Hi Valin,

 

I fly my naturally aspirated IO-550 Legacy out of an airport with a field elevation of 4,400'.  I've seen density altitude as high as 8,000' in the summer.  I've never measured it precisely, but my sense is that my takeoff roll can be up to about 3,000' long if I'm heavy and the density altitude is high.  I don't think I've ever needed more than 4,000' of runway for landing.  I wouldn't worry about operating out of your 9,000' long runway with its field elevation of 5,700'. 

 

My rules of thumb are mimimum 3,000' runway at sea level and at higher altitudes, I like to have 1,000' more runway than field elevation.  I think runway length is controlled by landing distance, not takeoff roll.  Of course, runway slope, winds, density altitude, airplane weight, etc. make each situation different.

 

Best,

Dennis

Legacy, 675 hours