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Old 07-31-2012 | 05:56 PM
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From: Hampton, IA
Default RE: chipmuck


ORIGINAL: speedracerntrixie

I still have the question of how much right thrust the airplane has. After watching the vid two things come to mind. I did see a bit of drift to the left on downlines and once saw a large drift to the left on an upline. This still leads me to beleive it has little or no right thrust. The fast landing speed is either high wing loading ( The vid does not support this ) or CG too far forward. Your sone does a great job of flying the airplane BTW. Yes a little right thrust can help, but without knowing how he has it trimmed and what the throttle settings were you won't have any real clue as to the culprit. It could be he has his rudder trimmed incorrectly and is fighting it with aileron trim, or his wing is way out of balance and is fighting it with aileron trim.

I know I'm going to get alot of flack on this but most guys just havent flown a really well trimmed model. If they had, there would not be all this conflict of opinions here. I spend hours getting my aerobatic models to fly as well as I can get them. It makes the airplanes easier to fly and that leads to higher scores. If you are one who on a maiden flight pushes the trims until strait and level flight is accomplished at one speed and call it fine or just live with a bad habit figuring that it's just the way the airplane is you need to pay attention and maybe learn something here that will lead to you spending more time getting the airplane to fly better. I don't think anyone will argue that you can make a plane fly better by spending time trimming and tweakin, however there are traits to every design that will not go away without a redesign. These traits are usually desirable for the type of plane and if you don't like it your best bet is to get a plane that better suits your preferences. IE: a trainer is designed to self right, this means if you trim it for straight and level it will maintain that airspeed and wings level without inputs. If you loose control and let go the higher airspeed will cause the nose to come up and the dihedral will cause the wings to level. Great for a trainer, but not for a stunt plane. Short of major changes you will not eliminate those traits, but it is a trainer, like it or not.
One comment that sticks with me is that this is what a CG Chipmunk does so just learn to use the rudder. To me thats like saying all Car make XXX model XXX pulls to the left on the freeway so just man up and tilt the wheel to the right. We wouldn't accept that answer when it applies to our cars so why would we accept it here? It dumbfounds me that after I explain to people that I have been an R/C pilot for 35 years, have been a sponsored Heli pilot, competed for a spot on a US soaring team, took second place in point standings for the 2006 IMAC southwest region advanced class that when I attempt to help someone trim their airplane to make it easier to fly, it is met with these type of responses. Yes you have a lot of experience setting up your planes to perform to your standards, and you were there the whole time testing and tweaking. Yes again right thrust may help, but to say it is the fix is jumping to a big conclusion. I am also curious if there is right thrust but it is too early to say that that is the problem. I would like to see a sticky with your procedures for determining what is wrong and the correct fixes, including ways to determine when you have reached the point of diminishing returns. this would do more for most pilots than throwing out what you think might be the issue without enough real background.