Since April 2017, the new Valach VM R5-250 radial engine has been flight tested in my Grumman F3-F2 and I flew it at countless airshows. After the end of the season, in October 2017, I took the opportunity to fully use the power of the engine, without any restrictions and without caring about others, claiming that this is too much speed for a full-size F3-F2 or the original could not perform such maneuvers. I made a lot of flights and tested different propellers. This video shows a full flight, unedited from take-off to the landing, with the Fiala 3-blade 32x14" prop.
Sorry about the background noise during landing, there is a freight-train passing half a mile from the airfield.
Technical Data:
Engine: Valach VM R5-250
with fully encapsulated valve train
and electrical fuel pump
Prop: Fiala 32x14" 3-blade
Static RPM: 4.400 1/min
Max. In flight RPM in this actual flight: 5.940 1/min
Fuel: 1:40 Aral Ultimate 102 with Valvoline Synpower 2T
Span: 2,800 mm
Take-off weight: 24,75 kg
Electrical landing gear
Ditex Servos
Jeti ControlBox 200
2x LiIon Batteries 2,600 mAh
13 сен 2024
