for the dauntless? or the stuka, for the first, any 90fs upwards, i flew, eons ago, the CAP dauntless, this was a heavy model, with full flap and air retracts, flew very very well on a laser 91, our version is the same size, within an inch, but much much lighter, and the airfoils a lot better, for the stuka, anything from a 90 two stroke, to a 26cc gas