Hi Eruttan,eruttan said:Mike;
I humbly disagree.
If I sell a plane that can do 150MPH, but has undesirable traits that show at the speed. Not to mention break Sprot Pilot perhaps. I might put a Vne of 100 on it. It test it in this envelope and it is good. It is safe in this envelope. If a pilot goes beyong my tested and published envelope, thats pilot error. It is on the pilots head.
Conversly, If the standard gets into , "well this aircraft can go 150, so you have to test it there", we are beyong the scope of assureing stability and safety. We are forcing people to test where no one would want ANYONE to fly.
If a designer/builder/manufacturer says Vne = X, thats what it is.
Getting into the reasons for it is irrelivant and beyong the scope of the ASTM standard.
As long as flight testing is done for the entire published envelope, then the craft is tested.
I cant see anything other that the Published flight envelope working. But I will listen to the counter point.
Thanks for your reply . I'm not sure we disagree about much here.
I totally agree with your first para. If an LSA mfgr wishes to "limit" his flt envelope for good reasons, it should be so! I feel the standards folks, whoever they might be, should NEVER dictate an aircraft be flown to their perceived limit just because they think it can get there. Tail waggin' the dog. That's nuts. I hope it would never come to that. Common sense to me says it won't - but what does common sense have to do with governing bodies? That's why I think Greg Gremminger's work with ASTM is so important. Jump in here Greg!
I disagree with your statement,
"If a designer/builder/ mfgr says VNE = X, that's what it is. Getting into the reasons for it is irrelevant and beyond the scope of the ASTM standard.
I may be wrong, but I thought the details of the flt envelopes, and hence safety, for all the LSA mfgrs were an important aspect of the standard. VNE, for example might be limited by handling characteristics which several of us are trying to work out in the Forum and ASTM discussions.
IOW, an LSA mfgr might establish a limit, for whatever reason, but it should be verified under defined standards (our standards submitted to ASTM) by flt test before it's put on the market.