Guest
ian redshaw flew the avro 504 in the video ,the builder and owner andy johnston kindly gave me these details - Engine details: ¼ scale 9 cylinder four stroke 33mm bore, cast iron liners of 1mm wall thickness and aluminium finned barrels 45mm stroke 347cc, compression ratio 5.6:1 Super unleaded petrol with belts’n’braces 50:1 oil mix. (I use Bel-Ray HR1 fully synthetic ester 2-stroke racing oil.) Total loss force fed oil system via engine driven oil pump, approx. 30cc per 10 min flig
