I'm designing an Eve launcher but I'm having problems while testing it on Kerbin. I'm using asparagus staging, with 3 booster groups. 2 with aerospikes and the last one with "LV-909 "Terrier" Liquid Fuel Engine".
But when the half of the first tank gets consumed, the rocket always flips. I don't know what I'm doing wrong, since the COM is always below de middle. Here are some pics that hopefully will help you to understand the problem, as you can see I have tried with diferend pods to make sure it was not a drag problem: http://imgur.com/a/opUs4
Thank you very much, I need to rescue some Kerbals!