[...]jet channels are spaced within and around said circumference of said disc, each of said channels extending from the top of said disc in a sloping direction away from the vertical to the bottom of said disc, each of said channels being open to exterior of said disc at the top and bottom thereof, said opening at said top being an elongated slot, said opening at said bottom being an elongated slot of greater length than said first-mentioned slot, and said fuel injectors extending in a substantially horizontal direction from said tanks into said channels, a plurality of openings in said injectors to evenly distribute fuel from said tanks into said channels, electromagnetic means to regulate the quantity of fuel flowing from said tanks to said elements.[...]
The big problem with tipjets isn't usually engine design per se, but rather, getting fuel flow to work right and be properly controllable for throttling. The centrifugal effect is horrendous for liquid fuel because of the high fluid density.
You also have the problem of getting fuel from a stationary location up through the hub into the fuel lines in the rotors, without catastrophic leakage.
In general, the disadvantages of a "flat" engine cross section are lossier flow characteristics and increased thermal losses.
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