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    why is it that most all information comes from books written 100 or more years ago !!

    Re: why is it that most all information comes from books written 100 or more years ag I prefer the older books on aerodynamics. The authors seem to have a more intuitive understanding of the subject from so much actual wind tunnel testing. I just received Hoener's Fluid - Dynamic Drag for $65...
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    Could wing dihedral angle have non negligible effect on lift-to-drag ratio?

    it seems to me it would be negligible. Tan of 4 degrees seems reasonable. My experience with dihedral with scale testing RC models is that it has more effect on directional stability than lateral stability. Dihedral really only seems to come into play when the airplane is in a slip or skid...
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    Flying a 2 stroke.. Noob needs some advice..

    You probably watched the webinar allready by Rainbow Aviation on EAA.org. To me it's all about loading, EGT and lubrication. The Rotaxes are very reliable as long as they aren't overheated so have a good pair of egt's and make sure your prop loading is just right. Too low of a prop loading and...
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    Aluminum Ribs, Spars and Skins. Some "General" Rule questions.

    Thanks for the replies. I guess it was Pete Buck of Lockheed Skunkworks that designed the airplane with Monnet. The extrusions are 6061 T6 propriatary T shape. I think I would use stock T extrusions in a design myself. But that's because I wouldn't want the expense of any custom extrusion. If...
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    ?Making sense of Part 23

    Is it required to do a static g loading test of an origional design?
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    CAD to CAM best methods for sheet metal

    I guess I'll stick with rhino then. Good I can spend my money on metal instead :) I think it would be great to get matched hole for the ribs of the Sonex but I guess it's not that big of deal. I was thinking of the RV-12 and another design they reported about in Kitplanes that were matched hole...
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    Making Aluminum Ribs

    I'm using red oak from home depot. It seems expensive but it doesn't really take that much and they will last forever. Excellent resale value. I just think of my Sonex rib form blocks 100 years from now being resold to some homebuilder and the extra $20 is well worth it.
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    CNC plywood plane.

    I have a 12ft x 5ft cnc router and have been using it to make sonex parts. I first thought of a plywood or composite panel airplane as well but after I really analyized it, sheet metal is ideal for a cnc router. Sheets of 6061 T6 .025 cut clean and smooth with pilot holes. I just let it go slow...
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    Aluminum Ribs, Spars and Skins. Some "General" Rule questions.

    Anyone know why Sonex would use a spar cap with this particular cross section? Besides being propriatary and costing $1200 for just thier spar caps? Is there a engineering reason for the bulk of the material to be placed away from the shear web? The spar has a shear web riveted to the spar...
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    CEA-309 Mehari Aerobatic Aircraft

    So do they have plans?
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    Making Aluminum Ribs

    I hope there are some oldtimers here that can answer a question about rib forming. It seems to me that an older way to form the flanges was to cut slots in the metal and then bend the flange over being careful to radius the edge. I just rememeber that's how we did it in A&P school. But now it...
  12. F

    Most homebuilts are WAAAY overbuilt??

    I like your design Monty. Which programs are you using for the FEA and design? Solidworks? I'm just deciding which program to invest my time into solidworks or Pro engineer. Any thoughts for this specific application of homebuilt design from sheetmetal?
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    new use for high speed router

    FYI harbor freight has router speed contollers for $10 if I remember right. I use them on all kids of stuff though even a shop vac when I want to tone it down a little. That would be a good way to control the speed. I think I'll try that router idea, thanks.
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