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  1. mo10

    Your magic numbers ?

    My first metric/requirement is a 4X speed range: max speed = 4 times the stall speed. This requires a very clean and efficient airframe, and eliminates most designs. My second requirement is very easy handling and benign stall behavior. It's not a magic number, but is important to pair with the...
  2. mo10

    EADS E-Fan and other electric/hybrid composite airplanes performance

    What generator engine is Pipistrel planning to use for the Panthera? Has anyone considered using an APU generator in a hybrid? I know that their fuel consumption is poor in general, however, their low weight would make up for that. It seems to me that a hybrid electric with APU (centrifugal...
  3. mo10

    Multi-Element Airfoils Design

    Yes, I missed that part of the request, but I'm not quite sure what amateur use of a multi-element airfoil design program could mean. Perhaps one is just trying to get a ballpark figure for use in X-Plane or in a RC aircraft (although Re-scaling would get you there), otherwise I'm not sure how...
  4. mo10

    Multi-Element Airfoils Design

    Assuming that you want to do 2D design, XFOIL is the obvious choice for single element foils, and it's big brother MSES will do multi-element foils. Unfortunately, it is not free. I've often wanted it, but haven't been willing to pay it's price (I don't know the current cost). Analytical...
  5. mo10

    CFD

    A new aircraft that has caught my attention because of what I believe to be excellent aerodynamic (low drag) design is the Pipistrel Panthera. Panthera Take a look at how they are doing their exhaust, I think it is a very good idea. A ramp like that can be very effective (good angle, location...
  6. mo10

    4 place Canard or RV 10

    I have been on the Cozy email listserv for a number of years, ever since I bought the plans and got a ride with Marc Zeitlin in his Cozy Mk IV. This is a very active and supportive group, and I'd recommend at least searching their archives if not joining for a while to get a feel for them if...
  7. mo10

    CFD

    If you are new to this topic, note that there are a wide range of things that some would label "CFD" including potential flow solutions and Euler solutions, neither of which can capture any viscous effects. Full CFD, if you will, is a solution to the Navier-Stokes equations with an appropriate...
  8. mo10

    solidworks drawings

    I know you are correct, Jay, I've heard the SolidWorks people say the same thing. Just today Insert > Feature > Combine wasn't working so I switched to using a surface to make the cut and it worked great. In short, working with the volume tools (macros) seems quicker, so I haven't learned as...
  9. mo10

    solidworks drawings

    Nice suggestion! I like staying with a solid model in SW as much as I can, versus pure surfaces, perhaps because that is what I am most familiar with. But in the past I've found that operations on lofted surfaces may fail when the equivalent operation on a solid version of the same thing will...
  10. mo10

    solidworks drawings

    I agree, very nice models! I've been working with SolidWorks for years, primarily to create CFD models, but I've never attempted something like this. How do you create the skins on the aircraft, are they pure surfaces or thin-walled solids?
  11. mo10

    Canard Aerodynamics

    Interesting thread, since I tried to derive stability equations for a Rutan-style canard a number of years ago and also found little published to help me. I ended up using a spreadsheet approach as others have already advised. With a couple of macros, one can calculate a number of cases very...
  12. mo10

    Hello from Mass

    Thanks, Doggzilla. I've been here 15 years and like the place, it just has a few too many trees - not enough fields, for RC flying and emergency landings.
  13. mo10

    Hello from Mass

    Hi Everyone, I just stumbled upon HBA a few days ago and was pleasantly surprised by the breadth and depth of the topics and answers. It will take me some time to explore what is here, but so far it looks like a good match for my interests. I am an aerospace engineer by education, but I've...
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