Super Big Bertha... Awesome kit

Discussion in 'Mid Power Rocketry (MPR)' started by Jozef, Oct 10, 2018.

Help Support The Rocketry Forum by donating:

  1. Oct 10, 2018 #1

    Jozef

    Jozef

    Jozef

    Well-Known Member

    Joined:
    Aug 26, 2014
    Messages:
    236
    Likes Received:
    20
    Gender:
    Male
    Pouring rain here in Central Illinois the past week, so abandoned plans to paint a HPR build and pulled Super Big Bertha from the build inventory. What a great kit. Love the laminated fin design.... just like the Mega Der Red Max. Would be great to see more PSII issues with this construction. Deviations from stock include mini rail buttons, small diameter kevlar harness, nylon chute and baffled coupler. All wood glue except epoxy for motor mount and coupler to airframe.... don't like the "grab" from wood glues. When I go to HPR launches I always bring a couple of Estes E/F fliers to settle my nerves. Nice work Estes.. IMG_6583.JPG IMG_6583.JPG
     
    Tyler P and Nytrunner like this.
  2. Oct 10, 2018 #2

    shreadvector

    shreadvector

    shreadvector

    Well-Known Member

    Joined:
    Jan 19, 2009
    Messages:
    8,666
    Likes Received:
    35
  3. Oct 11, 2018 #3

    5x7

    5x7

    5x7

    Well-Known Member

    Joined:
    Jan 20, 2009
    Messages:
    692
    Likes Received:
    13
    Is it a normal estes thin wall bt-80 tube?
     
  4. Oct 11, 2018 #4

    Jozef

    Jozef

    Jozef

    Well-Known Member

    Joined:
    Aug 26, 2014
    Messages:
    236
    Likes Received:
    20
    Gender:
    Male
    Yes. Not like the white tube in the old PSII kits which were a tad thicker.
     
  5. Oct 11, 2018 #5

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
    Are those C/L stunt planes I see in the background?
     
  6. Oct 11, 2018 #6

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
    Recently completed a SBB, the fins were murder to get rounded. I tried a razor plane, ended up with 150 grit on a palm sander! Well worth the effort, it is a beautiful sight going up on an F 15.
     
  7. Oct 11, 2018 #7

    Jozef

    Jozef

    Jozef

    Well-Known Member

    Joined:
    Aug 26, 2014
    Messages:
    236
    Likes Received:
    20
    Gender:
    Male
    Yup.. A classic Jet Buccaneer that is 20 years old, A rebuilt Sig ARF and two Norvell .049 powered Baby Clowns. In the shop are a few others in bones and a Fancherized Twister with a Double Star 40. Have flown Cl in years. Local club folded 4 years ago. Still fly RC. Yellow plane in background in a 89 inch MXS-R with a 60cc twin
     
  8. Oct 11, 2018 #8

    Jozef

    Jozef

    Jozef

    Well-Known Member

    Joined:
    Aug 26, 2014
    Messages:
    236
    Likes Received:
    20
    Gender:
    Male
    Yup.. A classic Jet Buccaneer that is 20 years old, A rebuilt Sig ARF and two Norvell .049 powered Baby Clowns. In the shop are a few others in bones and a Fancherized Twister with a Double Star 40. Have flown Cl in years. Local club folded 4 years ago. Still fly RC. Yellow plane in background in a 89 inch MXS-R with a 60cc twin
     
  9. Oct 11, 2018 #9

    Jozef

    Jozef

    Jozef

    Well-Known Member

    Joined:
    Aug 26, 2014
    Messages:
    236
    Likes Received:
    20
    Gender:
    Male
    I may round the LE only...maybe not. The rocket is intended to be "draggy" with slow liftoffs and longer burns... Got a pic of your SBB?
     
  10. Oct 12, 2018 #10

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
    [GALLERY=media, 3464
    79]IMG_3025[1] by scott johnson posted Aug 21, 2018 at 9:20 AM[/GALLERY]
     

    Attached Files:

  11. Oct 12, 2018 #11

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
    I flew C/L back in the 1970s with my dad, had a Ringmaster with a Fox .35 and tried to get back into it a few years ago with a Skyray 35 with a Thunder Tiger .40 running a home made venturi. The years haven't been kind, got way too dizzy!
     
  12. Oct 12, 2018 #12

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
    I'll be launching Sunday morning if the weather is good, just had Hurricane Michael pass through SC and dump a ton of rain on us. I'll shoot some video and share. I made the maiden launch last Sunday at the ROSCO launch in Rembert, SC and totally forgot to film it!
     
  13. Oct 12, 2018 #13

    Jozef

    Jozef

    Jozef

    Well-Known Member

    Joined:
    Aug 26, 2014
    Messages:
    236
    Likes Received:
    20
    Gender:
    Male
    Nice fleet of Berthas. Looking forward to your launch report. BTW, the Buccaneer has a TT40. Had a home in the OBX for 8 years... familiar with the hurricane thing.
     
  14. Oct 14, 2018 #14

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
  15. Oct 14, 2018 #15

    Jozef

    Jozef

    Jozef

    Well-Known Member

    Joined:
    Aug 26, 2014
    Messages:
    236
    Likes Received:
    20
    Gender:
    Male
    Beautiful flight. What motor was in it?
     
  16. Oct 14, 2018 #16

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
  17. Oct 14, 2018 #17

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
    I want to try it on a composite 29mm, but will have to wait until Ken from Performance Hobbies shows up for the ROSCO launch in November. Hazmat shipping is a wee bit expensive, there are no hobby shops around here that sell rocketry supplies worth a hoot!
     
    Nytrunner likes this.
  18. Oct 14, 2018 #18

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
    BTW, I am using the stock shock cord and the trifold cord mount. 24" nylon chute from Apogee. I have a second SBB in the build pile that will get kevlar mounted to the baffle. I also use the JLCR and a nomex chute protector, but still managed to put a hole in it this am.
     
  19. Oct 15, 2018 #19

    Jozef

    Jozef

    Jozef

    Well-Known Member

    Joined:
    Aug 26, 2014
    Messages:
    236
    Likes Received:
    20
    Gender:
    Male
    I've singed a couple of chutes as well. Been using a couple of sheets.of Estes PSII wadding for insurance...then the Nomex. Get it at Hobby Lobby using the 40% off coupon. Also found the Nomex from Mac Performance Rocketry to be the most resistant to blow-by and burn through. I have had several flights with CTI 3 grain F motors in a modified Big Daddy prepped as described with no issues. Hey... I did round the LE on my SBB fins. Glad I did. It looks better...more finished.
     
  20. Oct 30, 2018 #20

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
    Sadly, my SBB now lives about 40' up in a pine tree. Ordered some composite G40 motors, went like stink to around 1500'....set the chute release for 300' but the wind caught it and blew it across the field and into the tree. Been trying the past two days to get it down, nothing short of a chainsaw is gonna get it. Damn.
     
  21. Oct 30, 2018 #21

    shreadvector

    shreadvector

    shreadvector

    Well-Known Member

    Joined:
    Jan 19, 2009
    Messages:
    8,666
    Likes Received:
    35
    Rocketus Eatemupus

    https://www.rocketryforum.com/threads/the-scientific-name-of-the-rocket-eating-tree.52717/
     
  22. Oct 30, 2018 #22

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
  23. Oct 31, 2018 #23

    aerojacket

    aerojacket

    aerojacket

    Member

    Joined:
    Feb 2, 2018
    Messages:
    18
    Likes Received:
    2
    Count me in on wanting to see more such PS II offerings from Estes
     
  24. Oct 31, 2018 #24

    DankMemes

    DankMemes

    DankMemes

    Forum Supporter TRF Supporter

    Joined:
    May 15, 2018
    Messages:
    295
    Likes Received:
    35

    Check out the Econojet/Economax line from Aerotech, Single use 29mm wihthout hazmat, up to an F67
     
  25. Oct 31, 2018 #25

    James Duffy

    James Duffy

    James Duffy

    Well-Known Member

    Joined:
    Jan 19, 2009
    Messages:
    735
    Likes Received:
    50
    The fins are much, much easier to finish if all sanding and filling is completed before they are attached to the airframe.

    To echo what others have said here, the Super Big Bertha kit is a great deal of fun to build. I assembled one to present to astronaut Scott Parazynski, who was our keynote speaker at the recent Houston NARCON.

    IMG_3006.JPG IMG_3007.JPG

    James
     
    zog139 likes this.
  26. Oct 31, 2018 #26

    Jozef

    Jozef

    Jozef

    Well-Known Member

    Joined:
    Aug 26, 2014
    Messages:
    236
    Likes Received:
    20
    Gender:
    Male
    Beautiful work, James
     
  27. Nov 1, 2018 #27

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
    SBB has been recovered! Here is it's flight before I put it in a tree, on an Aerotech F50 single use. Man, it goes like stink on a big composite motor....I launched it with a G40 when I lost it, probably went to 2000'

     
  28. Nov 1, 2018 #28

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
    Nice looking bird! Yes, all fin work must be completed prior to mounting. A "jitterbug" palm sander makes short work with rounding the LE, but ya gotta be careful of those fingertips! I papered mine, but only soaked the edges with CA. Ended up with some bubbles in the fin. #2 will get the full soak with some thin CA. They will probably end up tough as plywood!
    I'm absolutely tickled I got #1 back. It lived in that dadblame tree for 4 days, was afraid the rain would move in and destroy it. I ended up bringing it down body first, then the chute, nomex and the JLCR. 50' of 1" pvc pipe in 5' sections with a coat hangar hook duct taped to the end. Snagged the shock cord and twisted until it broke free, then got lucky and snagged the chute. I brought it down to **just** out of my reach, was finally able to get it just low enough to snag the canopy with my free hand. It was all over then, no way that white pine was going to have it any longer!
     
  29. Nov 4, 2018 #29

    scott johnson

    scott johnson

    scott johnson

    Well-Known Member

    Joined:
    Aug 21, 2018
    Messages:
    61
    Likes Received:
    5
    Gender:
    Male
    Super BB on a G40:

     
  30. Nov 5, 2018 #30

    Nytrunner

    Nytrunner

    Nytrunner

    Master of Rivets

    Joined:
    Oct 15, 2016
    Messages:
    3,696
    Likes Received:
    502
    Gender:
    Male
    Location:
    Huntsville AL
    How'd the pipe work out (or how did you prevent flexing)? Even a telescoping fiberglass pole had a ton of flex to it towards the end when I had to do a reach-recovery
     

Share This Page