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  1. #31
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    Got the tee-nuts installed in the aft centering ring, and sanded the rail button blocks flush. I also marked the fin slots. Those wrinkles are bad,
    but I don't know if they're bad enough to warrant buying another $50 body tube. I don't think they'll cause any structural weakness, especially with the added strength from the motor mount and fins.

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    NAR 91107, Level 2

    I really, really hate bugs.

  2. #32
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    I had a length of 38mm Blue Tube motor tube leftover from something, so I decided to use it. I got the forward centering ring epoxied to it, and the motor mount epoxied into the body tube.

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    NAR 91107, Level 2

    I really, really hate bugs.

  3. #33
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    Finally got the fin slots cut. That LOC airframe is some thick stuff. I need a better knife. I also sanded the fins a little bit, the tabs weren't quite long enough.
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    NAR 91107, Level 2

    I really, really hate bugs.

  4. #34
    Join Date
    25th June 2014
    Posts
    850
    Looks great so far. Those wings are really, REALLY big.

  5. #35
    Join Date
    18th January 2009
    Location
    Urff
    Posts
    6,842
    I'm really looking forward to seeing this behemoth fly.

    Next up...BRUTUS!!
    Cranky Kong, L2 Certified Rocket Monkey
    "But we were promised jet packs!"

    Total Impulse in 2018: 1,402.35 Ns (Equivalent to a 10% K motor.)
    Total Impulse since 2010: 15,274.46 Ns (Equivalent to a 49% N motor.)

  6. #36
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    Yeah, Bluto has become Popeye without spinach. He's still sitting here in my garage, getting dustier and dustier, and I see him everyday. But I'm at the point where I prefer big dumb rockets. I just have no desire to mess with electronics, other than the Chute Release. My original goal with Bluto was to have two air started H motors (which means a timer), and a central K. I do have the timer and two altimeters for him, but when I started installing the altimeters, I got a little overwhelmed. Plus, I'd have to create a compartment for the timer. Then there are the shear pins and ground testing. I just don't have the energy or desire for it all. I've thought about simplifying things and launching it single deploy with the Chute Release, but that would be a lot of volume for motor deploy. I know I could easily add BP if needed, and ground testing would be minimal. I've also thought about using air starts with motor deploy (I really like the idea of the air starts). And then there's the cost of the motors. One K and two H's would be at least $160, and that's for one flight. I do already have the motor hardware, though.

    So yeah, he still sits in my garage.
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    NAR 91107, Level 2

    I really, really hate bugs.

  7. #37
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    Got the fins epoxied on. You know, that fin alignment guide has got to be the best thing I ever made for rocketry. It has really served me well.
    I also got the internal fillets done, and started on the external fillets.
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    NAR 91107, Level 2

    I really, really hate bugs.

  8. #38
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    She is much bigger than I expected! I'm not compensating...
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    NAR 91107, Level 2

    I really, really hate bugs.

  9. #39
    Join Date
    22nd July 2011
    Location
    Where ever the the boss sends me...
    Posts
    2,807
    Awesome sauce!! Looks great Cap'n!
    Terry

    NAR L1
    L2 is on hold, maybe never

  10. #40
    Join Date
    20th February 2009
    Location
    Cayuga, Indiana
    Posts
    12,882
    Quote Originally Posted by T-Rex View Post
    Awesome sauce!! Looks great Cap'n!
    Awesome susckkks... Really, are you a female commercial stand in?

    From the Ether...
    L3, TRA #11847
    Tripoli Indiana #132
    Tripoli Central Illinois #59
    Central Illinois Aerospace (NAR) #527
    Chicago Rocket Mafia, "Big Bucks" Dixon
    ___________________________________

    Quiet little voices creep into my head. -- We Were Promised Jetpacks

  11. #41
    Join Date
    29th October 2009
    Location
    Cuyahoga Falls,Ohio
    Posts
    1,209
    Quote Originally Posted by qquake2k View Post
    She is much bigger than I expected! I'm not compensating...
    Looks like your shrinking next to that big girl.lol

  12. #42
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    Quote Originally Posted by T-Rex View Post
    Awesome sauce!! Looks great Cap'n!
    Thanks Terry!

    Quote Originally Posted by cjp View Post
    Looks like your shrinking next to that big girl.lol
    Well, I am shorter than I used to be...
    NAR 91107, Level 2

    I really, really hate bugs.

  13. #43
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    I had to make another centering ring and the baffle, both to fit inside the coupler.
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    NAR 91107, Level 2

    I really, really hate bugs.

  14. #44
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    I drilled the vent holes in the baffle with a 1/2" Forstner bit.
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    NAR 91107, Level 2

    I really, really hate bugs.

  15. #45
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    I drilled the holes in the baffle for the 5/16" u-bolt, and made the backing plate out of 1/8 x 2" aluminum bar. I'll have to trim the plate a little bit.
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    NAR 91107, Level 2

    I really, really hate bugs.

  16. #46
    Join Date
    18th January 2009
    Location
    Urff
    Posts
    6,842
    Quote Originally Posted by qquake2k View Post
    Yeah, Bluto has become Popeye without spinach. He's still sitting here in my garage, getting dustier and dustier, and I see him everyday. But I'm at the point where I prefer big dumb rockets. I just have no desire to mess with electronics, other than the Chute Release. My original goal with Bluto was to have two air started H motors (which means a timer), and a central K. I do have the timer and two altimeters for him, but when I started installing the altimeters, I got a little overwhelmed. Plus, I'd have to create a compartment for the timer. Then there are the shear pins and ground testing. I just don't have the energy or desire for it all. I've thought about simplifying things and launching it single deploy with the Chute Release, but that would be a lot of volume for motor deploy. I know I could easily add BP if needed, and ground testing would be minimal. I've also thought about using air starts with motor deploy (I really like the idea of the air starts). And then there's the cost of the motors. One K and two H's would be at least $160, and that's for one flight. I do already have the motor hardware, though.

    So yeah, he still sits in my garage.
    Bluto, not Brutus...Iím old and forget details and other things like...um...never mind.

    Not often you see an av-bay the size of a water heater.

    And you would probably need a full fledged retrieval crew to haul Bluto back to the truck.
    Cranky Kong, L2 Certified Rocket Monkey
    "But we were promised jet packs!"

    Total Impulse in 2018: 1,402.35 Ns (Equivalent to a 10% K motor.)
    Total Impulse since 2010: 15,274.46 Ns (Equivalent to a 49% N motor.)

  17. #47
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    Quote Originally Posted by o1d_dude View Post
    Bluto, not Brutus...Iím old and forget details and other things like...um...never mind.
    I'm with you on that one, brother.

    Quote Originally Posted by o1d_dude View Post
    Not often you see an av-bay the size of a water heater.
    It does have quite a bit of volume.

    Quote Originally Posted by o1d_dude View Post
    And you would probably need a full fledged retrieval crew to haul Bluto back to the truck.
    Naw, Olga is tough. She's ex-KGB and even carries a switchblade. She could carry Bluto.

    I actually did some playing around with sims. He would hit about 2000' on a K456 Dark Matter, and about 2600' on a K550 White Lightning. Both motors are $113. Like I said, I do already have the hardware, except for a forward seal disc. The K456 needs the disc, the K550 does not.
    NAR 91107, Level 2

    I really, really hate bugs.

  18. #48
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    Got the half-moon baffles made and installed.
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    NAR 91107, Level 2

    I really, really hate bugs.

  19. #49
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    Fixed the backing plate.
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    NAR 91107, Level 2

    I really, really hate bugs.

  20. #50
    Join Date
    31st May 2017
    Location
    Houston, TX
    Posts
    209
    Enjoying watching this one! Love Bertha / Betty upscales. Want to make my own but the nose cone is a killer.
    TRA #17256
    Tripoli Houston
    L1 - 7/8/17

  21. #51
    Join Date
    5th December 2013
    Location
    MD
    Posts
    7,371
    Looking good so far.

    John S. ---- NAR #96911 ---- TRA #15253 ---- MDRA #067 ---- BARC #028
    L1, 3/15/14: Aerotech Sumo, CTI H133BS
    L2, 6/21/14: Giant Leap Vertical Assault, CTI J240RL
    L3, 3/12/16: MAC Performance Radial Flyer, CTI M1101WH
    Altitude: 13,028', L3 flight; Speed: Mach ???, L3 flight

  22. #52
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    Quote Originally Posted by viciouspeanut View Post
    Enjoying watching this one! Love Bertha / Betty upscales. Want to make my own but the nose cone is a killer.
    Performance has fiberglass elliptical nose cones. I used a 4" on my Jersey Bomber.

    https://performancehobbies.com/secur...px?groupid=200
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    NAR 91107, Level 2

    I really, really hate bugs.

  23. #53
    Join Date
    25th June 2014
    Posts
    850
    Is she looking good for the 2nd?

  24. #54
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    No, I won't have Betty ready in time. I'll have to wait until January. I will be launching Thump In My Down, though. His first flight.
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    NAR 91107, Level 2

    I really, really hate bugs.

  25. #55
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    Finally got some work done on Betty. I installed the centering ring in the coupler, and covered the u-bolt nuts with epoxy. Then got the baffle epoxied in.
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    NAR 91107, Level 2

    I really, really hate bugs.

  26. #56
    Join Date
    29th October 2009
    Location
    Cuyahoga Falls,Ohio
    Posts
    1,209
    Quote Originally Posted by qquake2k View Post
    Yeah, Bluto has become Popeye without spinach. He's still sitting here in my garage, getting dustier and dustier, and I see him everyday. But I'm at the point where I prefer big dumb rockets. I just have no desire to mess with electronics, other than the Chute Release. My original goal with Bluto was to have two air started H motors (which means a timer), and a central K. I do have the timer and two altimeters for him, but when I started installing the altimeters, I got a little overwhelmed. Plus, I'd have to create a compartment for the timer. Then there are the shear pins and ground testing. I just don't have the energy or desire for it all. I've thought about simplifying things and launching it single deploy with the Chute Release, but that would be a lot of volume for motor deploy. I know I could easily add BP if needed, and ground testing would be minimal. I've also thought about using air starts with motor deploy (I really like the idea of the air starts). And then there's the cost of the motors. One K and two H's would be at least $160, and that's for one flight. I do already have the motor hardware, though.

    So yeah, he still sits in my garage.
    Really like fin design on this bird Jim.Can't wait to see those pictures of the launch.I agree with the cost of high power motors plus the hardware $$$$$$$$$$

  27. #57
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    For years I've used pieces of ABS pipe to set the position of bulkheads, and keep them level. Cutting them square has always been an issue for me.
    I finally figured out that if I use couplers, the ends will be square regardless if the ends of the pipe aren't quite square. Using that method, I epoxied the bulkhead in at 12" from the top.
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    NAR 91107, Level 2

    I really, really hate bugs.

  28. #58
    Join Date
    22nd July 2011
    Location
    Where ever the the boss sends me...
    Posts
    2,807
    Quote Originally Posted by qquake2k View Post
    For years I've used pieces of ABS pipe to set the position of bulkheads, and keep them level. Cutting them square has always been an issue for me.
    I finally figured out that if I use couplers, the ends will be square regardless if the ends of the pipe aren't quite square. Using that method, I epoxied the bulkhead in at 12" from the top.
    Great idea! Took looking at the photo for me to understand what you were saying (I am also just getting started on the first cup o java....)
    Terry

    NAR L1
    L2 is on hold, maybe never

  29. #59
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    I realized that it's the sides of the pipe that keep the couplers square, not the ends.
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    NAR 91107, Level 2

    I really, really hate bugs.

  30. #60
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,458
    Using the retainer to set the depth, I got the aft centering ring epoxied in. And using JB Weld, attached the retainer.

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    NAR 91107, Level 2

    I really, really hate bugs.

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