Results from RAIN

Last November 16, REXUS 11 was finally launched from Esrange, and with it the RAIN experiment. The launch was a success, not only for REXUS 11 in general, but also for the RAIN experiment. Last Tuesday the RAIN team flew back from Kiruna to Stockholm, and yesterday they gave a very interesting presentation at KTH about the launch campaign and some of the results that they obtained. Naturally most of what was collected still needs to be analyzed, but there are already some things that we can learn from RAIN’s successful launch.

For example, one thing that we can learn is related to the ejection moment itself. Upon ejection, the FFUs’ spin rate was reduced significantly due to friction, from 3.4 Hz to 1.6 Hz. A similar effect could be expected for our case as well. Also, the spinning ejection test that is supposed to be performed soon will for sure tell us more about this as well.

During the whole flight, the RAIN FFUs recorded raw GPS data and internal data, allowing to reconstruct position, velocity and acceleration for all the phases of flight. For the MUSCAT experiment, it is absolutely essencial that good data is obtained for these variables, since they will allow to derive the density and temperature profiles in the middle atmosphere. Therefore, we are especially glad that this worked out so well for them, and hope the same goes for us. In the case of RAIN, it is not possible to derive the density and temperature profiles from this data because there is also the need to have an accurate value of the drag coefficient for several Mach and Reynolds numbers. Because the RAIN FFUs are cylindrical, this is hard to obtain for them; however, the spherical shape of the MUSCAT FFUs has precisely the objective of allowing an estimation of the drag coefficient to derive these profiles.

Finally, we were also glad to know that the FFUs were recovered in only 30 minutes (take a look at some recovery photos here). Both the GPS commercial data and the modulation into a beacon signal worked out pretty well. In the meantime, the MUSCAT team will have to guaratee that this will work without failures for us too, since we need to recover 3 out of the 4 FFUs for the experiment to be a success!

Congratulations, RAIN!


REXUS 11 Launched!


The very much anticipated REXUS 11 launch took place last week if someone missed it. We are all happy that our fellow KTH REXUS team RAIN finally got to put their experiment to the test and successfully recovered both of their FFUs. It is now an eager moment for us in the MUSCAT team to take part of the experiences and results the RAIN team collected during their launch campaign.

Please enjoy this video and visit for more info about RAIN.

Ejection System almost ready

Hej, last week we received the lower cross of the ejection system. Now the ejection system is almost complete! Once we will receive the rocket cylinder we will start doing some ejection tests.

Enjoy these pics!

FFU Pictures



Enjoy these photos!

Take care,


Things are happening!

Hi you!

There is a lot going on, our manufacturing process is almost over, we have got test procedures almost ready for tests and RAIN is hopefully going to be launched soon. Check out their blog at

I was going to take more pictures of the FFU components we have already with my phone today but unfortunately my phone had no memory and was almost completely uncharged, so tomorrow I will take a camera to do the job and hopefully you will have nice pictures before Thursday.

Take care,


MUSCAT flight hardware

The MUSCAT flight hardware is getting ready and there is not so many parts left to produce. Here you can see some of the latest parts and status of the components of the MUSCAT experiment



This is the pyro-cutter bracket. A newly manufacture steel part to house the pyro-cutters and hold the cable.


This is one of the forks that will keep in place the cable above the hatches.


 This is the flight hardware for the ejection mechanism. I can not get tired of looking at it.


These are the new rib rings that will will use to attach the upper part of the spheres to the lower one.


This is an overview of the main mechanical components of the FFU of the MUSCAT experiment.


These are the composite FFUs laser-cut and they are ready for the final assembly.