Transit time flow probes (Transonics Systems, Ithaca, N.Y.) were placed on the circumflex artery (3 mm) and on the ascending aorta (20 mm).
The transit time flow probes were connected to a flowmeter (T201, Transonics Systems, Ithaca, N.Y.) via a four channel sequential scanner (TM04, Transonics Systems), except the 20 mm flow probes that were connected directly to a flowmeter (T206, Transonics Systems).
As an alternative, Stack (who had already designed an experimental aircraft for the purpose) lobbied George Lewis to initiate a research airplane project with the goal of investigating transonic flight the transition from subsonic to supersonic speed.
Stack pushed for a jet-powered research vehicle capable of transonic flight.
It agreed to fund a transonic research airplane because it had not pursued much related research on its own, and also because the N.A.C.A.
Not unexpectedly, tempers flared when Williams insisted on the highest standards of data collection, a demand he made so that the transonic phenomena could be understood fully, replicated, and published with confidence.
This configuration enabled it to fly through the transonic range for relatively long flights.