MAC Pappy: 54mm screamer!

Discussion in 'High Power Rocketry (HPR)' started by ECayemberg, Mar 31, 2017.

Help Support The Rocketry Forum by donating:

  1. Jul 28, 2017 #31

    ECayemberg

    ECayemberg

    ECayemberg

    Well-Known Member

    Joined:
    Jan 21, 2009
    Messages:
    2,584
    Likes Received:
    234
    Cool! Looking forward to it!!!

    Hi Glen! Derr, umm, well...not exactly mine to share; others have definitely gone here before I:). I'll share what was shared with me; I gave it a best guess and then did some experimenting and fine tuning since then.

    Three components:
    1. a high temp matrix; preferably non-epoxy.
    2. an inert pigment.
    3. A high head filler that is sandable.

    Thank you sir! Loving the FiberMax build!

    Thanks Bob! Plan is to use a Missileworks RTx sticking up in the non-carbon nosecone. Logistics of fitting it all into place to follow. We'll see if it all fits!
     
  2. Aug 11, 2017 #32

    ECayemberg

    ECayemberg

    ECayemberg

    Well-Known Member

    Joined:
    Jan 21, 2009
    Messages:
    2,584
    Likes Received:
    234
    A flurry of activity behind the scenes; not as much documentation online here. Nevertheless, here's a brief update.

    Electronics

    Got that mostly sorted out. Two RRC2+'s ride and a 9V battery ride on one side; an RTx, 9V and LIPO ride on the other side. All Missileworks electronical doo-dads. The bay is a bit longer than traditional, but it all fits.

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    By the way, love Mike's 3D Printed sleds, but needed a bit more length here, so went with "traditional" G-10 and brass tube combo.

    Took a quick break to take in Airventure in Oshkosh. Heck of a show this year. Not the right era, but Pappy's ride. Tobuls' Korean era F4U:

    [​IMG]

    Hiccup?

    So we've hit a minor speed bump. I did the traditional bend-the-crap-out-of-the-fins-in-every-imaginable-direction-with-great-force test and determined that the tips flex more than I care for considering the speed achievable with this thing. Not a deal breaker, but let's fix that!

    Mark a line:

    [​IMG]

    Sand ablative stuff outside the line. I'll be building up thickness and strength using 2 layers of Carbon Uni and a top layer of traditional 5.7oz woven carbon. That uber-bevel on the fins bit me here...my fault, not Mike's!

    [​IMG]

    Speaking of ablative stuff, I've begun experimenting with this. BVM only makes and sells really good stuff....it isn't cheap but I'm curious to see how it'll work! Hobby cross-over!:cool:

    [​IMG]

    That's all for now....layup of the fin tips coming up next, then final finishing.
     
  3. Aug 13, 2017 #33

    Bobfly

    Bobfly

    Bobfly

    Lifetime Supporter TRF Lifetime Supporter

    Joined:
    Jul 3, 2017
    Messages:
    193
    Likes Received:
    25
    Wow Eric, you were able to cram a lot of electronics into a super small AV Bay. I assume that the brass tubes are just epoxied to the sled?

    Good Luck with your project.

    Bob
     
  4. Aug 24, 2017 #34

    Locksmith

    Locksmith

    Locksmith

    Forum Supporter TRF Supporter

    Joined:
    Feb 15, 2017
    Messages:
    205
    Likes Received:
    49
    What's your plan for the GPS Antenna?
    Looking good so far.
     
  5. Aug 24, 2017 #35

    markkoelsch

    markkoelsch

    markkoelsch

    Well-Known Member

    Joined:
    Mar 18, 2009
    Messages:
    4,300
    Likes Received:
    145
    Eric, how are you restraining your batteries?
     
  6. Aug 25, 2017 #36

    Bobfly

    Bobfly

    Bobfly

    Lifetime Supporter TRF Lifetime Supporter

    Joined:
    Jul 3, 2017
    Messages:
    193
    Likes Received:
    25
    Hi Eric,

    I would also like to know how you are going to install switches for all three pieces of avionics? The AV Bay looks great!

    All the best,
    Bob
     
  7. Aug 25, 2017 #37

    BBrown

    BBrown

    BBrown

    Kloudbuster Prefect

    Joined:
    Dec 9, 2009
    Messages:
    439
    Likes Received:
    159
    Gender:
    Male
    Location:
    Wichita, KS
    Eric,
    Seven days and counting! The long range forcast for Airfest is highs in the mid 80's with single digit winds. If that holds, this may be one very busy Airfest.
    See you in a week,
    Bob
     
  8. Aug 25, 2017 #38

    ECayemberg

    ECayemberg

    ECayemberg

    Well-Known Member

    Joined:
    Jan 21, 2009
    Messages:
    2,584
    Likes Received:
    234
    Thanks for checking in, guys! I'm a bit behind posting updates; rocket is in VHT Primer now! The additional lamination of the fin tips worked fantastic; there's no flex in the fins anymore. Will play some catch up in the documentation of the build asap...but it may be after Airfest.:)

    Thanks! Antenna sticks up into the fiberglass nosecone. Have tested this on a previous rocket and worked well.

    Two ways. A strip of battery-width foam doubled sided tape goes between the battery and the sled...this provides an anti-slip mating surface. Then, three zip ties wrap around the batteries, two around the "sides", one around the "length". Holes for the zipties are visible in the sled. Tested to M3!

    Switches! Switches? I've had two switches fail on me in my rocketry career. I've never had twist and tape fail me. Thus, twist and tape stranded core wire.

    Holy cats! Can't wait Bob...I'm soooo looking forward to returning to the rocket pasture! You and the Kloudbusters Krew run a top notch launch; just can't wait! With you giving the 7 (now 6!) day countdown, I'm happy that this thing is in primer!
     
  9. Aug 29, 2017 #39

    Jarhead

    Jarhead

    Jarhead

    Well-Known Member

    Joined:
    Oct 1, 2013
    Messages:
    290
    Likes Received:
    1
    Nice.
    Flight updates quickly please
     
  10. Sep 11, 2017 #40

    Cl(VII)

    Cl(VII)

    Cl(VII)

    Chris Bender, Lab Rat TRF Sponsor

    Joined:
    Feb 22, 2013
    Messages:
    4,089
    Likes Received:
    185
    Did this fly?

    If so, how did the "Heat Shield" hold up?
     
  11. Sep 11, 2017 #41

    ECayemberg

    ECayemberg

    ECayemberg

    Well-Known Member

    Joined:
    Jan 21, 2009
    Messages:
    2,584
    Likes Received:
    234
    Hi Chris. Unfortunately it did not. Full details to be posted this evening....I do fear that the BVM Heat Shield may be a bit soft for the supersonic flow. In other words, it applies well, is uniquely sandable, but remains a bit softer than I'd desire, and could be peeled up with some effort. Thanks for checking in! :)
     
  12. Sep 11, 2017 #42

    ECayemberg

    ECayemberg

    ECayemberg

    Well-Known Member

    Joined:
    Jan 21, 2009
    Messages:
    2,584
    Likes Received:
    234
    I did not get a chance to fly this speedy little critter at Airfest. For that I apologize; my intent was never to disappoint anyone.

    Behind the scenes, I had two *other* relatively high altitude, fast moving projects slated for flight at Airfest. One is a well traveled 4.5” bird that’s been to Black Rock and back, and now Argonia and back; originally built for Balls 22, and still hasn’t flown…though IT WILL SOON. The other is a well-flown 75mm bird named Carbon Slipper that’s been all over and is well versed in melting stuff courtesy of drag-induced heat. The latter carried a carbon-copy of the electronics and tracking package for Mac Pappy, serving as a good test bed for the more aggressive 54mm M flight. I did choose to fly Carbon Slipper first upon arrival at Airfest.

    So let’s proceed with the Carbon Slipper flight; it flew early Friday afternoon to ease into the Airfest experience. I had good GPS lock and satellites in the pits, but had trouble acquiring signal out at the pads…go figure. After eventually getting good lock, the rocket was erected on the pad, alts armed, camera recording, and away we went. Nice straight flight and the Fly-Away Rail Guides worked flawlessly. No pictures as both my camera and Dave B’s camera freaked out during the countdown…go figure! The first packet retrieved after boost was a hair over 30k msl, then a few additional packets as it descended telling me that it was under a controlled descent. At 24,000’+ msl, the GPS signal cut out and was never regained. I did not have my trusty Com-Spec tracker in as a backup…go figure! There was no room in the Mac Pappy for the backup RF tracker, so this was again a true representation of the Pappy setup. For recovery ops, we first went to the last received coordinates…not surprisingly, no sign of Carbon Slipper. Walked ¾ of a mile out and back on the same line…nothing. Went to RSO for my shift Friday afternoon, then went back out again after the range closed. Walked over 2 miles in the generally predicted dispersion area…though late in the day, it was still hot for this ‘Sconsin boy….nothing.

    At supper Friday evening, Crazy Jim offered to bestow his Windy.com app knowledge on me in order to hopefully find the Slipper. He spent the balance of his evening working through the wind direction, magnitude at different wind levels until we finally arrived at a calculated landing location. Crazy Jim ain’t so crazy; he’s pretty darn bright and helpful….but you probably already knew that! MANY thanks to CJ for spending his Friday night playing descent calculator with me!!!!

    Saturday was a great day; full of wonderful activities that we thoroughly enjoyed. Helped prep and fly some really neat projects; had a great time visiting with folks in the afternoon at the RSO tent. Had a rocket out to the away pads and wasn’t able to fly it. It was a great day; no regrets, but ultimately I was unable to personally fly on Saturday….and Carbon Slipper was still missing. After my shift ended, I went out in search of Carbon Slipper again, this time starting the search .75miles East of the last received coordinates. I walked for about an hour and a half in the projected landing zone…nothing. I gave up walking and returned to the vehicle. Forever in the back of my mind lies “It’s always further out than you expect”. That thought drove me to driving around for a bit, navigating farther and farther South-Southeast of the rocket pasture. As the sun began to settle, to my disbelief, I stumbled upon a pink chute 15’ off the side of the road. Could it be? Sure enough, roughly 3 miles south and 2 miles east, Carbon Slipper was found. Returning really late to the Burger Bash, I celebrated the find with my friend the Spotted Cow and some tasty food that Jay grabbed for me in my absence (thanks Jay!). You see, I have a lot of rockets and I’m okay with losing one on occasion; but this one is special to me. For various reasons, but most of which is that it is signed in Silver Sharpie by my late friend Dale that always supported and encouraged rocket efforts in my home area. I’ve melted epoxy, paint, carbon, and otherwise off this rocket, but his silver signature remains onboard the rocket. It’s worth a lot to me and I wanted it to come back home! It’s also my Wolf Park rocket (side story there…if you dig you may just find it).

    So, it’s Saturday evening and the sun is set. I have the 12’+ Mother Lode fully prepped but not yet flown; Mac Pappy is 95% prepped and could be flown Sunday as well. But A) gotta hit the road Sunday afternoon in order to make it home to see the family and work on Tuesday, B) still no idea for why my signal failed me at 24k’! As I mentioned, there is literally no extra room for an RF tracker in that lil’ critter as built. C) Plus, it took Kyle three tries to get his M1378 lit; and frankly I didn’t have that kind of time on Sunday. So I ask: would you have flown it? As stated in the Viper Family thread; I’m lifting Whitney’s words….rocketry isn’t all about the rockets; an event such as Airfest is as much about the people as it is the projects. Would I have loved to fly more: absolutely yes! Do I have any regrets about the way it all went down: absolutely not!

    Then some Thank You’s. I realize much of this is not directly related to the Pappy Project, but it’s all tied together under the rocketry umbrella!

    -Kloudbusters! What a fantastic launch! Just unmatched camaraderie, environment, opportunities, and experiences. Many of us love the Argonia experience; it’s thanks to you guys. Thank you so very much!
    -Crazy Jim for spending the time going over the Windy App with me, determining a general landing location after some calculations. Wouldn’t have found it without you! Wow; thanks bud!
    -Jason Griffin: hooking us up for the computer read outs. Thanks for taking the time to do so!!!!
    -Tom C: Pad help and travel partner; walking the field Friday night
    -Jay and Dave for covering the first few minutes of my RSO shift while we were out searching a bit!
    -Dave Rose, Deb Koloms, Tom Blazanin for holding onto the Slipper between XPRS and Balls
    -Dennis Watkins: delivering the loaded Slipper from Black Rock to Princeton
    -David Reese and Ryan Sebastian (RIP my friend) for juggling motors; one of which was the M1545 used in the Slipper flight.

    [​IMG]

    [​IMG]

    [​IMG]

    ...more to come...
     
  13. Sep 12, 2017 #43

    LithosphereRocketry

    LithosphereRocketry

    LithosphereRocketry

    Pining for the Fjords

    Joined:
    Feb 19, 2017
    Messages:
    784
    Likes Received:
    11
    Interesting that the first 2" or so of the nose was untouched, but the rest was scorched... Metal tip?
     
  14. Sep 12, 2017 #44

    Cl(VII)

    Cl(VII)

    Cl(VII)

    Chris Bender, Lab Rat TRF Sponsor

    Joined:
    Feb 22, 2013
    Messages:
    4,089
    Likes Received:
    185
    Thanks for the update, and I would have done just as you did. Don't fly with a glitchy tracker.
     
  15. Sep 12, 2017 #45

    Dwatkins

    Dwatkins

    Dwatkins

    Well-Known Member

    Joined:
    Dec 10, 2011
    Messages:
    625
    Likes Received:
    10
    Your more than welcome! Anytime buddy. I seem to know that Wolf
    Park 😂
     

Share This Page

Group Builder