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I've come across constraint sizing diagram methods for preliminary but its for general aviation aircraft. Are the general equations used for drawing performance curves valid for unmanned aircraft design which weigh 50-150kg?

enter image description here

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    $\begingroup$ Community, please see Drone/UAV Question FAQ and decide if you would like to answer this or migrate (Upvote this comment for migrate) $\endgroup$
    – Jamiec
    Commented Nov 10, 2022 at 11:57
  • $\begingroup$ What would lead you to believe it might not be applicable? $\endgroup$
    – Jim
    Commented Nov 10, 2022 at 17:04
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    $\begingroup$ Allow me to give an opposing opinion, it could be answered here, the physics are the same. Up to 150 kg? Could be a manned aircraft. No need to migrate this one away I would say. $\endgroup$
    – DeltaLima
    Commented Nov 10, 2022 at 17:39

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That sizing plot can definitely be used also for UAV. Obviously you have to use the relevant requirements: for example, the blue line translating the takeoff length, most probably derives from some FAR or MIL rules which might not be suitable for UAV.

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  • $\begingroup$ Dear downvoter, could you please explain how this answer can be improved? $\endgroup$
    – DeltaLima
    Commented Nov 11, 2022 at 11:25
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    $\begingroup$ Ok, I'll bite. I downvoted this answer as the tooltip says "It is not useful..." in any meaningful way. It's too short, it lacks any detail and most of all, it does not answer the question. The question was "Are the general equations used for drawing performance curves valid for unmanned aircraft design" which was not addressed. TBH, the question was not a good one, and therefore at that point you're much better off seeking improvement from the question asker than writing a substandard answer to a substandard question. $\endgroup$
    – Jamiec
    Commented Nov 14, 2022 at 12:09
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    $\begingroup$ We're after quality questions and answers here, answering substandard questions just fuels the fire of substandard questions. $\endgroup$
    – Jamiec
    Commented Nov 14, 2022 at 12:09
  • $\begingroup$ @Jamiec: ok, thanks for your explanation. In my opinion the question isn't that bad otherwise I (or anyone else) couldn't have answered and it would have been massive downvoted or even closed $\endgroup$
    – sophit
    Commented Nov 14, 2022 at 12:35

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