After three flights in my RV-7, I am still having issues with the oil temperature. It just keeps climbing slowly. I can only fly for about 15 minutes before it rises to the point where I have to land. We double checked the indicated temps with a infrared temp probe after landing and they match pretty well. We will be checking the vernatherm in boiling water, among other items, but for the third flight we taped some yarn to the cowl to see if the scoop for the cooler was getting enough air.
My question for those familiar with how a Naca scoop works is: does it look like it is working as it should? At lower airspeeds it looks as if the third bit of yarn aft of the front of the opening, underneath it, is being sucked into the vent, at higher speeds only the front two seem to be. The first part of the video is taxi and takeoff and climbout at about 100-110 KIAS, the middle portion is at about 140-145 KIAS (the wheel pants and gear fairings are not on yet), the last part is approach and landing, over the fence at around 70-75 KIAS.
The engine is a brand new Aerosport IO-375 with 9.5-1 pistons, the prop is an MTV-9 3 blade, I have a Christen inverted oil system installed, the oil cooler is a 9 row NDM. The power setting during the cruise portion was 27" MP at 2500 RPM. Lower settings don't help the cooling, until the power is back for descent and landing the temp continues to rise slowly. Cylinder head temps are kept under 400 during climb, at level cruise they are running between 360 and 380.
Not my best landing - of course being the one I put up for public viewing -but, hey, it's only my third in the airplane, and at least it was on the CL!
thanks,
Damon
http://www.youtube.com/watch?v=SSAOjvzXnus
My question for those familiar with how a Naca scoop works is: does it look like it is working as it should? At lower airspeeds it looks as if the third bit of yarn aft of the front of the opening, underneath it, is being sucked into the vent, at higher speeds only the front two seem to be. The first part of the video is taxi and takeoff and climbout at about 100-110 KIAS, the middle portion is at about 140-145 KIAS (the wheel pants and gear fairings are not on yet), the last part is approach and landing, over the fence at around 70-75 KIAS.
The engine is a brand new Aerosport IO-375 with 9.5-1 pistons, the prop is an MTV-9 3 blade, I have a Christen inverted oil system installed, the oil cooler is a 9 row NDM. The power setting during the cruise portion was 27" MP at 2500 RPM. Lower settings don't help the cooling, until the power is back for descent and landing the temp continues to rise slowly. Cylinder head temps are kept under 400 during climb, at level cruise they are running between 360 and 380.
Not my best landing - of course being the one I put up for public viewing -but, hey, it's only my third in the airplane, and at least it was on the CL!
thanks,
Damon
http://www.youtube.com/watch?v=SSAOjvzXnus