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Dear Mr. Baumann,
The main focus is on getting it to its designated landing site
with a launch from the stratosphere.
Our craft will probably not generate a lot of lift at those high
altitudes and will most probably be in some sort of free fall for
the first 10-20km but we will do detailed simulations on this in
the coming weeks. We must stay within weather balloon regulations
to get it up their without much special permissions so the size
and weight are very limited.
Kind regards,
Pieter
On 19/11/2012 17:38, Tilman Baumann wrote:
I don't think I can help with
practical issues.
But I wonder, does the design call for the balloon to pop in the
stratosphere?
The term Blimp confuses me.
Is it about coming home, or about zipping around in the
stratosphere?
I'm very interested in high altitude glider projects. But I
don't think very much has been done in practice yet. But it's
such a cool idea.
On 19/11/12 16:26, P.J.S. Danneels wrote:
Dear Paparazzi community,
Allow me to introduce our project to you.
We are a group from the Delft University of Technology faculty
of Aerospace Engineering.
Our goal is to design and later build a UAV which is launched
from a weather balloon in the stratosphere (say about 35km
altitude).
It should then return to the landing site without using direct
propulsion.
What is interesting for this mailing list:
- we will use paparazzi as the autopilot
- we must have 2 way communication with the vehicle to retrieve
weather data and manipulate it's flight.
- loads of other UAV-stuff
Some initial calculations, thoughts and requirements:
- Balloon might drift allot during ascent. A drift of up to
300km might well be possible according to some simulations.
- To stay within weather balloon regulations the weather balloon
payload (return vehicle + release mechanism) may not exceed 3kg
- The configuration at launch cannot have a diameter exceeding
2m
- We cannot use propulsion to gain or keep altitude but we can
accumulate energy on the descent and then use it in some way to
decelerate the craft on it's final approach.
- We need to film the mission in HD
- We need to be able to take a scientific payload with us.
Currently not yet defined but will most probably be meteorologic
sensors.
An initial question:
- 2 way communication over a range of 300km is almost not
possible using a direct link to a single ground station, so we
are tempted to use satellite communication modules like the
Iridium 9603 is there any experience in this community regarding
these modules and interfacing them to paparazzi?
I believe lots of you might find this an interesting problem.
As none of us has much experience with UAV's and paparazzi any
idea's or advice is welcome.
Our team consists of 10 highly motivated students, some with
expertise in aero, some in embedded electronics, other in
aircraft structures, ...etc.
If you guys like this we could post an update on our project
from time to time. And share our finding with you.
We hope to hear from you guys with any thoughts, questions,
idea's.
Kind regards,
Pieter Danneels
StratoBlimp project
(don't let the name fool you, it's not going to be a blimp... we
think)
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