I guess it depends what you consider fast. When I first jumped into warbird racing I thought the PM Strega would be a good way to go. I still had a couple Webra Q500 engines on hand. I stripped all the covering off, made a new thinner tail section that actually looked like a p-51, took a bay off the root of each wing and recovered silver with invasion stripes. The Webra was turning a 9X7 rev up pylon prop at 16,800 on the ground. End result, the airplane never saw 100mph. One of the guys I race with has a Kyosho Spitfire with a YS 91 heli engine in it and was hoping to run in our gold class. Can't get enough speed out of it. Ihave been running a Rossi .45 in a Wing manufacturing Macchi that tops out at around 130 with an APC 9X7 but when that engine was put on a WMT34 I was gutting passed by the OS.46 powered airplanes. I couldnt get the airplane fast enough to unload the prop so I didn't get into the power band. For someone set on a Strega who wants to go fast I would look around for a good used YS .91ACor a 110. If you really want speed out of it go with the new 115.