Hello Kevin, Jack KM4ZIA and Audrey KM4BUN are watching. What kind of balloon? So far, it seems to have the altitude we've found with latex, but your balloon has the longevity of PET. 73 Tom W4SDR

Hello all, I'd like to invite you to remotely enjoy tracking our HAB tomorrow (May 8th) with a target launch time of 8am EDT. As of now, we're proceeding with the launch though we are very close to

Hi Gang,The Amateur Radio Club at Cornell, W2CXM, in collaboration with the Space Systems Design Studio (SSDS), part of the Sibley School of Mechanical and Aerospace Engineering at Cornell University

I would also like to chime in and say a small battery powered fan would likely increase the distribution of the cold air, even in a cooler there will be a difference in temperature from the top to the

Yes, I've seen similar with cameras that run hot inside the payload box. They have nowhere to dissipate the heat at altitude. The team does have access to nitrogen chilled

Something to remember, While this test using Dry Ice is better than no test at all. It is also very different set of conditions than what is happening at

Hi Michael Another trick you can use is to pre-chill the outer cooler, and ideally run the entire experiment, inside a standard chest freezer. On its coldest setting, that would get the external

Mike, Dennis and I are suggesting better contact of the dry ice with the payload than might have been accomplished. (We don't know because you have not supplied that information) As to the amount

As a research chemist, I used dry ice a lot to cool reactions to low temperatures, -78°C. I would suggest you set your payload in your cooler and then pour dry ice powder over it. Dry ice comes in a

How big is that payload box if it's a snug fit inside the large cooler? How was the CO2 distributed? All just at the bottom of the cooler (not too good), or some against all four vertical surfaces

Hey Gang, Does anyone have much experience in cold-testing payloads with dry ice?   A few students on our team tried to use dry ice for a test, and didn't have much luck.  The objective is to try

Kids today would probably call that a "Yeet!"  hehe Mike / KD2EAT

That's why you have the loop in the line, the tether never even gets close to the support line and if it cuts through the loop Great! Joe WB9SBD On

I've done the string tether in the past. Some of you at a GPSL roughly 10 years ago at this very airport might remember my tethers getting looped around the load line, causing a friction burn. It cut

We've used gloves in the past, but I can't correlate any performance trends with or without. My gut tells me that skin oils take far more than the typical 90 minutes to become a factor. Jewelry is

EXACTLY!!!! Thats our what we call out Hold Back line launch. we have been doing that since the 1980's. We launch is winds like that with 2 people, smooth and

We had one like that once. When we let it go it took off with such a jerk it broke the line under the parachute. So we lost the balloon and the parachute. None of the payloads left the ground. We now

When we were launching, everyone who was close to the balloon wore cotton or latex gloves. That video reminded me of our first launch. SUPER windy day in SE Alberta and not enough fill! Terrible

This is my third ever flight in 1989 with surface winds over 20 knots. You'd think I would learn from this not to launch in high winds, but I didn't

All those bare hands, exposed finger nails, and watches on arms… its amazing it got into the air at all. Great launch! Keith, WA0̷TJT Consider joining: https://groups.io/g/NCM