[secant0give]

How will the Yak 55 shape up to the Extras?

I guess it will be similar to fly. there are differences between the other two.
The Red white and blue edge 540 Has Quite tapered wings and it will drop one if you give it to much elevator in a tight turn or pull out of a dive to hard. It's not a heavy model by any means and it's lucky that it isn't as I'm sure that this tendency would get worse as the wing loading went up. having said that about it it's not as bad as a lot of models, as far as tip stall goes, but it's gotta be in the back of your mind when flying it. The saving grace of this one is that it has an excellent power to weight ratio. Being heavier it also has inerta it seems to carry it's way a bit after you back the throttle off and takes longer to accelerate when you power up. In knife edge you have to balance the aileron against the rudder a little but not much, It doesn't like having the C of G set far back either, It's a fun machine to fly and it wasn't that expensive as it uses a turnagy motor and ESC, The servo's are a little pricey tho. But other than that it's a pretty cheap and cheerful set up.

The Precision Aerobatics Extra MX is a very light model. It's almost a Kg lighter than the Edge 540 the wings are less tapered and of wider chord so it has quite a lot more wing area, This further reduces the wing loading and it doesn't tip stall at all no matter how you disrespect it. In Knife Edge you just hold rudder and it stays there. It's the nicest plane to fly being just so forgiving, more so than most trainers. The Extra is light it doesn't have much inertia so when you back it off it tends to slow up quickly as long as it's not pointing at the ground that is. When you pour on the sauce it really moves instantly. When it stalls it's sink rate just gets more and it hardly even drops the nose. It has a very healthy power to weight ratio but not as a good as the Edge 540 tho' close to it. The cost of this model was nearly twice as much as the Edge 540 but you do get what you pay for.

The Yak 55 is a fair bit bigger than the other two which are about the same size, it will be heavier so it will have more inertia. I expect it will have a good power to weight ratio, the fuselage is quite round so it will be interesting to see how it goes in knife edge, the wing plan form is about midway between the Edge and the Extra as far as taper goes, I guess the wing loading should be similar to Edge 540 but since it's a bigger plane it should be easier to fly. I'm expecting nothing difficult in the air but it will be different to the other two. It's going to be about the same cost as the Edge 540 perhaps a little more, but it will be a fair cheaper on per Kg basis. I should be able to use two of my 3000 6S packs from the Edge 540 to power it. Just have to see where the C of G will end up to be certain of this

As far as build quality of the 3 Kits is concerned. I'd say the Edge and the Yak are nice light and straight with poor instructions but good hardware. The Extra MX from precision Aerobatics is altogether different. The quality of the build is SENSATIONAL the Instructions are thorough, they truly leave nothing out, and the design and use of materials is something to behold. It's almost a shame to risk it to flight as they are such a work of art. But they way they fly means that you barely give that a second thought. You can buy these with everything including the recommended motor, ESC and servos and it's the way to go but again it's more costly, however there is certainly great value for those extra dollars.