There are 2 versions of the Yak available and also 2 different colour schemes.There's the Yak54 and the Yak 55.The Yak 54 is 1/2" longer and the Yak 55 has a slightly larger wing area 1030sq in vs 1007 sq in.The older Yaks didn't have detachable airfoiled tailplanes.
They are considered 30cc planes so a 26cc engine would be a bit underpowered especially the spe26 and the older CRRC26 which was c***.Flying around with standard aerobatics is alright but all out 3D can be hairy if you don't have reserve power at hand! I have the extra260,edge 540,Yak54 and the 68in sukhoi plus their bigger 50cc planes. These planes perform extemely well with a OS 120AX,OS 160, YS110 or Zenoah G20. I wasn't that impressed with their performance with the spe40.
My spe43 is in my midwestcap232.At close to 14lbs, I'm not expecting much. The vibration levels are pretty high so I'm reluctant to put it in the Yak or Extra 260.