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Type: Posts; User: darisd

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  1. Replies
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    Not at the moment. Just got my L2 and it is kind...

    Not at the moment. Just got my L2 and it is kind of a mess. This however is a BNC termination.
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    I only recently started dual deploy this past...

    I only recently started dual deploy this past year. The main charge for my L2 was deep in a 4 inch tube, and my preliminary tests with hooking up terminal block connections by feel led me to seek...
  3. What size (diameter) is the nosecone? My 2.4...

    What size (diameter) is the nosecone?

    My 2.4 inch smoke has both a Raven 2 and a BRB 70cm unit mounded on a sled inside a 24mm body tube inside the nosecone. I added about, oh, three inches worth...
  4. So wait, the servo out is pulse-width modulated...

    So wait, the servo out is pulse-width modulated correct? What is the connector?

    I can see some interesting applications with airbrakes at apogee.
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    I have been flying my son's Blobbo on 24mm F and...

    I have been flying my son's Blobbo on 24mm F and G motors recently. I had a devil of a time getting the laundry to fully eject: out of four flights only one worked out well at apogee, two flights...
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    Any Fellow Kerbonauts?

    I started playing this game last weekend and I can't stop. It's all I think about.

    Anyone else addicted to Kerbal Space Program?
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    I don't think you want to pay that much. I have...

    I don't think you want to pay that much. I have great (painful) experience with negotiating special lot testing on electrical devices. Special lot tests (call them group A) run well in excess of $2k...
  8. I will augment your imagination. I do milliohm...

    I will augment your imagination.

    I do milliohm stuff at work all the time. 28 AWG stranded copper is around 3 to 4 milliohms per inch.

    Best Case: Assume your low current match is 2 ohms (Q2G2...
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    What an amazing thread! Unfortunately, I seem...

    What an amazing thread!

    Unfortunately, I seem to have taught myself a slipknot that is not on the list at Animated Knots. It is close to the Duncan Knot... something I must have taught myself over...
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    That was out at Plaster City, no? I had to stop a...

    That was out at Plaster City, no? I had to stop a chap from trying to fill his nosecone with quick-set epoxy and gravel a week ago and told him to stick it in his ice cooler. I can only imagine what...
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    Buy two of these...

    Buy two of these with two of these and make your own series harness.
  12. Thread: Nose Weight

    by darisd
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    I would also embed an eye bolt or threaded rod in...

    I would also embed an eye bolt or threaded rod in there, just in case, and link it to your main harness somehow. It is now one of the largest contiguous masses in your rocket and is pretty darn...
  13. It shouldn't matter what version you have,...

    It shouldn't matter what version you have, because the math on the back end is the same: as long as the Cd value is correct you can trust it. I think 0.7 is the default value in rocksim, whereas a...
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    I seem to recall seeing rather cheap "trickle"...

    I seem to recall seeing rather cheap "trickle" chargers that you are supposed to plug into your cigarette lighter in your RV so the battery stays "topped up" when you don't use it. Search Amazon. Cut...
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    Are we talking LiPo cells here? Then yes, you...

    Are we talking LiPo cells here? Then yes, you need separate controllers. But as long as the voltage does not sag from the cells, you should be fine running multiple 3.3V cells on the same >5V rail.
    ...
  16. Thread: 18mm cases?

    by darisd
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    Seriously? That is asking for trouble. With how...

    Seriously? That is asking for trouble. With how thin the case is... it would burn through for sure.
  17. I have heard of RC truck-style launchers. If I...

    I have heard of RC truck-style launchers. If I recall the context was in mission points for scale competition, but I could be wrong.
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    You know, I am being forced to eat my words here....

    You know, I am being forced to eat my words here. Last Sunday I had to come back and borrow Mark's Yagi to get my bird. It was a mile away... frustrating part was there was a little hill I where I...
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    I have to second what Mike is saying. Two things...

    I have to second what Mike is saying. Two things that I tend to want to know in the field are delay on a familiar design but unknown motor and CP on an unfamiliar design.

    The trick is how to get...
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    ^ Yes. These are all precisely what I do or have...

    ^ Yes. These are all precisely what I do or have tried.

    I have the high power version of the BRB Tx and a cheap HT, with NO Yagi or variable attenuator, just the plain ol rubber duckie. I have to...
  21. If a club were into it, I could see the pull of a...

    If a club were into it, I could see the pull of a "rocket cruise". I bet you could get away with not owning the boat and just charter it once or twice a year for the club. Charge $300 a head just...
  22. True! Assuming guidance was inertial only...

    True!

    Assuming guidance was inertial only (perhaps GPS corrected) and the "target" was within a few degrees of vertical (until you were ready to move beyond 50k ft of course) I don't see why there...
  23. I guess it is semantics: what do you define as...

    I guess it is semantics: what do you define as the target? Here, it is the moon. Or a highly elliptical LEO insertion orbit. Or the sun. Or the sky :)
  24. Offshore activities?? (not gambling related of course)

    Before you pass judgement, hear this out.

    So I was at a work function with some fellow engineers, and in conversation it came up that I was into high-power rocketry. One of my colleagues...
  25. Can I marry you?? Brandon: think this way,...

    Can I marry you??

    Brandon: think this way, and Matrix Algebra will be a piece of cake. Seriously, arranging terms like this on my Engineering exams, type in the mess and use RREF() on my TI-89, I...
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    No metric love here??? I use M2/.4 everywhere.

    No metric love here??? I use M2/.4 everywhere.
  27. Holy Convergent Engineering Batman! I totally...

    Holy Convergent Engineering Batman! I totally just posted about that above! :D
  28. Seems like a bunch of different answers! I like...

    Seems like a bunch of different answers! I like hearing more ideas!

    I have done various things myself. One goal is to be able to inspect and replace the shock cord quickly. Commonly I lasso the...
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    Transient loads on the airframe are greatest...

    Transient loads on the airframe are greatest takeoff (and landing assuming you made it there). Static loads are fundamentally the same, sure. It was just a thought.

    Peace.
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    They use RP1/LOX for their first stage: they...

    They use RP1/LOX for their first stage: they could launch wet cryo tanks only, then air-fuel with a standard tanker the kerosene tanks under more-or-less steady-state structural conditions just...
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