Originally Posted by
discountinvestigator
Can somebody remind me what the birdstrike criteria are for the engine of a 737 diameter. One kg and 200 kts strikes me from memory. I will repost the right answer when my bird specialist is awake.
20kg of winglet down the engine may well cause total detachment, in the designed failure manner shown on the photos.
OK, looking at the simulation, I could go with that, as opposed to my blind thought on the underside/engine strike on the 737. Sometimes you forget how big the 145 is. It just feels very small when you get to sit in one for a while at my height!
The impact of the frangible winglet with the wing will easily lead to the winglet of the Legacy being smashed off, no problem. The outer element of the T tail being lost as well, fine. However, when the winglet has smashed its way through the slats, it comes across the main wing box. These are very very strong. Something just feels funny about the winglet doing sufficient damage to destroy enough of the wing to make a difference at this point. Certainly when compared to the fin of the 757 (two tonnes of Seattle's finest) hitting the front of the 154 wing root, it did not do that much damage to the wing box, from memory. Maybe the ironworks from Tupolev win out over the NG wing here.
Now, the loss of the winglet on the NG wing is an interesting proposition. I would have assumed that the change in lift at the wing extremity should be counteractable by normal roll control systems. No doubt Mr Blended Winglets will be busy for the next few days.
At least these aircraft should not have the Gillham code and the FL 350/370 problem.
Also remember that when you see an aircraft 1000 feet below you, it looks as if it is on the same level, such is the deception of the false horizon and the nose up attitudes. At least in some cases.
Does anybody know what the factory acceptance tests are for TCAS. Just wondering if the Legacy had a failed unit of some form or other, and they had never seen another aircraft on the display, because they were not expecting to. So, plug in the bench tests stuff and it looks ok, but is there a practical air test of it? Not necessarily in terms of resolution, but just being aware of other traffic?
You are reaching way too far in your suppositions having to do with engines.
Modern engines don't blow up and detach themselves from wings, they do get thrown off however.
Rather than ask about bird ingestion criteria, just review the history having to do with this model. zilch except for a few broken fanblades and nothing even close to downing a B737 due to collateral damage.
I really don't mind some degree of speculation filling in one gap in knowledge at a time with a what-if. But to string a link of highly speculative what-ifs is reaching.