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Old 22nd Nov 2009, 09:14
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OATNetjets
 
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Limiting g onset

Hi everyone,

I am looking for some guidelines concerning the limitations that should apply in terms of g-onset for an aircraft that does +8g /-3g...

1°) For positive g's: around me some experienced designers explain they have lost aircraft in the past due to very high g onset (more than 20g/sec). Therefore it was decided to limit it to 10 for our aircraft. Anyone aware of any formal guideline / rule that I could not find myself?

2°) For negative g's: in this case we have not been given any requirement and therefore the design is such that we often go to -25 g/sec. I would tend to limit it proportionnally to the positive g onset limit (let's say around 6 g/sec in our case), or at least not give more than for the positive case, but again there does not seem to be any paper on that subject (not that I am aware of at least).

Thank you in advance for any input, Pierre
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