(Replying to PARENT post)
Think about Spanish and Portuguese caravels, english longbows, etc.
If your country somehow discovers something akin to electricity, probably fastly reproducible by other nations, you will probably want some extra time developing technology over the discovery, just to have maybe, 10-30 years edge over the rest. The more, the better.
This is not any news, US has done it already with the stealth technology (and they still have and edge on it, even if they're not making it public), nuclear technology (most of it are still closely guarded secrets, think hydrogen bombs), even most of the optical technologies related to satellites are highly guarded secrets.
(Replying to PARENT post)
(Replying to PARENT post)
Assuming it doesn't require huge energies like 1MW/lb. If it did, it would be incredible for space travel, but fairly useless and incredibly inefficient for anyones every day life.
(Replying to PARENT post)