On Structural weakness

[Bluejayek]

I went for a minimus landing today with one of my craft. As I had plenty of fuel, I made a very slow descent, and landed at under 1m/s (Approximately 0.4m/s). However, even this landing speed was apparently too much for the attachment points we have in this game, and three of my outer engines broke off on landing.

It seems to me that this is just a tad too weak...

[sal_vager]

I\'ve had better luck landing on engines when I have struts going from somewhere above down to the engine bell, it seems to help, but I haven\'t tested this on Min yet, just Mun and Kerbin.

[sting_auer]

You don\'t seem to be taking the mass of the vehicle into account.

Even at really, really slow speeds like that, your ships still takes a lot of force when the impact because it has so much mass and inertia.

[boolybooly]

Its always been a problem with the larger engines, the small engine is much more robust and is also just small enough for lander legs to work, which is what you are supposed to use for landing! You dont need large engines for landing on the Mün, but you do need them for lifting off from Kerbin, how you reconcile these two truths is your business. ;D