MVVS 15 diesel DFSR-RC
This is mounted in Nitro-Planes J-3 cub (sorry pix upload issue) hope to get a flight in this week, it was sitting in the back room, finished not flown yet
There are 2 MVVS 15s mine is the 3022 DFSR-RC (iron piston) and a 3029 GFSR-ABC. this strikes me as odd the ABC max prop stated 8x4 the iron piston 3029 9x5 max size
I took it out to my back porch table it had a 10x5 black MAS.
now for the strange part compression seemed low on flipping but after 10 or 12 off it went best we got was about 8400 my digital fish scale attached to the tail wheel
gave me about 1.5 Lbs thrust. Changed the prop to 9X5 wood 9500-9600 thrust was 1.7Lbs fuel used DAVIS ABC -I do have some Davis 1/2A on the way we will see what we get
on that brew. The wood Zinger may have cost me 500RPM, will have to pick up a MAS. Idle around 3500-3600 . I think by turning in the air bleed screw we will get maybe a lower
idle and we did have a small lag to wide open on the throttle I have to get a small hole in the cowl for an easy access to the screw
hot re starts just a couple of flips, when it was on the 10x5 a rather load harsh exhaust, went away on the 9x5 in both cases black oil out the exhaust its piped to the rear
exits under elevator so plane stays nice and clean. by the 4th run we had to back off compression about a half turn to get rid of the over compression
martin