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Thread: Tailless Aircraft - Reflex and other design issues

  1. #586
    Registered User Himat's Avatar
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    Re: Tailless Aircraft - Reflex and other design issues

    Quote Originally Posted by BJC View Post
    Not exactly. That is a formula for a non-dimensionalized induced drag coefficient, not the induced drag. If you work with actual induced drag, you will see that it depends on span, not aspect ratio.


    BJC

    edit. I’m a big proponent of always carrying / showing units with formulas and calculations. Doing so helps avoid confusing a coefficient with a physical quantity.
    Yes, imprecise of me, I should have said induced drag coefficient.

    Edit:
    Dimensionless numbers are fine when scaling designs, but in the case of the induced drag coefficient I am not sure. The trouble to me is it is not really scaling a design or comparing two similar designs. Used for design it alter the design and mask the change in physics between the designs. The difference in span loading.
    Last edited by Himat; March 10th, 2019 at 10:57 AM.

  2. #587
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    Re: Tailless Aircraft - Reflex and other design issues

    Digging through the intraweb, I found a glider I mentioned much earlier in this thread.

    Click image for larger version. 

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    Click image for larger version. 

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    Short coupled little beast, and marginal in pitch stability. I wonder how I would have reacted to it if I'd had much more experience with short chord wings, as I later had. I might have kinder words to say. But performance wasn't all that impressive, no matter how much my adrenals were squirting at the time.

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