I originally intended to use a YS 91 in the WB60. I couldn't figure how to soft mount the engine as the cowl was too short. The only way to do it was to add mounting flanges to the front of the firewall. So I decided to use an OS 90, hard mounted. With this engine I wanted to keep the tank forward as I didn't want to mess with an external pump. After seeing that CA in their Epsilon had a tank support that is twice as wide as the one in the WB60, I decided to make a removable tank floor.

Allan