What's the engine size in that Skybolt, look larger than the Sig kit but hard to tell in the photo? The full scale Skybolt in that color scheme was built by my dad (N1HW for Hale Wallace). Actually he built two with the same colors; one 180HP built early 70's and with the 260HP 6 cylinder Lycoming in the late 70's.

The 'ole man" was a very active competive modeler in the 60's -70's in scale and pylon, then later SAM RC and FF.