Interesting added character on the previous messages? The problem with adding fins to the strap-ons is that it could cause roll strain on the attachment points. Also, I didn't test this design on my Delta X and I don't want to divert too much from what I know already works with securing the strap-ons. I want to get the strap-on booster method tested because I'm planning something much larger in the future. Richard From: kramer@xxxxxxxxxxxx To: roc-chat@xxxxxxxxxxxxx CC: Subject: [roc-chat] Re: Stability: Time to Use the Mojo Date: Thu, 11 Aug 2011 10:23:59 -0700 Why not have the fins on the strap on boosters? Solves many problems that way.... Mike > -------- Original Message -------- > Subject: [roc-chat] Re: Stability: Time to Use the Mojo > From: Richard Dierking <redierking@xxxxxxxxxxx> > Date: Thu, August 11, 2011 8:36 am > To: <roc-chat@xxxxxxxxxxxxx> > > > > > > > Not at all; very good question. I considered this. I wanted to keep the > fin number down to a minimum because the strap-ons are ejected (with pyro > bolts) and I don't want them hitting the fins.  The first six strap-ons > that are ejected are on opposite sides of each fin.  This will leave the > last three airstarted strap-ons centered between the three fins and should > help to provide fin area for the correcting force during the last part of > powered flight. >  > Richard > Date: Wed, 10 Aug 2011 21:01:58 -0700 > Subject: [roc-chat] Re: Stability: Time to Use the Mojo > From: rubr.duky@xxxxxxxxx > To: roc-chat@xxxxxxxxxxxxx > > Silly question... Why not six? > > On Wed, Aug 10, 2011 at 20:46, Richard Dierking <redierking@xxxxxxxxxxx> > wrote: >