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Are there any regulations regarding the maximum acceleration forces that passengers should experience during takeoff/flight/landing?

Or what would be considered to be an acceptable horizontal acceleration? 0.5g? 1g?

I am contemplating how to achieve very good STOL characteristics for a small commuter aircraft while still maintaining a high wing loading.

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  • $\begingroup$ I really like the question as a passenger plane is long and passengers from different parts of the airplane may experience different accelerations depending on the combination of linear and angular accelerations. $\endgroup$ – Manu H Dec 29 '18 at 22:34
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    $\begingroup$ What sort of scheme were you planning to use that would come anywhere close to this: rocket assisted takeoff? A steam or electromagnet catapult? I suspect you'll be limited by economics more than passenger comfort. $\endgroup$ – Chris Stratton Dec 30 '18 at 0:53
  • $\begingroup$ @ChrisStratton I am not really sure yet. But considering that all these VTOL startups need to achieve a thrust-to-weight ratio >1, a thrust-to-weight ratio around 0.5 and therefore an acceleration around 0.5g might be feasible for a slightly larger aircraft (about a dozen passengers). I don't think rockets or catapults make sense from an economical or operational point of view. $\endgroup$ – Felix L. Dec 30 '18 at 7:17
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    $\begingroup$ Australian document AS 3533.1 prescribes a maximum 2g/3g for amusement ride, so you have some freedom. Note that very high accelerations are acceptable (30g if you wish) but not for any duration. When coughing, the body experiences a 3g acceleration. This is the key: how long will it last? $\endgroup$ – mins Dec 30 '18 at 13:32
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It depends on several factors: 1) How long is the body subjected to these forces? 2) What's the posture of the body? 3) To what extent are the passengers used to g forces (for example due to training)? ...

However, early experiments showed that untrained humans could withstand g forces as much as 20 g for less than 10 seconds, to 10 g for 1 minute, and 6 g for 10 minutes.

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