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    Would you be interested in some form of back-up propulsion for your piston single? If yes, how much would you be willing to pay for it?

    The second chart isn't showing speeds anywhere near Vx, and yet still shows power levels as low as 40 hp, and at 82 knots! I said the minimum power requirement to hold at altitude at best speed (Vx) in a typical small airplane (C150 in this case) is 25 hp. And the first chart isn't even from...
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    Would you be interested in some form of back-up propulsion for your piston single? If yes, how much would you be willing to pay for it?

    I am a PP and engineer. The Cessna was just given as an example of how surprisingly little HP might be required just to barely maintain altitude at that scale and drag . (I said 25 HP but it may actually be as low as 17 HP when I researched it back when) I never mentioned such a system could...
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    Would you be interested in some form of back-up propulsion for your piston single? If yes, how much would you be willing to pay for it?

    No one is really taking this seriously. A Cessna 150 at the optimum speed can maintain altitude on 25 hp. Now imagine a high strung two stroke 'power pod' than swings up from the empennage, like one of those power modules on a sailplane, with a 2 ft dia. prop. I imagine the whole system could...
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    Pilots with Sonex experience - Talk me out of (or in to) a Sonex

    So the Sonex then has the same airfoil as the original (unmodified) Yankee airfoil, which is known for its bad stall (which is entirely a function of the airfoil) Should I assume the Sonex stalls the same then?
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