You would think it would fit with all these holes.Ah, that makes sense. Does your sled not fit the RRC3 or 2 planform? If there's room there's always drill and tap!
I use Doghouse wiring and love it. The connectors lock and cannot be pulled apart without depressing a release; the wires are different colors for easy color-coding; the way I wire mine, it is impossible to misconnect my wires. Just my 2¢.Ordered 2 ejection charge mount kits from Doghouse and a package of JST connectors from Amazon. I've heard some good things about using JST connectors for wiring and could not justify spending $30 more for Doghouse connectors.
As an avid RRC2/RRC3/RTX user, here's something to note about using a mis-matched set of them if you're intending to use the 3 as a primary and the 2 as a back up. The 3 is usually set for "Deployment Mode 1= Drogue @ apogee, Main at main altitude" as your pirmary electronics with the 2 being relied upon for back up. The 2 can ONLY be set for drogue at apogee +0 or +1.
This means in theory that AT MOST you have 1 second of delay between the primary drogue from the 3 and the back up drogue from the 2. I personally prefer 2-3 seconds between the two intended events, YMMV. In practice, due to processor variations, barometric sensor variations, and software differences between the two that you OFTEN get 1 highly energetic drogue event as both charges fire together.
When I first started flying a 3 primary/2 secondary configuration I had TONS of trouble with this, and knew that it wasn't 'ripple fire' caused by any other factor because I ground tested extensively. Every time that I flew my rocket I had an extremely violent apogee event (more so than anyone else's rocket or any of my other DD rockets), and no one on the ground ever saw a secondary charge puff or heard a secondary report, even though BOTH primary and secondary charges were ignited. This happened the same across 5 flights and extensive ground tests to troubleshoot. I've run across several flyers at different fields who've also had the same issue with a mis matched set, so it's definately not an isolated issue.
I finally contacted Missile Works about my issues, and they passed on the info I've listed above, as they originally designed both the 2 and the 3 with the intent that in a dual redundant scenario that the products would be used as PAIRS of like items, not one of each.
Suggested solution from MW: fly them in MATCHED pairs, with the RRC3 pair having the greatest flexibility for a dual redundant dual deploy set up. Once I went dual RRC3, no issues at all.
I initially planned on using Doghouse's wiring but changed to JST connectors as the connectors added a considerable cost with little benefits. If I encounter issues with the JST connectors I will be returning them and switching to Doghouse.I use Doghouse wiring and love it. The connectors lock and cannot be pulled apart without depressing a release; the wires are different colors for easy color-coding; the way I wire mine, it is impossible to misconnect my wires. Just my 2¢.
Yes, but not without some wiring or programming gymnastics. To me, that introduces another failure mode that's very hard to detect on any visual or preflight check.Wouldn't that mean that I could technically fly the RRC2+ as the main and the RRC3 as the secondary due to it being more programmable?
I don't know what RRC2 you're using, but the RRC2+ has four main altitude settings. 300', 500', 800', and 1000'. There's a DIP switch you toggle to add 200' to the 300' or the 800' setting.Yes, but not without some wiring or programming gymnastics. To me, that introduces another failure mode that's very hard to detect on any visual or preflight check.
You would have to fly the RRC3 in Mode 2, and set your desired drogue delay and the main altitude lower than your RRC2 selection. The RRC2 only allows for 300ft or 800ft for the main, which would make your RRC3 settings 700ft or 200ft. Would that suit your intended flight profile?
Alternately, you could cross wire which unit controlled the main/back-up charges and program accordingly, but you're STILL constrained by the RRC2 settings.
You've already spent so much time and effort on this project so far........I would match units, for a project of this caliber and investment, that would mean dual RRC3s.
Sorry, you're correct on the +200. Haven't messed with setting one in quite a long time and I forgot about that setting since they're in "set it and forget it rockets" and there's no data to download.I don't know what RRC2 you're using, but the RRC2+ has four main altitude settings. 300', 500', 800', and 1000'. There's a DIP switch you toggle to add 200' to the 300' or the 800' setting.
I have at least 5 rockets set up with RRC3's as main and RRC2+'s as +1 second backups. Never had any deploy at the same time. You can still set the RRC3 as the backup for apogee deployment and then as the primary for main deployment, if you want more delay at apogee.
As an aside, can you explain to me the advantage of purpose built ejection charge holders as compared to PVC or copper pipe caps?Received 2 pairs of 3g election charge holder kits from Doghouse. I'm very impressed by the quality of their work
Sometimes typos are a real hoot.Photo #2: Showing the election charge holders...
Oopsy, and I went with these ejection charge holders as they have integrated terminals and I know that they will work perfectly for my rocket. No reason to possibly mess up the ejection charges by attempting to make them myself for the first time. These are very high quality and I look forward to testing them out in flight.As an aside, can you explain to me the advantage of purpose built ejection charge holders as compared to PVC or copper pipe caps?
Sometimes typos are a real hoot.
If you remove the 1 second delay from the RRC2+, does it fire 1 second earlier than the RRC3?Sorry, you're correct on the +200. Haven't messed with setting one in quite a long time and I forgot about that setting since they're in "set it and forget it rockets" and there's no data to download.
Glad that they're working for you in +1 second delay configuration. I have 3 distinct sets that, in ANY combination, will NOT fire with any meaningful delay between the RRC3 MAIN and the RRC2+ MAIN with +1 delay. CONFIRMED by sending them back to Missile Works and having them tested in their vacuum chamber. Multiple build dates on them, too. Obviously the sets that you have are working well for you. Mine are not, documented as such, and it's not just me that's had the same issue.
The fact remains that I was told specifically that they were designed to be used as matched pairs. Not flinging mud, just commenting on my experiences in the field.