Author Topic: Delft Aerospace Rocket Engineeing (DARE) (Read 26918 times)

Steven Pietrobon · « **on:** 12/24/2015 04:06 am »

Here's an amateur group from The Netherlands that has the European amateur rocket altitude record of 21.5 km with their Stratos II+ rocket on 16 October 2015 from the El Arenosillo base in Southern Spain. They were going for 50 km. There's a cool video. They are using a hybrid engine with nitrous oxide oxidiser and a mixture of sorbitol, paraffin and aluminium powder fuel.

http://dare.tudelft.nl/

Steven Pietrobon · « **Reply #1 on:** 12/24/2015 04:13 am »

Launch of Stratos I from Sweden on 17 March 2009 to an altitude of 12.5 km.

Steven Pietrobon · « **Reply #2 on:** 12/24/2015 04:22 am »

Stratos II misfire on 15 October 2014, also from Spain.

Rik ISS-fan · « **Reply #3 on:** 01/25/2016 12:49 pm »

DARE has updated their site a bit lately. But first some things that have been known for some while.

First I will point to the Dare intrest drink presentation from last September. link (direct download)
Lots of information about current projects at DARE are in this presentation.

Last year in November there should have been a launch opportunity at 't harde (SLD 2015-3), but because nothing was reported about the event, most likely it was canceled because of bad weather. At least two events would have been executed by Dare in november. An liquid engine test, and the launch of the active controlled CSL v7s for the ACT team. Also a Transonic Reasearch Vehicle TRV-1 was planned but I'm not sure if it was build, and what the status is right now. The engine for this vehicle LEONIDAS 5 (or6) was the topic of the master thesis from Olga O. Motsyk. (it can be found online).

For this year there are three launch oportunities at 't Harde: SLD 2016-1 19&20 May, SLD 2016-2 27&28 may and SLD 2016-3 22&23 sept. At least three launches are planned (besided the Egg challange SRP). The CSL v7s from the Active Control Team, DRAD with the deimos F engine from the Deimos liquid engine team. And one more I will write about later.

Each year a minor is organised by dare for bachelor students. The engine test stand, that was used to test the DHX-200 Aurora, the hybrid engine that propelled Stratos II+ was developed during a previous minor. Two years ago the minor was about an active controlled rocket, the Active Control Team (ACT) developed from this.
The purpose of this years minor is to design a test-bench for a 10kN cryogenic engine.

Along with this minor a new team has been formed the Cryogenic team. Their goal is to develop a 10kN LOx-LCH4 (methane) engine. This engine will be tested on test-bench build during the minor at DLR Trauen. The engine is developed with cooperation of (Italian) CIRA.

Than the latest change: a new Project AETHER.
This is a shared project between Solid Six, Capsule Team and Advanced Control Team. The purpose of the project is to test new technologies that will be used in Stratos III. The ACT is going to test their Stability Augmentation System at supersonic speeds during this launch. And the Capsule and Recovery team is developing a new recovery system that can operate at more conditions.
The rocket will fly be four meters tall (~157,5") is aimed to reach 6km altitude (half the altitude of Stratos I) and will be powered by the solid engine Leonidas 5 or 6 with 38kg (~85,4lb) of Kalinidex (>30kNs, 6,5kN O-class). It is planned to be launched November 2016 from the Netherlands, but I couldn't find a launch window during this period. That was all I had about DARE

Rik ISS-fan · « **Reply #4 on:** 01/25/2016 12:55 pm »

Here also a link to DARE's facebook page and the

Rik ISS-fan · « **Reply #5 on:** 03/21/2016 03:36 pm »

Dare has updated their website, with more info about AETHER

Rik ISS-fan · « **Reply #6 on:** 10/26/2017 02:19 pm »

DARE made a image with most of the rockets DARE has developed.
DARE Tweet; DARE Facebook; Instagram

I forgot to add this:

catdlr · « **Reply #7 on:** 12/03/2017 07:41 pm »

DARE | DHX-400 'Nimbus' Hybrid Rocket Test 9

Delft Aerospace Rocket Engineering
Published on Dec 3, 2017

A student society that builds a record-breaking hybrid rocket engine powerful enough to lift an SUV? Check out the ninth engine test video. Unfortunately, 12 seconds into the burn an engine failure occurred.

Currently, it is believed the failure was caused due to an injector failure. It is hypothesized that the injector overheated due to an instability causing an increase in Oxidiser mass flow, which led to the chamber wall overheating and finally failing. A low and high-frequency oscillation event has been seen in the data and research to minimise these oscillations is being conducted.
Our engineers are working hard on a forensic analysis to discover the cause and find a solution.

Due to our thorough safety procedures, no personnel was here harmed, however, one pumpkin was never seen again.

Rik ISS-fan · « **Reply #8 on:** 12/03/2017 10:31 pm »

The DARE STRATOS III team also saw pressure oscilation during the 8th Nimbus 400 (kNs) engine test. The video is on youtube.
The STRATOS team also went to Germany to visit WARR and sponsors MT Aerospace and Winkelmann.
Thanks to those two companies, GKN Fokker and Airbore; DARE can use a COPV N2O tank on Stratos III.
Tweet with test tank production.

Rik ISS-fan · « **Reply #9 on:** 12/08/2017 07:37 pm »

Dare updated their website with the Stratos III Technical Overview.
Let's also add this facebook burst test video

catdlr · « **Reply #10 on:** 12/13/2017 04:31 pm »

DARE | Cryogenic Engine Igniter Test

Delft Aerospace Rocket Engineering
Published on Dec 13, 2017

A student society that builds a record-breaking hybrid rocket engine powerful enough to lift an SUV? The Cryogenic Propulsion Team recently tested their spark torch igniter for the second time. Watch the video to check it out!

Rik ISS-fan · « **Reply #11 on:** 02/23/2018 02:05 pm »

Some news on StratosIII:

Launch site will be at INTA Spain ; tweet
DARE article about the recovery system

video from DHX-400 Nimbus engine test 11, the full duration burn of this ~400kN.s N2O Sorbitol-Parafin-Aluminium hybrid engine.

edited to add: oerlikon Article

FutureSpaceTourist · « **Reply #12 on:** 06/07/2018 12:45 pm »

Quote

This launch tower will be raised in only 40 days! Don't miss the rocket launch on 16th of July 🚀

https://twitter.com/DARE_TUDelft/status/1004700478012297217

catdlr · « **Reply #13 on:** 07/13/2018 08:33 pm »

Stratos III rocket ready to launch

Delft Aerospace Rocket Engineering
Published on Jul 13, 2018

The Stratos III launch campaign has started! Our first launch attempt is on July 18, 2018, at 9.35 PM CEST. The live stream will be available at http://dare.tudelft.nl/live-stream/ and on this channel!

Rik ISS-fan · « **Reply #14 on:** 07/13/2018 11:39 pm »

I think a fitting motto for the Stratos III launch operation is:
'Students testing the path for the professionals!' 😀
The best of luck DARE.

Rik ISS-fan · « **Reply #15 on:** 07/15/2018 10:18 am »

Tweet from DARE:
The first launch attempt of Stratos III has been rescheduled to the 20th of July at 20:00 CEST. The Flight Termination System, a crucial component of the rocket, is currently stuck at customs in the U.S. which forced us to postpone the launch.

Darn ITAR. Wasn't there a European alternative?
20:00 CEST = 18:00 UTC.

Rik ISS-fan · « **Reply #16 on:** 07/18/2018 04:47 pm »

Delay #3 tweet:
The launch of #StratosIII has been rescheduled to Tuesday July 24 at 20:00 CEST, due to a significant delay in shipping the Flight Termination System, which is currently stuck at customs in the US. As safety has our highest priority, a rescheduling of the launch was inevitable.

catdlr · « **Reply #17 on:** 07/24/2018 04:13 pm »

live video.

Stratos III: Rocket Launch
Delft Aerospace Rocket Engineering
Started streaming 3 hours ago

We're launching the biggest rocket in the history of DARE - Stratos III. Our goal - break the European student altitude record! Don't miss the rocket lift-off at 9 PM CEST.

Olaf · « **Reply #18 on:** 07/24/2018 06:26 pm »

Launch has been cancelled for today.
Winds are not favourable.

FutureSpaceTourist · « **Reply #19 on:** 07/25/2018 06:08 am »

Quote

☀ Good morning fellow rocket enthusiasts! Another day, another launch attempt. Let's hope the weather is in our favor today 🙏 #StratosIII

https://twitter.com/dare_tudelft/status/1021991003182559233

FutureSpaceTourist · « **Reply #20 on:** 07/25/2018 12:17 pm »

Quote

The tower is now being raised and we are ready for the countdown. T-6:53 hours remaining 🕒

https://twitter.com/dare_tudelft/status/1022090772970184706

catdlr · « **Reply #21 on:** 07/25/2018 05:41 pm »

Stratos III: Rocket Launch Attempt 2

Delft Aerospace Rocket Engineering
Started streaming 5 hours ago

We're launching the biggest rocket in the history of DARE - Stratos III. Our goal - break the European student altitude record! Don't miss the rocket lift-off at 9 PM CEST

FutureSpaceTourist · « **Reply #22 on:** 07/25/2018 09:17 pm »

Currently holding at T-15:00

Elthiryel · « **Reply #23 on:** 07/25/2018 10:30 pm »

They want to heat the oxidizer vessel for the pressure to reach 60 bar, to achieve optimal engine thrust. It seems that their method of heating is quite slow and it will probably take another hour or so. By the way, there was some venting from the rocket, because they had some mass sensor issues during tanking and had to release excess mass.

I hope they manage to launch it, I'm in the student team that builds rockets too, so it's another reason to support them.

Elthiryel · « **Reply #24 on:** 07/25/2018 11:31 pm »

Quote

We are still planning to launch. We just vented to our final fill mass. Please Stand by!

So there's still a chance for a launch today. I don't know the precise launch window, but I've been told it ends "sometime in the morning", and it's 1:30 AM at the launch site right now.

DaveS · « **Reply #25 on:** 07/26/2018 12:56 am »

Hold released. T-14 minutes. Targeted T0 is 0111 UTC.

DaveS · « **Reply #26 on:** 07/26/2018 01:10 am »

Holding at T-60 seconds to configure the FTS for launch.

DaveS · « **Reply #27 on:** 07/26/2018 01:16 am »

T-60 seconds and counting.

DaveS · « **Reply #28 on:** 07/26/2018 01:17 am »

LIFT-OFF!

DaveS · « **Reply #29 on:** 07/26/2018 01:17 am »

FAILURE! VEHICLE LOST!

DaveS · « **Reply #30 on:** 07/26/2018 01:18 am »

Test Conductor has instructed the team to remain at their stations.

DaveS · « **Reply #31 on:** 07/26/2018 01:21 am »

Looks like full vehicle break up at T+19 seconds with the failure beginning at T+17 seconds.

DaveS · « **Reply #32 on:** 07/26/2018 01:22 am »

No fires at the pad confirmed but TC wants everyone to stay indoors for now.

DaveS · « **Reply #33 on:** 07/26/2018 01:26 am »

More information to come:

Mammutti · « **Reply #34 on:** 07/26/2018 01:31 am »

DaveS · « **Reply #35 on:** 07/26/2018 01:35 am »

Recorded captures of the vehicle failure. First is at T+17 seconds and the second is at T+20 seconds. The break up is clearly visible to the ground IR camera in the lower right view.

DaveS · « **Reply #36 on:** 07/26/2018 01:40 am »

Live stream ended. Information will be released on the relevant social media accounts.

catdlr · « **Reply #37 on:** 08/31/2018 05:14 pm »

Stratos III Rocket Launch Aftermovie

Delft Aerospace Rocket Engineering
Published on Aug 31, 2018

This is the official after movie of the Stratos III sounding rocket launch on July 25 at 3.30 AM CEST. As can be seen in the footage, 20 seconds into the flight, an anomaly occurred, resulting in a loss of the vehicle. We are currently still investigating this anomaly and will keep you up to date via our social media once we know more!

Rik ISS-fan · « **Reply #38 on:** 09/02/2018 11:44 am »

Apperently the video posted by catdlr shouldn't have been made public. It showed a small KNDX rocket motor test.
Also the Stratos advanture continues with Stratos IV, planned for launch in 2019.

catdlr · « **Reply #39 on:** 09/03/2018 07:17 am »

Quote from: Rik ISS-fan on 09/02/2018 11:44 am

Apperently the video posted by catdlr shouldn't have been made public. It showed a small KNDX rocket motor test.
Also the Stratos advanture continues with Stratos IV, planned for launch in 2019.

Yep, post deleted.

Rik ISS-fan · « **Reply #40 on:** 09/10/2018 07:30 pm »

Quote from: catdlr on 09/03/2018 07:17 am

Quote from: Rik ISS-fan on 09/02/2018 11:44 am
Apperently the video posted by catdlr shouldn't have been made public. It showed a small KNDX rocket motor test.
Also the Stratos advanture continues with Stratos IV, planned for launch in 2019.

Yep, post deleted.

That video isn't available any more. But a new one is on twitter.

catdlr · « **Reply #41 on:** 10/28/2018 07:45 pm »

Spark Torch Rocket Igniter Test

Delft Aerospace Rocket Engineering
Published on Oct 28, 2018

Test of the spark torch igniter performed by the Cryogenic Propulsion Team on October 16, 2018. The igniter uses gaseous hydrogen and oxygen to produce a hot flame to igniter the ethanol-liquid engine. Note that due to the extremely high temperature of the hydrogen-oxygen reactants, (almost) no flame is visible.

Delft Aerospace Rocket Engineering is a team from Delft University of Technology and one of the leading student rocketry teams in the world. Follow us on social media to stay up-to-date!

catdlr · « **Reply #42 on:** 12/24/2018 10:08 am »

DHX-400 'Nimbus' Hybrid Rocket Engine Test 17

Delft Aerospace Rocket Engineering
Published on Dec 24, 2018

Test 16 of the DHX-400 'Nimbus' hybrid rocket motor for the Stratos IV student built sounding rocket.

Delft Aerospace Rocket Engineering is a student-team of Delft University of Technology and one of the largest and most advanced student rocketry teams in the world.

dare · « **Reply #43 on:** 02/15/2019 04:43 pm »

In the Netherlands, there is a student rocket program named Stratos IV, which is aiming to shoot for space in the summer of 2019. Stratos IV is a hybrid rocket developed by Delft Aerospace Rocket Engineering (DARE), an 18 year old student rocketry team of members of the TU Delft. DARE designs, develops and tests experimental rockets for scientific purposes.

In the past DARE already made significant progress on its way to space, with Stratos II+ reaching 21.5 km in 2015. Its successor, Stratos III was launched in the summer of 2018 with the goal to get even closer to space. Unfortunately, due to an anomaly, the 8.2-meter tall vehicle disintegrated at roughly 10 km altitude.

Based on the capabilities and potential of the Stratos III design, Stratos IV was developed and builts on DARE's hybrid rocket technology. The vehicle features active roll stabilization and the most powerful student-built hybrid engine in the world, we a peak thrust of 25 kN. The design is recently revealed, and the vehicle is currently under construction for its space shot in August 2019.

Find their new design in the video below!
https://www.youtube.com/watch?time_continue=3&v=H5lGYTb1jOw

Rik ISS-fan · « **Reply #44 on:** 02/15/2019 06:46 pm »

dare welcome on NSF. Are you related to the DARE society?

I found this Delta (TU Delft) Article: https://www.delta.tudelft.nl/article/dare-rocket-team-shoots-space
Launch from the Denel Overberg test rangein South Africa.
AFAIK Dare is building two rockets for their Stratos IV launch mission. They are developed from Stratos III, the titanium nozzle was already developed for Stratos III but it wasn't ready in time. Dare will use it on Stratos IV.

Are you taking the NLR flight computer as payload again?

Steven Pietrobon · « **Reply #45 on:** 02/16/2019 03:20 am »

Quote from: dare on 02/15/2019 04:43 pm

Based on the capabilities and potential of the Stratos III design, Stratos IV was developed and builts on DARE's hybrid rocket technology. The vehicle features active roll stabilization and the most powerful student-built hybrid engine in the world, we a peak thrust of 25 kN. The design is recently revealed, and the vehicle is currently under construction for its space shot in August 2019.

Thanks for the update and best of luck on the launch. Can you tell us where Stratos IV is launching from?

dare · « **Reply #46 on:** 02/16/2019 08:21 am »

Quote from: Rik ISS-fan on 02/15/2019 06:46 pm

dare welcome on NSF. Are you related to the DARE society?

I found this Delta (TU Delft) Article: https://www.delta.tudelft.nl/article/dare-rocket-team-shoots-space
Launch from the Denel Overberg test rangein South Africa.
AFAIK Dare is building two rockets for their Stratos IV launch mission. They are developed from Stratos III, the titanium nozzle was already developed for Stratos III but it wasn't ready in time. Dare will use it on Stratos IV.

Are you taking the NLR flight computer as payload again?

Indeed the titanium nozzle was already developed for Stratos III, however, some slight modification will be made for Stratos IV. In addition, the team is also eliminating the heavy aluminum combustion chamber, and replacing this by a fully composite chamber.

As you can read in the article of DELTA, the current plan is indeed to launch from the Denel Overberg Test Range. With regards to the payload, Stratos IV will again fly one (or multiple) scientific payloads on its journey to the Karman line. We will soon share more details about the exact payloads that Stratos IV will fly!

Rik ISS-fan · « **Reply #47 on:** 02/16/2019 05:16 pm »

Very good job by also replacing the aluminium combustion chamber by a composite one.
I've four questions concerning the composite combustion chamber:
1) Are you using carbon-fiber or glas-fiber for the chamber.
2) DARE has experience with glass-fiber, do you also have experience with carbon fiber casings?
3) Is the solid six (or alumini) involved with the composite casing development or is it part of StratosIV.
Lastly 4) are further static tests planned to prove the composite casing together with the titanium nozzle?

Another question came to mind: are you using the same oxidizer injection system as on stratos III?Or did you have to change it for the composite combustion chamber.

Thanks for the info. I'll anxiously wait for more detail about the payload.
Is there another croudfunding planned?

Rik ISS-fan · « **Reply #48 on:** 02/22/2019 03:29 pm »

Thanks DARE for the nice January & February news letter. DARE Newsletters

dare · « **Reply #49 on:** 02/22/2019 04:20 pm »

Quote from: Rik ISS-fan on 02/16/2019 05:16 pm

Very good job by also replacing the aluminium combustion chamber by a composite one.
I've four questions concerning the composite combustion chamber:
1) Are you using carbon-fiber or glas-fiber for the chamber.
2) DARE has experience with glass-fiber, do you also have experience with carbon fiber casings?
3) Is the solid six (or alumini) involved with the composite casing development or is it part of StratosIV.
Lastly 4) are further static tests planned to prove the composite casing together with the titanium nozzle?

Another question came to mind: are you using the same oxidizer injection system as on stratos III?Or did you have to change it for the composite combustion chamber.

Thanks for the info. I'll anxiously wait for more detail about the payload.
Is there another croudfunding planned?

The combustion chamber for Stratos IV will be designed out of a carbon fiber structure. In the past we used glass fiber for Aether, however this will also be replaced with carbon fiber. For Stratos III already a lot of parts were manufactured out of carbon fiber (eg. tank with cf overwrap). The solids team is also considering the use of a carbon combustion chamber for the Aether mission and their Icarus motor. Within the next 2 months, we will conduct multiple tests of the DHX-400 Nimbus. Of course, the whole system will also be tested with carbon combustion chamber and titanium nozzle. The oxidizer system remains the same.

We will indeed also do a crowdfunding this year. This will likely start within a month from now and announced via our usual social media channels.

DARE

catdlr · « **Reply #50 on:** 03/01/2019 03:58 am »

Stratos III Student Rocket - Aftermovie 2

Delft Aerospace Rocket Engineering
Published on Feb 28, 2019

Second after movie of the Stratos III launch campaign.

Delft Aerospace Rocket Engineering is a student-team of Delft University of Technology and one of the largest and most advanced student rocketry teams in the world.

catdlr · « **Reply #51 on:** 03/01/2019 09:34 am »

Stratos IV Rocket - Design Presentation

Delft Aerospace Rocket Engineering
Published on Mar 1, 2019

A re-recording of the Stratos IV design reveal presentation, the rocket aiming for space in August 2019.

catdlr · « **Reply #52 on:** 03/12/2019 03:01 am »

Composite Overwrap Stratos IV Rocket Oxidizer Tank

Delft Aerospace Rocket Engineering
Published on Mar 11, 2019

Timelapse of the composite overwrap of the Stratos IV rocket flight tanks. This is done using the filament winding technique. The tanks are flight hardware and stores a total of 174 kg of nitrous oxide oxidizer at a pressure of 60 bar.

Delft Aerospace Rocket Engineering is one of the largest and most advanced student rocketry teams of the world. With over 18 years of experience in high-power rocketry, our goal is to reach space with a fully student-built rocket. As a Dreamteam of Delft University of Technology, we aim at providing students with a hands-on experience that is unique in this world. Next, to our Stratos and Aether flagship projects, the society also conducts fundamental research in all fields of sounding rocketry, such as propulsion, recovery, control, structural design and recovery.

dare · « **Reply #53 on:** 06/14/2019 02:28 pm »

Yesterday DARE unveiled their new Stratos IV rocket, aiming for space in the summer of 2020.

Of course, for this special occasion you do need an appropriate way to transport the rocket from A to B 😉

Design unveil stream at

octavo · « **Reply #54 on:** 07/22/2019 08:55 am »

Quote from: dare on 02/16/2019 08:21 am

the current plan is indeed to launch from the Denel Overberg Test Range.

Hi dare,

Is this still the case? As a South African rocketry fan, it is super rare for us to get to see any kind of launch at all, and I would absolutely make the trip down to Cape Town to watch. Are there any details available for curious spectators and rocket fans?

catdlr · « **Reply #55 on:** 07/22/2019 09:45 am »

Radiation Heat Transfer in a Rocket Nozzle

Delft Aerospace Rocket Engineering
Published on Jul 22, 2019

Test 20 of the DHX-400 'Nimbus' hybrid rocket engine, for the Stratos IV project, demonstrating the successful use of a 3D printed titanium composite nozzle structure, with a graphite insert.

Delft Aerospace Rocket Engineering is one of the largest and most advanced student rocketry teams in the world. As a Dreamteam of Delft University of Technology, we aim at providing students with a hands-on experience that is unique in this world. Next to our Stratos and Aether flagship projects, the DARE conducts fundamental research in all fields of sounding rocketry, such as propulsion, recovery, control, structural design and recovery.

Fmedici · « **Reply #56 on:** 10/15/2021 10:33 pm »

Today's launch attempt of the Stratos IV rocket was scrubbed, next attempt will be on October 20 according to the description of the webcast.

(PS: is this the right thread? I couldn't find where the latest info have been published)

Steven Pietrobon · « **Reply #57 on:** 10/16/2021 02:10 am »

Here's the link for the livestream.

Steven Pietrobon · « **Reply #58 on:** 10/16/2021 02:13 am »

View of the vehicle on the pad.

russianhalo117 · « **Reply #59 on:** 10/18/2021 01:56 pm »

Livestream for second attempt:

Fmedici · « **Reply #60 on:** 10/21/2021 06:24 am »

Second attempt scrubbed, new attempt on Friday/Saturday:

https://twitter.com/daretudelft/status/1450906565364666382

russianhalo117 · « **Reply #61 on:** 10/21/2021 08:18 pm »

Livestream for attempt 3:

Terrible T · « **Reply #62 on:** 10/23/2021 01:50 pm »

New attempt for Dare today 17.00(UT+2)

https://twitter.com/daretudelft/status/1451893825417498627
https://www.youtube.com/channel/UC5iWtNmAqYIfuE69uA4df7A

russianhalo117 · « **Reply #63 on:** 10/23/2021 05:22 pm »

Final attempt in the present launch period:

Steven Pietrobon · « **Reply #64 on:** 11/16/2021 05:09 am »

The launch was aborted and the team has headed back home.

"24 Oct StratosIV Update: We are updating you all that the team has decided to not go through with the launch tonight. Troubleshooting with the Quick Disconnect (QD) throughout the day did not lead to a solution that the team was confident in or predictable, but most of all safe. After discussions between management and the crew at the pad, it was deemed infeasible and unsafe to continue any further. As this was our final launch window, the team has no other option than to return to Delft."

https://m.facebook.com/story.php?story_fbid=4574422632619136&id=430400370354737

catdlr · « **Reply #65 on:** 04/30/2022 05:46 am »

Project Sparrow | Firebolt Liquid Rocket Engine Test 4

Quote

On April 22nd, Project Sparrow performed a successful two-second test of the DLX-150A Firebolt, DARE's first functional liquid-fuel rocket engine prototype, running on a mixture of Ethanol-LOx, with a design thrust of 15kN.
The goal of the test was to validate the injector design and ignition sequence. The engine tested was a lower chamber pressure variant, and reached an average thrust of 11kN at a chamber pressure of 40 bar.

Rik ISS-fan · « **Reply #66 on:** 04/30/2022 10:07 am »

This was the 4th test of the DLX-150A Firebolt, a boilerplate version of the engine they aim to develop.
Here is a picture of the DLX-150B Firebolt, the engine they aim to develop.
Regenerative cooled, pressure feed, 15kN LOx-Ethanol. With thrust vector control.

https://dare.tudelft.nl/project-sparrow/

At the same time they are working on a 1.2kN HTP-Ethanol engine for the EUROC 2023 Dodo rocket.
https://www.instagram.com/p/Ca7O3A4Daln/

Two options: (I'm not sure which one is more correct.)
1) DARE has very bright students/members and get's acces to very advanced production technologies.
2) Modern production technologies and simulation have made rocket-science less hard.

catdlr · « **Reply #67 on:** 07/15/2022 05:43 am »

Project Sparrow | DLX-150A 'Firebolt' Liquid Rocket Engine Test 5

Quote

In July 2022, Project Sparrow performed another successful two-second test of the DLX-150A Firebolt, DARE's first functional liquid-fuel rocket engine prototype, running on a mixture of Ethanol-LOx, with a design thrust of 15kN.
The goal of the test was to validate the injector design and ignition sequence. The test targeted a chamber pressure of 30 bar, producing around 9kN of thrust.

Rik ISS-fan · « **Reply #68 on:** 07/18/2022 10:12 pm »

I think test 6 was even more impressive. the DLX-150B for ~2 sec. long ignition time though.
And besides the DLX-150B they are also developing the DODO HTP Ethanol rocket for EUROC 2023.
Are these DARE university students this smart, or is rocket science less hard than industry made it look?

russianhalo117 · « **Reply #69 on:** 10/01/2022 08:29 pm »

DLR REXUS: TU Delft SHEAR/SPEAR launch campaigns aboard REXUS 27/28 at Esrange, Sweden. The range schedule for Esrange can be found here and new missions are added once their requested launch window has been approved:
https://sscspace.com/esrange/rocket-ballon-activities/

REXUS27/28 flight's technological readiness level qualification payloads announced so far are as follows:

SHEAR (Supersonic Heatshield Experiment Aboard REXUS):
Deployable Aerodynamic Stabiliser (DAS)

SPEAR (Supersonic Parachute Experiment Aboard REXUS):
Drogue parachute materials experiment

Other relevant mission information such as all scheduled payloads:
https://rexusbexus.net/

catdlr · « **Reply #70 on:** 10/08/2022 03:24 am »

Introducing Stratos V

Quote

The Project Sparrow team recently closed its chapter on the development of a technology demonstrator for a reusable liquid rocket engine with great success. For over two years, the team has worked on the reusable DLX-150B 'Firebolt' Liquid Rocket Engine, performing cold-flow tests, perfecting injector design and ignition sequence and performing a total of 30 seconds of burn time with a reused engine. With the engine up and running, DARE is presented with a great opportunity to take on the next step. Introducing Stratos V, DARE's new flagship project. Our mission is to develop, launch and fully recover a technology demonstrator for a reusable rocket based on the liquid rocket engine developed and tested by the engineers of Project Sparrow.

catdlr · « **Reply #71 on:** 10/15/2022 02:14 am »

Hot fire testing of the DLX-150 'Firebolt' liquid bi-propellant rocket engine in order

Quote

Project Sparrow developed the DLX-150 'Firebolt‘ liquid bi-propellant engine and tested it many times. In this video, seven hot fire tests conducted over the last two years are shown in chronological order, with the engine reaching a total burn time of over 30 seconds at full flow. We are excited to design a rocket based on this incredible liquid propellant engine. Stay tuned for more!

catdlr · « **Reply #72 on:** 10/15/2022 02:16 am »

SPEAR subsystems: Drogue Parachute Deployment Device (DPDD)

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During the weeks leading up to the SPEAR launch campaign, team members will present a part that they worked on and explain their function and any encountered challenges. Get to know the SPEAR vehicle before its flight!

The fourth video, by Wim Jodehl, is on the Drogue Parachute Deployment Device (DPDD) system of SPEAR.

catdlr · « **Reply #73 on:** 10/21/2022 11:47 am »

Project Sparrow | DLX-150B 'Firebolt' Hot Fire Test 9

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In September 2022, Project Sparrow performed its fourth and last hot fire test of the regeneratively-cooled DLX-150B engine. The 3D-printed Ethanol-LOx engine ran at a reduced chamber pressure of 30 bar for 6.5 seconds, producing a steady 9 kN of thrust. Further testing of the engine will be carried out over the course of project Stratos V.

russianhalo117 · « **Reply #74 on:** 10/26/2022 06:42 am »

SPEAR payload Assembly CGI animation: