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Do your wings have elevons on? If not, be sure to attach them, then pull your wings slightly forward so your centre of lift is inside, but slightly further behind the centre of mass.
Does that explain why it bounces on the Runway? Also, the rear wheels, not sure what they're called, are quite long and may not be leveled with the front steering wheel. Is that the problem?
No I mean bounces on the runway when stationary, directly after spawn. Even with the brakes on it just bounces like crazy. As I start the engine and increase throttle it just face plants and explodes :D
1) I think the front wheel is not aligned with the back wheels, the front one looks to be higher. When the plane spawns on the runway, it is slightly dropped from the air. If you have improperly aligned wheels at different heights, then this bouncing is more pronounced. You should also rotate the back wheels so that they actually touch the ground at a 90 degrees angle. Did you see how those wheels look? Image those wheels and how they look on a real car/plane/ whatever.
2) Don't use the level 1 runway. It sucks, just steer left or right and take off from the grass. The level 1 runway has many bumps that can affect your take off.
3) Add some wings in the front of the plane if you have significant issues taking off. That same wing type that you used as tail fin can be used as canard in the front of the plane. Obviously you'd have to adjust your center of mass and its alignment with the center of lift afterwards.
4) Don't add a very big amount of fuel. For example, 800 units of fuel on a plane with 2 Juno engines can get you at least halfway around the planet. If you add a very big amount of fuel you might not be able to take off properly. This wasn't it in your case, because you had a Swivel or Reliant engine.
P.S.: By the way, I didn't see the SAS activated in your screenshots! Dude, press T and activate SAS before every launch!
http://steamcommunity.com/sharedfiles/filedetails/?id=842235301
My runway has a hole in it..
http://steamcommunity.com/sharedfiles/filedetails/?id=842866919
Literally.
While others have pointed some of these out already, still:
- Rocket engines + rocket fuel tanks are just too heavy for the landing gears you are using. They are likely to get overstressed and explode, if not right on vessel load, then when you start accelerating.
- Too much vweight on a wheel can result in uncontrolled oscillation/bouncing. You can offset that somewhat by experimenting with the spring and dampener values in the right click menu of the wheel.
- The "CoL should be aligned with CoM" rule you find in airplane building guides doesn't always apply. In fact, I found that most planes fly stable when the CoL is set to... wherever it needs to be set for that specific design, which can be pretty much anywhere. The only way I found to find the right spot is trial and error, adjust it in tiny steps by moving lifting surfaces around and test the plane until you find the position/configuration that actually works for that specific one.
- Wheel physics are still bugged, especially when using the smaller wheels. I've gotten wheels randomly doing all sorts of stupid things on airplanes which other times were behaving as expected.
- The starting runway is useless, it's so bumpy that it'll cause smaller wheels to overstress and explode. Even if that doesn't happen, all the bouncing your plane will do while trying to gain speed will likely destabilize it to the point where it becomes uncontrollable and crash. Just roll off the runway to the left, move away a little, then point towards 90 deg (same heading as the runway) and take off from there. Do the same for landing too, don't use the runway, it's near impossible to keep a plane intact.
- SAS can sometimes be more hindrance than help. Depending on the plane design, sometimes having it turned on will actually prevent the plane from taking off, as SAS will do its best to keep it on the ground (thinking that's the desired stable position it needs to maintain) until it explodes. Other times, if the plane has enough starting AoA to overcome SAS, it'll "panic" when sensing that the plane started tilting up and immediately faceplants it into the ground. You have to experiment with SAS both turned off and on with each plane design to see which case is it for that specific plane. Once you are in the air, no part of the plane is touching the ground and you have a positive RoC, SAS behaves better and should be safe to turn on even in cases where it would sabotage the takeoff.
RoofcatA may be correct about the weight, but I think I was able to launch a very similar craft. The bouncing on spawn is normal, but it shouldnt destroy your craft. So, remove a bit of fuel to take the weight down.
http://steamcommunity.com/sharedfiles/filedetails/?id=840322079
http://steamcommunity.com/sharedfiles/filedetails/?id=840322233
you need to make your plane v light using just the basic engine in the first picture note:
1. the two central tanks are empty
2. how the centre of lift is just behind the centre of mass
3. i have put 2x2 small liquid full size 0 fuel tanks full on the end of each wing
4. i have put a small air intake also on each wing
5. the tail fin only controls yaw, the outer flap roll and pitch and inner flap just pitch
edit if the runway is too bumpy it is worth it driveing slowly off and using the grass
http://steamcommunity.com/sharedfiles/filedetails/?id=840327442