n8_otaa balloon launch from Portugal

[Nuno Monteiro]

Today (26/Ago/2022) at around 11:00am n8_otaa was launched from Aveiro (Portugal).
It is carrying an AT328P (uProcessor), RFM95W (LORA Trasceiver), NEO-6M (GPS), solar cells and super capacitors.
The LORA transceiver is transmitting LORA-WAN packets over 868MHz (OTAA mode), using various Spreading Factors and 125KHz of bandwidth.
It will be picked up by all the LORA-WAN gateways in this area.
Let's see where it ends up.

Tracking: https://tracker.habhub.org/#!mt=roadmap&mz=8&qm=1_day&mc=40.43733,-9.32012&f=eui-70b3d57ed0046b1f&q=!RS_*;

[John Laidler]

Thank you.  What balloon are you using?

John

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[Nuno Monteiro]

https://www.misterius.pt/pt-pt/produto/artigos-festas-aniversario-infantil/baloes-acessorios/baloes-foil-metalizado/balao-foil-redondo-metalizado-46-cm?gclid=CjwKCAjw3qGYBhBSEiwAcnTRLiXthdkHxD_N_xauIJtmg1grgLnzWtn_IK8W8cIr3xBEDXrwooNqnRoCu1EQAvD_BwE

36 inches foil balloon.  For some reason I think the balloon blew up. It fell after 1h30

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[John Laidler]

Thank you.   The foil balloons cannot take a lot of pressure I think.  The amount of free lift will be critical. 

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[Steve]

Interesting ascent rate graph - initial ascent rate over land 2.2m/sec (699m @ 11:31Z to 2755m @ 11:46Z)  dropping to 0.8m/sec over water (2755m @ 11:46Z to 4048m @ 12:14Z) - maybe driven by thermal over land.

How much free lift were you using?

    Steve G8KHW

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[Nuno Monteiro]

I didn't measure the free lift, I just filled it until I felt enough lift. I guess it was too much.

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[Mikael Dagman]

The regular 36" foils , Grabo, Cattex & Qualatex will only take 2 - 2.5 gram of free lift, its critical you fill them to exactly this to have them float.

[Nuno Monteiro]

Correct,  my mistake.  I have another pcb ready,  will give it another shot as soon as the weather conditions get better. 

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