> the black box valve controllers are going to break off, under any kind of g > load I ran that past John. He said >> The valve motors do tend to break when we crash, but it doesn't cause leaks. Hopefully (!), by the time they get to serious manned flight, crashing will be an extremely unlikely event. In the earlier days, when every aspect was a major learning experience, there were some quite interesting crashes. But none were anywhere as "good" as the disasters of the early US space program. Such events are an essentially mandatory part of any rocket development program. I've seen a video of a 100+ foot long US rocket flying sideways at ground level - gives a whole new (or old) meaning to the HPR term "landshark". And I have a picture of a Trident missile about to complete its second full powered loop at sea level. Presumably it didn't have an armed warhead at the time :-) RM -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.