Valach Motors VM 420 R5-420, 5 cylinder radial four-stroke engine
Masszeichnung Valach Motors VM R5-420 Synpower 2T Aichi A3D1 Val mit Valach VM R5-420 Mega Flugshow Göttingen 2011 Valach Motors VM R5-420 Prüfstandlauf  
Cylinder: 5
Displacement: 420 cc
Output: ca. 25 hp
Bore: 47 mm
Stroke: 48.5 mm
Diameter: 425 mm
Length from engine mount to prop hub: 255 mm
Weight: 11.8 kg
Ignition voltage range: 6 - 9 V
Idle RPM: 800
Max RPM: 4500 

Propeller size:
Fiala Prop 2-Blade:
                    38x24" to


Fiala Prop 3-Blade:
                    36x24" to



1:25 - 1:33

Valvoline SynPower 2T / Aral Ultimate 102 or Shell V-Power 100

All prices in EURO including 19% German VAT. We reserve the right to alter prices and specifications without prior notice. June 1st 2016.


Due to the rather pungent smell of normal grades of petrol and the alcohol content, we recommend to use either Aral Ultimate 102 or Shell V-Power in conjunction with the synthetic two stroke oil Valvoline SynPower 2T.