I'm curious, your the only piot I have come across in a year that has admitted to owning the GSP 68"P-51. Here is mine below. Frankly it is the worst plane in my hangar. I totally rebuilt it as soon as i opened the box. Came out at 11lbs with a OS1.08. it is a good flyer but slow. I put way to much work into it. What was yours like?

*Engines in the WM P-51. The books do not recommend a gas engine. However here is what I have seen here. 5 WM 80" P-51s.
2 planes have the OS 160fx. One had a Moki 2.10 the other had a OS BGX 3500? The 160 pulled it okay but nothing impressive. The Moki and BGX flat out pulled the snot out of them. That is what Ive seen here FYI. Later.