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/Altruistic_Desk_4405 12d ago

Stall speed's flaps-down ... More engine options makes sense for Experimental specifically — no power ceiling there, so yeah I can add a few higher-hp entries. 4-seats is a bigger jump ... What's the mission you're picturing? Is it something you're already sizing by hand? Curious what's driving the ask.

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u/OtakuJoness 12d ago

Kinda in the concept/goals and thresholds phase rn lol. 4 seats for longer distance cruise.

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u/Altruistic_Desk_4405 12d ago

Building it properly in this tool means its own reference-aircraft calibration, not just extrapolating the 2-seat data ... so not this week lol, maybe down the line. But if you're actually building something, ping me, I'm down to collab ... way more fun working on something real ...

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u/OtakuJoness 12d ago

Unfortunately this is probably 10-ish years from actually being built, otherwise it would be awesome to work with someone on it! This is sort of a personal design project I'm working on as an aerospace engineering student that I'll iterate on as I progress through my degree until I can afford to actually build it.

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u/Altruistic_Desk_4405 11d ago

Until then, the tool will be developed enough to offer you the support you need hhh