RE: 1/2A Diesel Engines?
I posted some extracts from the Aeromodeller review of the MVVS 2.5 cc diesel on the diesel forum. It is a screamer, not a lugger. I don't recall if they tried a 10 inch prop.
Here it is.
There is a review of the MVVS 2.5 in the Aug 1997 Aeromodeller, pgs 38-39. There is an offhand comment that it will turn a 10 x 4 at 10,000, so I would guess it will turn a 10 x 3 at around 11,000. Starting is excellent, used D2000 fuel, choke the venturi and flick. Started on third flick. Goes dead if flooded. (True of diesels in general.) Thats the good news. The bad news is that it is not designed for your application. Peak torque is at 17,000, peak HP at 20,000. Peak HP is 0.56, HP at 11,000 is @0.30. It is a high RPM engine, not a slogger. Even so, I would expect the prop to unload more in the air and maybe make the engine happier. Just have to try it and see if you can get it to go consistant enough for your needs. A review of the ST G20-15 diesel says 10,300 with at topflite 10 x 3.5 nylon prop. So we may be low on the RPM figures for the MVVS with a 10 x 3.