Sunday, April 5, 2020

Last week I ran a Drone diesel.  Today I ran an MVVS 10 cc with a 1/2A R/C carb set up for Texaco.  Cloudy and cool, with high temp: 46 degrees.  No problem as diesels like cool weather.  I got this MVVS 10 cc diesel from Bob Slater after his health was failing.  For a couple years after flying in the SWR SAM contest  at Eloy I would spend some days at Bob's house running diesels.  We also flew models on the Indian reservation close to Bob's house.  Much nicer weather in Arizona in January than here in Northern Illinois.  One year it was the MVVS with a 1/2A carb and adapter for the carb made by Mike Salvador for Bob that we ran on Bob's test stand.  We could get very good engines runs with this set up around 20 minutes at the RPM that would fly a Bomber. 

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

Jack Hiner

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