The TT Pro .46 would be a terrific engine in a Tower Trainer 60 ARF, a Thunder Tiger Tiger Trainer .60 Mk II ARF, a Hobbico Nexstar 46 ARF, a Hobbico Hobbistar 60 ARF, a World Models Worldstar 40F ARF, or a World Models Super Frontier Senior .46 ARF. The shortest wingspan on this list is the 67" WM Worldstar 40F. The WM Super Frontier Senior 46 should look very familiar to folks who have flown the Sig Kadet Senior.

Anyone who says the TT Pro .46 would be underpowered on any of the above trainer ARFs simply hasn't tried it before.

The TT GP-42 is a better match for true .40-size trainer ARFs like the Avistar ARF, the Tiger Trainer .40 MkIII, the Tower Trainer .40 MkII ARF, or the WM Sky Raider Mach I. The GP-42 has gobs of power; 13,500 rpm slightly rich on a 10x6 Master Airscrew Scimitar S2 prop with a Fox RC Long glow plug and Magnum 10% nitro fuel with 70/30 synth/castor lubrication. The more expensive O.S. .46 LA will only turn 12,000 rpms or so with the same prop, fuel, and plug. The light weight of the GP-42 will make 59" to 63" trainer ARFs balance more easily and maintain the gentle slow flying characteristics of the airframe without cutting out power.

Good luck and good shopping!