explore the envelope
And herein can lie the hidden dragons.... There is no requirement for amateur built aircraft to have a defined "envelope". So although the term is probably used lightly here, it has serious implications if you start fooling around at the corners of a not defined "envelope".
This is one often overlooked aspect of piloting non certified aircraft. Some have magnificent capability, others rather modest machines simply to leave earth for a bimble, and it can be hard to tell one from the other by looking at them. With a certified aircraft you'll have compromise performance and handling, but the envelope is assured.
Look at the era, I judge the Turbulent to be an aircraft to be modestly built in a person's sitting room, to enable a gentle tour around a welcoming sky. At the time, and for the purpose envisioned, I doubt even mild aerobatics were envisioned as an operational need, and so the added cost to enable such capability was not designed in - and builders are not typically capable of including it at any point.