Aerodynamics - Yawing, Slipstream
You might also consider that the fuselage is straight. If it was banana shaped you would get a different result. The actual speed difference between the wings is quite small (yes,I know it's the square of the speed but the square of a small number is also small)
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If you apply rudder and hold it the aircraft yaws (apparent turn), then physically turns, then rolls due to difference in turn radius of inner and outer wing. This state continues as a spiral dive developes.
After that things get a bit more complicated.
If you oppose the roll with sufficient aileron, the aircraft flat turns, as can be used if you landing off the centreline and want to re-establish.
After that things get a bit more complicated.
If you oppose the roll with sufficient aileron, the aircraft flat turns, as can be used if you landing off the centreline and want to re-establish.
yaw-roll coupling.
It isn't. Roll-yaw coupling is something entirely different, but you would need to fly a fighter type aeroplane with a high B/A ratio to see the effects.
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Yes well we could get into inertial cross coupling, but that's not really relevant to the OPs question which is to do with aerodynamic effects. Put your willy away - its the private flying forum after all.
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Yes well we could get into inertial cross coupling, but that's not really relevant to the OPs question which is to do with aerodynamic effects. Put your willy away - its the private flying forum after all.
Perhaps that's their ultimate goal, scare off all weekend fly-boys and close down the Private Flying forum on PPRuNe so that they only need blog with "Sky Gods" of their own calibre; I think I'm not alone to say I've noticed a significant decline in threads / contributions here because of the arrogance of a few......
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Hi, I find it amazing and a bit disconcerting that this question should have to be asked... Have you not done the BASIC TRAINING....
and I don't mean the PPL syllabus, but the real life training which starts at
the age of 10 with paper airplanes, then goes on to Balsa Bashing, with your fingers covered with balsa glue and nicks and cuts from very sharp modelling knives.
When you take your first model glider to the park, you soon realise that DIHEDRAL is required to make it fly in a stable straight line. Also lead weight in the nose will aid its stability. Then if you want it to control the turn, you need to tweak the RUDDER.
Then at the age of maybe twelve, you want a more aerobatic model plane, so you need a flat wing and AILERONS to make it turn, by BANK and YANK.
Only when you are near 16, and maybe in the Air Training Corps, shooting riffles, going camping, and seeing girls in a different light, will you get to be near a full size glider.
All this should come pre-PPL, so you should know the answer to your question, years before sitting in a C152 or PA 38.
and I don't mean the PPL syllabus, but the real life training which starts at
the age of 10 with paper airplanes, then goes on to Balsa Bashing, with your fingers covered with balsa glue and nicks and cuts from very sharp modelling knives.
When you take your first model glider to the park, you soon realise that DIHEDRAL is required to make it fly in a stable straight line. Also lead weight in the nose will aid its stability. Then if you want it to control the turn, you need to tweak the RUDDER.
Then at the age of maybe twelve, you want a more aerobatic model plane, so you need a flat wing and AILERONS to make it turn, by BANK and YANK.
Only when you are near 16, and maybe in the Air Training Corps, shooting riffles, going camping, and seeing girls in a different light, will you get to be near a full size glider.
All this should come pre-PPL, so you should know the answer to your question, years before sitting in a C152 or PA 38.
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I think you guys are needlessly showing some envy there.
lightning mate wrote
then he writes something you've mis interpreted.
yaw - roll coupling is something seen in bigger aircraft. it isnt seen in light aircraft.
I think you guys have misinterpreted what he was saying.
if we were talking about buffeting due to turbulence and someone mentioned mach buffet you would probably find Lightning saying that you were mistaken as well. mach buffet wasnt a part of the buffetting of a light aircraft.
can you see what I'm getting at?
lightning mate wrote
Roll-yaw coupling is something entirely different
yaw - roll coupling is something seen in bigger aircraft. it isnt seen in light aircraft.
I think you guys have misinterpreted what he was saying.
if we were talking about buffeting due to turbulence and someone mentioned mach buffet you would probably find Lightning saying that you were mistaken as well. mach buffet wasnt a part of the buffetting of a light aircraft.
can you see what I'm getting at?
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All this should come pre-PPL, so you should know the answer to your question, years before sitting in a C152 or PA 38.
What really winds me up is that you are practically demanding that we should all know the answer to this question before even starting PPL training. The initial poster posed the question because he does NOT understand and hoped to find enlightenment here, he doesn't need comments like above dumped on him but instead a reasonable answer.
Your post just underscores my previous statement, that this sub forum is rapidly going downhill because of know it all "Sky Gods" belittling those who do their flying as a hobby or are learning to fly......
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When I read the original post referring to the fact that both wings are attached to the a/c therefore how can one travel faster than the other I had the mistaken notion that someone might mention that it is the WING TIPS that move at different speeds not the whole wing. But instead we are now being advised on the subject of Mach buffeting. What a bunch of utter garbage, no wonder this forum is going downhill. Someone asks a question & gets a load of gobbledygook Sky god utter pish from willy waving theoretical plonkers trying to make a mountain out of bugger all.Yes I did the model thing & the ATC but it is mot mandatory, & them what didn't will need help. Stop being so pompous & answer the question.
