Here is a video of a mothership setup for more speed than my mothership. Mine flies very slow compared to this one. Mine flies at around 30mph.
I set up the plane this way on purpose, to slow it down. It has an all up flying weight that is far less than a standard Mothership. This was to slow it down so that it would make a good Aerial Photo platform.
the one in the video below flies at around 50 to 70mph. it was built heavier, with speed in mind.
Project MV8R: V8 in a Toyota MR2