Richard Nye (the builder of the twin Irvine 150 C47) has recently completed a CAP Vulcan, with a pusher prop. He heard that someone was interested in building a Vulcan and wants to make contact. He told me that the CAP model has a design fault, just in case that is the one you end up with, Dave.
I found this thread on the CAP Vulcan.
www.modelflying.co.uk/forums/postings.asp?th=77113
To contact Richard, who has no email, please PM me or reply to this post.
Phil C