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  1. #121
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    Quote Originally Posted by billspad View Post
    Wimp. There were no 33 mph gusts but the wind was pretty steady all day. I felt warmer than I did at the 11/8 launch but we did have that heater this time. There was at least one TARC team there and their flight was straight as an arrow. We got off around 175 flights not counting half a dozen at the night launch.
    I say "potato", you say "potaaaato".
    It's all a matter of pronunciation.

    You say "wimp", I say "warm with wife".
    Both are constructed with four letter words beginning with "w".
    As my phrase does it three times as much, I consider it to be the more correct.

    In all seriousness, thank you and all the other great folks at CMASS for another great flying season.

    Looking forward to burning way too many motors doing fun flights at CMASS next year.

    Happy Thanksgiving to all.

    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

  2. #122
    Join Date
    25th January 2009
    Location
    Hudson, MA
    Posts
    411
    Quote Originally Posted by delta22 View Post
    I say "potato", you say "potaaaato".
    Actually, I think he says "puhDAYduh".

    As one who also skipped the launch because of the elements, I don't think that you're a wimp. I think that you are wise. (Another four-letter "w" word.)

    John Buscaglia
    NAR 27366 - L1
    CMASS and MMMSC member

  3. #123
    Join Date
    18th January 2009
    Location
    Saugus, MA
    Posts
    2,627
    Quote Originally Posted by jbuscaglia View Post
    Actually, I think he says "puhDAYduh".

    As one who also skipped the launch because of the elements, I don't think that you're a wimp. I think that you are wise. (Another four-letter "w" word.)
    You're a wimp too.

    There was an advantage to being in the cold all day. I was able to convince myself that I need more caloric intake to make up for what I burned staying warm. I got the cinnamon bun sunday.

  4. #124
    Join Date
    18th January 2009
    Posts
    3,368
    Quote Originally Posted by billspad View Post
    ....I got the cinnamon bun sunday.
    Well of course you did and had it been a warm day, you would have convinced yourself that you needed the ice cream to cool down.
    Bob Harrington
    NAR #62740 L1
    AMA #46042
    CMASS & RIMRA Member

  5. #125
    Join Date
    6th March 2010
    Location
    Amesbury, MA
    Posts
    2,002
    Quote Originally Posted by delta22 View Post
    You say "wimp", I say "warm with wife".
    Hands down, Boris wins. Even factoring in the Cinnamon Roll Sundae.

  6. #126
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    The 12/13/14 RIMRA launch was cancelled due to weather earlier last week.
    While the weather Saturday was very nice for December, there was a lot of rain a few days earlier.
    Wet fields would not do well with traffic.

    So more time to build/repair/upgrade rockets.

    Finished fin repair on HellBoy and re-painted yellow below the flames.
    Paint lines are visible up close, but from 5+ feet (or in photos) looks nice.

    Also removed the 3in diameter tube inside body.
    This had been used as a separate deployment tube for main chute.
    As most flights are between 600-900 feet, going with single deploy at apogee for improved reliability.
    Will use a second backup ejection charge, instead of previous main ejection charge.
    Can see glue line where bottom of 3" tube was in second picture.

    Visible in the second pic as well, the reason one fin (the one at the bottom of the picture) broke twice on recovery, and the others not at all.
    Answer is in the next post....

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    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

  7. #127
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    The larger U bolt is the main chute attachment point.
    As it is off center, the fin at the bottom of the pic is most likely to hit the ground before any other part of the rocket.
    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

  8. #128
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    Got more work done on the LOC 4in V2.

    Sprayed the fins and lower section of the rocket with Krylon Clear Gloss.
    This built a nice shiny clear coat over the 2x layers of thin FG covering rocket.
    The wood grain on the fins is still nicely visible.

    Then taped off fins and some of lower body and sprayed a couple layers of primer and Krylon Sun Yellow.
    I'm not sure I like the angles for the bottom yellow paint lines. May add more yellow later.
    Last pic shows level of gloss in both clear and yellow areas.

    I believe that bright colors make rockets go faster...as well as making them look cool...and more visible in the grass...


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    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

  9. #129
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    Speaking of faster, also did some work and tests on the Carbon Weasel.

    Built up 4x layers of 1.5oz FG over the NC and top half of the 808 camera body.
    This bonded the camera to the NC and formed a smooth transition where they come together.

    The white area at the top of the camera body is paper that was tacked in place before fiberglassing.
    This helped create the smooth transition.

    First picture shows additional paper and clamps used to keep FG at NC tip pointy while curing.
    This was sanded off later and several tiny build-ups of epoxy filled in imperfections in this area.

    Click image for larger version. 

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    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

  10. #130
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    The Carbon Weasel had a problem with deployment on its only previous flight in its current dual-deploy configuration.

    Ejection gasses were getting past the base of the NC and also through the altimeter bay.
    To solve this problem for the main chute, I created a couple small 38mm pistons and a sleeve.
    These are pictured below.

    Sleeves are made from LOC 38mm coupler tube, sanded, wiped with slow epoxy, then sanded again for perfect fit.
    Each (brown) piston consists of a sleeve and an internal 1/8" ply bulkhead.

    Pic 3 shows all pieces:
    1/8" Kevlar line would run through middle of brown pistons and connect NC to alt bay.
    24" TFR thin mil chute sits inside largest piston.
    0.2g ejection charge sits in between small piston above alt bay and larger piston that contains chute.
    More sleeve added at bottom of NC to tighten NC seal.

    Pic 4 shows bulkheads inside pistons.

    Pic 5 shows alt bay/piston/NC assembly as it would be inserted into carbon fiber main compartment, shown next to it.

    Click image for larger version. 

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    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

  11. #131
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    To prevent ejection gasses from escaping at the apogee deployment event:

    Motor seal in body tube was good, only needed to reduce ejection gas flow past bottom of altimeter.
    Found that adding Nomex wadding at alt bay was effective.
    Nomex is taped to ejection charge which is epoxied to alt bay.

    Using these methods, was able to get good ejection ground test results using 0.2g for both events.

    The small 38mm pistons added 0.7 oz to the weight of the rocket.
    The Nomex it replaced weighed 0.6 oz, so net weight gain is only 0.1 oz.

    Click image for larger version. 

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    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

  12. #132
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    MMMSC Launch - 12/20/2014 - Berwick, ME

    Weather was beautiful for December, very low winds, mostly sunny and in the 30's F.
    While the weather at the field was great, drove through light falling snow on the way up and back (southern Massachusetts to southern Maine).
    Due to the long drive and early sunset, only completed two flights.

    First the HellBoy went up on 19x D11-P engines.
    A quiet rush of smoke and flame.
    Fired by flashpan, all motors ignited.
    A fun low and slow flight.

    The Featherweight Raven reported:
    altitude: 772 ft
    speed: 114 mph
    acceleration: peak 9 Gs, 3-4 Gs for most of burn

    The recovery tweaks previously noted worked well.
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    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

  13. #133
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    Then sent the Carbon Weasel up fast.
    It ended up being the last flight of the launch.

    Rocket is minimum diameter 38mm, 16 oz without motor.
    Sent it up on a 3grain 38mm CTI I236 blue - 14 oz motor
    1.8 lb rocket with 53 lbs of thrust for 1.75 seconds...

    Flight went perfectly, streaking straight into the sky and doing a clean dual deploy recovery.
    Broke mach in 1.2 seconds at about 900 ft.

    Featherweight Raven reported:
    altitude: 6370 ft
    speed: 884 mph = MACH 1.15
    acceleration: 40G peak, ~30G average

    Two minutes after liftoff, the rocket came back down not far from the pad.

    Highest and fastest flight I've done so far with onboard electronics.
    Slightly higher and faster than RockSim predicted.

    Only managed two pictures that included the rocket, the others just show smoke trail...
    First pic is about 0.5 sec into flight @ 400 mph
    Second pic is at 1.5 sec @ 800+ mph @ 2500+ ft
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    Last edited by delta22; 4th January 2015 at 08:32 PM.
    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

  14. #134
    Join Date
    22nd October 2013
    Posts
    692
    Nice!

  15. #135
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    The data provided by the Featherweight Ravens in awesome.

    First pic is Carbon Weasel flight through apogee deployment.
    Data line and box show max velocity of 884 mph at 3000 ft at 1.75 second motor burnout.

    Second pic is first four seconds of this flight, to see more detail.
    Data line and box show where rocket accelerates through mach.

    Several interesting things visible in pic two:
    > Speed line shows increased air drag above mach
    > Rocket briefly experiences 17 Gs of deceleration after motor burnout
    > Acceleration and altitude (air pressure) lines show significant distortions at mach

    Last pic is the low and slow HellBoy flight data.
    Quite a contrast between these two I powered flights...
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    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

  16. #136
    Join Date
    23rd July 2014
    Location
    Massachusetts
    Posts
    836
    Very nice flights. Can't wait to see what you have planned for next year.
    NAR# 98194
    Level 1: CTI I-216, 3,043'
    Level 2: CTI K-740, 5,999'

    Personal altitude record: 12,400' CTI L395
    2014 total impulse: 9,018.2 Ns (76% M)
    2015 total impulse: 7,171.7 Ns (40% M)
    2016 total impulse: 18,664.2 Ns (91% N)
    2017 total impulse: 8,281.1 Ns (80% M)

  17. #137
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    Thanks

    Got the video edited.
    Included Jason L's very cool Ultimate Darkstar on an M Skidmark

    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

  18. #138
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    For a variety of reasons, I never edited or posted most of the rocketry video I took last year.

    This video starts with a short clip of my son Paul's TARC team in action and then covers:
    > 15 rocket launches
    > burning over 90 motors




    Last edited by delta22; 30th December 2014 at 05:03 AM.
    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

  19. #139
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    This video covers 3 launch dates including the

    US vs. USSR HP clustered drag race

    plus several other HP and / or clustered flights

    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

  20. #140
    Join Date
    21st January 2009
    Location
    Massachusetts
    Posts
    1,015
    At the end of the season CMASS does a fun

    NIGHT LAUNCH including two Turbine Rocket Saucer night flights


    Boris Katan
    NAR / TRA L3
    Lots of fun cluster rocket pictures and video at: www.bpasa.com

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