RE: 69" QQ Yak-54
Hi Jorge,
at 2000m the performance will drop considerably. The videos you watched me flying the plane was when the engine was brand new out of the box. I now have about one gallon and half fuel and engine has just come alive the way I like the power. So I would certainly feel that you will not have very marginal power. I'm just worries about the size and the weight of the bigger ones like Saito 1.80. What's the weight difference? My plane the way I wrote the manual came a little on the nose heavy size, bigger engine will certainly not help the situation!
Thank you,
Reza