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Boat with surface piercing propeller
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Surface piercing propeller like Arneson surface drive. Propeller can be lifted up/down. Prop is ninjago air prop, worth of 30 cents, no big expense. Hull is the new wide hull. It floats, but i had to keep weight low. I'm not sure is it supercavitating, but at least there was water flying all around. Rudders are interesting, since they are made of doors. Boat was filled with PF-stuff, so I was little worried about them.
About this creation








Propeller lifting system, small actuator + M-motor


Ninjago Airjitsu propeller and the connecting pieces


Door-rudders, very little drag






To see how it works in reality:

A video in YOUTUBE here: ->CLICK<-


And a waterjet version using my Waterpump, propably too rear-heavy still.


Building instructions
Download building instructions (LEGO Digital Designer)

Comments

 I made it 
  October 2, 2016
Quoting Jeremy McCreary I've found that for any given motor+prop combo, there's always an optimal final drive ratio, and extensive testing is the only way to be sure you've found it. That alone makes boat-building a lot more time-intensive than most folks realize. The variable prop submersion adds another dimension to your test matrix here. Agree, this hull is great for oddball propulsion systems, but it's load capacity is limited, and the blunt entry and weight distribution encourage waves to come over the bow rather than splitting around it.
You've probably seen the youtube video "Lego Rocket Boat in Slow Motion". I dont know how Sbrick could solve those controlling problems ;)
 I like it 
  September 28, 2016
I've found that for any given motor+prop combo, there's always an optimal final drive ratio, and extensive testing is the only way to be sure you've found it. That alone makes boat-building a lot more time-intensive than most folks realize. The variable prop submersion adds another dimension to your test matrix here. Agree, this hull is great for oddball propulsion systems, but it's load capacity is limited, and the blunt entry and weight distribution encourage waves to come over the bow rather than splitting around it.
 I made it 
  September 24, 2016
Quoting Jeremy McCreary Excellent! This boat deserves way more recognition, but alas, LEGO powerboats stir up little interest on MOCpages. I tried a fully submerged Airjitsu prop once, but the prop load was way too large to get any speed out of it. Turning it into a surface-piercing prop with the remotely adjustable submersion was a stroke of genius -- one that I'll be trying soon! Agree, the PF remote control system is wholly unsuited to boats for many reasons. All of my boats use SBrick remote control now. Q1: Any idea of the boat's top speed at optimal prop submersion? Q2: What's your final drive ratio between the XL drive motor and prop shaft?
Thanks! The speed was limited by the Hull and after all, XL-motor max power. Double XL would be better. On video it was going about max speed. Prop worked about best when it was half in the water. It could go faster with smaller gear-ratio, but i havent tried yet. I was more worried about sinking it. Gear ratio was 1/5,4 and on prop axle there was reduction 8/24 or 12/20, latter was faster. 16/16 could be worth of trying.
 I like it 
  September 23, 2016
Excellent! This boat deserves way more recognition, but alas, LEGO powerboats stir up little interest on MOCpages. I tried a fully submerged Airjitsu prop once, but the prop load was way too large to get any speed out of it. Turning it into a surface-piercing prop with the remotely adjustable submersion was a stroke of genius -- one that I'll be trying soon! Agree, the PF remote control system is wholly unsuited to boats for many reasons. All of my boats use SBrick remote control now. Q1: Any idea of the boat's top speed at optimal prop submersion? Q2: What's your final drive ratio between the XL drive motor and prop shaft?
 
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LEGO models my own creation MOCpages toys shop Boat with surface piercing propellerBoats


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