I am a Super Tigre fan - just so you know up front. A ST2300 is 23cc [X(]. A G26 is obviously a 26cc engine. I'll let you look up the weights of each[8D]. The ST will run on FAI (no nitro) fuel just fine.

So, if the G26 is a near perfect set up, the ST2300 should work just fine. But, to answer your question I have not bolted one to a PICA 1/5 scale WACO. My plans are to run a old (new in box) ST2000 in a PICA 1/5 YMF5 and a ASP180 fourstroke in a 1/5 UPF7 (IKON PLANS)

Good Luck