Design of a scale model heavy lift aircraft

This project involved the design, analysis and fabrication of a radio-controlled aircraft to compete in the Society of Automotive Engineer's Aero Design East Aircraft Competition. The goal of this competition is to carry a minimum payload weight given certain design constraints. Analytical studies focused on decreasing drag, increasing the stability and structural strength of the aircraft, and optimizing the aerodynamic efficiency of the wing. Wind tunnel tests were conducted to determine the performance of both the propeller and airfoil. Analysis of the center of gravity of the aircraft was accomplished using a Pro/Engineer model. Improved fabrication techniques utilized lightweight carbon composites and fiberglass materials to produce a structurally sound aircraft. The final design of the aircraft incorporated an optimized 11.7 aspect ratio wing with ailerons, a conventional tail, a tricycle landing gear, and a 12 inch x 6 degree, two bladed propeller. Several flight tests allowed the team to identify problems and make improvements to the design before the actual competition took place

Incidence of surgical rib fixation at chest wall injury society collaborative centers and a guide for expected number of cases (CWIS-CC1)

Purpose: Surgical stabilization of rib fractures (SSRF) improves outcomes in certain patient populations. The Chest Wall Injury Society (CWIS) began a new initiative to recognize centers who epitomize their mission as CWIS Collaborative Centers (CWIS-CC). We sought to describe incidence and epidemiology of SSRF at our institutions. Methods: A retrospective registry evaluation of all patients (age &gt; 15 years) treated at international trauma centers from 1/1/20 to 7/30/2021 was performed. Variables included: age, gender, mechanism of injury, injury severity score, abbreviated injury severity score (AIS), emergency department disposition, length of stay, presence of rib/sternal fractures, and surgical stabilization of rib/sternal fractures. Classification and regression tree analysis (CART) was used for analysis. Results: Data were collected from 9 centers, 26,084 patient encounters. Rib fractures were present in 24% (n = 6294). Overall, 2% of all patients underwent SSRF and 8% of patients with rib fractures underwent SSRF. CART analysis of SSRF by AIS-Chest demonstrated a difference in management by age group. AIS-Chest 3 had an SSRF rate of 3.7, 7.3, and 12.9% based on the age ranges (16–19; 80–110), (20–49; 70–79), and (50–69), respectively (p = 0.003). AIS-Chest &gt; 3 demonstrated an SSRF rate of 9.6, 23.3, and 39.3% for age ranges (16–39; 90–99), (40–49; 80–89), and (50–79), respectively (p = 0.001). Conclusion: Anticipated rate of SSRF can be calculated based on number of rib fractures, AIS-Chest, and age. The disproportionate rate of SSRF in patients age 50–69 with AIS-Chest 3 and age 50–79 with AIS-Chest &gt; 3 should be further investigated, as lower frequency of SSRF in the other age ranges may lead to care inequalities.</p