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Aquaglide and Portuguese Man O war

posted Aug 16, 2012, 1:29 AM by Cesar Harada
Protei recently got an article written by Brian Nitz in Green Prophet :

And a few days later, I (cesar) got contacted by the blogpost author Brian Nitz with several awesome references that I would like to share with Protei team :

Description: 1-3 person inflatable sailboat. Converts to windsurfer, kayak and towable. The Multisport™ is a totally unique way to get out on the water! Completely redesigned for 2012, this compact inflatable boat sets up in minutes and converts easily from sailboat to windsurfer, and even makes a great towable for up to two riders. Add the optional Kayak Kit and the Multisport 270 can be used as a stable kayak or small tender. Ideal for learning to sail or simply enjoying a warm summer day. Comfortably fits 1-3 people. Includes a convenient roller transport bag that easily fits in the trunk of a car. Weight ~60lbs.
Specs: 102"L x 64"W x 10"H Rig: 3.1 SqM, 350cm Aluminum Mast

I wish I had this when I was a kid! I kind of did, but that was not one boat does it all, but many different platforms. Looks like a lot of fun. I post it  here, because the format, stability and the fact that it fits into a small bag that you can throw on your shoulders is inspiring. 

And, now an absolutely mind-blowing paper on the hydrodynamics of a Portuguese Man'O War (which is my favorite "animal" by the way) : 

 "Hydrodynamics of sailing of the Portuguese man-of-war Physalia physalis " G. Iosilevskii* and D. Weihs

+Author Affiliations
Faculty of Aerospace Engineering, Technion Haifa 32000, Israel
Author for correspondence (
Physalia physalis, commonly known as the Portuguese man-of-war (PMW), is a peculiar looking colony of specialized polyps. The most conspicuous members of this colony are the gas-filled sail-like float and the long tentacles, budding asymmetrically beneath the float. This study addresses the sailing of the PMW, and, in particular, the hydrodynamics of its trailing tentacles, the interaction between the tentacles and the float and the actual sailing performance. This paper attempts to provide answers for two of the many open questions concerning P. physalis: why does it need a sail? and how does it harness the sail?

Answering his questions I came to references this :

Let's keep this discussion alive :) So interesting leads.