Hello Jan, thank you for your comments, but only one thing, we fly here at 1800m above sea level (almost 6000 ft) we put an extra power to all our airplanes, i.e. if in a plane manufacturer recomends .35 -.50 engine, we need to go on the .50, with that in mind, do you think I can use the ones you recomend? Thank you.

Andres