[roc-chat] Re: Stability of a rocket with strap-on boosters

Rocksim 9 has tools built-in to model strap-on boosters. If you have Rocksim 7 
or 8, there are ways to trick it into simulating them.

Allen
--------------------------------------------------------------------
Allen H. Farrington
818-653-2284
web: http://www.allenfarrington.org

On Aug 10, 2011, at 11:29 AM, Kurt Gugisberg wrote:

> Richard,
> 
> The strap-ons will add some drag stability (base drag) as well as an area 
> equivalent to fins or a larger airframe area.  Knowing just how to factor 
> that in is the tricky part.  I think you can fudge it into rocsim somehow.
> 
> Kurt
> -----Original Message----- 
> From: Richard Dierking 
> Sent: Aug 10, 2011 10:34 AM 
> To: roc-chat@xxxxxxxxxxxxx 
> Subject: [roc-chat] Stability of a rocket with strap-on boosters 
> 
> I'm considering the size and shape of the 3 fins for my Delta II 7925-10L.  
> It's a 4" core transition to 5" on top with 9 strap-ons, each approximately 
> 1.5" dia (BT-60 tube).  total height is 65".  I don't want it to be a 
> high-velocity rocket and I'll be using a J135 for the core, six F-30's 
> strap-ons 0.5 sec after launch, shed those, then airstart three G's strap-ons 
> then shed the last three strap-ons. 
>  
> For the 3 fins, I'm using 3/16" thick abrasion resistant polycarbonate that 
> by my estimate has a stiffness similar to 1/8" birch.  The fins are 
> through-the-wall and fiberglassed to the 54mm engine mount.  I'm thinking to 
> configure the fins as clipped deltas to avoid busting a tip during landing.  
> Since the rocket has 9 strap-ons, seems to me this would add stability during 
> launch (like tube fins).  Am I wrong thinking this?  I would like to keep the 
> fins on the small size.
>  
> Please advise and thank you,
> Richard Dierking
>  
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