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QF9E

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About QF9E

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    Sr. Spacecraft Engineer

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  1. This is PRECIOUSSS, the Perfectly Reasonable yet Extremely Complicated tOrUs-Shaped Space Station. I built it for this forum's Shuttle Challenge. Here's a short video clip of me flying my Shuttle through the ring:
  2. @Brikoleur Your plane is a lot of fun to fly, and it flies quite well! I also like the way it looks, with those big aircraft fins and the nifty colour scheme. I got it to the Island in 1:46, and back to the KSC runway again in about 3:40. I increased the authority limit of all control surfaces in order to be able to pull even more g's and brake even faster, but I could not get a much faster time. The plane has quite large wing surfaces for its weight, so its landing speed is quite low. It seems to float above the runway for a very long time before it wants to settle down, and this takes a
  3. I love your design. However, you may want to check your units: you burn 9778 kg of fuel, which amounts to 1955.6 units. Each unit of fuel has a mass of 5 kg.
  4. Thanks for running the challenge! It re-kindled my love for sim-flying in a way I hadn't thought possible. It's such a good combination of two rather disparate things: going as fast as possible in a straight line while also being able to land somewhat reliably. And all that while flying a contraption that is barely airworthy as it lacks certain parts normally seen as necessary, such as landing gear, a symmetrical wing and / or tail surfaces. Could you upload your Panther craft somewhere? I'd like to give it a go if that's ok with you.
  5. The goal: land a Kerbal on the Mun and bring them back safely to the surface of Kerbin, without ever getting into orbit. More specifically, the PE of your craft must be below zero for the entire duration of the flight. Note: the PE of any orbit in a different SOI from the one your craft is currently in does not count. E.g., during your escape burn from the Mun, the PE of your orbit around Kerbin may be above 0 (else this challenge is impossible), but once you enter Kerbin's SOI, your trajectory must be suborbital. Bonus points of you are able to land at a specific location on the Mun
  6. "There will be no foolish maneuvers or silly parking orbits on this flight" - Professor Snape von Kerman I completed the MUN SRS-1 mission with my Solid Rocket Shuttle. To keep the required number of solid rocket motor stages to a minimum, I flew a highly simplified trajectory: Launch straight up from the KSC at exactly the right time to get on a collision course with the Mun Land on the Mun immediately using a combination of a braking burn and a suicide landing burn Launch more or less straight up from the Mun (this requires a landing on the Mun as far to the right of t
  7. Are command chairs allowed for the underwater part of the mission? E.g., build a mini sub piloted by a Kerbal in a command chair?
  8. I tried yesterday, but I was unable to get my chair copter to fly - even spinning up the blades threatened to lose control. Although I did not use the bigger battery, maybe that provides a more stable landing platform?
  9. Turns out a 6 part craft is possible (2 motors, 2 blades, solar panel, lander can): The reason this works is that with a tail rotor you don't need a vertical stabilizer for yaw stability, as the tail rotor provides yaw control. And the lander can has a built-in battery. And yes, I did manage to make this thing fly without SAS ... for a couple of short hops. I am a newbie when it comes to helicopter design and flying but I flew a precursor to this one (with dual rotor blades on both rotors and proper landing gear) to the Island runway in about 20 minutes, so a total trip time of about
  10. Looking back at my run, I noticed that I use quite a bit of upwards pitch trim during both takeoffs, and find myself having to force the plane into level flight. The solution seems obvious: don't use that much pitch trim during takeoffs. I don't quite see it with the roll control, perhaps you can point to a specific moment in the video? I did increase the roll rate, perhaps I overdid it a bit. And I hope I don't come across as overly critical of your craft. I really like your design, and I enjoy flying it a lot.
  11. I flew it at about 400 m above sea level like I do with my own designs, and I needed quite a bit of downward trim for level flight at that altitude. I am having a bit of trouble with the concept of "too much trim" - in my view you trim as needed for level flight. I tried some more, and I am afraid I don't like the 3000 meter altitude approach. I think you lose a bit of time climbing to that altitude, and top speed is a few m/s lower as well. I also tried the thrust reverser but could not get that to run reliably - I had several craft tumble forward and explode on the runway after I enable
  12. @swjr-swisWhat engine setting did you use on your runs? I've tried your plane and when I run it full throttle all the way it runs out of fuel. When I run it at 70% there's enough fuel but you lose some 20 m/s top speed. I found that your plane has a tendency to crab below 70 m/s or so (probably due to the missing tail fin), which makes landing quite tricky. I found that lining up with the runway at 100 m/s and then gently glide down while incresing pitch trim to keep descent rate acceptable worked quite well. Your plane generates a lot of drag, which is an advantage when trying to slow down fo
  13. With @swjr-swis' tailless craft in mind, during my lunch break I briefly tried my paramotor design without a vertical tail, and it turns out to work fine, albeit with even worse flight characteristics than before: roll stability is almost absent, and it has a tendency to get into an irrecoverable spin at low speeds. However, I did manage to land in one piece, and with some practice I'm confident I could finish the Airfield run with it.
  14. In the same category: a lithobraking maneuver that deliberately destroys an engine on landing a rocket. It changes the speed of the craft like an engine is supposed to do, but in a rather unconventional way.
  15. Thanks, I overlooked the KerbalX link in your earlier post when I first read it. And I agree, all improvised landing gear that I've tried (basically everything with a high impact speed rating) had very bad ground handling, and some of those (the large plate that I added to my Goliath design, for instance) also affects flight quite negatively, especially at high speed.
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