deathbydinn wrote:Viper at SF Great America was manufactured in house.
See, here is one of the biggest misconception about "in house" coasters. Many people think it's just the parks own design and maintenance staff, but really what an "in-house" ride means is that a park decided they wanted a ride, probably went out and got bids from many difference "turn key" companies, but couldn't find one that would be a good fit, so they went at it on their own.
In Viper's case, while the ride was certainly "produced" by their in-house (meaning Six Flags corporate engineering team), they did outsource most of the ride components. I know they went to Dennis Starkey and his area of expertise to design and hire the builders for the ride. I'm pretty sure PTC had some involvement with it. The design was a modified version of the Cyclone. And they hired several different construction contractors for the actual construction of the ride.
"In-House" doesn't always mean it's the park staff out there with hammer and nails, it just means that instead of hiring one company, like B&M, Intamin, GCI, etc, to do all the work to bring the completion of a coaster together, the park handles all of that.