One of the major goals of v.3 is to move closer to a production ready version of the steerable recovery system. The newly designed bay has a bunch of improvements that I feel make it much more durable and easier to assemble and fly.
First, I removed the need for a hard to build part of the tube assembly, the c shape coupler section and rails, which prevented the bay from rotating. I decided using a remove before launch pin or screw to keep the bay oriented was preferable. The bay orientation is only necessary so that I can locate the magnetic switch to turn the bay on. This allowed me to replaces the split coupler with a complete section of coupler for the bay to slide in. This change also makes it much less likely the burrito or bay will snag in the tube.
Next, I updated the way I attached the shroud lines to the steering bay. In the previous version the end caps of the bay each had two inline u-bolts, the upper u-bolt on each end attached to the kite with a quicklink, and the lower u-bolt on each end attached via quicklink to the y-harness that went down to the swivel and main shroud. The tension between the upper and lower u-bolts and the spacing between end caps provided for the proper positioning of the bay. This approach had a number of downsides. The force being transmitted from one ubolt to the other through the end cap, the four ubolts and four quicklinks were bulky and heavy, and at deployment the ubolts would need to move into the correct orientation under tension without snagging or damaging anything. I replaced all of that hardware with a single quicklink clamped to each end cap of the bay. All of the recovery forces are now transmitted through the quicklink and the bay is essentially clamped to the shroud line. This fixes all of the problems with the old design and results in a reduced part count. I also have decided to make the connection to the servo lines with a quick-release used for key rings which are plenty strong and are much less bulky than the three 1/8" quicklinks I was using before.
Lastly, I made some changes to the way some components fit together to protect potential weak spots and make assembly more consistent. I added shoulders to the end caps to protect the ends of the coupler tubes from impact. In a previous flight I had one of these tubes break away after it impacted another part of the rocket or hardware edge on. I have also designed tabs and grooves that will key together some of the pieces to help with alignment during assembly, but those changes will not be implemented until I begin CNC cutting the side plates on the next iteration.
I have some additional plans for a future v3.1. Including replacing the stabilization bay with a production version with small changes to allow it to have its own switch and battery (its currently powered by the steering bay), replacing the prototype 808 camera shroud in the nose with a production Mobius Mini shroud, and possibly moving the ejection electronics into the steering bay.
I will post another update after the upcoming flights at MWP.