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#1
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Keys to flying in ground effect:
Keys to flying in ground effect:
-want sensitive control so can react quickly to "squirelyness" -large stabilizer (perhaps a stabilator) and longish tail boom -optimized control surfaces for good control at low speed -best to fly only in low wind -long tow rope to avoid turbulence of or crashing into boat -anything missing? Brock |
#2
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Keys to flying in ground effect:
"durabol" wrote in message ... Keys to flying in ground effect: -want sensitive control so can react quickly to "squirelyness" ....which will quickly lead to a PIO, given an inexperienced pilot. I don't know exactly what you are planning, but go to a gliderport and get some aero tow experience before you go any further. -anything missing? I don't know exactly what you are planning, but I earnestly suggest that you go to a gliderport and get some aero tow experience before you go any further. http://www.ssa.org/sport/wheretofly.asp Vaughn |
#3
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Keys to flying in ground effect:
"vaughn" wrote in message ... "durabol" wrote in message ... Keys to flying in ground effect: -want sensitive control so can react quickly to "squirelyness" ...which will quickly lead to a PIO, given an inexperienced pilot. I don't know exactly what you are planning, but go to a gliderport and get some aero tow experience before you go any further. -anything missing? I don't know exactly what you are planning, but I earnestly suggest that you go to a gliderport and get some aero tow experience before you go any further. http://www.ssa.org/sport/wheretofly.asp Vaughn I totally agree with Vaughns. Sensitive controls with quick reaction is very likely to lead to over-reaction. In the initial part of a glider aero tow, when the glider is airborne and the tow plane isn't, you will rapidly learn what is like to fly in ground effect. As a side note: You may even find flying gliders fun!! Wayne http://www.soaridaho.com/ |
#4
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Keys to flying in ground effect:
On Nov 25, 6:19*am, "vaughn"
wrote: "durabol" wrote in message ... Keys to flying in ground effect: -want sensitive control so can react quickly to "squirelyness" ...which will quickly lead to a PIO, given an inexperienced pilot. *I don't know exactly what you are planning, but go to a gliderport and get some aero tow experience before you go any further. -anything missing? I don't know exactly what you are planning, but I earnestly suggest that you go to a gliderport and get some aero tow experience before you go any further.http://www.ssa.org/sport/wheretofly.asp Vaughn I strongly agree with Vaughn - learn aero tow first. It's not trivial. If possible, fly a Grob 103 in ground effect. It has an interesting behavior that illustrates some of the issues. Mainly, the center of lift moves forward in ground effect reducing pitch stability and making the elevator about twice as sensitive as it is out of ground effect. Most existing G103's have been damaged at least once due to PIO's in ground effect - although some of this is due to a peculiar wheel bounce effect. |
#5
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Keys to flying in ground effect:
durabol wrote:
Keys to flying in ground effect: -want sensitive control so can react quickly to "squirelyness" -large stabilizer (perhaps a stabilator) and longish tail boom -optimized control surfaces for good control at low speed -best to fly only in low wind -long tow rope to avoid turbulence of or crashing into boat -anything missing? Brock We all start learning somewhere... So yes, there is quite a bit missing. First and foremost - learn how to do center of gravity calculations and how to find the center of pressure (Lift) of your wing and tail surfaces. Then, learn about the relationship between CG and the center of lift and how that relationship determines stability. A forward CG will give you that "squirleyness". Correcting the CG/CP relationship will correct it. A large tail area and long tail arm won't fix instability. Flying in low wind for sure, but which way??? Which way do the birds fly? The tow rope could be an interesting problem that could actually be dangerous. Two parts - 1) where the rope attaches to the aircraft? Will that impart a pitch moment? 2) Jerk. (4th derivative of motion) What happens when the rope suddenly goes taught? What about if that happens in flight? |
#6
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Keys to flying in ground effect:
*A forward CG will give you that "squirleyness". *Correcting the CG/CP relationship will correct it.
You mean "a forward CP", so the distance between CG and CP will be shorter!? A large tail area and long tail arm won't fix instability. That's contrary to what I learned, so please explain further. Oliver |
#7
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Keys to flying in ground effect:
Oliver Arend wrote:
A forward CG will give you that "squirleyness". Correcting the CG/CP relationship will correct it. You mean "a forward CP", so the distance between CG and CP will be shorter!? A large tail area and long tail arm won't fix instability. That's contrary to what I learned, so please explain further. Oliver Increased 'tail volume' as it's sometimes called, can promote dutch roll.... Brian W |
#8
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Keys to flying in ground effect:
Oliver Arend wrote:
A forward CG will give you that "squirleyness". Correcting the CG/CP relationship will correct it. You mean "a forward CP", so the distance between CG and CP will be shorter!? Sorry, you are right. That would be an an AFT CG problem. CG is ahead of CP by some distance, and a download on the tail holds the nose up. A large tail area and long tail arm won't fix instability. That's contrary to what I learned, so please explain further. Oliver Stability is a CG/CP issue. |
#9
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Keys to flying in ground effect:
"durabol" wrote in message ... Keys to flying in ground effect: -want sensitive control so can react quickly to "squirelyness" -large stabilizer (perhaps a stabilator) and longish tail boom -optimized control surfaces for good control at low speed -best to fly only in low wind -long tow rope to avoid turbulence of or crashing into boat -anything missing? Brock Some reading for you- http://www.angelfire.com/on/dragonfl...teroflift.html There are what appears to be some typos in it and he also states that the stall (of the wing) is because of low airspeed. Hmm! I was taught that it was caused by too much angle of attack. But, some good info in this page in my opinion. -- We have met the enemy and he is us-- Pogo Anyolmouse |
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