ram jets need supersonic speeds to produce any reasonalble power (Lorin types work sumbsonic, but are very unefficient) and produce zero thrust with no/low speeds. You can surly built cheap ram jets, but I doubt that you could built cheap supersonic drones for controled flight.
Puls jets could also be started from a runway, they produce significant thrust at zero speed.
Puls jets could also be started from a runway, they produce significant thrust at zero speed.
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