Craft bounces+explodes after runway launch

[Z-Key Aerospace]

Using 64 or 32 bit on Windows7/64.  With or without mods.

Launch a small, low tech craft from the runway.  Mk1 pod and 4 materials labs, juno jet and circular intake.  2 fixed landing gear on small wings at back.  Steering, fixed landing gear below first materials lab.  Couple of batteries.  It's not supposed to fly I just wanted to use it as a rover to grab some "landed at Kerbin" science

Any how the craft is jittery right from the outset.  If you leave it it just bounces right off the runway and explodes.

I tried it without the steerable landing gear and just put a wing+fixed landing gear in each corner but it did the same thing.  Tried it in sandbox with a top spec runway but it made no difference.

Here is the craft http://themoose.co.uk/ksp/runway-bounce.png

Edited April 21, 2016 by Z-Key Aerospace
Link to picture