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Brenner -> RE: 69" QQ Yak-54 (9/1/2007 4:40:36 PM)
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It probably depends on what kind of flying you want to do. 3D & precision flying are both easier with planes that have high power to weight ratios, & low wing loadings.
For instance, If you want to fly maneuvers that have verticals like in the current AMA Masters, or FAI F3D schedules, you are going to need enough power so that the plane doesn't fall off the vertical track, and at the top of a long vertical you have to have enough flying speed to pull, or push over to horizontal with a quarter loop that has the same radius as the quarter loop you flew when you pulled or pushed to the vertical. Also, you have to be able to do this regardless of the speed, or direction of the wind.
Wing loading is very important as well. The heavier the wing loading, the faster you have to keep the plane flying to maintain adequate airflow over the wings, stab, and control surfaces, and the faster your plane has to fly, the less time you have to fly the plane in a precise manner. A heavy plane isn't going to give you the time to line up, or fly, maneuvers precisely. It's also going pick up too much speed on the downlines, and then plow through the air when you pull or push out.
So, if your GMS 1.20 has less power, or weighs more, than the motors that are recommended, you have to be prepared to accept some of these compromises. However, the specs on the Yak 54 are really quite spectacular. If you use the recommended OS 1.20 AX you get a plane that weighs no more than 8.5 lbs, has a wing loading of 20.6 oz/ft^2, and has a motor the is rated at over 3 horsepower. So, if your plane comes out a little heavier, and with a little less power, it's likely that you'll still be very pleased with it's performance, and you'll never know what you're missing.
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