Plausibility Check: DaVincian Technology in the 18th Century?

It's pretty clear that DaVincni's journals could not have been deciphered nor his inventions built practically in his time but how much later could they have been built and used?

A modified and successful version of his flying machine, the automobile, the tank, etc.

Is it possible for these things to come about by the mid-late 18th century resulting in DaVincian technology emerging in use and popularity by the Napoleonic Wars or even the American Revolution?

If so, what are the effects?
 
The problem will be power, many of Da Vinci's inventions only became useful when attached to an electric or petrol engine.

My guess is that they could all be built in the 19th century, but if they where then countries would develop anti-tank/anti-flight guns much sooner.
 
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