Here is a bathymetric map made with ReefMaster of a rather special place. Two weeks ago we were at Laguna Caliente in the Poas Volcano (Costa Rica). This is an active hyper acidic volcanic lake. We surveyed the lake with a robot boat.



The environment was rather hostile. We needed gasmasks because of the high SO2 concentration. The water temperature was 55 C (131 F) and has a pH of 0.5.
The content of the lake is mostly sulferic acid, hydrogen chloride and some hydrogen fluoride.



A nice overview of the lake. Diameter is about 300 m. The yellow rafters on the lake is sulfur.



Enjoy

Guy

Impressive - your colour palette is appropriate...

Wow! Impressive indeed! Do you have a website where I can follow your project?

Hey thanks, but no website. But I have some videos on YouTube: www.youtube.com/user/gvr63

Guy

Here is a 5 minute video of our work at the Laguna Caliente:



Enjoy

Guy

Thanks for sharing. :thumbup:

Very cool Guy - thanks for posting!

Great post and story Guy.

With pH 0.5 did you have to carry water to rinse the boat off before it touched anything? That acidity is enough to eat through most clothes, bags, etc!

Can I ask... what type/size battery did you use and how long was the survey time?

Regards,
Aaron.

Wow! Very impressive, thanks for sharing.

Hello Aaron

Yes the boat had to be rinsed before transport. Luckily there was a small stream running into the crater where we could do a first rinsing. Later back at the hotel we used tap water to do a beter cleaning. And than quickly to the airport because I had to take my flight back to Europe. The bag smelled awful of sulfur but luckily the customs let me through :-)

I used two 3s 5000 mAh Lipo batteries in parallel. This is good for about a 3 hours run. The survey itself was shorter and took 45 minutes. So no problems there.

Best regards

Guy

PS the crater lake has gone. In April this year the volcano became active again...

Hi again Guy,

Sorry to keep being a pain.... but I'm trying to build something not totally dissimilar, but using a boogie board as the base and starting with heavier 12V SLA batteries. Also looking at twin air props and differential steering.

You mentioned a 350W motor and I see from the video you had it drawing circa 3Amps @ 3km/h... are you able to advise specifically what motor that was or its specs such a diameter, kV, max amp/watt draw, etc?

Thanks,
Aaron

Hello Aaron

Here is a link to the motor I've used:
drones.altigator.com/motor-mk3638-6mm-mi...e1628n07ssr067fmi377

Succes

Guy