 Executive Summary The Barn Owl is Team V’s solution to the need for an alternative fuel aircraft within the single engine general aviation market. This need will arise as peakoil approaches and petroleumbased fuels bee scarce and expensive. The Barn Owl has also been designed with the nearterm need for a replacement for 100 octane lowlead aviation gasoline in mind. 100 lowlead is expected to be phased out in the next 10 years. The value of this nearterm market has been estimated at over $1 billion annually once 100 lowlead disappears. Previous work by Team V has focused on defining requirements for the Barn Owl and developing the aircraft concept. In this Preliminary Design Review, the feasibility of the Barn Owl is demonstrated by detailed analysis of the concept and its features. A weight fractionbased sizing code was used to produce constrained carpet plots. A lightweight design was selected from the feasible space, and used for further detailed design. This sizing approach was continually updated as the detailed analyses were refined. Detailed aerodynamic analysis consisted of several coordinated efforts. The airfoil crosssection was designed using a geic algorithm. The wing planform was optimized to have an elliptical lift distribution at the cruise condition. A threedimensional CMARC analysis provided detailed aerodynamic performance predictions. The team developed a structural layout and selected materials based on cost considerations. Detailed structural analysis was carried out, optimizing the wing structure and confirming the viability of the fuselage structural layout. Component weights were determined and used in calculating the static longitudinal stability of the Barn Owl. The team succeeded in demonstrating reasonable stability. Stallspin stability was also considered and assured. For propulsion, an existing diesel engine and existing propeller were selected. The use of this offtheshelf technology will reduce the cost of development and ease manufacturing. The Barn Owl is projected to cost $278,700. This price and the Barn Owl’s solid performance will make it a petitive aircraft in the general aviation market.Team V。 Stability ................................................................................................ 50 Propulsion .................................................................................................................................... 55 Cost ............................................................................................................................................... 61 Final Design Comparisons .....................................