propeller horsepower

20 LETTERS · STARTS WITH P

propeller horsepower is a valid 20-letter word worth 31 points in Scrabble and 35 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
P3R1O1P3E1L1L1E1R1H4O1R1S1E1P3O1W4E1R1
3 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 0 + 4 + 1 + 1 + 1 + 1 + 3 + 1 + 4 + 1 + 1 =31 PTS
DOUBLE WORD → 62TRIPLE WORD → 93
MEANING

What does propeller horsepower mean?

1