So I'm having slight "issues" with wheels.

[Firemetal]

So. after completing a Duna and back SSTO, I'm ready to attempt a Laythe SSTO. I know you have to have at least 4400+ m/s of DV and I am prepared to have that. I have built a bunch of spaceplanes an some haven't even gotten off the runway. You know why? Because the stupid landing gear always makes me veer to the left or the right. When I try to position it in the middle, it over reacts and veers left or right and stalls. Its not even in the air and it stalls. Here is a picture.

Anyone got any solution to this problem?

Edited July 18, 2016 by Firemetal
Side picture

[Gaarst]

Wheels are bugged.

With some chance, the cause of your problem will be the design of your craft, and it will be fixable. Otherwise, you'll have to do like a lot of us and wait for 1.2.

[Firemetal]

20 minutes ago, Gaarst said:

Wheels are bugged.

With some chance, the cause of your problem will be the design of your craft, and it will be fixable. Otherwise, you'll have to do like a lot of us and wait for 1.2.

Well I knew that. I was just wandering if there was a fix.

Thanks though!

[Gaarst]

Just now, Firemetal said:

Well I knew that. I was just wandering if there was a fix.

Thanks though!

There are no fixes for the wheels right now, but some people claim that tweaking some grip/suspension values or moving the wheels around can make things better. I have tried changing things on some of my designs but I saw no improvement, but your craft is different so giving it a try might be worth it.

[Firemetal]

Just now, Gaarst said:

There are no fixes for the wheels right now, but some people claim that tweaking some grip/suspension values or moving the wheels around can make things better. I have tried changing things on some of my designs but I saw no improvement, but your craft is different so giving it a try might be worth it.

Ok I might. Thanks!

[Wraith977]

@Firemetal Most craft can be altered to work with the new wheel physics. Chances are (and from what I can see) you're making the same mistakes as everyone else - putting your COL too far behind your COM, forcing your front wheel into the ground causing the problems. If you can post an image of the side-view of your craft with COM and COL indicators turned on it would be more helpful.

[Firemetal]

Just now, Wraith977 said:

@Firemetal Most craft can be altered to work with the new wheel physics. Chances are (and from what I can see) you're making the same mistakes as everyone else - putting your COL too far behind your COM, forcing your front wheel into the ground causing the problems. If you can post an image of the side-view of your craft with COM and COL indicators turned on it would be more helpful.

There is a good reason for the COL being that far behind the COM. Thanks to RCS build aid, I can see the dry COM. I want the COL to be behind the dry COM so that when I come back to Kerbin, I won't stall. I know I could move the remaining fuel forwards but there won't be much by that point. But anything you say.

[dafidge9898]

You could try making it a tail dragger, but that may bring up more problems that is solves. Try turning the friction control on the wheels off auto. Increase the main landing gears' friction slightly, and decrease the nosewheel's friction slightly. 

[FyunchClick]

45 minutes ago, Firemetal said:

(...) Its not even in the air and it stalls. Here is a picture. (...)

Wow, those are seriously small wings for a thing that massive. Here's my MK3 SSTO spaceplane:

That's 12 Big-S delta's, and 10 smaller wing parts, plus control surfaces and a set of canards, for a quite similar weight (230-240t). It takes off around 110 m/s, which is good because it'll start to skate around 150 m/s (which may have something to do with the wings which are set at a 5 degree incidence and may be staring to generate lift to the extend that it's causing the rear gear to lose traction which makes KSP think the CoD is now with the front gear?).

Also, what you don't see is the rear gear, which includes a second set of the one-but-largest landing gears placed exactly inline with the largest gear. Without it, it'll start skating around at much lower speeds, presumably because the rear gear is being overloaded which also does weird things for control at speed.

The trick for this takeoff is to pull back hard on the stick at around 90m/s to keep pressure and traction on the rear gear, and then it'll usually take off without incidence.

[foamyesque]

48 minutes ago, Firemetal said:

There is a good reason for the COL being that far behind the COM. Thanks to RCS build aid, I can see the dry COM. I want the COL to be behind the dry COM so that when I come back to Kerbin, I won't stall. I know I could move the remaining fuel forwards but there won't be much by that point. But anything you say.

I'd suggest moving the entire engine nacelle and wing assembly further forward; try to get the NERVS as close as you can manage to the CoM. Maybe move the RAPIERS off the tail and sidemount them on the fuselage with the the NERVS and replace 'em with an adapter fuel tank as well. They'll reduce your CoM shift and allow you to put your liftoff CoL closer to your CoM. It'll also put your rear gear closer to your CoM, which will help with your takeoff pitch up.

 

[Firemetal]

34 minutes ago, FyunchClick said:

Wow, those are seriously small wings for a thing that massive. Here's my MK3 SSTO spaceplane:

That's 12 Big-S delta's, and 10 smaller wing parts, plus control surfaces and a set of canards, for a quite similar weight (230-240t). It takes off around 110 m/s, which is good because it'll start to skate around 150 m/s (which may have something to do with the wings which are set at a 5 degree incidence and may be staring to generate lift to the extend that it's causing the rear gear to lose traction which makes KSP think the CoD is now with the front gear?).

Also, what you don't see is the rear gear, which includes a second set of the one-but-largest landing gears placed exactly inline with the largest gear. Without it, it'll start skating around at much lower speeds, presumably because the rear gear is being overloaded which also does weird things for control at speed.

The trick for this takeoff is to pull back hard on the stick at around 90m/s to keep pressure and traction on the rear gear, and then it'll usually take off without incidence.

I never get to 90 m/s. I always start pointed either to the left or right slightly which I try to fix and the whole thing skids around.

 

 

7 minutes ago, foamyesque said:

I'd suggest moving the entire engine nacelle and wing assembly further forward; try to get the NERVS as close as you can manage to the CoM. Maybe move the RAPIERS off the tail and sidemount them on the fuselage with the the NERVS and replace 'em with an adapter fuel tank as well. They'll reduce your CoM shift and allow you to put your liftoff CoL closer to your CoM. It'll also put your rear gear closer to your CoM, which will help with your takeoff pitch up.

 

That sounds like a great idea!

[bewing]

Try setting the friction on the front gear to 0, and on the rear to 5.

[FyunchClick]

3 hours ago, Firemetal said:

I never get to 90 m/s. I always start pointed either to the left or right slightly which I try to fix and the whole thing skids around.

Hence my suggestion to add additional rear gear. As my ship became heavier, at one point it started skidding and the additional gear fixed that.