An "R"-powered rocket build

Discussion in 'High Power Rocketry (HPR)' started by Rail Dawg, Nov 30, 2018.

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  1. Apr 15, 2019 #1501

    Ez2cDave

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    Chuck,

    So, now you've taken up "baking", as a hobby ? LOL !

    Nice "frosting", Chuck !

    Dave F.


    hurler-4.jpg
     
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  2. Apr 15, 2019 #1502

    Ez2cDave

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    Chuck,

    An excellent idea . . . Otherwise, the Drogue deployment might "fool" the Altimeter, giving you Main Deploy at 40,000 ft AGL +/- .

    That would be a VERY LONG "walk" !

    Dave F.


    hurler-4.jpg
     
  3. Apr 17, 2019 #1503

    noah_carter13

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    Does this finite analysis come on the 2018-2019 student edition of solidworks?
     
  4. Apr 17, 2019 #1504

    Rail Dawg

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    Taking the nosecone in today to get the aluminum tip built. As stated before the tip will have all-thread so it can be bolted to a lower plate.

    I'm thinking 3-4" in length should be plenty.

    Chuck C.
     
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  5. Apr 17, 2019 #1505

    Andrew_ASC

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    I don’t believe so. The university had some nice addons and had an “educational” full feature version which was unlocked as if it was a commercial license with the excuse of it was to be used for academic uses only. Many students complained the student version hardly did much to be honest. I never personally tried the student version.
     
  6. Apr 17, 2019 #1506

    noah_carter13

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    Okay, thanks!
     
  7. Apr 17, 2019 #1507

    noah_carter13

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    I think that will be good. The R powered rocket I designed in high school had a 9.6” steel tip (needed the weight for stability, was in a time crunch) we also looked at manufactured nose cones from various companies and measured their length ratios (tip : full length of nose cone) and took a rough average. Our nose cone was 7.74” OD, and 38.7” long (5:1 Von Karman) (went through mach 2.2)
     
  8. Apr 17, 2019 #1508

    Ez2cDave

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    Andrew,

    What about the 2016 "Premium" Edition ?

    Dave F.



    hurler-4.jpg
     
  9. Apr 17, 2019 #1509

    Theory

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    Cool deal!!!!!
     
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  10. Apr 18, 2019 #1510

    Ez2cDave

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    TO ALL,

    If you have an "issue" with the size of my "Hurler" image, on this thread, please "grow a pair" and say something on the open forum, rather than "whining" to the Mods !

    Here is the new "reduced" size . . .

    Dave F.

    hurler-4 - REDUCED.jpg
     
  11. Apr 18, 2019 #1511

    Ez2cDave

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  12. Apr 21, 2019 #1512

    Rail Dawg

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    Started work today on the Avionics Bay. I'll post pics once I get a little further along.

    It's going to have an aluminum u-channel on each side that the 6" x 12" Delrin plate for the electronics will slide into.

    The Bay is designed to be removed completely from the rocket for prepping. There's a permanent 1 1/2" switch band that is the same OD as the airframe and will be epoxied right in the middle of the AvBay. It's purpose is to house the access holes for the arming of the electronics.

    Again will post pics soon.

    Chuck C.
     
    Last edited: Apr 21, 2019
  13. Apr 21, 2019 #1513

    Ez2cDave

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    Chuck,

    Looking forward to pics . . .

    Dave F.

    hurler-5.jpg
     
  14. Apr 21, 2019 #1514

    Theory

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    What kind of switches are you thinking about? Given the anticipated performance I am thinking this is one area where you don’t need to go nutso.
     
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  15. Apr 22, 2019 #1515

    Lukun7

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    How heavy will the motor be?
     
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  16. Apr 22, 2019 #1516

    Rail Dawg

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    Good question.

    The switches are from SMT Design. You screw in the bolt from outside the rocket and it locks the spring switch into the "on" position.

    Nothing is fool-proof of course but this is a very robust way to keep a switch on.

    Chuck C.

    0002301_bay-switch-kit_1050.jpeg
     
    Last edited: Apr 22, 2019
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  17. Apr 22, 2019 #1517

    Rail Dawg

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    Loaded the "Q" is about 245 lbs and the "R" is about 285 lbs.

    The casing weighs about 100 lbs.

    Chuck C.
     
  18. Apr 22, 2019 #1518

    Theory

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    i like those switched Chuck!

    I can definitely see me using them on a future build.
     
  19. Apr 22, 2019 #1519

    tomsteve

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    we like videos of such events.;)
     
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  20. Apr 22, 2019 #1520

    Lukun7

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    Man, 385 pounds! Thats one big motor! What thrust are you hoping it will have?
     
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  21. Apr 22, 2019 #1521

    Rail Dawg

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    The "Q" starts out at 3100 lbs of thrust and ramps up for 9 seconds to 4100 lbs of thrust.

    Still working the "R" numbers but should have those available shortly.

    Chuck C.
     
  22. Apr 22, 2019 #1522

    Ez2cDave

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    Chuck,

    I really like the "concept" of that Switch Lock . . .

    A "word of caution" - You are still "at the mercy" of that cheap, little Chinese slide-switch,however !

    Dave F.


    hurler-5.jpg
     
  23. Apr 23, 2019 #1523

    Rail Dawg

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    Which is why of course we will be using 3 of them for full redundancy and then some.

    Thanks!

    Chuck C.
     
  24. Apr 23, 2019 #1524

    Ez2cDave

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    Chuck,

    Remember that each additional component introduces a potential "failure mode" . . . Be careful !

    Got your back . . .

    Dave F.


    hurler-5.jpg
     
  25. Apr 23, 2019 #1525

    Ez2cDave

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    Chuck,

    Have we been "naughty" and doing static-testing without posting video's, numbers, and data ?

    LOL !

    Dave F.


    hurler-5.jpg
     
  26. Apr 23, 2019 #1526

    Rail Dawg

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    Thanks. As we all know it's a fine line to walk when engineering a rocket that's for sure.

    Part of the reason we may just go with 2 Marsa altimeters and not install the back-up PerfectFlite StratoLoggerCF altimeter.

    Great to have back-ups but too many and there's a better chance of one altimeter deciding to misbehave.

    Chuck C.
     
    Last edited: Apr 23, 2019
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  27. Apr 26, 2019 #1527

    Rail Dawg

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    Working on the Avionics Bay. In the pic are the aluminum u-channels on the stringers for the Delrin board that houses the altimeters and GPS tracker.

    Also pictured are the SMT Designs on/off switches also mounted on stringers. The spring switch is placed "upside-down" in the slot with the wire terminals facing up. The screw is inserted and causes the spring switch to open.

    It's a very secure way to turn the electronics on and off.

    Chuck C. IMG_4957[1].JPG
     
    Last edited: Apr 26, 2019
  28. Apr 26, 2019 #1528

    Ez2cDave

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    Chuck,

    Do those screws have to be turned in all the way to activate the switch ? They seem kind of long to me.

    Dave F.


    hurler-5.jpg
     
  29. Apr 26, 2019 #1529

    Rail Dawg

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    The screws are the exact right length to securely activate the switch from outside of the rocket.

    Chuck C.
     
  30. Apr 26, 2019 #1530

    Ez2cDave

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    Chuck,

    OK . . . In that pic, they looked pretty long.

    Any static testing data yet ?

    Dave F.


    hurler-5.jpg
     

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