Random Flying Object
Well-Known Member
- Joined
- Jan 26, 2013
- Messages
- 455
- Reaction score
- 12
Most impressive!
Later!
--Coop
Thank you.
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Most impressive!
Later!
--Coop
Wow how did I miss this one. This is how I plan on doing my L3, good on you for doing something, risky but calculated and interesting. The tee nuts are something I would pick up if you ever plan on selling them. Also what servos are you using for the canards and I am assuming you will have a 2D or 3D axis controller, if so will you be running in 2D just for yaw and pitch or 3D including roll?
I made a few hundred Tee nuts/counter sink washer pairs and then treated them so they would stick to epoxy, figured I would see how others liked them. I am using Hitec HS-5485HB servos with a bit of gear reduction, all from Servo City. Eventually I will run 3D control, that will come later. I need to get the rocket flying nice a stable before trying the active control. Using a pair of SCC1300 gyro's for the primary stabilization feedback.
View attachment 175240
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I don't have much to add, but WOW, I'm intrigued! Found this looking to see what others have done with RJ45 jacks on rockets, as I have a few, and am struggling fitting all my JST-type connectors in my av-bay. Want to rewire with 2 RJ45, and now have the confidence that it will work!
Looks like yours, Random Flying Object, are going to be exposed to BP charge, or am I misreading the photo of your av bay bulkheads?
No, my RJ45's are not exposed to a BP charge.
Getting closer. Nearly time to start populating the AV bays and installing the recovery system.
View attachment 177209
View attachment 177210
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Epoxied the glass to fill in all the small imperfections and fillet the tee nut inserts. I was very pleased with the result.
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That does look nice! What kind of epoxy did you use?
And did you pass the test (or rather, did you get any of the questions wrong)?
Jim
I gotta ask, what's the KitchenAid stand mixer used for?
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I can't recall reading the specifics on the usage of the breakaway wiring harness and how it will work, can you expand on this?
That's not an AV bay, that's a work of art! Gosh I love working with fiberglass. Looking awesome!
-Ken
The harness in the picture runs between the aft AV bay and the forward AV bay, in the annular space next to the recover tube. The recovery tube is a 4" tube containing the drogue and main parachutes, it is housed within the 5" main body tube. The bulkheads for the two AV bays sit on each end of the recovery tube. When the main tube separates, causing the recovery tube to separate, the harness must breakaway from the aft bulkhead to allow full separation and chute deployment.
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Are these the same bulkheads with the RJ45 jacks, if so are you removing the lock tabs, if so how are you mitigating the cable from popping out?
The RJ45's connected to the forward bulkhead have tabs and click in to place as usual. During acceleration the cable harness is pulled down and the tabs have stress on them.
The RJ45's connected to the aft bulkhead have the tabs removed. The connector has a good friction fit and requires a bit of force to disconnect. This connection can be broken by heavy deceleration or separation for chute deployment. The connectors do not spontaneously pop out, the friction fit seems good enough to maintain the connection. It is possible that extreme vibration could cause an issue. Hence this connection is only used for non critical data acquisition during flight and for ground support on the pad.
Hope that clears it up.
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What type of disconnect are you using for the retract system at the pad. I assume you will have a air tank at the pad to hold pressure to the retract cylinder. Most retract systems I have worked with have a turn lock system.
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