'Propulsively' - a word? Why/Why not?

Yeah, it seems it's not a word... how curious, lol.
But I can imagine engineers, physicists, mathematicians, technicians, nerds and geeks using that word if necessary. I know those kinds of people have no problems making up new words to say what they want, as long as they make sense theoretically.

 So, I spoke to an english professor last night and I was told...

 A verb can not be described as 'propulsive', therefore it is not an adverb.  "The bat propulsively affected the ball" is incorrect.  However, "The effect of the bat was propulsive" is correct.  When you say "Propulsively affected" you are actually trying to describe the EFFECT of the verb and not the verb itself.  The act itself of 'affecting' the ball is not propulsive - the effect of said 'affecting' is propulsive, which means you're describing a NOUN not a verb and an adjective needs to be used, not an adverb.

 Further, he says, "propulsive can't describe any verb nor any adjective accept itself.  No action can be propulsively anything except...propulsive."

 I found that to be a very interesting explanation and thought I'd share.

That's understood.  You can use it if you want.  I'm asking about it in the context of grammar and it is grammatically incorrect.   I'm sure you could do a google search and find tons of books where highly educated native speaking experts end their sentences with prepositions.  How many books contain a sentence like . . "that's what she needed to go to the store for."?  Countless.  It's fine.  You can say it.  But that sentence is not grammatically correct.  It sounds fine.  People say and type it all the time.  But, it is absolutely not grammatically correct.

I'm not arguing with you.  I just think you are misunderstanding the context of the question.  'Propulsively' as an adverb is not grammatically correct.

Anonymous

People say and type it all the time.  But, it is absolutely not grammatically correct.

What people say all the time is automatically and by definition part of a certain variety and register of English, and it's grammatical according to the grammar of that kind of English. Since preposition at the end are absolutely common and natural in every variety and register of English, they are always grammatical and no one can say or prove it's wrong to do so for any reason. A different example is "It don't matter". It's not part of every variety and register, so you can say it's not grammatical if used in certain contexts, but it is nevertheless grammatical in other varieties and registers of English.
That said, "propulsively" is a technical word, used mainly by people who study or work in a technical field, so it's difficult to know how good it is, unless you are one of those people. What I can say is that those people have no problems using words that don't exist, as long as the terms sound reasonably good and make sense. I would use it, "propulsively", it doesn't sound bad and it makes sense... Marius found that word in books that seems to come from lots of American engineering associations, so... I'd say it's actually in use.
Just my opinion.