surface piercing?

[pcrussell50]

I've only been into boats for a little more than a year...

back in the 80's as a teenager I recall reading in poular science or something about "surface piercing props" as some kind of new thing. fast forward to present day, and my FIL, who is a pro bass fisher, and his brother and buddies are telling me that when they're up all trimmed up for the long 75mph runs, that you can see the top blades of the prop. so I'm thinking... this must be "surface piercing"? iow are all you guys with fast Allys and 'streams running this way when you're going fast?

Peter
Santa Barbara, ca

[pyro]

this must be "surface piercing"?
...are all you guys with fast Allys and 'streams running this way when you're going fast?


YES. My propshaft is set only 1/2" under the bottom of my hull. A lot of guys run them higher.

[afr]

heres some good info on surface peircing props
now IMO if the prop hub is not centerlined and level with the water is just a trimed out to similate surfacing
i copyied this below an pasted it

But in the case of surface-piercing propellers, there's really no new technology involved at all. Simply the re-arrangement of all the traditional elements of a propulsion system into a different configuration. A few features may be borrowed from the drive- line and hydraulics fields, but these technologies are also as old as the hills. The implication is that we've been wrong - or at least quite a distance away from optimum - for an awful long time. So it is with understandable skepticism that the idea of using surface-piercing propellers on more-or-less conventional small craft is greeted by the boatbuilding community

http://www.well.com/~pk/SPAprofboat.html

[pcrussell50]

lol. here I thought I was asking a total noob question, and it turns out this is a pretty complex topic. and interesting, too.

Peter
Santa Barbara, ca