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Jamie Logan

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  1. Good question. It is, but only if the control point on the lander can is set to "up" instead of "forward". Unfortunately, doing this will flip the yaw/roll axes and the SAS seems to just freak out. Maybe there's a way around this?
  2. Hey everyone! Today, I've got another replica to show off! Red Bull Stratos was a high altitude diving project involving Austrian skydiver Felix Baumgartner. On 14 October 2012, Baumgartner flew approximately 39 kilometres (24 mi) into the stratosphere over New Mexico, United States, in a helium balloon before free falling in a pressure suit and then parachuting to Earth. The total jump, from leaving the capsule to landing on the ground, lasted approximately ten minutes. While the free fall was initially expected to last between five and six minutes, Baumgartner deployed his parachute after 4 minutes and 19 seconds. Reaching 1,357.64 km/h (843.6 mph)—Mach 1.25—Baumgartner broke the sound barrier on his descent, becoming the first human to do so without any form of engine power. Measurements show Baumgartner also broke two other world records. With a final altitude of 38,969 m (127,851 ft; 24 mi), Baumgartner broke the unofficial record for the highest manned balloon flight of 37,640 m (123,491 ft) previously set by Nick Piantanida. He also broke the record for the highest altitude jump, set in 1960 by USAF Colonel Joseph Kittinger, who was Baumgartner's mentor and capsule communicator at mission control. (from Wikipedia) My replica utilizes some tricks to make the balloon work, since stock buoyancy isn't a thing (yet). The "balloon" section is made mostly of fairings, except for the midsection which uses the structural tube parts to make for an internal section where aerodynamic forces aren't ignored (like they are inside fairings). Inside those tubes are two counter-rotating sets of propellers which will provide our lift to simulate buoyancy. The rotors are powered by fuel cells which are fed by a single small tank with enough gas to get you a few kilometers up before the jump. Craft File: https://kerbalx.com/Jamie_Logan/Red-Bull-Stratos When flying: Set your SAS to radial out, press action group 1 to power up the rotors and fuel cells, then throttle up to 100% and stage. EVA and hit spacebar once you reach ~9 km. Don't forget to open your parachute. Enjoy! Gallery: I hope you liked it! Here is my last post:
  3. The first in my musical instrument series. If someone wants to build a launch vehicle for this puppy, I'd love to see it! " Makin’ my way downtown, flyin’ fast, planets pass and I’m homebound " - Vanessa Kerman, 2002 Poor Jeb's little arms and legs cannot reach the keys and pedals. Craft file (MIDI file??): https://kerbalx.com/Jamie_Logan/Grand-Piano Anyhoo, Here is my last creation:
  4. Thanks for the tip, I'll give it a try with this vessel.
  5. Hello! Today, I've got a new toy. Everyone has made a basic orbiter with command module return capabilities, usually using the trusty ol' heat shield and parachutes, but I decided to try to build an orbiter that can land using a set of extendable wings, much like one of the proposals for the Gemini Program: Introducing the Mallard CSM-W: The Mallard CSM-W is a standard LKO crew module. The launch vehicle can place the orbiter into an equatorial LKO, and the orbiter has a few hundred m/s of on-orbit maneuvering fuel. The orbiter also comes with RCS thrusters, fuel, and a forward mounted port to allow for rendezvous and docking. The service bay behind the command module has two sets of wings with landing gear folded in at launch, which can be deployed prior to de-orbit and re-entry. Upon re-entry, an initial angle of attack of 90 deg will allow you to bleed off enough speed to keep temperatures low once you reach the lower atmosphere. Once you kill the majority of your speed, you'll need to look to land quickly since the lift-to-drag ratio is pretty poor. I've found it to be easiest to simply dive down to maintain airspeed, and then level off just before you reach the ground. Landing works best around 60 m/s, as it's decently slow but still above the stall speed. It can be landed on the KSC runway, or really anywhere else with sufficiently flat ground. Dumping the remainder of your maneuvering fuel before landing is also recommended. Action groups: AG1) Toggle lock on all robotics parts (locked by default at launch) AG2) Deploy wings and gear When deploying the wings, first use AG1 to unlock the robotics, then use AG2 to deploy. Once the wings are deployed, use AG1 again to re-lock the robotics parts. This is critical, as the wing parts are autostrutted to the command module, and will be unstable if not re-locked. Due to what I assume to be a bug, re-locking the robotics parts does not always work for all of them (usually the tiny hinges) so you'll have to check all 12 of them to be sure they are re-locked before re-entry. The game will display the "Cannot Lock Robotic part, Servo is moving" warning, even though none of them are still moving after being deployed. Not sure why this happens, but manually locking the rest of the parts does not take long. Here is a lovely gif of the wing deployment in action: https://i.imgur.com/257oimq.gifv Craft file: https://kerbalx.com/Jamie_Logan/Mallard-CSM-W Gallery: I hope you enjoyed it! Here is my last post:
  6. Hey! Recently, I've been messing around with using Ion engines powered by fuel cells. As it happens, the combined ISP of ion engines powered exclusively by fuel cells is a pretty respectable 1293 seconds. One large fuel cell can power two ion engines, so I built an all-purpose crew vehicle that uses 16 large fuel cells and 32 ion engines, allowing all 32 of them to be run at full throttle for as long as one's heart desires, and at any distance or occlusion to the Sun. It also comes with RCS thrusters and a forward mounted docking port. The command module has the standard decoupler, heatshield, and parachutes for return. When placed in LKO using its launch vehicle, it has 4,100+ m/s of delta-v (vac) and an initial Kerbin TWR of 0.25. When flying, keep in mind that the delta-v value that KSP will display on your staging diagram will be less than your true delta-v, because the game does not factor the consumption of lf/ox into the calculation. The ratio of rate of xenon to liquid fuel consumption is roughly 50.08, so the orbiter has 22,800 xenon to 450 lf (ratio of 50.66). This means that all three fuel levels stay roughly equal as a percentage of their initial value throughout the duration of the mission. Because the Ion + fuel cell combined specific impulse is 1293 s, you can estimate your remaining delta-v in m/s at any point using this formula: Delta-v = 9.81 * 1293 * ln ( m / 18.851 ) where "m" is your current mass in t. The launch vehicle comes with the standard launch escape system (LES), with action groups: ABORT: activate LES, separate command pod AG1: activate LES, separate LES (use prior to orbital insertion, or shortly after abort) AG2: toggle fuel cells AG3: deploy parachutes Craft file: https://kerbalx.com/Jamie_Logan/Ranger-FCI-13 Gallery: Hope you liked it! Check this out:
  7. Brilliant! The solar panel/radiator/mining rig looks just like one I made a while ago
  8. Hey Y'all! Many past players have used all sorts of means to simulate airships in KSP, from jet engines to control surface spamming to landing gear glitches and even awesome mods like HooliganLabs. Since the game will calculate lift on an aerodynamic body regardless of how it's occluded (unless it's inside a fairing/cargo bay), we can build a helicopter that sure looks a whole heck of a lot like an airship using the new DLC parts. To this end, I've got another entry into the stock airship category: The Kindenburg utilizes two R7000 Turboshaft engines with 16 medium helicopter blades each, mounted to counter-rotate inside the wing-only section of the envelope. Outside the envelope along the sides, there are two electric rotors with duct blades which will provide our forward thrust. The lift engines are fed by liquid fuel and intake air, while the rotors and reaction wheels are run by the lift engine alternators along with a pair of fuel cells. The crew capacity is 10: 2 in the lander can, and 8 in the upside-down modules. Hanging the passenger modules upside-down was mainly for aesthetic reasons, as I found it to be the best and easiest way to make a good looking passenger module for an airship. I hear bats love to travel in this thing. Action Groups: AG1) Toggle lift engines power and fuel cells AG2) Toggle forward engines AG3) Toggle ladder Flying the thing can be a little tricky. The lift engines are mapped to the main throttle via RPM limit, and a throttle level of 1/2 corresponds to roughly neutral buoyancy. When taking off, it's best to do so with a little forward velocity for stability. Start out by hitting AG1 and releasing the breaks, then hit AG2 to start moving forward. Set your autopilot to prograde lock. Once you pick up speed, throttle up to ~1/2 thrust and you'll be off the ground. Don't try to gain altitude too quickly, otherwise you'll pitch up too far, flip out, and crash. Keep your nose close to the horizon and rely primarily on yaw for steering, bumping the throttle up and down from neutral buoyancy for pitch. Yaw works better for steering while at low speeds, but at higher speeds rolling is preferable. I've gotten it up to ~60 m/s at sea level, but you can probably push it beyond this. When landing, shut off the forward engines and deploy the gear. The massive drag of the fairings will slow you down, so drop the throttle slightly to descend and touchdown, then reapply the breaks. Craft file: https://kerbalx.com/Jamie_Logan/Kindenburg Gallery: OH THE HUMANITY!!!!!!!!! I hope you enjoyed this, please check out my last post too (also an unconventional vehicle novelty):
  9. Howdy, Y'all. Way back in ye old days of 2013 KSP, a younger and perhaps less-skilled me tried his hand at building a steam locomotive replica. This was the result: Not too shabby, given the limited part repository at the time. Though I've seen many KSP players build fantastic train replicas, I had yet to come across one that utilized the new stock robotics parts to make working running gear. So, I set out to overhaul Jeb's once-mighty steamer with the latest in Kerbal engineering technology: Jeb's Locomotive was designed to function in a similar fashion as typical modern locomotive replicas do; the running gear is powered by the drive wheels which are in turn powered by electric motors, instead of steam power driving the running gear and subsequently driving the wheels. The 6 rover wheels only provide brakes and steering, while the 6 rotor wheels are coupled in axle pairs using standard docking ports to provide side-to-side consistency in operation. The running gear is largely coupled together using junior docking ports. Engine power is controlled using the KAL controller in the cab. Press action group 1 to engage the drive motors and start up the fuel cells, set the controller to play until you reach your desired speed, then pause it. The play speed is set slow intentionally, as sometimes sudden changes to the RPM can mess up the running gear synchronicity. Unfortunately, the engine plates used to make the drive wheels don't have great traction with the ground (leading to slight slipping), and collision tolerances will limit your top speed to <9 m/s (as you will see shortly). You can of course go faster by disabling crash damage on the debug menu, but beware that at higher speeds the running gear can easily go out of whack. I find it runs quite nicely around 6-7 m/s surface speed. You are welcome to download and add on things like coal cars, passenger cars, etc. if you'd like. The locomotive is already 218 parts as-is, so expect lag if you're planning on adding a lot to it. If anything, download it just to drive it up to 9 m/s, for funzies. The entire vessel is Stock + DLC. Download: https://kerbalx.com/Jamie_Logan/Jebs-Locomotive Here is a gif of the running gear in motion at a slow speed: https://i.imgur.com/bHYKT1b.gifv Gallery: I'M GOIN' OFF THE RAILS ON A... oh nevermind. I hope you liked it! Check out my last build too:
  10. Hello, everyone! Recently, I took a break from my usual space-faring missions to build a new VTOL dropship. The Hummingbyrd VTOL has four Panther engines which are mounted on hinges that allow the aircraft to alternate between VTOL and forward flight postures. The decision to use Panther engines was made because of their ability to make instantaneous thrust changes via the afterburners, which helps tremendously when landing. The engine housings use two sets of small internal docking ports with one of each offset to the other engine to allow for each set of engines to remain coupled despite no actual axle passing through the engine mount. The downward-facing payload bay contains an extendable crew bench, allowing for quick on-loading and off-loading of passengers. The crew capacity is 10: two pilot seats and 8 seats in the payload bay. The vessel is 119 parts. Notice the highlighted docking port in the far engine housing, as well as the corresponding un-highlighted port in the near housing. Both are attached to the opposite engine housing, but remain docked to the non-offset port in the same engine housing. This prevents flight/aerodynamic forces from causing asynchronous engine rotation, leading to unbalanced thrust and instability. Shown above is the center of thrust, mass, and lift placement while in VTOL mode. While in this posture, all three are collinear in the dorsal-ventral axis. All tanks with fuel in them are laid out with symmetry front-to-back, allowing the C.O.M. to remain stationary regardless of fuel levels. This is critical for VTOL operations, as any significant deviation of the C.O.M. from the net thrust vector will cause a persistent pitch bias. Shown below is the center of thrust, mass, and lift placement while in forward flight mode. While in this posture, the C.O.M. is offset forward of the center of lift due to the redistribution of engine mass, leading to improved stability while in forward flight. The rear engine set is offset above the longitudinal axis to the same extent that the forward engine set is offset below, allowing the net thrust vector to remain in line with the C.O.M. Action Groups: AG1) Toggle engine orientation AG2) Toggle afterburners AG3) Toggle landing gear AG4) Toggle payload bay doors and piston lock AG5) Toggle piston extension Gallery: I hope you liked it! This ship is a joy to fly, and I highly recommend you try it out! Craft file: https://kerbalx.com/Jamie_Logan/Hummingbyrd Also, Check out my last mission:
  11. I'm all about those THICC ships Here's some of my recent stuff:
  12. Hey everyone! This one's so wild, it'll make your head spin! Most of us have tried our hand at building an artificial gravity station, either by building a conventional orbital station with a working centrifuge, or even building an entire spinning 2001-style vessel. Both are wonderful, but what if your Kerbals are going to be spending months on end not in zero gee, but on the surface of a body with a surface gravity less than that of Kerbin, like Moho (g = 2.7 m/s^2)? We can still put a centrifuge to work, but this time it'll be there to provide the additional acceleration that we need in combination with Moho's surface graviy to obtain a 9.81 m/s^2 net acceleration on our Kerbals, ensuring the long term health of their little (presumably) green musculoskeletal systems. To this end, I've developed the Rototron XVI. An artificial gravity surface base with the capability of reaching Moho with a crew of 32 Kerbals. When deployed on the surface, the centrifuge can be run indefinitely due to the combined ISRU refinery and fuel cell array. The station is constructed in LKO via two separate launches; one for the centrifuge and crew cabins, and another for the main engines and landing support structure. The crew of 32 is launched separately, along with an additional fuel tank that will be used to provide the rest of the delta-v we'll need to make the interplanetary transfer to Moho. A region near Moho's south pole was chosen as our landing site due to the abundance of low-altitude flat land, as the axis of rotation of the centrifuge must be as close to parallel to the local gravity field as possible to sustain constant acceleration. From left to right: R-XVI Centrifuge, R-XVI Crew Module, and R-XVI Landing Support Structure, Here is a link to a gif of it under rotation, KSP forums wont let me post it here https://i.imgur.com/jEbFkj3.gifv The math on this is not terribly difficult. Typically, when constructing an artificial gravity station with the intention of simulating actual 1 gee acceleration, you work out the necessary rate of rotation via: angular velocity = sqrt ( 9.81 / r ) Where "r" is the perpendicular distance between the crew cabin and the axis of rotation. In our case, if we model the two crew cabins as point masses on the ends of massless rods under rotation in a uniform gravitational field, the acceleration experienced by the crew cabins can be evaluated merely as a function of the angle of splay of the crew cabins while under rotation (such as with a centrifugal governor). Thus, we need only calculate the angle of splay that will result from our desired total acceleration: Splay angle = arcsin( 2.7 / 9.81) = ~16 deg Knowing this, we simply vary the rpm on the main rotor while monitoring the angle display on one of the hinges until the splay angle settles in around 16 deg. Now, we see the launch, construction, landing, and operation: Again, here's another gif: https://i.imgur.com/MPMPMY2.gifv I hope you enjoyed this, I sure enjoyed building and flying it. I don't have plans to post the craft files yet, but I will if it seems like there's enough interest. If you like crazy big spacecraft, you'll also like my last post:
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