Danish rocket flies

The Danes test launched that rocket that's going to carry a human passenger:
http://dvice.com/archives/2011/06/first-test-of-d.php
Rocket went up fine, but the parachute didn't deploy right.

Pat

Pat Flannery wrote:

The Danes test launched that rocket that's going to carry a human passenger:
http://dvice.com/archives/2011/06/first-test-of-d.php
Rocket went up fine, but the parachute didn't deploy right.

It was aborted early to avoid going out of the restricted area. The
booster was likely too heavy with fuel for the parachute and/or the
speed too high.

--
Mvh./Regards, Niels Jørgen Kruse, Vanløse, Denmark

In message
(Niels Jørgen Kruse) wrote:

Pat Flannery wrote:

The Danes test launched that rocket that's going to carry a human passenger:
http://dvice.com/archives/2011/06/first-test-of-d.php
Rocket went up fine, but the parachute didn't deploy right.

It was aborted early to avoid going out of the restricted area. The
booster was likely too heavy with fuel for the parachute and/or the
speed too high.

Too fast according to reports. The abort sequence was wrong and the
parachute deployed while the craft was still supersonic resulting in
damage to the canopy.

Anthony

In article
tatelephone,
says...

The Danes test launched that rocket that's going to carry a human passenger:
http://dvice.com/archives/2011/06/first-test-of-d.php
Rocket went up fine, but the parachute didn't deploy right.

While not a completely successful, this does show what you can do on a
shoestring budget. The fact that they made a somewhat successful first
flight is definately progress.

Jeff
--
" Solids are a branch of fireworks, not rocketry. :-) :-) ", Henry
Spencer 1/28/2011

Anthony Frost wrote:

Too fast according to reports. The abort sequence was wrong and the
parachute deployed while the craft was still supersonic resulting in
damage to the canopy.

The horizontal speed component doesn't drop as easily as the vertical.

--
Mvh./Regards, Niels Jørgen Kruse, Vanløse, Denmark

On 6/4/2011 4:28 AM, Anthony Frost wrote:
Too fast according to reports. The abort sequence was wrong and the
parachute deployed while the craft was still supersonic resulting in
damage to the canopy.

Was the pulsing visible in the rocket exhaust during ascent intentional
or were they having some sort of engine trouble?

Pat

Pat Flannery wrote:

On 6/4/2011 4:28 AM, Anthony Frost wrote:
Too fast according to reports. The abort sequence was wrong and the
parachute deployed while the craft was still supersonic resulting in
damage to the canopy.

Was the pulsing visible in the rocket exhaust during ascent intentional
or were they having some sort of engine trouble?

There was pulsing in the static test also.

Pilots view video:
http://www.youtube.com/watch?v=91Qm1GdBQE8

You can see how the pilot is pushed back in his seat relative to the
radar transponder in front of him.

--
Mvh./Regards, Niels Jørgen Kruse, Vanløse, Denmark

On 6/4/2011 10:14 PM, Niels Jørgen Kruse wrote:

Was the pulsing visible in the rocket exhaust during ascent intentional
or were they having some sort of engine trouble?

There was pulsing in the static test also.

Pilots view video:
http://www.youtube.com/watch?v=91Qm1GdBQE8

You can see how the pilot is pushed back in his seat relative to the
radar transponder in front of him.

The pulsing variations in thrust can really be seen there, can't they?
Does it use a pressure-fed engine? Because it looks like they are
getting back pressure against the fuel feed system by pressure in the
combustion chamber as it fires.


Pat

Pat Flannery wrote:

On 6/4/2011 10:14 PM, Niels Jørgen Kruse wrote:

Was the pulsing visible in the rocket exhaust during ascent intentional
or were they having some sort of engine trouble?

There was pulsing in the static test also.

Pilots view video:
http://www.youtube.com/watch?v=91Qm1GdBQE8

You can see how the pilot is pushed back in his seat relative to the
radar transponder in front of him.

The pulsing variations in thrust can really be seen there, can't they?
Does it use a pressure-fed engine? Because it looks like they are
getting back pressure against the fuel feed system by pressure in the
combustion chamber as it fires.

Yes it is pressure fed.

I wonder if they manage to burn all the LOX at the start (before the
engine starts pulsing) or excess is blown out the back. That would make
backpressure less dependent on LOX flow.

--
Mvh./Regards, Niels Jørgen Kruse, Vanløse, Denmark

Pat Flannery wrote:

The interesting part is the use of rollerons to stabilize it. I assume
they spin these up with compressed air prior to launch, and although
that would allow the gyros to pivot the fins, how much control authority
the fins have looks kind of iffy to me considering their small size.

I don't believe they were spun up for launch. The rocket was supposed to
rotate, just not too fast for the pilot. Rotation was their best hope of
canceling out bias and getting the thing to go straight up.

--
Mvh./Regards, Niels Jørgen Kruse, Vanløse, Denmark