Take another look at this aft end drawing of the Hydra. Notice all the points of contact of each pod to the central MMT. The pod pairs have been glued with Titebond II. I am also using Titebond II to attach the pairs to the central MMT. For those epoxy users out there, there has been plenty of discussion on this forum regarding the use of epoxy vs. wood glue in high power construction and surely, this will reignite those discussions among some. But I am of the opinion that if a joint is going to fail or a MMT is going to blow thru on a J or K motor with wood glue because the paper comes apart, the centering rings break or due to some other wood/paper failure, I can't see how it will not happen with epoxy as well. Same applies to these pod joints.
To quote some forum users (if they don't mind) :
troj: We built a rocket using Titebond II, and flew it on a Q motor. The rocket's failure wasn't due to the adhesive used...
kenstarr: Everything for a particular purpose. for wood-wood or paper or porous materials, where shear forces are involved, wood glue is great stuff. (And I'm a huge fan of expoxy). I learned early on a sturdy fin epoxied to a paper tube tears off just as nicely as wood glue.
luke strawwalker: I've SEEN wood/white glue strength EASILY surpass that of the materials it's bonding... once your glue joint is stronger than the paper or wood it's bonding, it's pointless to worry about anything stronger...
cjl: If it's a wood to wood, wood to paper, or paper to paper joint, I'd go with wood glue. Epoxy will work fine, but wood glue will weigh less and work just as well.
Having said all that, I am still considering the TTW attachments of the main fins at the pod/MMT joints with epoxy. Haven't decided, yet.
Since winds here today will be gusting to about 25, we'll probably cancel our local launch so I have a lot that will get done today. My "to do" list is long and full, better get with it. Will post results of today's work with pics later.