emteeoh Posted July 4, 2007 Share Posted July 4, 2007 As I understood it, canard planes are usually designed so that the canard stalls at a higher airspeed than the main wing so that the nose will drop before the main wing stalls, making a stall "resistant" plane. The alternative is a canard that is still flying when the main wing stalls, which would aggravate the stall and be hard to recover from... I think. However, I was reading about retractable gear on infinity's website, and saw this in the FAQ: Someone (we'll call "A") relayed a friend's personal belief (we'll call "B") 'that during take off, if the main wing begins to fly before the canard and unloads the main gear, the oleo struts begin to extend, raising the aircraft's aft section and effectively decreasing AOA'. ANSWER: NO! -- if so, someone better warn Beech Craft, AV Tec 400, Jet Cruiser, etc. In reality ("A" figured), 'the nose lifts off before the main wing begins to fly (carrying load off the main gear)'. ANSWER: YES!! -- the canard begins to fly first and the plane rotates. If the wing begins to fly before the canard, then the canard is stalled -- a plane that really does this has some serious canard problems whether the mains are our main retract oleos, fixed main gear oleos, fixed fiberglass hoop main gear, retract fiberglass main gear, or retract fiberglass hoop main gear. "A" reasoned, "I hadn't thought about this before and now wonder if the main wing does start lifting at this time, wouldn't the hoop style fixed gear also stand up creating a negative AOA too?" ANSWER: CORRECT!!! -- logic prevails when one thinks this through :-) ; I don't think this FAQ point is terribly well written, but it seems to say the opposite: that the canard stalls at lower speeds than the main wing, because, during takeoff, the nose lifts off first. Now I'm not so sure what's really going on! What am I misunderstanding/overlooking here? Is it possible that the canard stalls at a different AOA but the same speed? Quote Link to comment Share on other sites More sharing options...
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