Head Full of Air » solar balloons

Reed Arts Week, RAW: Geographies

Mathew — Mon, 28 Feb 2011 04:05:41 +0000

I’m proud to be participating in Reed’s Art Week. I’ll be giving a lecture and demonstration of aerospace in the arts and Grassroots Mapping tools on Saturday, March 5 @ Noon. ~~Location is still TBA~~. At the Gray Campus Center room C. There will be complementary supplies and instructions for building your own solar hot air balloon.

Essentially this kit, minus the expensive stuff (wind speed meter, infrared thermometer).

Come for balloons, stay for Francis Alÿs

At 4pm Saturday there will be a showing of Francis Alÿs’s When Faith Moves Mountains, and other works. Of course, you could watch his work on your computer, but get out and enjoy the cinema!
Francis Alÿs, “When Faith Moves Mountains” (2002). from Daily Serving on Vimeo.

Grassroots Mapping PDX: test conclusions

Mathew — Thu, 05 Aug 2010 04:43:27 +0000

With help from my Dad, RJ Steinert, Samantha Mitchell, Robby Kraft, and Molly Danielsson, I’ve been flying balloons most weekends since the workshop in June, gathering lift and flight data on helium and solar hot air balloons.

Solar Balloons:

Regular charcoal sucks, no matter how finely ground. In my tests over this month I couldn’t get it to coat the balloon well. My previous successes were with Char-Kole brand compressed charcoal, ground up. Jeffery Warren copied my building instructions and tried charcoal in Georgia (EU) without success.

I still want to test lamp black, but Cabot pigments STILL hasn’t sent me samples (ordered them the 2nd week in June). Go with iron oxide black (sold as tempura pigment, or from industrial suppliers). Iron oxide black consistently generates roughly 500g of excess lift from a 12-foot tetrahedron. the easiest way to test the lift of a balloon is to tie a water bottle to it and empty out the water until the balloon is airborne.

Use a mattress blower to disperse the pigment when the balloon is mostly full. It pulverizes and disperses, and possibly, through proximity to the motor, charge them a bit.

I stand by my dislike of black HDPE, because it is weak and tears easily when hot.

Helium

My balloons have, until now been all solar, so these were my first helium flights. Helium is great. it rides proudly in the wind, owing to a favorable ratio of static lift to surface area/drag. But helium is expensive. I spent four times as much on helium as I did on all other supplies. After flying my very thin HDPE .3mil balloons and watching the helium leak out over a 3 hour period, I think a more substantial balloon aught to surround such an expensive gas.

I might try some PET film, which retains helium better, but it’s cost ($15 vs $0.50) makes me averse to it.

Or I might switch to hydrogen. I’m excited about this method of urine electrolysis. Apparently it’s far more efficient than water, and I’m already carrying it around!

Robert Rochte is going to launch on Oct 15 UPDATE:POSTPONED

Mathew — Wed, 14 Oct 2009 13:27:14 +0000

Robert Rochte and his class at Grosse Pointe Academy build advanced superpressure polyester solar balloons that are normally cylindrical. he just announced through the Balloon_Sked mailing group that he’s getting ready for another launch.
it will be carrying a KA2QPG HF beacon.

http://arhab.blogspot.com/

UPDATE:

postponed due to weather concerns and potential icing on it’s trans atlantic journey.