many moons a go a guy was taxi testing a similar setup ---
then he went for take off and the thing just stayed planted on the runway.
So he made a looong full throttle attempt and it still stayed planted -past the point of stop /go further and had exceeded the calculated take off speed! So he shut the engine down and it THEN lifted off - with disasterous results.
I heard this tale years back - don't know if it is folklore or a real event.