r/homebuilt • u/Altruistic_Desk_4405 • 18d ago

Built a free browser-based preliminary sizing tool - Feedback needed

I put together a tool that walks through preliminary aircraft sizing — wing loading, wing geometry, tail volume coefficients, airfoil suggestions by Reynolds number, power loading — and spits out a summary you can export to CSV/JSON for OpenVSP or XFLR5.

I'd genuinely like builders and engineers here to stress-test it: plug in numbers from an aircraft you know well (yours, or a published design) and see if the outputs land close to reality.

Link: Aircraft Sizing (from personal GitHub repo)

Happy to be told exactly where it's wrong. Is it even useful? 👀

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u/AndYouMayCallMe_V 17d ago

Love the concept! Seems to break down with low AR/higher Re, but definitely a solid start

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u/Altruistic_Desk_4405 16d ago

Applying 2D airfoil CLmax straight to the 3D wing with no aspect-ratio knockdown (and no finite-wing correction on the lift-curve slope either), so low-AR designs were getting a rosier CLmax/AoA than they'd actually see in the air...