In case you were unaware

"HammerheadFistpunch" (hammerheadfistpunch) 10/17/2017 at 16:20 • Filed to: None

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Surface piercing drives are the coolest/scariest things on the water

Yowen - not necessarily not spaghetti and meatballs > HammerheadFistpunch 10/17/2017 at 16:21

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Never heard of this and I’ve heard of boats before, in fact I’ve been on them, but this? It looks like magic and sorcery to me.

HammerheadFistpunch > Yowen - not necessarily not spaghetti and meatballs 10/17/2017 at 16:23

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pretty much. Same concept as the one bladed fan being the most efficient air mover, the rest of the blades are for balance and just add drag. Only the bottom, say, 90 degrees of the props are submerged and pushing water, the rest are free to spin in the air reducing drag, plus there are no skegs in the water causing drag. They are water mincers of deaths.

Yowen - not necessarily not spaghetti and meatballs > HammerheadFistpunch 10/17/2017 at 16:26

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So I assume this would require calm water to be most effective? How would it do in 2-3ft chop/waves?

Daily Drives a Dragon - One Last Lap > HammerheadFistpunch 10/17/2017 at 16:28

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I get why this would be a beneficial setup but my god that’s terrifying.

HammerheadFistpunch > Yowen - not necessarily not spaghetti and meatballs 10/17/2017 at 16:30

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they can be pitched down, but the occasional cavitation aint no thang for these blades, they will just bite next chance they get.

HammerheadFistpunch > Daily Drives a Dragon - One Last Lap 10/17/2017 at 16:31

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Im a little surprised it hasn’t been used as a villain death plot device yet.

HammerheadFistpunch > Daily Drives a Dragon - One Last Lap 10/17/2017 at 16:39

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images will not quell your uneasiness

chop chop

Demon-Xanth knows how to operate a street. > HammerheadFistpunch 10/17/2017 at 16:41

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I never knew this was a thing. Quite interesting. Usually this isn’t considered a beneficial situation. Kinda like doing a never ending burnout in the sand with paddle tires I guess.

HammerheadFistpunch > Demon-Xanth knows how to operate a street. 10/17/2017 at 16:44

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if you want prop efficiency at high speeds, surface drives are the biz. You can swing a huge prop REALLY fast and still get decent efficiency. The strange stuff is when you see it on big ships like this

or this

Demon-Xanth knows how to operate a street. > HammerheadFistpunch 10/17/2017 at 16:46

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When I become a super villain, I’m totally getting that top boat.

cmill189 - sans Volvo > HammerheadFistpunch 10/17/2017 at 16:48

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So you’re saying this wouldn’t make for a good ski boat?

HammerheadFistpunch > Demon-Xanth knows how to operate a street. 10/17/2017 at 16:48

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Nothing says villain like “powered by 4 huge brass mincers”

benjrblant > HammerheadFistpunch 10/17/2017 at 16:53

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I’ve never heard of this. More or less efficient than a jet?

MonkeePuzzle > HammerheadFistpunch 10/17/2017 at 17:00

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I’d have thought some sort of cavitation created by the blades entering the water would negate the advantages of less resistance of the out of water portion

but... I MIGHT not be a scientist

HammerheadFistpunch > MonkeePuzzle 10/17/2017 at 17:05

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well plus remember they are at the transom which should be the part of any boat still in contact with the water at any given moment, so there is a good chance the stay in the water a lot.

Daily Drives a Dragon - One Last Lap > HammerheadFistpunch 10/17/2017 at 17:32

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Right. Like this would make for a perfect James Bond bad guy gets rid of someone who crosses him machine.

jimz > HammerheadFistpunch 10/17/2017 at 17:41

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That pic looks familiar...

HammerheadFistpunch > jimz 10/17/2017 at 17:48

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Your know these guys?

jimz > HammerheadFistpunch 10/17/2017 at 17:49

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No I used it like a month or so ago in one of my hydroplane posts. It’s probably one of the clearest pictures of how surface drive props work one can find.

HammerheadFistpunch > benjrblant 10/17/2017 at 18:02

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Jets are actually super inefficient, they just can run fast. These are way more efficient than jets.

benjrblant > HammerheadFistpunch 10/17/2017 at 18:06

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The more you know.

ITA97, now with more Jag @ opposite-lock.com > HammerheadFistpunch 10/17/2017 at 18:34

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0/10, needed 1000 foot long water ski rope. Skier died on impact.

But seriously, that is a cool video. I’ve never seen them actually in motion before.

awmaster10 > HammerheadFistpunch 10/17/2017 at 19:22

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I love this video and surface drives. Over in southeast asia they run some pretty cool makeshift longtail motors on little skinny boats that FLY.

BaconSandwich is tasty. > HammerheadFistpunch 10/18/2017 at 00:02

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I can only imagine this combined with a hydrofoil.

Demon-Xanth knows how to operate a street. > HammerheadFistpunch 10/18/2017 at 10:18

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With platforms RIGHT ABOVE THEM! And a back door at the waterline!