Pathfinder Control Line Airplane

Pathfinder Control Line Airplane flown by Curtis Williams.
Powered by a Randy Smith OS 40FP and a 11.5X4.5 prop. Ran forever on 3.5oz of fuel. First flights with this new engine. Need to diagnose the surging.
First time this superb plane has flown in many years. Designed by Gordan Delaney.

[@jannovak2234]

profile pathfinder ?

[@jannovak2234]

rc engine with venturi ??

[@jannovak2234]

hi ,,Randy Os max ?? what is engine pleas

[@topbrent]

OS 40FP prepped by Randy Smith of Aero Products. www.aeroproducts.net