Today I ran this engine at much higher RPM (4,400 to 4.500) on an 18/12 prop. Stock Aerodyne diesel fuel. With this prop, my heavy 9 pound 7 ounce with Laser on a 1600 sq. in. Airborn takes off at 3,100 and cruises at 2,500 to 2,600rpm. This is due to the high pitch and large diameter of the prop. At 4,400 RPM, with an 18/12 prop, the big MVVS is rock steady. At the RPMs Bob was running in Arizona with this engine, it was a bit tricky to get steady runs. At 4,400 t0 4,500 run times on 28 cc was a bit less than 9 minutes. A full size Bomber or my 1600 Airborn would probably be out of sight in nine minutes with this set up.
It took me some time yesterday in the garage locating the engine and other hardware to run this engine. I could not find the clear plastic tubing extension for the muffler to dump the exhaust out the back of the test stand. Also I could not find the push rod to control the carb with the handle on the test stand. So, I had to make up a new push rod. Looking for these items I did find something lost for years. A brand new MVVS 10 cc with a Davis Diesel head. See 2nd photo. I sent the engine with the head bolts loose per Bob Davis to get him to make the head. Some folks have had a contra piston on the MVVS drop and I wanted this head just in case. The grass is starting to green up as seen in the photo
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