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  1. GarandOwner

    Any feedback on my flying sailboat?

    :: deleted :: wrong post
  2. GarandOwner

    NASA Crashes a Small plane, On purpose.

    The purpose of this specific test last week was ELT effectiveness and survivability when mounted in different locations
  3. GarandOwner

    Best CAD program for aeronautical drafting?

    If you are looking for 2D only, I would recommend Draftsight. It is from Dassault (makers of Catia and Solidworks) and it is free DraftSight - Dassault Systèmes It is like a free version of AutoCAD
  4. GarandOwner

    Glasair airspeed

    When you say you checked the pitot static system, do you mean installation, calibration, or both? I doubt you have an aero problem if you are seeing a 35 kt difference. I would lean towards a calibration or configuration. Can you give us the details of your calibration flight? Temp Pressure...
  5. GarandOwner

    In pictures: Oshkosh EAA Airventure 2014

    While Sport Aviation (their magazine) has gotten away from the nitty gritty of homebuilding, it is still alive and well at Airventure, and with the EAA. There are alot of chapters that still promote homebuilding, If some of your opinions of Airventure come from only what you have seen covered on...
  6. GarandOwner

    Electric glider tug

    Our preliminary design project at ERAU when I went through the class was to design an electric powered aircraft. To achieve the efficiency to be practical required a design that looked like a powered glider. You can skip the tug and go to a self launching sailplane. The Antares 20E is similar to...
  7. GarandOwner

    calculation of Drag Polar for the Cessna Citation X

    You can find alot of performance data online using Google, What I have always done is taken a scale drawing, imported it to a free 2D cad program like Draftsight, and from there am able to measure any dimension I want. This is also a good tool for making visuals when you put together your final...
  8. GarandOwner

    Trouble with Chris Heintz design book

    kg-force IS a unit that is used in the engineering industry. It is the force one kilogram exerts at standard gravity (long number instead of rounded) The first time I came accross it I had the same question "Why isnt this in Newtons?" My understanding is it was created for real world use instead...
  9. GarandOwner

    CAD Software Recommendations

    If you just need a 2D Cad program to create drawings, I would recommend Draftsight. It is made by Dassault (the company that makes Catia and Solidworks) and it is 100% free. If you are looking for a solid modeling program, then it depends on what you are needing. I would stay away from any...
  10. GarandOwner

    Is there a mximum static margin?

    This is part of the answer but not the only consideration. As stated by a few people above, you can't have a CG so far forward so that the elevator angle required to land exceeds the maximum "up" elevator. The other is control force, as you move the CG forward you increase the stability of the...
  11. GarandOwner

    Which Cub Kit?

    I am trying to decide which kitplane to purchase. I'm looking at one of the "Piper Cub" variants. I know there are quite a few out there. My question is does anyone have any experience with some of these (good, bad or otherwise). I am currently looking at the following: Cub Crafters - Carbon...
  12. GarandOwner

    This is nuts! 150k super cub

    You have to remember the market, being able to carry 1k lbs and take off in a few lengths of the airplane is invaluable in rural areas where you can’t reach by roads. Just because it doesn’t fit your idea of a weekend flyer doesn’t mean that it isnt worth it to bush pilots. Dont like it? Dont buy it
  13. GarandOwner

    Stress analysis question

    Over designing can have adverse affects as well. It is important to note that an ideal spar will be one that when loaded has the same stress throughout. This involves tapering dimensions. There are 2 reasons for this. Number 1 is the obvious one, it reduces weight. The second is not so obvious...
  14. GarandOwner

    in need of a pdf to dwg conversion software

    If you want CAD drawings for giggles and play, use a converter, if you are going to use it for CNC manufacturing, you are better off importing the PDF into your CAD program (may have to convert it to a jpeg first) and then trace the shapes. It may take more time, but you will end up with a much...
  15. GarandOwner

    Corsair/Spitfire hybrid

    How are you going to route your controls? It looks like you might have issues with stick clearance based on your seat/spar location and the location of your stick in the picture
  16. GarandOwner

    Would 3D illustrations on Plans be useful?

    I was taught that every engineering drawing should have an isometric view of the component.
  17. GarandOwner

    Modeling a P-51D created for CNC milling using subdivision modeling

    How did you make the profile of the wing? does it come to a point or is it blunt at the rear? The reason I ask is because if this is CAM model, you need to make sure that no surfaces come to a sharp point. If they do, then the foam will come out jagged. This occurs because if you have any "knife...
  18. GarandOwner

    Vertical stabilizer efficiency

    It is an empirical equation. It is a "force fit" equation that took trend data from many "real world" airplanes and derived an equation that matched the trend line. Alot of "funky" preliminary design equations were created this way. Another that comes to mind that gets screwy if you get too far...
  19. GarandOwner

    Vertical stabilizer efficiency

    This is a term that is generally found through experimentation rather than calculation. There are "trend numbers" which have been listed above. If you want an actual equation, you can derive η_v from DATCOM's estimation of the combined sidewash and tail efficiency equation as follows: S =...
  20. GarandOwner

    How wing works and creates lift ! ...( how about stability ? )

    Actually this is not a good assumption. Static stability does not guarantee dynamic stability nor does it suggest dynamic stability. It has been argued that if an aircraft is dynamically stable, then it must be statically stable. When I was an under grad, my Stab and control professor disproved...
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