Not quite that simple, Andrew.

While more rpm (air mass flow) + more fuel = more power is basically correct,   there is more to matching prop load and engine than that. 

 I know of an indivdual who was a very smart individual when it came to electronics (converted auto CPUs for aircraft usage), but did not understand the relationship between rpm, prop pitch and thrust.  He tuned his adjustable pitch prop to get maximum rpm - He took off and discovered (sadly too late) that he had very little thrust.  He had sufficient thrust to get airborne but could not fly out  of ground effect - contacted a catus off the end of the runway and died.  Maximum rpm is not the answer.  The answer is maximum thrust (at least for take off).  The key is balance -- if you have too little prop load (too little pitch for example) , you get great rpm - but little thrust.  If you have too much prop load (too much pitch or diameter or chord), you reduce the rpm the engine can obtain, therefore your power and thrust.  So the key is balance. 

I run an older 13B with the 2.85 and an 74x88x5.25 prop - I get 6000-6100 rpm static at WOT.  However, if I take the prop off (no load), my engine will turn 5000 rpm at the idle setting.  So rpm is not the sole criteria.

Ed

From: Andrew Martin