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Burst altitude
Hi Joe - Assuming this is not a trick question (if a balloon is neutrally buoyant it won't ascend - so won't ever burst). Assuming you mean if something else was pulling it up: The 100g Kaymont (KCI-1
Hi Joe - Assuming this is not a trick question (if a balloon is neutrally buoyant it won't ascend - so won't ever burst). Assuming you mean if something else was pulling it up: The 100g Kaymont (KCI-1
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Steve G8KHW / AJ4XE
· #17613
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Helium in a tank?
You can get a good estimate of the purity of a gas by calculating the lift per unit volume. The typical "balloon helium" we get here in the UK is about 95-97% pure (the remaining 3 - 5% assumed to be
You can get a good estimate of the purity of a gas by calculating the lift per unit volume. The typical "balloon helium" we get here in the UK is about 95-97% pure (the remaining 3 - 5% assumed to be
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Steve G8KHW / AJ4XE
· #17554
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K5NOT-11 WSPR Balloon Failure
The latter (rapid ascent and gas release at the desired altitude) . Another idea in the paper is a lift balloon - where the superpressure balloon is filled to just the correct amount on the ground and
The latter (rapid ascent and gas release at the desired altitude) . Another idea in the paper is a lift balloon - where the superpressure balloon is filled to just the correct amount on the ground and
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Steve G8KHW / AJ4XE
· #17549
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K5NOT-11 WSPR Balloon Failure
Looks like that link does not work - search for the paper "Characteristics and Performance of Three Low-Cost Superpressure Balloon (Tetroon) Systems " Steve
Looks like that link does not work - search for the paper "Characteristics and Performance of Three Low-Cost Superpressure Balloon (Tetroon) Systems " Steve
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Steve G8KHW / AJ4XE
· #17544
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K5NOT-11 WSPR Balloon Failure
See the ping-pong valve described here: https://tinyurl.com/y5ukveyb see fig 4 Steve Virus-free. www.avg.com
See the ping-pong valve described here: https://tinyurl.com/y5ukveyb see fig 4 Steve Virus-free. www.avg.com
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Steve G8KHW / AJ4XE
· #17543
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Flight recap from Project: Traveler/NSTAR
Actually that does look more like the problem. Steve Virus-free. www.avg.com
Actually that does look more like the problem. Steve Virus-free. www.avg.com
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Steve G8KHW / AJ4XE
· #17489
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Flight recap from Project: Traveler/NSTAR
Hi Zack - Ive not tried (or even seen) that particular pi camera before but I see its based on the 5Mp OmniVision OV5647 sensor - that was the sensor used by the original pi v1 camera. Raspberry pi re
Hi Zack - Ive not tried (or even seen) that particular pi camera before but I see its based on the 5Mp OmniVision OV5647 sensor - that was the sensor used by the original pi v1 camera. Raspberry pi re
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Steve G8KHW / AJ4XE
· #17487
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Unwinder Design
Hi folks - I'm looking for a home-brew unwinder (AKA dereeler) design - I've got a launch to do with a limited launch area and I really need to use an unwinder. Ive seen the designs for the Vaisala an
Hi folks - I'm looking for a home-brew unwinder (AKA dereeler) design - I've got a launch to do with a limited launch area and I really need to use an unwinder. Ive seen the designs for the Vaisala an
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Steve G8KHW / AJ4XE
· #17409
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KF4ZTI11 latex floater heading across Arkansas tonight
Cross posted from [picoballoon] - given recent UFO interest: https://www.india.com/viral/ufo-or-weather-balloon-mysterious-balloon-like-white-object-spotted-in-japans-sky-twitter-is-bewildered-4062181
Cross posted from [picoballoon] - given recent UFO interest: https://www.india.com/viral/ufo-or-weather-balloon-mysterious-balloon-like-white-object-spotted-in-japans-sky-twitter-is-bewildered-4062181
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Steve G8KHW / AJ4XE
· #17407
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KF4ZTI11 latex floater heading across Arkansas tonight
humm - read "in" as inches missed the almost invisible ' Steve
humm - read "in" as inches missed the almost invisible ' Steve
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Steve G8KHW / AJ4XE
· #17392
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KF4ZTI11 latex floater heading across Arkansas tonight
Its possible but quite unlikely I think - 30in balloons (I assume you are talking about the variety used for floater flights with payloads of a few grams) usually float about 8,000m (25,000ft) - about
Its possible but quite unlikely I think - 30in balloons (I assume you are talking about the variety used for floater flights with payloads of a few grams) usually float about 8,000m (25,000ft) - about
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Steve G8KHW / AJ4XE
· #17389
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Just for comic relief: Pint in Space!
What makes you say that? From the Hydrogen cylinders used (and rolling countryside) I'd say it was shot in the UK by UK company Sent-Into-Space https://www.youtube.com/watch?v=RoIPcV8FwsQ&t=28s Steve
What makes you say that? From the Hydrogen cylinders used (and rolling countryside) I'd say it was shot in the UK by UK company Sent-Into-Space https://www.youtube.com/watch?v=RoIPcV8FwsQ&t=28s Steve
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Steve G8KHW / AJ4XE
· #17339
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ARHAB web page
Wow 797miles (1283Km) is pretty impressive. I assume the great circle distance being referred to is the direct ground distance between the ground stations - rather than adding up the two halves. Do da
Wow 797miles (1283Km) is pretty impressive. I assume the great circle distance being referred to is the direct ground distance between the ground stations - rather than adding up the two halves. Do da
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Steve G8KHW / AJ4XE
· #17193
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KD0VJI11 latex floater over North Dakota Athens AL N4SEV11 floater and PB0AHX1 floater with APRS and RTTY
My guess would be that the pressure drops as the balloon is released because the envelope is under less tension - held to the ground the full lift of the balloon is transferred into envelope tension -
My guess would be that the pressure drops as the balloon is released because the envelope is under less tension - held to the ground the full lift of the balloon is transferred into envelope tension -
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Steve G8KHW / AJ4XE
· #17136
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Need a NEMA log
Here is one I think: https://drive.google.com/file/d/1kPggddrY6XEHVHylGjTU2moUN4Bt7bwz/view?usp=sharing Steve G8KHW/AJ4XE
Here is one I think: https://drive.google.com/file/d/1kPggddrY6XEHVHylGjTU2moUN4Bt7bwz/view?usp=sharing Steve G8KHW/AJ4XE
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Steve G8KHW / AJ4XE
· #17113
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NOMADS GFS file changing June 12th
Thanks Mark - I've just cross posted to the UKHAS group. Steve G8KHW/AJ4XE
Thanks Mark - I've just cross posted to the UKHAS group. Steve G8KHW/AJ4XE
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Steve G8KHW / AJ4XE
· #17026
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Barometric pressure sensor for HABs?
The MS5611 is a better chip to use for HAB - its rated down to 10mbar (approximately 28km). Both the BMP180 and BMP280 have an erratic output value issue outside of their rated range. Steve G8KHW
The MS5611 is a better chip to use for HAB - its rated down to 10mbar (approximately 28km). Both the BMP180 and BMP280 have an erratic output value issue outside of their rated range. Steve G8KHW
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Steve G8KHW / AJ4XE
· #16892
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Recommended Tracking Equipment for a HAB
If your using a Raspberry Pi why not consider the Raspberry Pi Pi-In-The-Sky APRS variant: https://store.uputronics.com/index.php?route=product/product&path=62&product_id=52 Steve G8KHW
If your using a Raspberry Pi why not consider the Raspberry Pi Pi-In-The-Sky APRS variant: https://store.uputronics.com/index.php?route=product/product&path=62&product_id=52 Steve G8KHW
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Steve G8KHW / AJ4XE
· #16821
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[UKHAS] Re: [GPSL] HABHUB iOS app
Cross posting to [UKHAS] Steve G8KHW Virus-free. www.avg.com
Cross posting to [UKHAS] Steve G8KHW Virus-free. www.avg.com
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Steve G8KHW / AJ4XE
· #16625
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Helium Supply
Ive been researching Operation Outward - a UK WW2 operation that launched 100,000 Hydrogen met balloons over a 2.5 year period (trailing wires and dropping incendiary devices on Germany). There were m
Ive been researching Operation Outward - a UK WW2 operation that launched 100,000 Hydrogen met balloons over a 2.5 year period (trailing wires and dropping incendiary devices on Germany). There were m
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Steve G8KHW / AJ4XE
· #16598
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