A great blog post here, on the effects of residual propellants and how it affects the performance of a rocket.
Residual propellants have always been something I have known and read about but never really looked into the effects off. This could be worth investigating for any of the FAR-MARS prize participants, but this would depend on the flight profile in order to hit the 45kft.
At this scale, one could burn to overshoot the mark and use drag brakes and real-time processing to hit the required altitude, as an example. Those burning to depletion and hoping for the best, this may be something to consider, this could easily also be estimated for sims by conducting an all up stack test and weighing the rocket after burnout.
Anyhow, the post is worth a read regardless.
Are you a participant in the prize? I’d be keen to know how exactly you plan to hit the 45kft altitude!
I think this is relevant as alot of topics/groups I cover are University based.
Kingston University are offering a fully funded research opportunity in rocket propulsion, check out the link!
BTW you need to email for an application form before July 7th!
From the Spaceport America Cup website,
The Spaceport America Cup is designed around IREC – the Intercollegiate Rocket Engineering Competition for student rocketry teams from all over the country and around the world. With over 110 teams from colleges and universities in eleven countries, 2017 will be the competition’s biggest year yet. Students will be launching solid, liquid, and hybrid rockets to target altitudes of 10,000 and 30,000 feet.
Video Caption: The Experimental Sounding Rocket Association and the Spaceport America Crew will host and support the world’s largest University rocket engineering competition on the vertical and horizontal launch campuses at Spaceport America on June 22-24, 2017.
As the university year draws to an end, this only means one thing, end of year exams. So I apologise in advance if post and news are sparse over the next month, if I do post a lot it is most likely me procrastinating!
In other news, I recently represented the University of Canterbury in this years Warman Design and Build competition, this competition is open to universities from New Zealand, Australia and Malaysia and is aimed at mechanical and mechatronic engineering students.
We had to come up with a system that would transverse between two tables, suspended on a bar and finish in a set finish box on the other side.
We won our campus rounds but unfortunately were only able to place 4th at the main competition in Sydney, it all came down to time as you will see in the video below, we were only able to manage 7sec. 1st-Monash (Melbourne) (5sec), 2nd-University of Newcastle(6sec) and 3rd-RMIT(6.5sec) all placed ahead of us, although it came down to 0.2 points between us and RMIT for 3rd!
Here is our “Atlas pipe crawler” in the warmup rounds.
Our limiting factor in reducing our time was our main actuator, we just could not get enough voltage to it to have it extend faster, this meant we were running our drive motors at 70% out of the box as not to get to the bar too fast and have to wait, you can see at the end they are up to 100% when we leave the actuator behind. Our original idea for a tracked system was to easily transverse the bump strips and have the most direct line, but now seeing others easily take them with normal wheels makes me wonder if we could not have gained more speed there and by going to a 4wd system.
In all, it was a great experience, chewed up a lot of my spare time, and opened my mind on how there are many ways to achieve one task.
I have previously posted about Scott Manley’s informative videos explaining more in depth information about rockets for Kerbel Space Program players. Looking into the physics and more engineering design, these videos are a good watch for anyone wanting to get to know rockets more.
This week Scott talks about rocket engine plumbing and engine cycles.
Video Caption: After talking about the things that Kerbal Space Program can teach you about rocket science I wanted to do a series about things that KSP doesn’t really teach you, starting out with rocket nozzle design.
A nice video from Scott Manley introducing rocket nozzle theory and designs for those that play Kerbal Space Program (I myself like to dabble in this game!). A good video to show those how your rocket engine actually works!
For those that do not know, Scott describes himself in his Twitter profile as a Hacker, DJ, Astronomer, Dad, Scotsman, Capulseer. Makes videos about science and video games…at the same time!
His Youtube channel is definitely worth checking out, especially if you are starting out with KSP, his knowledge not only of the games but also the science behind and in it all make for some compelling videos, even if you are not interested in the games.