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Wheel suggestions


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I am having this problem where during take-off on completely balanced and symmetrical planes that the ships always want to pull hard to the left.  I am using medium gears with 2 on the back and one on the front.  Once the ship is in the air it's rock stable.

Can someone suggest what to do with the wheels?

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19 hours ago, Bdyer said:

I am having this problem where during take-off on completely balanced and symmetrical planes that the ships always want to pull hard to the left.  I am using medium gears with 2 on the back and one on the front.  Once the ship is in the air it's rock stable.

Can someone suggest what to do with the wheels?

The trick is to prevent the wheels from bending. Put them on the fuselage or as close to the fuselage as possible and then use the translation tool to move them outwards to where you want them. You can use struts to make the wings or the whole plane stiffer.

For example; look at the craft below how I've placed the weels; the weels are actually placed on the wings but they appear to have been placed on the engine nacelles (side pods). This thing is rock-solid under take-off (took me 3 iterations and a lot of time to fix the landing gear issues on that plane, but finally I've got it right... Wheels are seriously broken (bugged) in KSP right now, but it is possible to get it right if you tweak it alot.

 

Also, the center of gravity is important, so you might want to try shifting them forwards or backwards. Finally, try using bigger / heavier landing gears, each landing gear has a certain maximum load after which they will start sliding around the runway.

 

Edited by Chris_2
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I've been using the snap to grid to get the wheel perfectly aligned in the front.  My current ssto craft is 48 tons on the runway and is very solid/doesn't bend.  I havnt tried a heavier wheel base because thats a lot of extra payload.  

Ive experimented with the spring strength and dampen strength and havnt made it work yet

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10 minutes ago, Bdyer said:

I've been using the snap to grid to get the wheel perfectly aligned in the front.  My current ssto craft is 48 tons on the runway and is very solid/doesn't bend.  I havnt tried a heavier wheel base because thats a lot of extra payload.  

Ive experimented with the spring strength and dampen strength and havnt made it work yet

You should be able to turn off angle snap while attaching them, but turn it back on to align them using the translation gadget.

Spring/damper probably won't help much. If they're in a position to be used, the launch is already a failure. I myself managed to get my latest design to take off reliably by switching from three wheels to four. Question for you: When during takeoff do the wheels give out? Immediately after firing the engines, or once you gain speed?

 

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3 hours ago, SingABrightSong said:

You should be able to turn off angle snap while attaching them, but turn it back on to align them using the translation gadget.

Spring/damper probably won't help much. If they're in a position to be used, the launch is already a failure. I myself managed to get my latest design to take off reliably by switching from three wheels to four. Question for you: When during takeoff do the wheels give out? Immediately after firing the engines, or once you gain speed?

 

Once I gain speed 20-30 m/s. When I get close to take off speed ~50m/s and start to pull up (but havnt left the ground yet) everything evens out

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Try setting a customized friction on the front wheel to .4 or below, and on the rear wheels to 1.3 or above. This creates dynamic stability -- low drag in front of the CoM, high drag behind the CoM.

You said you got the front wheel straight, but the rear wheels can sometimes also need straightening -- absolute rotation mode on the rotate gizmo in the editor can straighten them if need be.

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On 01/11/2016 at 3:16 PM, Bdyer said:

I am using medium gears with 2 on the back and one on the front.  Once the ship is in the air it's rock stable.

Can someone suggest what to do with the wheels?

Make sure the rear wheels are as close to CoM as possible without it tipping over. Then it'll be rock solid on the runway, too.

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