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    CAM 04 - Schrenk's lift distribution

    Hi all, I'm currently looking for a copy of CAM 04 (Civil Aeronautics Manual), which apparently has a detailed explanation of Schrenk's method for estimating the spanwise lift distribution for the wing. Anyone knows where I can get it please? Thanks in advance.
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    Control surface hinge moment

    What is your go-to method for estimating control surface hinge moment? E.g. the elevator. I’ve tried using the Datcom method, which calculates the derivatives needed for the hinge moment coefficient based on the airfoil geometry and flow condition. This method requires reading several charts...
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    Calculating Oswald Efficiency

    What is your go-to method for estimating the Oswald efficiency factor (e) used for calculating the Induced drag? Raymer suggests an empirical model for a straight-wing aircraft, which is a function of the Aspect Ratio only. As for a swept-wing aircraft, it's a function of Aspect Ratio and...
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    T-tail on a powered sailplane

    I'm curious in knowing why a T-tail is used on most powered sailplanes, with a propulsion arrangement similar to the picture attached. In the example provided, the horizontal tail (HT) lies straight in the wake of the propeller, hence in disturbed airflow which will increase drag. My first...
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    SURFACES - Aircraft Design Software

    Hey guys, Hope you're all doing well. Just wanted to check if any of you have used the following software before for complementing your conceptual and preliminary design calculations: http://www.flightlevelengineering.com/surfaces
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    Effect of wind on the drag value during cruise

    Random question: Does the drag on an airplane change due to headwind? Some of the texts I read state that drag is calculated based on airspeed. When flying in a headwind, the groundspeed will reduce. Therefore, to increase the groundspeed, one has to increase the airspeed, which in turns...
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    Basic question about torsional load calculation along the span

    Hi all, This is probably a silly question, so please bear with me. Regarding the torsional load calculation along the span of a wing; by dividing the wing into several sections/stations, one typically computes the local torsion (at one station) about a spar by the product of lift at that...
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    Composite wing without ribs

    Hi guys, I have two different questions, but didn't wanted to make separate threads. 1) Does anyone know where I can buy an electronic copy of "Moldless Composite Sandwich Aircraft Construction" by Burt Rutan? Is it even available in ebook format? Couldn't find it online. A hard copy from...
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    Landing gear

    Hi all, I'm currently designing a blended wing body UAV, with a target GTOW of around 120kg. I was trying to look for places that have landing gears (nose gear and main gears) for a model of similar weight. I wanted to assess my options because I might go with a composite leg, but currently...
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    Wing Loading Test

    Hi guys, I recently did a wing loading test, whereby I supported the wing tips and then placed the load inside the fuselage to see the deflection. Part of the main spar broke with an applied load of about 20lb. The GTOW of the plane is 5lb. Does this type of test simulate flight loads to...
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    Questions about Wing Loading

    Hi all, I'm currently in the process of designing a small RC plane, and I'm not too experienced in the overall design process. I used Raymer's method for generating a matching plot of Power Loading vs. Wing Loading, and based on that, I chose my design point at a wing loading of 1.25...
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