Differences

This shows you the differences between two versions of the page.

--- projects:jimbob:launch3 [2013/07/29 21:52] – created kevwal
+++ projects:jimbob:launch3 [2013/08/07 07:41] (current) – [Predictor] kevwal
@@ Line 1: / Line 1: @@
-=Launch 3=
+====== Launch 3 ======
+This page tracks Launch 3, planning in progress, a foil balloon launch.
+==== Bill of Materials ====
+===== Tracker ====
+Just the one:
+[[projects:jimbob:habtrk|HABTRK]]
+===== Power ====
+Single Energiser Lithium AA or AAA
+  * AA - 3,000 mah, 15g
+  * AAA - 1,250 mah, 8g
+Going to use a single AA for my first flight - the voltage drop from a AAA whilst the GPS is getting a fix is quite high and the boost converter I am using fails to maintain the voltage required to the GPS and it resets after a couple of hours in the freezer.
+===== Balloon ====
+” Qualatex silver “foil” balloon
+Approximate weight of 37g, approximate internal volume of 0.1cu m before envelope stretching.
+This means they can lift payloads of approx. 60g (or slightly more if you allow for stretching). However experimenters typically aim for payloads of the order of 20 - 40g per balloon in order to attempt to make them float.
+  * http://www.randomengineering.co.uk/Random_Aerospace/Balloons.html
+===== Enclosure ====
+ToDo
+===== Helium =====
+Purchased: http://www.ebay.co.uk/itm/Helium-Helium-Cylinder-Helium-Gas-Balloon-Gas-10litre-200bar-/171072782079?pt=LH_DefaultDomain_3&hash=item27d4bb7eff
+===== Weight =====
+Tracker including aerial - 13.8g
+Battery including lead - 16.2
+Insulation ~ 7
+Total = 39g
+===== Predictor ====
+Looking through the data here: http://ukhas.org.uk/projects:microballoons:data?s[]=foil
+and modifying the predictor from here: http://ukhas.org.uk/_media/guides:burst3.xls
+with a balloon weight of 37g, a burst diameter of about 0.70m is the best estimate I could make for a 'if it bursts' flight path with a Descent rate of 5m/s.
+Based on a 39g payload, to get an ascent rate of 1m/s = 3.5g free lift
+===== Flight Document ====
+Flight Document created http://habitat.habhub.org/genpayload/
+Doc ID: c5c392ef5958c9dce8ffd58920297444
+Document: {"type":"flight","approved":false,"name":"G7PMO Launch 2","start":"2013-08-07T00:00:00+01:00","end":"2013-08-07T23:59:59+01:00","launch":{"time":"2013-08-07T10:00:00+01:00","timezone":"Europe/London","location":{"latitude":52.3,"longitude":-0.7}},"metadata":{"location":"Wellingborough, Northamptonshire, UK","project":"G7PMO","group":"Kevin Walton"},"payloads":["e55cc3ffb42062c70087dae3d9520903"]}
+==== Launch Announcement ====
+Launching Wednesday 7th August around 10am a single tracker foil launch, from a site near Wellingborough (Northants).
+Primary tracker: RFM22B based, $$HABTRK, 434.150Mhz (434138400 on my rx), USB, RTTY, 470Hz Shift, ASCII-7, 50 Baud, Parity none, 1 Stop bit
+$$HABTRK, id, time, lat, lon, alt, sats, vinmv, rfm_temp.
+Documentation is here: http://ukhas.org.uk/projects:jimbob:launch3
+Track it here: http://spacenear.us/tracker/ or http://habitat.habhub.org/mobile-tracker/
+Predictor based on Marston launch here: http://predict.habhub.org/hourly/marston/ or anywhere http://habhub.org/predict/ or http://weather.uwyo.edu/polar/balloon_traj.html
+Burst predictors are linked from here: http://ukhas.org.uk/guides:balloon_data