...Seems way more than necessary if those are rivets. ...
Quote from: dorkmo on 05/07/2018 03:43 amwhat do you guys make of this? it looks like some sort of stiffing piece attached to the outside of the main leg structure. is that metal or just more carbon fiber? are those rivets?Sure look like rivets. Looks too small for trying to affect airflow.So if they are rivets, then it must be a way to attached a metal piece to a composite one?
what do you guys make of this? it looks like some sort of stiffing piece attached to the outside of the main leg structure. is that metal or just more carbon fiber? are those rivets?
...My guess is vortex generation, but usually there are dimples not bumps.
Quote from: zhangmdev on 05/07/2018 12:04 pm...My guess is vortex generation, but usually there are dimples not bumps. Agree, I gues they are turbulators at the trailing edge of the unfolded leg to mitigate laminar airflow during stage decelaration and landing.
"Run as fast as you can, carefully"
I just wanted to compliment SpaceX on the way they have handled this current "glitch" in the static fire. I am putting it here because it seems to be another example of how hard they have worked to make the new block 5 something special. It seems their whole philosophy of operation is somehow complimentary to Blue Origin's "Step by step, ferociously". SpaceX's would be something like "Run as fast as you can, carefully". They seem to have learned from the prior failures, and, looking towards crewed flights on the block 5, check everything conceivable. They take full advantage of the more powerful computational/sensor landscape available to identify issues and resolve them. May they never get complacent.
Quote from: robert_d on 05/07/2018 02:51 pmI just wanted to compliment SpaceX on the way they have handled this current "glitch" in the static fire. I am putting it here because it seems to be another example of how hard they have worked to make the new block 5 something special. It seems their whole philosophy of operation is somehow complimentary to Blue Origin's "Step by step, ferociously". SpaceX's would be something like "Run as fast as you can, carefully". They seem to have learned from the prior failures, and, looking towards crewed flights on the block 5, check everything conceivable. They take full advantage of the more powerful computational/sensor landscape available to identify issues and resolve them. May they never get complacent. Why is this any different than any other vehicle or contractors? This is nothing out of the ordinary.
Quote from: robert_d on 05/07/2018 02:51 pm"Run as fast as you can, carefully"Made my morning! >
Why is this any different than any other vehicle or contractors? This is nothing out of the ordinary.
Quote from: Jim on 05/07/2018 06:07 pmWhy is this any different than any other vehicle or contractors? This is nothing out of the ordinary.What is different and out of the ordinary is the apparent ability to maintain a high level of prudence-caution while also maintaining a high level of change-innovation.
I’m pretty sure those are rivets connecting the carbon fiber leg “fairing” to a stiffener made out of another material. This would run from hinge point down to contact point.
Theoretically, all composites could be adhesively bonded. However, many manufacturers avoid adhesive bonds where joints undergo large amounts of stress; thus, fasteners are still specified for many joints. Also, some structures and components are so large that they preclude the use of the special lay-up tooling and curing equipment needed for most adhesive applications, making fasteners cost-effective for such cases.
Quote from: RDMM2081 on 05/07/2018 05:21 pmQuote from: robert_d on 05/07/2018 02:51 pm"Run as fast as you can, carefully"Made my morning! >Mine too! BTW,"Quantum potes fugere sedulo"Anyone want to design them a crest?
Quote from: Johnnyhinbos on 05/07/2018 03:41 pmI’m pretty sure those are rivets connecting the carbon fiber leg “fairing” to a stiffener made out of another material. This would run from hinge point down to contact point.I'd agree that they're fasteners, but what you're calling a stiffener I'd guess is more like a metal doubler that, along with the fasteners, acts to clamp the two composite pieces (outer and inner faces) of the leg together. Carbon fiber is already so stiff that the leg cross-section should be more than strong enough without stiffeners, and the relative narrowness of that strip, just wide enough to carry the bearing stress of the fastener heads, makes me think it's for that purpose.Probably SpaceX came up with a more efficient manufacturing process for the legs, one that requires some assembly but makes the composite parts easier to fabricate.QuoteTheoretically, all composites could be adhesively bonded. However, many manufacturers avoid adhesive bonds where joints undergo large amounts of stress; thus, fasteners are still specified for many joints. Also, some structures and components are so large that they preclude the use of the special lay-up tooling and curing equipment needed for most adhesive applications, making fasteners cost-effective for such cases.http://www.machinedesign.com/basics-design/joining-composites
Quote from: docmordrid on 05/07/2018 08:43 pmQuote from: RDMM2081 on 05/07/2018 05:21 pmQuote from: robert_d on 05/07/2018 02:51 pm"Run as fast as you can, carefully"Made my morning! >Mine too! BTW,"Quantum potes fugere sedulo"Anyone want to design them a crest? Something like this?
Quote from: ZachF on 05/08/2018 01:39 amQuote from: docmordrid on 05/07/2018 08:43 pmQuote from: RDMM2081 on 05/07/2018 05:21 pmQuote from: robert_d on 05/07/2018 02:51 pm"Run as fast as you can, carefully"Made my morning! >Mine too! BTW,"Quantum potes fugere sedulo"Anyone want to design them a crest? Something like this?Perfect