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But you're smart not to let the tool replace common sense. On the TARC Yahoo group someone wanted to know what was wrong with his altimeter. RocSim said the rocket would go to 800' and it only went to 600' so something had to be wrong with the altimeter.
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Bill Spadafora http://www.billsplumbing.com billspad@comcast.net bill@billsplumbing.com |
#22
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Carl McLawhorn NAR#4717 L2 semroc.com |
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Doug .
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YORF member #11 |
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For me, coming out of school in 83, LS-TTL was king, and was soon replaced by FAST-TTL. I did many board designs with that back in the late 80s. That technology will always be my paradigm. I was actually a bit saddened a few years ago when I learned that all bi-polar logic had gone by the wayside Doug (And no, Bill, bi-polar logic is not the term used to describe how schizophrenics think ) .
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I still design with 74HCT as glue. I just can't see the numbers on the surface mount parts. The sick joke is that as the early logic designers lose their eyesight, the IC companies make the parts even smaller. I used to laugh at my elders at Telex that carried a jeweler's loupe to see the parts back then. I did not realize I was laughing at my future self as well.
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Carl McLawhorn NAR#4717 L2 semroc.com |
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Carl McLawhorn NAR#4717 L2 semroc.com |
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The "picture" reference has to do with the fact that his pictures are usually so shrunken as to be illegible Doug .
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Even then, that parts are so small now that we have to create encoded part numbering tables in the datasheets. The user reads a 4- or 5-character number off the IC package, then looks it up in the datasheet to get the complete umpteen character part number. If you don't already know the root part number, you won't know which datasheet to use. In some ways, the parts might as well be not branded I don't think the various divisions within the company here cooperate on the encoded strings, so two entirely different parts, such as an op-amp and a temp sensor, which happen to share the same tiny package, such as a SOT23-6, might have the same encoded marking. So even if you can read the number, you still won't figure out what it is Doug .
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#29
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Quickie A2 Test Rocket
Here's what RockSim suggests the flight performance could be for the A2-5. There may still need to be some tweaking with the numbers, as I think the RS engine editor is forcing slightly higher impulse and thrust values than what Carl gave earlier. Not by a whopping amount, but enough that the simulated performance might be a bit hot.
Design specs can be found on the 2D plan view. Launch rod was set at 48", but the model as-shown will launch from a 36" x 1/8" rod.
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
#30
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Carl,
Thought you could use a little inspiration. Here's a picture of the casting mandrel for a little something NASA's hard at work on these days. |
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