Differences

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--- guides:balloon_data [2010/01/14 20:17] – rocketboy
+++ guides:balloon_data [2017/06/08 11:17] (current) – [Helium Cylinder Data] rocketboy
@@ Line 1: / Line 1: @@
 ====== Balloon Data ======
-Totex balloon Data
+Totex balloon Data:
 ^Balloon Weight (gr)^200^300^350^450^500^600^700^800^1000^1200^1500^2000^3000^
@@ Line 18: / Line 19: @@
 Its worth noting that the data above is based on the use of Hydrogen rather than Helium.
+Hwoyee Balloon Data:
+^Balloon Size (g)^100^300^350^500^600^800^1000^1200^1600^2000^
+|Neck Diameter (cm)|≤4.5|≤6.4|≤6.4|≤6.4|≤6.4|≤6.4|≤7.7|≤8.3|≤8.3|≤8.3|
+|Diameter at Burst (cm)|180|380|410|500|580|680|750|850|1050|1100|
+|Average Burst Altitude (m)|16000|19000|21000|27000|28000|30000|32000|33000|36000|38000|
+|Average Ascent Rate (m/min)|200|≥340|≥340|≥340|≥340|≥340|≥340|≥340|≥340|≥340|
 The Balloon **Gross Lift** is the lift generated by the volume of Gas.  Hydrogen has a density of about 0.09 kg/cu m and air about 1.2 kg/cu m at normal atmospheric pressure - generating a lift of a bit over 1.1kg/cu m. Helium has a density of about 0.17Kg/cu m - generating a lift of a bit over 1.0Kg/cu m.   Subtract the **Balloon Weight** plus the **Payload** weight form the **Gross Lift** to give the //free lift//. The **Recommended Free Lift** gives a **Rate of Ascent** of 320m/min (a bit over 1000ft per minute).
@@ Line 23: / Line 32: @@
 Heavier payloads can be carried than the values above - this will either reduce ascent rate, burst altitude (if the balloon is further inflated to compensate) or both. The following spreadsheet allows you to calculate the affect on burst altitude and ascent rates of various levels of fill and payload. To use: choose the balloon size and fill in the payload weight - then adjust the launch diameter until you get the desired ascent rate (normally about 320m/min) -  the volume at launch will tell you how much gas you will need.
-{{guides:burst1a.xls|:guides:burst1a.xls}} by [[ukhas:members#Steve Randall (RocketBoy/G8KHW) - UK| Steve Randall]]
+{{guides:burst3.xls|:guides:burst3.xls}} by [[ukhas:members#Steve Randall (RocketBoy/G8KHW) - UK| Steve Randall]]
-[[http://www.srcf.ucam.org/~cuspaceflight/calc/|Burst1a in PHP]]
-[[http://nearspaceventures.com/cgi-bin/ascent.pl|Online Ascent Calculator]]
+[[http://www.srcf.ucam.org/~cuspaceflight/calc/|CUSF Online calculator]]
+[[http://nearspaceventures.com/cgi-bin/ascent.pl|Online Ascent Calculator (imperial units)]]
-^Balloon size^Payload weight^Helium needed^Free lift^aprox. Burst^ParaChute size
+====== Keep it simple beginners table ======
+^Balloon size^Payload weight^Helium needed^Free lift^aprox. Burst^ParaChute size^
 |300g|150g|0.84 cu m|410g|84,000ft|18"|
 |500g|250g|1.29 cu m|570g|93,000ft|18"|
@@ Line 38: / Line 52: @@
 |1500g|750g|3.21 cu m|1040g|117,000 ft|30"|
+(the above assuming about 1000ft/min ascent rate)
+"Free lift" is the amount of extra lift the balloon will have after lifting itself and the payload - its the thing that sets the ascent rate.  Free lift is the extra weight that should be added (to the payload weight) when filling the balloon to nutral boyancy.  Don't forget to take the extra weight off before launch.
@@ Line 58: / Line 75: @@
 ^Size^Volume (cu m)^Approx Price^ Price /cu m^
-|Small| 0.25 | £20 BOC (Disposable Cannister)| £80 |
+|Small| 0.25 | BOC (Disposable Cannister)| |
-|Large| 0.4 | £30 BOC (Disposable Cannister)| £75 |
+|Large| 0.4 | BOC (Disposable Cannister)| |
-|L 10| 1.81| £65 LBG | £36 |
+|L 10| 1.81| LBG | |
-|PT 10| 1.81 | £80 BOC Inc Delivery and Collection | £44 |
+|PT 10| 1.81 | Air Products £90 via Click4Balloons.co.uk | £49.70 |
-| V | 1.81 | £70 BOC You collect and return| £38 |
+| V | 1.81 | BOC £74.99 via BalloonHeluim.co.uk| £41.43 |
-|N 10| 2.62 | £95 BOC Inc Delivery and Collection / £50 Lets Party Ipswich| £37 / £19 |
+|N 10| 2.61 | £105.00 Air Products via Click4Balloons.co.uk | £40 |
-|L 20| 3.62 | £97 LBG Inc Delivery & Collection | £27 |
+|G 10| 2.61 | £89.99 BOC via BalloonHeluim.co.uk | £34.34 |
-| T | 3.62 | £95 BOC You collect and return / £65 Party Days Cambridge | £26 / £18 |
+|L 20| 3.62 | LBG | |
-|N 20| 5.2 | £115 BOC Inc Delivery and Collection / £85 Lets Party Ipswich| £22 / £16 |
+| T | 3.62 | BOC £105 via BalloonHeluim.co.uk | £29 |
-|N 30| 7.82 | £130 BOC Inc Delivery and Collection / £125 Lets Party Ipswich| £17 / £16|
+|N 20| 5.2 | Air products £130 via Click4Balloons.co.uk | £25 |
-| L | 9.0 | £150 BOC You Collect and return| £17 |
+|G 20| 5.2 | BOC £116.99 via BalloonHeluim.co.uk | £22.50 |
-|L 47| 9.05 | £168 LBG Inc Delivery & Collection | £19 |
+|N 30| 7.82 | £165 Air products via Click4Balloons.co.uk| £21 |
+| L | 9.0 | BOC £165.95 via BalloonHeluim.co.uk (Jumbo) | £18.43 |
+|L 47| 9.05 | LBG | |
+Retail inc. VAT prices displayed on websites as of 08/06/2017 - see rental prices to get the whole picture.
-These are 2008 prices - since then some Helium prices have risen - treat the above as a relative guide only.
+/09/2016:   * A single N20 (5.2cu m) of Air Products Balloonium from Click For Balloons: £115.00inc VAT - includes 3 months rental.
+* A single G20 (5.2 cu m) of BOC Balloon Gas from BalloonsHelium.co.uk: £110.99inc VAT - includes 28 day rental.
+* Both products are quoted as 97% Helium by their manufacturers.
+* A single G20 of BOC Hydrogen via BOC account: £94.18 inc VAT and 28 day rental