Eliacim wrote:
> I also do a brief full throttle check of static RPM to make sure > I have full power for take off. With my C-75, I seek to reach > 2060 RPM, under ideal conditions. My brakes still hold (briefly) > at that RPM. I consider 2000 RPM acceptable (on the low side) > for that full throttle check. For a full power runup to give you an accurate static rpm check, remember that air movement significantly affects the rpm. For repeated accuracy, this should be done with the prop exactly sideways to the wind to minimize wind speed effects. Coupe props are close to the ground. For full power runups with the plane stationary, BE SURE that the ground under your prop is CLEAN. Your prop can pick up small rocks, even through grass, at 1800 rpm. At full power, it can pick up cracked pieces of the pavement. After I got my prop back from the prop shop, I made it a point to do runups on super clean, eyeball checked surfaces and my normal full power runup was at the start of the takeoff roll after I had started moving. A moderate speed throttle advance gets you moving at 5-10 mph before you get to full power and that can keep the picked-up gravel from hitting the prop. Ed
