Jim:

Harters used ti same magnesium pan for the Student Prince, the Royal Rodent, and the Regal Raider, a kit for a "Proto Speed" plane. There was also a combat design using the same pan, but I don't remember the name they had on that one.

The pan, being used on all four planes, was designed to accept all the 0.29 - 0.35 engines of the time, not specifically the Dooling. My last Regal Raider had a Super Tigre 0.29 in it The plane I showed in the picture has an OS, it also had a Fox 0.40 for a short time, and an OS Max III 0.35. The OS Max I was fastest. And it still runs very well.

Bill.

PS: Two more pictures. wr.