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So I had a little argument with someone about what sort of propellant would be most efficient, volume-wise, in order to get the same spacecraft to LEO. I voted for RP-1, while he voted for LOX/LH2. I can see his point, LH2 has a much higher Isp, but then again, RP-1 is much, much denser... I...

Before you rush and kill me I have to tell you this: I >DID< look around the web, and my different subdirectories inside the SDK directory, and the different sample codes. I just don't seem to find the starting point for developing a new addon. A few questions: What is the addon type that will...

Hi everyone, sorry about the delay... With the recent stupid war that our government decided to jump into it's been kinda hard to find the time to work on the Arrow. However, the war settled in the recent days so I managed to find some relaxed moments to make sure all my calculations were right...

A friend of mine gave me a derivative of the rocket equation to find the amount of fuel needed to achieve a certain Delta-v: Mf=Me*e((Dv/Ve)-1) Where: Mf is the fuel mass Me is the empty mass Dv is the the Delta-v Ve is the exhaust velocity However, when comparing it with the original equation...

Hello everyone :hello: Now that I am quite acquainted with the works behind reentries, I decided that I want to do it "the advanced way": keeping a constant deceleration load instead of a constant descent rate. I also think that it will be more accurate than keeping a constant descent rate, as I...

Angry Birds Space Here's a video that NASA recently uploaded to YouTube: Nice way to teach kids science. Now, don't expect a 3-year old child to recite Newton's Third Law! :lol: Seriously, though, I think this is a very good way to expose millions of young people to physics & space...

Well, here's something that I don't think most of you have done: A full reentry: from deorbit, through EI, to constant drag to the HAC and a perfect landing. There's a catch to it however: all unpowered (except the deorbit burn of course!) and WITHOUT ADDON MFDS >>AT ALL!<< Have you ever done...

Hello everyone! :hello: I want to know, how did the real space shuttle reentry autopilot work? I mean, all of the stages of from preperations, deorbit burn, and the reentry itself. -How did it know the correct place to deorbit? -How did it compute the reentry trajectory? Please spare me from no...

Well I saw that although most (real-life) suborbitals get really fast, they barely go far. How come? And is it possible to extend the range?

Hi everyone :hello: So, the title says it all: what level of programming knowledge do I have to have in order to start developing addons for Orbiter? Just so you know, I know almost nothing at all at programming, I'm only good at modelling. I've started learning C++ recently, but I don't have...

Okay, I'll keep this one short, but I really had to address this problem. So, a short calculation revealed that the RS-68, that produces about 3,370,000 Newtons of thrust, gives me about 350,000 kgf of thrust. That's way too much, considering that I have 2 of these engines on the Arrowhead and...

So I decided to let y'all know that the Arrow System isn't dead - I just don't have the time to devote to actually develop it for now. I have a ton of other things on my head and I don't want to work on several projects simultaneously. First of all, since the system is clearly no more the...

Hello everyone again! :hello: As some of you may know, I am currently working on a project [called 'Arrowhead'], a SSTO. In my endeavor to make the Arrowhead as completely realistic as possible, I decided to take some measures, one of them is trying to get the most realistic aerodynamic data...

Hello everyone! :hello: I have recently started studying the space shuttle's systems closely for the ssake of developing my own add-on, and stumbled upon this great article, describing the SSMEs and their way of operation. Now, it mentioned in some points the use of Helium in the space shuttle...

Hello everyone :hello: I don't know how many of you here use X-Plane, but I wanted to ask you something: Does the Orbiter SDK support manipulators, ? Essentially, what manipulators do in X-Plane is making every grab-able object grab-able inside the simulator (at least the ones that have defined...

Hi all! :hello: I wanted to share with you some remarkable achievment of mine (well, sort of :facepalm:) So I decided that after knowing orbital insertions, ISS docks and even lunar transfers-it was time for me to go 'hardcore': trying a re-entry. So, I used the DGIV with the 'docked to ISS'...

Heyos there! :hello: The question is, can I integrate free-roaming into the VC of my addon (yeah, I hope that's the right place to ask! :P), like the way X-Plane's VC's work? ~Thanks in advance, Oz.! :)

Hello everyone! I have a first screenshot of my so-far progress. Ignore the tube overhead, it is a remnant of my previous try at modelling the interior, I decided to go for another technique, which meant re-skinnig the entire cabin! That is the reason why the cabin doesn't fully fit the...

Hello everyone! I have started the process of making a new vessel, named ArrowHead. You'll understand why that's the name as I will start to publish screenshots. But for now, I am only beginning the work over the model, and later on I will start looking on various parameters so I'd better...

Hello everyone. After doing a couple of successful lunar transfers, next stage for me is reentries. But when I try to do a reentry, no matter with what vehicle, I keep bouncing off of the atmosphere at about 65km. I have tried everything, including autopilots, and yet no success. Please Help me...