Bug #17830
LY-01 Bouncing Issue
20%
Description
I built a plane using the LY-01 Fixed Landing Gear and clicked the "Launch" button, bringing me to the (Dirt Level 1) runway. After the physics initiated, the plane continues to bounce on the runway. In my situation (how I noticed it in the first place) was my plane bounced so high, when landing it blew up the landing gear. I have retested this by building other "planes" and it appears the problem still exists.
The easiest/quickest way to test this is to build a land rover, with the Probodobodyne OKTO, 2 MK0 Liquid Fuel Fuselage, and 4 LY-01 Fixed Landing Gear (picture of Test Rover attached). Click the "Launch" button. Once the physics start, you will notice the rover bouncing on the runway, and it doesn't stop.
It appears the heavier the vehicle, the harder it will bounce, making it impossible to takeoff with a plane.
History
#1
Updated by GarrettMoody over 6 years ago
Updated by I am confident this bug was introduced in 1.4 because I had saved the plane in the picture below in the previous version. Now after downloading 1.4 this is the plane that bounces so high after clicking the "Launch" button that the landing gear blows up.
#2
Updated by Anth12 over 6 years ago
Updated by Interesting...got a quicksave or the craft file?
#3
Updated by GarrettMoody over 6 years ago
- File (Un)manned Plane.craft (Un)manned Plane.craft added
Anth12 wrote:
Interesting...got a quicksave or the craft file?
Here is the .craft file of the second plane. I just tested it again, and after letting it sit (bounce) on the runway for about 5 seconds the landing gear exploded again.
#4
Updated by Anth12 over 6 years ago
- File 1_3_1 (Un)manned Plane.craft 1_3_1 (Un)manned Plane.craft added
- Platform Windows added
Windows 10
Steam KSP 1.3.1
Steam KSP 1.4
Thanks for the supplied craft.
Definitely a problem there.
I recreated the plane in 1.3.1 using the supplied one in 1.4 and tested it first in 1.3.1 and then 1.4.
In 1.3.1 it bounces a few times and recovers
In 1.4 it bounces and bounces and then something explodes.
Oh tested in windows 10
Confirmed...wait wheres the ability to confirm the bug?
#5
Updated by GarrettMoody over 6 years ago
- Status changed from New to Confirmed
- % Done changed from 0 to 10
Setting the status to confirmed per Anth12 request.
#6
Updated by GoSlash27 over 6 years ago
Updated by I can confirm that, and the LY-05 does it too. As a workaround, try setting the damper to about 1.6 for the LY-01 and 2 for the LY-05. That helped in my case.
Best,
-Slashy
#7
Updated by GarrettMoody over 6 years ago
GoSlash27 wrote:
I can confirm that, and the LY-05 does it too. As a workaround, try setting the damper to about 1.6 for the LY-01 and 2 for the LY-05. That helped in my case.
Best,
-Slashy
Thanks for the update Slashy! That definitely does help. I actually set the spring strength to about 0.2 and that completely solved the issue as well. I'm starting to wonder if this is actually a bug or if the developers intended this behavior. I find it odd though that the default settings of spring strength 1 and dampener strength 1 makes the vehicle bounce so much it destroys the landing gear. Regardless, it would appear the spring strength is too sensitive. I will leave it as a bug for now until a developer gets the chance to look at it.
#8
Updated by Squelch over 6 years ago
Updated by 
- Status changed from Confirmed to Investigating
- % Done changed from 10 to 20
- Expansion Core Game added
Thanks for the detailed information. Improvements have been made to wheel and terrain intersection in general, but this has not worked in all cases and some craft are unstable.