highaltitude.log.20070329

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[22:01] <LaurenceB> Hi all
[22:04] <LaurenceB> Rocketboy, got your email
[22:04] <rocketboy> ok
[22:04] <LaurenceB> do you have any helium?
[22:04] <rocketboy> no - but I can get some locally
[22:05] <LaurenceB> I'll pay the cost when we meet
[22:05] <rocketboy> sure - how much do you need?
[22:05] <LaurenceB> Will have to look at transport and weather for sunday
[22:05] <LaurenceB> well the payload is around 300 grams
[22:06] <LaurenceB> whats the smallest balloon you've got?
[22:06] <rocketboy> hang on I'll do some calcs
[22:07] <LaurenceB> we could try a payload above the glider if you've got anything to launch
[22:07] <rocketboy> what balloons will you want to use
[22:08] <LaurenceB> lightest one youve got
[22:08] <LaurenceB> only has to get to 4km
[22:11] <LaurenceB> Did some tests today, the pitch stability problem seems to have been solved
[22:13] <LaurenceB> but looks like the trim is out, it stabilised heading about 90 degrees off target, I'll increase the size of the rudder
[22:13] <rocketboy> I'll have to look into the balloon - I have some KCI1000s - but they are way to big for what you want - but I may have another solution
[22:13] <LaurenceB> well its the expense thats all
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[22:16] <rocketboy> Will need about 1.5cu m of helium
[22:17] <LaurenceB> not too bad
[22:18] <LaurenceB> hang on thats a lot of lift
[22:18] <rocketboy> well I was assuming a 500g baloon and a 320m/min ascent rate
[22:19] <LaurenceB> that'll be nice and fast :-)
[22:21] <rocketboy> yeah - helium, 500g balloon, 300g payload + 320m/min = 1.436c um
[22:22] <LaurenceB> know any good wind forecast sites?
[22:25] <rocketboy> ground wind - bbc?
[22:26] <rocketboy> weatherunderground 850mb?
[22:27] <LaurenceB> looking...
[22:29] <LaurenceB> how do you work out the wind speed?
[22:31] <rocketboy> colour
[22:32] <LaurenceB> I see, what are the units on the key
[22:32] <rocketboy> m/sec
[22:33] <rocketboy> (not sure what there are negative values)
[22:33] <rocketboy> the 700mb is useful too (about 3000m)
[22:34] <rocketboy> the 850mb is about 1500m
[22:34] <LaurenceB> http://www.wunderground.com/modelmaps/maps.asp?model=GFS&domain=EU
[22:34] <LaurenceB> that map?
[22:34] <rocketboy> ah - http://www.wunderground.com/modelmaps/maps.asp?model=GFS&domain=EU
[22:35] <rocketboy> then select 850/700mb map and add
[22:35] <rocketboy> then animate
[22:37] <LaurenceB> hmm if thats in m/s its very slow
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[22:38] <LaurenceB> it says its accumulated precipitation
[22:38] <rocketboy> K?
[22:39] <LaurenceB> at the bottom in yellow box
[22:40] <rocketboy> select model = GFS, level = 850mb, domain = europe. then "add a map"
[22:41] <LaurenceB> aha
[22:41] <rocketboy> click on "remove" the GFS SURPRE line
[22:41] <rocketboy> then click animate on the line you added
[22:43] <LaurenceB> color is temperature
[22:46] <LaurenceB> the train are a bit bad on sunday, cant get to cambridge till 1.15pm
[22:46] <rocketboy> OK - not too much of a problem if it all goes OK
[22:47] <rocketboy> Not sure about the maps on the 200mb colour is windspeed
[22:47] <LaurenceB> well need a while to set up and get the balance right, check radio ect
[22:49] <LaurenceB> it doesnt get properly dark till 8pm
[22:49] <rocketboy> yep
[22:49] <LaurenceB> so we can launch at any time up to 5pm I'd say
[22:49] <LaurenceB> flight should last 45 minutes
[22:50] <LaurenceB> depending on the wind speed I'll set the traget some point downwind
[22:51] <LaurenceB> not sure how well it will work, I think it will glide, but beyond that we'll see
[22:52] <LaurenceB> Think with a rather ugly hack of a glider and gps along at 1hz its always going to be a bit unreliable
[22:55] <LaurenceB> After this I'm going to have to work on my exams, but after the end of next term I'm already thinking about getting an artf glider with thermopiles
[23:00] <LaurenceB> rocketboy do you know if Henry is in Cambridge?
[23:06] <rocketboy> no idea he left for the west country a few days ago
[23:07] <LaurenceB> I'm sending out an email to the mailing list to let people know
[23:08] <LaurenceB> so there will be an EARS event at the same time?
[23:08] <rocketboy> yep
[23:08] <LaurenceB> okay I'll say that, should be fun :-)
[23:09] <LaurenceB> have you got any rockets?
[23:10] <rocketboy> yep - I may launch one sunday if there is time
[23:10] <LaurenceB> what time does the EARS meeting start up?
[23:11] <rocketboy> normally about 10am
[23:11] <LaurenceB> okay sent the email out
[23:13] <LaurenceB> have you considered launching a rockoon?
[23:14] <rocketboy> yeah - for about the last 5 years
[23:14] <LaurenceB> I was thinking about gyroscopically stabilising it
[23:15] <LaurenceB> it you had a solid motor you could spin the motor
[23:15] <LaurenceB> yet keep the main body stable for photos ect
[23:16] <rocketboy> well its all possible - the electronics in it would have to work under hight G
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[23:16] <rocketboy> hight = heigh
[23:16] <rocketboy> try high
[23:16] <LaurenceB> have you seen the spacex launch video?
[23:16] <rocketboy> yey also deploying a chute will be problematic
[23:17] <rocketboy> nope
[23:17] <LaurenceB> http://www.spacex.com/updates.php
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[23:26] <edwardmoore> just a quicky- what sort of launch rail lugs should i stick on do you reckon, steve?
[23:28] <LaurenceB> http://mfile.akamai.com/22165/wmv/spacex.download.akamai.com/22165/F1-002-Launch-WebcastHigh.asx
[23:28] <rocketboy> K - the larger one that fit the standaes
[23:28] <rocketboy> standard
[23:28] <rocketboy> launch rail (about 35mm square)
[23:29] <edwardmoore> tyvm
[23:29] <LaurenceB> edwardmoore are you launching at ears?
[23:29] <rocketboy> where are you getting them from?
[23:29] <edwardmoore> well, i'm afraid i haven't cancelled my weekend plans since you asked me this yesterday :p
[23:30] <edwardmoore> not sure- do you recommend anywhere?
[23:30] <LaurenceB> cool, sure I didnt ask yesterday tho, magbe I forgot doh
[23:30] <edwardmoore> you did :)
[23:31] <edwardmoore> don't worry, i get instant messaging amnesia syndrome all the time too
[23:31] <LaurenceB> well i'll see you sunday, you can watch my glider oscillate out of control
[23:31] <LaurenceB> or whatever it decides to do
[23:32] <edwardmoore> i won't be there on sunday....
[23:33] <LaurenceB> sorry i'm slow
[23:34] <LaurenceB> I'd better be off - sleep
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[23:36] <rocketboy> well if you want I can get you some sunday
[23:36] <rocketboy> and pop in the post
[23:36] <rocketboy> a couple of the rocketry vendors will be there
[23:37] <rocketboy> (ed)
[23:37] <edwardmoore> that would be grand if you could
[23:38] <edwardmoore> very much appreciated
[23:38] <rocketboy> OK - I'm off too
[23:38] <edwardmoore> h'ok cya soon
[23:39] <edwardmoore> ta again
[23:39] <rocketboy> cu
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[00:00] --- Fri Mar 30 2007