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Old Oct 01, 2012, 07:18 PM
deTonaTor_NZ is offline
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Religion= suffering/wars
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Dude, I would be very concerned about equipment freezing up!

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Originally Posted by jb_bak View Post
I'm exploring the idea of sending my X8 up to around 30K feet with a 1300g weather balloon. If this goes well I might try higher. I have an APM2.5 that will autonomously fly back overhead and circle while coming down.

I need to strengthen the wings and elevons to handle the higher true airspeed anticipated. I was thinking of .73 oz fiberglass cloth on wings, and kevlar on the nose (I already have some, just finish off the upper part and cover the holes)

Can anyone shed light on ideas on getting the X8 up for the challenge? Maybe running an extra carbon fiber spar or two?
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Old Oct 01, 2012, 08:26 PM
Dirt-Torpedo is offline
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...just an earth bound misfit
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Quote:
Originally Posted by deTonaTor_NZ View Post
Dude, I would be very concerned about equipment freezing up!
Sounds like a very reasonable concern:
http://en.wikipedia.org/wiki/U.S._Standard_Atmosphere
Standard ambient temperature at those altitudes is -50F (-45C), which is getting well into milspec temperature range. For sure the Lipos don't want to be charged to 4.2V/cell either.

Depending on balloon lift, lipo-powered thermostatically-controlled heaters and insulation may be the way to go, but that's going to take some quality modelling based on experimental data.

Servos may be fun to winterproof.
Old Oct 02, 2012, 08:45 AM
PittSpecial is offline
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Right Rudder
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Quote:
Originally Posted by Dirt-Torpedo View Post
Sounds like a very reasonable concern:
http://en.wikipedia.org/wiki/U.S._Standard_Atmosphere
Standard ambient temperature at those altitudes is -50F (-45C), which is getting well into milspec temperature range. For sure the Lipos don't want to be charged to 4.2V/cell either.

Depending on balloon lift, lipo-powered thermostatically-controlled heaters and insulation may be the way to go, but that's going to take some quality modelling based on experimental data.

Servos may be fun to winterproof.
No need for Heaters. NASA's Rocket U Ballon Project uses two Thunder Power 3-Cell, 2250mAH, Li-POLYs and they are inserted in foam, period.

Rocket U: Engineers Push New Limits (2 min 4 sec)
Old Oct 02, 2012, 07:07 PM
Dirt-Torpedo is offline
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...just an earth bound misfit
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Quote:
Originally Posted by PittSpecial View Post
No need for Heaters. NASA's Rocket U Ballon Project uses two Thunder Power 3-Cell, 2250mAH, Li-POLYs and they are inserted in foam, period.
I'll assume these guys didn't just pick a random piece of foam out of the trash and HOPE for the best. The point is that thermal design and management is appropriate to operation at 30,000 ft. Would be nice to get an explanation on why the burn wire failed to terminate the ascent at the planned peak of 80,000 ft?

While my ultra-micros have their 1S120 packs' lifeblood sapped by a -10C prop blast (even in a cozy duct tape pocket filled with cottonballs), self-heating often leaves my 3S2200's uncomfortably hot to the touch in -10C weather.

Depending on the system you might even want to worry about over insulating in that thin air, and needing to dump heat. I know that SSD Macbook Pros are working at 50% density altitudes of the 22,000 ft base camp on Everest but I haven't seen any pics on the 33% density altitude of the 29,000 ft summit.

Rocket U seems really sad to me but let's pray that it's more than just an idling HOPE for a return to bygone glories.

Here's a pretty extreme low temperature battery problem:
http://jproc.ca/rrp/alert_power_system.html
Last edited by Dirt-Torpedo; Oct 02, 2012 at 07:15 PM.
Old Oct 02, 2012, 08:45 PM
PittSpecial is offline
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Right Rudder
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Quote:
Originally Posted by Dirt-Torpedo View Post
Rocket U seems really sad to me but let's pray that it's more than just an idling HOPE for a return to bygone glories.
Sadly, I believe it is going to get worse! You know that saying?

Prepare for the worse and hope for the Best!

Budget outlays for 2013 does not look nice. The only saving grace "is" we NASA is operating on a continuing resolution CR until January 1st, 2013 and at that time your guess is as good as mine!

Thanks for your reply, I am not a Rocket U member but, I will ask someone in my office to answer some of your posted points.
Old Oct 04, 2012, 12:01 PM
Beauregard is offline
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My three sons...
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Wondering if anyone has loaded up the x8 with a 1.5lb payload? I'm wanting to put a real camera on one...
Old Oct 04, 2012, 12:18 PM
xviper is online now
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1.5 lbs for this plane is nothing. People have put 20,000 mah worth of batteries in it. That's nearly 5 lbs right there. You could fly a 6 pack of beer to gramma's house.
Old Oct 04, 2012, 02:38 PM
TooSLow2Care is offline
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insert witty phrase here
The manual states that TOW is 3.2Kg. the airframe weighs in at 880g that leaves you 2,320g of payload and avionics. or 5.11lbs... your 1.5lb camera (680g) is nothing for this airframe. it will carry my Nikon D90 (w/18-55mm lens) at 767g(1.7lbs) or my Canon 7D (w/18-55mm lens) at 1043g(2.3lbs) without an issue...

though i have my own camera system developed and being installed in my X8 that is, in my mind the correct system to use. instead of putting a human form factor camera in the air.

cheers,
Brian
Last edited by TooSLow2Care; Oct 04, 2012 at 02:38 PM. Reason: fat-fingered the keyboard a few times :P
Old Oct 04, 2012, 05:00 PM
Andre6553 is offline
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Vulcan skyhook multirotor
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Quote:
Originally Posted by xviper View Post
You could fly a 6 pack of beer to gramma's house.
Does your gramma drink beer
Old Oct 04, 2012, 05:04 PM
Beauregard is offline
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My three sons...
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Thanks.. Thats great news.. I'm thinking of mounting the Sony cx760..
Old Oct 04, 2012, 05:29 PM
xviper is online now
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Does your gramma drink beer
Naw, that's for when I go visit. She's too busy smokin weed.
Old Oct 04, 2012, 08:29 PM
OzparkPilot is offline
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Watts up ?
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Originally Posted by xviper View Post
Naw, that's for when I go visit. She's too busy smokin weed.
Haha, she sounds like my grandma !
Old Oct 05, 2012, 06:31 AM
Rastislavko is online now
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You can't take the sky from me
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White X8 is now in stock on HobbyKing for a very reasonable price of $167.65 (platinum)...
Old Oct 05, 2012, 07:24 AM
bracky72 is offline
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Questionable judgement
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Originally Posted by xviper View Post
Naw, that's for when I go visit. She's too busy smokin weed.

I just realized I know you from s2000 land. Small world.
Old Oct 05, 2012, 08:46 AM
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Originally Posted by Rastislavko View Post
White X8 is now in stock on HobbyKing for a very reasonable price of $167.65 (platinum)...
Don't expect any credit for that affiliate link - they don't allow form spam.
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