Good morning MG, well its morning for me anyway. I actually have a problem with the whole silly future proof concept as it applies to model airplane propulsion. Its an unworkable concept that almost never works out. First ask yourself the question can you be assured that your second, third, fourth or maybe even your fifth project is going to require a bigger engine? perhaps it wil require even a smaller engine? See where I am going with this? There is no such thing as future proofing in this hobby.

Don,t get me wrong the .65AX is an excellent engine and I do own two examples or I should say just one now. The first was lost in the Colorado River in a failed failed cross country float plane attempt. The second (pictured) powered the successful run. The engine is while a powerhouse is not needed for many airplanes and in fact this whole displacement creep scenario usually does turn any airplane into a less enjoyable aircraft all around.



John