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  1. #181
    Join Date
    29th August 2015
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    Pittsburgh
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    167
    Quote Originally Posted by LithosphereRocketry View Post
    Where do you get your PCB prints? I have a simple staging controller made in Autodesk's Circuits.io but I haven't been able to find a ton of information about printing.
    I used http://www.4pcb.com/. It looked a little expensive but it gets high marks on quality. So I started processing the order and got a grand surprise on checkout. 90 FREAKING BUCKS for shipping! I will not repeat. There are a number of sources for PCBs out there that batch hobby quantities. You just have to plan ahead.

    David Carter
    NAR 98850, TRA 16834, Level 3
    http://www.psc473.org/ http://urrg.us/

    90% of rocketry is sanding! (And a little bit of cursing...)

  2. #182
    Join Date
    28th January 2009
    Location
    Boise, ID
    Posts
    532
    OSH Park for cheap pcb's if it's small and you're not in a big hurry, AKA pcbway.com


  3. #183
    Join Date
    19th February 2017
    Location
    The world, probably
    Posts
    137
    Quote Originally Posted by vcp View Post
    OSH Park for cheap pcb's if it's small and you're not in a big hurry, AKA pcbway.com
    Yeah, I found them after hearing about 4PCB's shipping nonsense. That's probably what I'll do.
    crmrc.org

  4. #184
    Join Date
    29th August 2015
    Location
    Pittsburgh
    Posts
    167
    Well it's not ready to fly. Not even close despite a week of solid effort. My 3D printing issues had me put just too far behind. Le sigh.

    Sorry I haven't been posting updates but I've been kind of focused. I'll post more when I get back from URRF. In the mean time it's time to pack up and go fly some rockets!
    David Carter
    NAR 98850, TRA 16834, Level 3
    http://www.psc473.org/ http://urrg.us/

    90% of rocketry is sanding! (And a little bit of cursing...)

  5. #185
    Join Date
    18th January 2009
    Location
    Virginia - Central
    Posts
    3,812
    Quote Originally Posted by grandcross View Post
    Well it's not ready to fly. Not even close despite a week of solid effort. My 3D printing issues had me put just too far behind. Le sigh.

    Sorry I haven't been posting updates but I've been kind of focused. I'll post more when I get back from URRF. In the mean time it's time to pack up and go fly some rockets!
    Hey...have fun!
    We got two categories of pilots around here. We got your prime pilots that get all the hot planes, and we got your pud-knockers who DREAM about getting the hot planes.
    Now what are you two pud-knockers gonna have?... Huh?
    Pancho Barnes-
    The Right Stuff
    http://www.mwavs.com/0053148414/M4RS...udknockers.m4r

    Tripoli #2747

  6. #186
    Join Date
    27th June 2017
    Posts
    1
    I have used Seeed Studio Fusion for PCB manufacturing more than a few times. For my own stuff and also prototypes for work. Seems decent.

  7. #187
    Join Date
    27th August 2011
    Location
    NJ
    Posts
    2,714
    she is looking awesome so far!!

  8. #188
    Join Date
    29th August 2015
    Location
    Pittsburgh
    Posts
    167
    With the big push I gave to try getting this ready for URRF, I've taken a short break to recover and relax. On the positive side, now I have the luxury of being able to do things as I want. So tonight I'm taking stock of where I am.

    First up is the SIB stage. This is the part that wasn't structurally complete in time. Shown here is the fin can with LOX tanks installed, and the fuel tanks ready to be added. I needed to paint these before installing and with rainy weather this was my demise. The coupler is shown in place, but this is obviously not attached yet.

    Click image for larger version. 

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    There are a few details on the tanks worth mentioning. I 3D printed some of the vents and fill pipes. The red stripe is the shaped charge used to destroy the rocket in the event of failure, but mine is just a red stranded wire passed through holes drilled in the tanks and CA glued into place.

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    As you can see, the fin can is still in need of some more sanding. So the delay is a plus in that regard. Plus I'll be able to add some more details.

    Also, the clustered motor mounts won't be installed until after the tanks are in place, and now that may take a little longer. Wiring also has to happen.

    Next up... upper stage.
    David Carter
    NAR 98850, TRA 16834, Level 3
    http://www.psc473.org/ http://urrg.us/

    90% of rocketry is sanding! (And a little bit of cursing...)

  9. #189
    Join Date
    29th August 2015
    Location
    Pittsburgh
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    167
    Here's the upper section. Yes, it's that tall.

    Click image for larger version. 

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    The CM and LES bring the total height to about 6 feet (using the always precise it's almost as tall as I am technique).

    Click image for larger version. 

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    There are still details to add, including all the plastic stringers. Unfortunately due to cleaning up the epoxy that ran down when I added the nose weight, some of the existing stringers were damaged and will need replacing. It's not too difficult but it is a pain. Other than the stringers because there's just so many of them, this should go pretty quickly.

    So other stuff. Wiring still has to happen, but that is all ready to go and won't take long. The mating portion for the two stages will be a little trickier in terms of getting the internal tubes cut to the correct lengths and glued into place. Priming, sanding, painting, and repeating. Oh, and decals.

    I've been talking to stickershock, but I was supposed to send him detailed requirements a few months ago. I should get on that!

    So not sure when it will launch yet. Depends on my motivation level as much as anything. Hopefully this year.
    Click image for larger version. 

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    David Carter
    NAR 98850, TRA 16834, Level 3
    http://www.psc473.org/ http://urrg.us/

    90% of rocketry is sanding! (And a little bit of cursing...)

  10. #190
    Join Date
    27th August 2011
    Location
    NJ
    Posts
    2,714
    that looks awesome!!

  11. #191
    Join Date
    18th January 2009
    Location
    Virginia - Central
    Posts
    3,812
    Quote Originally Posted by grandcross View Post
    Here's the upper section. Yes, it's that tall.

    Click image for larger version. 

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    heh heh.....wait till you stack up all the parts, downright scary.

    nice detailing BTW.
    We got two categories of pilots around here. We got your prime pilots that get all the hot planes, and we got your pud-knockers who DREAM about getting the hot planes.
    Now what are you two pud-knockers gonna have?... Huh?
    Pancho Barnes-
    The Right Stuff
    http://www.mwavs.com/0053148414/M4RS...udknockers.m4r

    Tripoli #2747

  12. #192
    Join Date
    27th August 2011
    Location
    NJ
    Posts
    2,714
    Dave...you are going to need to build a smaller version of the VAB in your back yard to store her. Just looks spectacular! she is a tad bit bigger than my last 1b build.

  13. #193
    Join Date
    29th August 2015
    Location
    Pittsburgh
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    167
    Quote Originally Posted by NJRick View Post
    Dave...you are going to need to build a smaller version of the VAB in your back yard to store her. Just looks spectacular! she is a tad bit bigger than my last 1b build.
    Just a wee bit

    I already have plans for a display stand. It uses a 75mm x 3' oak dowel, and it will be displayed on an angle to that it can fit in a standard height room.
    David Carter
    NAR 98850, TRA 16834, Level 3
    http://www.psc473.org/ http://urrg.us/

    90% of rocketry is sanding! (And a little bit of cursing...)

  14. #194
    Join Date
    29th August 2015
    Location
    Pittsburgh
    Posts
    167
    After the failed push to get it flight ready for URRF, I've been taking a break. Well, I'm back.

    To get it flight ready, I was taking some short cuts in terms of finish and details. Today, I'm back to sanding, filling, and repeating, for the fin can anyways. I'm not sure how this is all going to play out with the whit oxidizer tanks in place, but I'll muddle through somehow. I'm away for work this week, but the week following I'm off so it's all rockets all the time. If it's flight ready, I'll fly it at the URRG September launch but I'm not going to push it. Let's see how it goes.

    Click image for larger version. 

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    Everybody likes sanding, right? That's what I thought. On a positive note I got a new detail sander. It's perfect for the small spaces and tight corners on this fin can.

    Click image for larger version. 

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    I still hate sanding.
    David Carter
    NAR 98850, TRA 16834, Level 3
    http://www.psc473.org/ http://urrg.us/

    90% of rocketry is sanding! (And a little bit of cursing...)

  15. #195
    Join Date
    18th January 2009
    Location
    Virginia - Central
    Posts
    3,812
    Sanding.
    And more sanding. LOL.

    Well, as you said....90 % of rocketry is sanding!

    I've spent much of my summer flying RC with my local club and finished several new planes...I had my share of sanding to do on those.
    Can't seem to get away from it - unless you fly RTF/ARF planes or those darned foamies.
    We got two categories of pilots around here. We got your prime pilots that get all the hot planes, and we got your pud-knockers who DREAM about getting the hot planes.
    Now what are you two pud-knockers gonna have?... Huh?
    Pancho Barnes-
    The Right Stuff
    http://www.mwavs.com/0053148414/M4RS...udknockers.m4r

    Tripoli #2747

  16. #196
    Join Date
    29th August 2015
    Location
    Pittsburgh
    Posts
    167
    Well, it's been a busy few days. Mostly sanding. The fin can looks good from a few feet away, but not so good close up. I have no patience for another week of fill, prime, sand, repeat, so I hereby declare it good enough.

    So on to details.

    Click image for larger version. 

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    8 groups of 14 stringers = 112 stringers. It's not sanding but it is tedious. I also added personnel hatches cut out of Avery labels for effect. Unfortunately the addition of paint caused them to warp.

    Click image for larger version. 

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    Guess what I'm doing in the morning? Sanding. Le sigh. And then I dropped the paint container as I was removing it from the sprayer. Splash!

    Time to watch some TV. But hey... progress!
    David Carter
    NAR 98850, TRA 16834, Level 3
    http://www.psc473.org/ http://urrg.us/

    90% of rocketry is sanding! (And a little bit of cursing...)

  17. #197
    Join Date
    29th August 2015
    Location
    Pittsburgh
    Posts
    167
    Big day today!

    It started with the previously mentioned sanding. I redid the white paint, but I haven't done the roll patterns yet. My original thought was to get that done before putting the tanks in place, but I have enough touch ups to do I don't think it will matter. So...

    The tanks are in place! Yay!

    Click image for larger version. 

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    The coupler and spider beam cover are just dry fitted, but they'll be put on later tonight. I still have to add the 38mm motor mounts, the 75mm retainer, some other mechanical odds and sods, and of course electronics. But it's looking promising for the URRF launch this weekend. It just won't look that pretty. Yet.
    David Carter
    NAR 98850, TRA 16834, Level 3
    http://www.psc473.org/ http://urrg.us/

    90% of rocketry is sanding! (And a little bit of cursing...)

  18. #198
    Join Date
    29th August 2015
    Location
    Pittsburgh
    Posts
    167
    SO much stuff! Looks like I'll launch this weekend but it's been a busy few days, so let me catch you up.

    First up... motor mounts. Getting the outboard clusters at the right angle required a jig, so to the 3D printer.

    Click image for larger version. 

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    Next, it was a matter of filling the holes. The business end of this is looking impressive

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    And of course wiring the custom cluster controller with the two PerfectFlite Mini-Timer 4's.

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    David Carter
    NAR 98850, TRA 16834, Level 3
    http://www.psc473.org/ http://urrg.us/

    90% of rocketry is sanding! (And a little bit of cursing...)

  19. #199
    Join Date
    29th August 2015
    Location
    Pittsburgh
    Posts
    167
    The hardest part of this build is connecting the inner airframe. I have a 75mm tube going into a 98mm tube. That involves centering rings, and of course my pyrotechnics bay. It's like an ebay, except the electronics are external, but it is my separation point.

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    This is a critical piece. Too short, and the outer airframe takes the load, which it is not supposed to do. Too long, and there is a visible gap between sections, the electronics don't fit in the right place, etc... Too long would be better though as I can at least remove material more easily. After careful measurement, I glued the transition into the upper airframe.

    Click image for larger version. 

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    David Carter
    NAR 98850, TRA 16834, Level 3
    http://www.psc473.org/ http://urrg.us/

    90% of rocketry is sanding! (And a little bit of cursing...)

  20. #200
    Join Date
    29th August 2015
    Location
    Pittsburgh
    Posts
    167
    First fitting!

    I had to use the whole length of my kitchen for this. I certainly couldn't do it standing up. With the typical I could use 3 more hands, it was a bit of a task getting it lined up correctly, but with a final push it went home. Yay!

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    This thing is impressive! Still a lot of details to add but it's looking pretty sharp.

    And I was off by about 1 cm in my measurements. Time to do some trimming...

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    Well, back at it. I have a few more details to wrap up so I can fly!
    David Carter
    NAR 98850, TRA 16834, Level 3
    http://www.psc473.org/ http://urrg.us/

    90% of rocketry is sanding! (And a little bit of cursing...)

  21. #201
    Join Date
    19th February 2017
    Location
    The world, probably
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    137
    Quote Originally Posted by grandcross View Post
    First fitting!

    I had to use the whole length of my kitchen for this. I certainly couldn't do it standing up. With the typical I could use 3 more hands, it was a bit of a task getting it lined up correctly, but with a final push it went home. Yay!

    Click image for larger version. 

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    This thing is impressive! Still a lot of details to add but it's looking pretty sharp.

    And I was off by about 1 cm in my measurements. Time to do some trimming...

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    Well, back at it. I have a few more details to wrap up so I can fly!
    Beautiful!

    I may have to make it "across the pond" someday to see what you guys are doing at URRG... Yes, I finished first, but I didn't have 300 stringers to add

    crmrc.org

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