I live about 40 miles north of Pueblo at roughly 6200 ft. What is the altitude you are at now? I've flown my helicopter at this
altitude and at around 800 ft. There is a significant power loss at 6200 ft. They say that it is about 20% loss.

It looks like most of your planes are electric. Am I right? You will not notice the power loss as much with electric. The
air is thinner and you may need to reprop for better flight performance. Taking off will take longer distances and the controls will
not respond as sharply as they did at sea level. If you are using nitro fuels then you can compensate the power loss by increasing
the nitro content.