By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

Factor of safety

All Topics | Latest Posts

Search for:  in Thread Title in  
Simon Chaddock19/08/2010 11:21:43
5685 forum posts
3024 photos
Aircraft are normally designed with a factor of safety of 1.5.
In other word it should survive 1.5 times the maximum designed load which I believe for commercial airliners is 2.5g sustained.
On test the A380 wing apparently failed at 1.45 maximum load so Airbus incorporated a mod weighing just 30kg to satisfy the EASA & FAA.
Given the total weight of the A380 wing this does show the extraordinary level of design detail they have to go to on these big aeroplanes.
I hope they got it right!
Erfolg19/08/2010 12:00:13
11706 forum posts
1309 photos
I do not understand where this thread comes from.
The factor of safety, may be reassuring.
The real challenge is defining the maximum design load, justifying and supporting the contention. After all, not all aircraft have a rating for 6g normal max. operation.
Although there are many examples of commercial aircraft suffering extreme issues and surviving, which I would be surprised were envisaged by the engineers when formulating the design parameters.
Yep, re-assuring.
Martin Harris19/08/2010 12:27:38
9262 forum posts
245 photos
The factor is applied to the design load e.g. +4 -2 would be tested to fail at more than +6 -3  ... the placard speeds are based on these factors to establish maximum manouvering speeds etc. (although to hit 1.5 times design loads only requires exceeding the placarded speed by 1.22 times)
Erfolg19/08/2010 12:35:56
11706 forum posts
1309 photos
What I am hinting at are such issues as sink rate for landing, and many other parameters. Where designers start with a all up weight, with weight allocations and duty requirements, for the sub assemblies. As the design process progresses, there are variance between allocations and anticipated outcome, which need approval, feeding back into the weight and design, load calculations etc. 
Like many things, in principal easy, in practice needs management and control. I guess that is why the design process can be expensive.

Edited By Erfolg on 19/08/2010 12:41:54

All Topics | Latest Posts

Please login to post a reply.

Latest Forum Posts
Support Our Partners
electricwingman 2017
Sussex Model Centre
Advertise With Us
Latest "For Sale" Ads
Has home isolation prompted you to start trad' building?
Q: The effects of Coronavirus

 Yes - for the first time
 Yes - but Ive bashed balsa before
 No - Ive existing projects on the bench
 No - Im strictly an ARTF person

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E!