ORIGINAL: Shogun
I have a DA 50 and for 3D I like a 22 x 8 better than anything else. I've flown 23 x 8 Mej, 24 x 8 Menz and 23 x 8 NX and the engine simply will not rpm in the range where it makes best power for 3D. With these larger props the thrust is huge but the throttle response is lacking and the rpms are below where the DA really shines, over 7K is where the best performance is obtained with the DA 50 IMO. 3D flying is all about quick throttle response and big thrust changes, loose either one of those and your going to get low and regret it.
IME wing rocking is never about a single, simple thing it's always a combination of small things all working against you at the same time.
Yes
Falconwings, [8D] I am going to beat this horse dead I guess... A LOT of the problem is with what is going on with the sticks. That is the honest truth, based on my experience of going from a guy who used to struggle with wingrock to a guy who now struggles to find a plane that "does" wingrock. I understand that this planes rocks and others didnt seem as bad, I know that you feel that there may be something "wrong" with the plane, prop, whatever... and you may be right.
BUT,
I dont want to be argumentative, but you are asking why your plane wingrocks and we are trying to help you figure it out. It only takes about and ounce or 2 of imbalance (depending on the wingspan) for lateral balance related stability to be compromised, it does not take a pound. Especially when you are talking about stall (3D) characteristics. 3D planes need to be setup perfect in every way to really fly well and ARF are the worlds worse for being out of balance.
I do not believe that prop size is going to help/hurt your wingrock problem, unless the ailerons stop way short of the fuselage so that propwash is not getting to them where you have some aileron control in high alpha. Lift in high alpha is not an issue and the intent is to stall the wing and fly strictly on thrust, with only propwash to make the control surfaces functional.
Something else you may try is more elevator deflection. You want the wing to stall, flatout in a harrier or elevator. You get enough elevator throw and the CG right and you elevators will be hands off the rudder and ailerons and throttle. Once those wings stall there is no doubt and they will not rock. But even there, typically as soon as you start to ease in the throttle the wings want to rock as they establish lift, stall, establish lift, stall one wing and then the other.
Want to stop the wingrock?
Practice, check lateral balance, practice, tweek the CG, practice, play with deflection rates, practice, chck expo and make sure there is not too much or too little, practice, try a different prop, practice, practice practice practice. One day you are going to look up and realize that suddenly the wingrock mysteriously went away. You will go back to the other planes that you quit flying and realize that they mysteriously stopped wingrocking too!![8D]