Ok first of all the the fins on the end design were so short only a well balanced rocket would work.
Hell if it worked I am guessing six to eight feet fins…maybe four rockets if not more…and the timing comes out fairly simple when you think of the timing of this myth.
First the budget:
We are talking what would be considered now an amazing surplus of excess funds to put into this project, they were talking about costs and transportation of the metals, nothing could have been less trivial in the trial. The rich lived rich.
Back to the design…short fins, one combustion point, top heavy when a person was in…could they F it up more?
Solution?or Another try: Longer fins (have to be lighter weight, hitting 6-8 feet minimum I would guess) 3 or 4 points of thrust (not doable huh? try this, you get your hand burned bad but you are free…no fuses) Now the next is hard.
I actually think the bar/wire cage on Grant’s model would help, but that comes down to too much math for me, I am just going by simple fix-it man mechanics. But, the four wire cage should give some stability…kinda wondering if they put some type of plate instead now…not big but maybe 2-3 centimeters that curved the air enough to lessen the pressure.