ORIGINAL: Kiwi
To use it for an intermediate stunt trainer, engines in the 15-25 range are more suitable.
Right on Kiwi!
IMO&E any ½ respectable contemporary Schnuerled TBR
sports timed .15 will put the Flite Streak through its pattern paces adequately if propped appropriately and built light as any model expected to fly well should be. A plain bearing .25LA is the obvious easily sourcable alternative choice. If flying on 60' lines on windier days, upping the nitro content with the .15 will offer that little more pump in the vertical.