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Question:
Why do outboard engines use rubber impellers? They constantly wear out, can cause serious overheating problems and can foul up your entire cooling system if they break apart.
I have 2 British Seagull outboard engines, and they don't use a flexible impeller. They use a solid impeller just like you would expect to find in any car or sump pump. So a solid impeller can be used... So WHY do the outboard makers continue to use rubber impellers? (And before anyone says anything about pressure or volume, let me remind you that a 1 1/2 hp sump pump running at 1725 rpm has a head of over 20 feet in a 1 inch discharge. That means it can pump a column of water 20 feet straight up. That's more than enough pressure and flow for any outboard engine).
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless. 
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