supercavitation video 2

Second supercavitation experiment, Lake Washington, January 2013.
UPDATE: Hi everyone! Connor here. It's been quite a while since I posted this video, and I haven't been very active in responding to questions. I wanted to say thank you all so much for the support! It's very rewarding to see others sharing in the excitement and passion that I have for this kind of work.
Also, I think I owe everyone a quick update on where I'm at, since it's been a couple years since I posted this video.
The year after I completed these supercavitation experiments, I decided to do another project which did not pertain directly to supercavitation, but dealt with the effects of various surface textures of objects on the drag that they experience underwater. I refined my measurement apparatus, opting for a more precise electronic scale to measure force, updating the arm to accurately control the depth of the probe, and making several other modifications. I won't go into too much detail here, but the results showed that nonconventional surface textures like the dimpling on a golf ball can reduce hydrodynamic drag, but this effect was only observed for a fairly narrow range of speeds which satisfied the Reynolds number range for which this benefit is predicted theoretically. However, I'm excited to do further research into this in the future, as I think that greater improvements may be possible through the more sophisticated use of complex surface textures in specific regions of underwater bodies, as a tool for controlling boundary layer flow.
As for supercavitation, I fully intend to continue my research in this area in the future and I think there is a lot of potential for innovation in the field, however for the past year or so I've been unable to dedicate as much time to research as I would have liked.
Additionally, I'm now studying at the University of Washington in Seattle, where I will major in Mechanical Engineering, and I've joined the Human-Powered-Submarine Team. If you've never heard of a Human-Powered-Sub team, look into it. It's a bit of a quirky engineering competition, but a fun way for me to continue exploring my interest, I'm currently designing the control surfaces for this year's submarine and programming the control algorithm for our variable-pitch propeller. I'll consider posting some videos about the sub at some point in the future.

[@industrialdonut7681]

That's pretty funny I was reading the exact same thing about torpedos which led me to youtube searching for sort of a visual explanation of the very concept of this supercavitation and I saw your first video of this and now this one so I must thank you it's short and to the point I love it!

[@nocknock4832]

simple, great visual

[@DorsetSaferRoads]

this is awesome, its such a massive reduction in drag! like flicking a switch

[@tolga1cool]

This was so ridiculously well done! How can this only have so few views? Thanks foe sharing

[@carmelpule6954]

I am terribly sorry young man to mention this, but for the sake of accuracy in scientific work, what at first may have appeared to you to be a super-cavitation effect, it quickly terminated as an aerated bubble and there was no vacuum to produce the steam or vapour existing in super-cavitation. The atmospheric air pressure was allowed to leak and to go down the hollow behind the supporting vertical rod which acted as the tansom in a high speed boat where water separated from the sides due to momentum.
Because of water pressure at different depth, your experiment clearly show, the air going down after the supporting rod depending on speed. At 00.47 the video clearly shows that the air just entered below the surface but at at 1.01, the momentum of the water on either side of the vertical supporting rod has manged to overcome the water pressure due to depth and the aeration has already reached the bend to the front arrangement. Then all of a sudden when super cavitation commences , the bubble is vented through the back of the vertical rod.
I hope this helps to let you consider my opinion as to what is actually taking place and check it all out with your teachers .

[@damieno224]

Thought same - aeration/ventilation induced behind vertical support, then spreading as speed increases, culminating with ventilation of "cavitator" at 1:32. Glad to see someone else noticed. Nice experiments though! Was interesting to see what looks like 2 individual and aligned 'vent' cones forming.

[@beadowarrior]

I don't know if this is still an interest of yours but you did a fantastic experiment and really clearly made your point. Well done.

[@RogerSchweingruber]

Connor - this is just great... keep digging!

[@kedmark]

Good one, thanks for posting.

[@alejandrosantacruz5379]

Nice work!

[@CosmicEpiphany]

great video!!

[@CaptainJohn]

Awsome please more

[@panben2819]

outstanding!!

[@lostpockets2227]

that was dope marbles

[@joleree1]

That is really badass

[@dinu190389]

Keep doing it buddy....I now understand what supercavitation is :)

[@Hansengineering]

That's intense!

[@jimj2683]

I want to build a SWATH boat that uses supercavitation to go fast

[@43manassinghc-39]

❤❤👍👍👍👍

[@vzgsxr]

I had a super cavitation once, my dentist just filled it and now I'm fine. 🙂

[@georgegreen3672]

a sudden speed slow down

[@chinmaykalkeri]

1:26