More on CL-415 Sub-Fins

Ivan Pettigrew writes: "The fellow I talked to this past weekend, Glen Wilson, said that the vertical fins on the stabilizer were only really necessary on one side, because it was only when the critical engine failed (the left one) was it necessary to have them on the starboard side behind the operating engine. If they are on the port stab, it only to make the thing look balanced, but I can't see in the pictures if they are on the left side or not. Glen, who is also a pilot, said that he was not too impressed with things he had heard about the handling of the plane, and he was less impressed with the engineering department of Bombardier who had send them the drawing that were not accurate, and half the instructions in French when they were all supposed to be in English. He had worked on the project in the early stages, but not for the past year or two."

So it seems likely that only the starboard subfin was really necessary, and perhaps the additional area on the starboard side was a similar precaution.