Scrooge

After trying several times and fail again, I'am quite agree with you. And I am thinking about making parts of the wing to be spoilers... Thank you! I will watch that!

VTOL or Rovers are good but... sorry for my mis-expression...I am thinking about some kind of gliders without using reaction wheels, flying at an extremely low speed about 20-30m/s...

BTW, how to make an aircraft stable at very low speed? (30-20m/s) I see some people managed to do a taxing landing on the roof tarmac with their aircrafts...

Thank you for your guidance! I will take a time to think about your reply !!!

Recently, I start to focus on modifying an aircraft with a CoL far ahead of CoM, that means, the plane wont fly smoothly (of course). To make the plane manually-controllable, I am going to try several methods recommended by some other players to reduce the negative influence of negative stability: 1.Use canards instead of elevons. Since my fetish required fixed position of wings (like F-15 or F-22), I have to arrange the mass to the tail of the aircraft to make CoM behind CoL. However, the original elevons at the rear of wings are too close to the rearranged CoM, thus cause a heavily-reduced controlling torque, which impairs steering and SAS. But the canard has a positive feedback from AoA, a larger AoA will impair the effect of reversely steering canards, Question: How could canards improve the performance of static-unstable aircraft? 2.Use negative feedback of AoA (negative AoA% of control surface) to limit the AoA of aircraft to prevent it from stalling too fast. The negative AoA% actually prevent my aircraft from being stalled, which makes post-stall maneuvers become unavailable. Question: How to set the value of AoA% for different control surfaces for after-stall recovery? 3.Use big and fully vertical (while YF-23 do not use that) tails to strictly limit the instability in yaw. With this kind of setting, even the aircraft goes into stalling, it can be relatively controllable and make it possible to recover speed in some direction, otherwise, the tail spin is unavoidable in most of cases. When I start to try this, I found the side-slipping derivative calculated by FAR dropped a lot after the plane becoming unstable, and the value dropped from about 7m/s^2 to 1.5m/s^2, no matter how I resize and rearrange the position of vertical tails, the value of side-slipping derivative won't exceed 4m/s^2. Question: How to improve the stability in yaw?

Hi! I am a newbie of KSP and I've played this game for 2 hours, and I found this game is awesome for its versatility, I like it! I am a fan of jet planes, especially for all kinds of jet fighters. I really admire Col.John Boyd of U.S. air force, who created the theory of energy maneuverability and change the design methodology of modern fighters. My favorite aircraft is МиГ-31.

got an answer perfectly solve my puzzle. To be honest, I've tried moving CoM backward until the aircraft was nearly static-unstable, but the improvement is limited. I will try reduce angles of every control surfaces, and see how it goes.

Thank you very much!

Canards have positive feedback when AoA is larger so I think it's a good idea. But I am still curious about how this kind of phenomenon occurs, well, maybe it's not because of lift of main wings but the reverse torque given by SAS?

Target: design a highly maneuverable plane with conventional layout (2 vertical and 2 horizontal tails with 2 main wings) FAR: Yes CoM & CoL: the CoM is only a bit forward than CoL, the CoL is within the sphere of CoM Problem: when flying, control the plane to rise its head will cause of trembling (up and down) head. PS: I've already turned off the AoA and pitch SAS given by FAR, but the stock SAS is on. Guess: The torque given by main wings is larger than that given by control-surface when the speed dropping down (which is cause by stalling) Anyone has idea about this? Did someone once encountered this problem? Thanks.