Remember at 4300 feet 60% is like 45% at sea level, you can really tell the difference
True but temp and relative humidity mean just as much as altitude.
Have bin getting schooled on it at the last few races. 93deg and 75 dew point add up to 2500 feet at sea level. There is more to air quality than just how many feet you are up in the mountains. :unsure:
Try racing in the soup here in FL. in the summer.
David
My guess is that the adjusted altitude is about 7500 feet where Glenn runs when the temp goes up and the air really thins out. My starting altitude here is 5200 feet and our adjusted altitude can get to 9000 feet right before the major thunderstorm rolls in to screw everything up. 60%percent nitro helps make up for some of what we lack at this altitude.
If everything ran great before, regardless of nitro content he previously ran, I would start looking for fuel draw issues or bearings. I once broke off the brass tubing in a tank and it acted a little like what your talking about. The other thing to check is the rubber stop on the tank and make sure it is still making a good seal. It's not uncommon to have to lengthen the pipe as the temp warms up in your neck of the woods. As far as suggested props, unless they run at altitude they might not work.
Robert Holland
P.S. I would race in your Florida soup all day over thin air, 90 degree temps, thunderstorms and rain all in 10 minutes. You have never seen a motor lean out any faster than if you race in Colorado. And when it's tuned just right, we are still down at least 10% on horsepower than your worst day.
