This article is from the Model Rockets FAQ, by Wolfram von Kiparski with numerous contributions by others.
From George Gassaway
>>>>I've got a competition coming up soon with... super-roc
>>>>duration. Any suggestions on what's worked well for you in the
Just remember it's DURATION. So, don't go building something that is
on the edge structurally as is typical in Superroc Altitude, this
event is not typically won by the highest-flying model.
So, more main body diameter for a long length, less smaller diameter
stuff on top. The more of a very small diameter tube you have on top,
the more it can deflect like a canard to either make the model go off
course or simply make it buckle/shred on boost. Just no reason to get
that close to the edge for Duration.
Also it helps to have room to store a decent sized chute. After all
this is not a Superroc event that happens to be timed, it is an
interesting mix of superroc with Parachute Duration. Don't overlook
the Parachute Duration part of it. Well, OK, technically you can use
any recovery system for Superroc Duration but parachute recovery is
the most practical way to go.