You've just been sent back to medieval times

>exchange your services as a tank operator and a man of science/medicine to a king for all the grain booze he can find

I'd let you fuck all the wenches in the kingdom if it meant having modern tech and medicine.

>a man of science/medicine
I'm interested. what can you do in that department?

>armor
Kevlar vest. I'd use it as my main armor and have it integrated with chainmail eventually to cover my arms. Chain+plate for my shins/legs.
>Weapon
An axe of the absolute finest quality. I mean the axes that use the type of metal/blend and wooden handles that make professional lumber-jacks get boners. I want to have this axe bury itself in stone if I were to drop it by accident.

The modern person explaining the basic concepts of sanitation, micro biology, surgery, and anatomy to smart peoples who can piece the gaps together would accelerate medical science like a rocket. Same goes for engineering, metallurgy, physics, you name it.

i parry with my chainsaw like a shield

be more specific pls. say on surgery. would you know how to perform (and treat) a rather simple procedure like a perineotomy which I guess would save a lot of women/children during childbirth?

Or they burn you at the stake for heresy of the highest order for ever daring to think yourself smarter than God.

>No your majesty, really! There are these things called germs that can get you sick!
>Really? Then we must kill ALL GERMS immediately!
>Well no, not all germs are bad my king, just certain ones. Oh and you can't tell the difference because these germs are invisible to the naked eye
>....Burn him!

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>armor
I'm assuming you mean shit like kevlar, probably ceramic plates or something, I'm not dealing with firearms and odds are whatever I do get is going to be worse than a knights but better than the peasant regulars.
>one modern melee weapon
Either e tool or a machete.

you could also just perform Pasteur's experiment and prove everything. bakers and beer brewers would be very interested and should be open to what you ahve to say simply because of their exp.

Or you can just be a secret healer for rich and powerful people, once you save someone important you'll get a reputation and people will start trusting you even if they don't believe you at first