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  1. #1711
    Join Date
    22nd January 2009
    Location
    Plano, TX
    Posts
    2,883
    Quote Originally Posted by ActingLikeAKid View Post
    Launching two DMS motors this weekend. Both were purchased this year from Apogee.
    Is the thrust ring advisory still a concern?
    https://www.apogeerockets.com/downlo...ng_Advisor.pdf

    If so, should I be OK with a healthy bead of CA?
    They're probably good.
    I always check every DMS with a good strong twist on that thrust ring. Then some thin CA. Cheap insurance.


  2. #1712
    Join Date
    31st May 2011
    Location
    San Diego, CA
    Posts
    2,435
    Have a J450-DM on order , normally would get the K456-DM at that price point but trying this in a much smaller rocket ..it is the right fit this time around .

    Also in the hopper have a J180T ..this motor did not stand out to me on the price list as I glanced down .. you know, there is the White Lightning one, there is the red one , there is the long burn .. and WatersH20 told me that it has a 4.5 second burn time .. so bought it and will fly it when weather is good .

    Kenny

    Fiesta Area Rocket Team - San Diego, CA

    TRA# 01113 L3, NAR # 38484 -DART, NAR Section #317
    GHS 2011 PB-X ROCstock XXXV GHS 2012 PB XI ROCstock XXXVII PBXII SPRINGFEST 2014 ROCstock XXXIX Oktoberfest 2014 LASTER Blaster ROCstock XL SPRINGFEST 2015 ROCstock XL1 ROCtober Oktoberfest 2015 LDRS XXXV ROCstock XLIII Holtville HAVOC Springfest 2017 --> ROCstock XLIII :dark:

  3. #1713
    Join Date
    9th October 2013
    Location
    San Jose, CA
    Posts
    536
    Quote Originally Posted by KenRico View Post
    Have a J450-DM on order , normally would get the K456-DM at that price point but trying this in a much smaller rocket ..it is the right fit this time around .

    Also in the hopper have a J180T ..this motor did not stand out to me on the price list as I glanced down .. you know, there is the White Lightning one, there is the red one , there is the long burn .. and WatersH20 told me that it has a 4.5 second burn time .. so bought it and will fly it when weather is good.
    Heh. Apparently I'm just a bit ahead of you time-wise. I flew a J180T on 4/1, and picked up a J450DM last weekend. The J180T was nice, only problem was that my undrilled -L delay went off ~7s after burn-out instead of the 14s target. Apogee was supposed to be ~11s after burn-out, so I was shooting for a motor backup for an electronic eject, instead it cut the flight short by around 600'. FG & kevlar though, so no damage, just not quite the flight I was hoping for.
    Will Ferry (Launches & Videos) NAR #96512 (L2) / TRA #15328 (L2) / LUNAR #2759
    L1: 9/2013 @ XPRS, GLR T-Bolt "Thunderbolt" (R.I.P.), H148R
    L2: 4/2016 @ TCC Helm, Binder Design Excel w/DD "dd2.xls", J315R
    Impulse flown (flights): 2013: 767Ns (2), 2014: 4298Ns (8), 2015: 7486Ns (16), 2016: 11695Ns (18), 2017: 4852Ns (6)

  4. #1714
    Join Date
    31st May 2011
    Location
    San Diego, CA
    Posts
    2,435
    Quote Originally Posted by woferry View Post
    Heh. Apparently I'm just a bit ahead of you time-wise. I flew a J180T on 4/1, and picked up a J450DM last weekend. The J180T was nice, only problem was that my undrilled -L delay went off ~7s after burn-out instead of the 14s target. Apogee was supposed to be ~11s after burn-out, so I was shooting for a motor backup for an electronic eject, instead it cut the flight short by around 600'. FG & kevlar though, so no damage, just not quite the flight I was hoping for.
    GMTA .. had already done a number of my Bucket List motors , but not ready to buy some new hw for the long burns .

    Sorry the delay cut your coast altitude . Glad you had a strong bird in the air ! When I first flew Dual Deploy I always had no motor backup as a friend told me 'you either trust your electronics or you don't ' ...then the same guy told me a few months later 'motor deploy can't hurt' - so I did have a delay cut me short abit , but also at least one flight was saved by it as I didn't have redundant electronics .

    Kenny
    Fiesta Area Rocket Team - San Diego, CA

    TRA# 01113 L3, NAR # 38484 -DART, NAR Section #317
    GHS 2011 PB-X ROCstock XXXV GHS 2012 PB XI ROCstock XXXVII PBXII SPRINGFEST 2014 ROCstock XXXIX Oktoberfest 2014 LASTER Blaster ROCstock XL SPRINGFEST 2015 ROCstock XL1 ROCtober Oktoberfest 2015 LDRS XXXV ROCstock XLIII Holtville HAVOC Springfest 2017 --> ROCstock XLIII :dark:

  5. #1715
    Join Date
    22nd January 2009
    Location
    Hurdle Mills NC 27541
    Posts
    3,248
    J180 requires special hardware. Standard 54/852.
    Jim Scarpine
    Underboss of The Carolina Rocket Mafia
    Tripoli NC
    TRA 1377 NAR 51510
    L3 TAP L3CC


    ICBM
    VAST
    QCRS
    Indiana Rocketry
    ROSCO
    Chicago Rocket Mafia


    www.starleopardrocketry.us

  6. #1716
    Join Date
    26th February 2012
    Location
    Poultney , Vt
    Posts
    798
    Quote Originally Posted by jimzcatz View Post
    J180 requires special hardware. Standard 54/852.
    What Jim meant was " requires special hardware ( extended forward clouser ) if using motor deployment .
    You must always push your limits , because if you never fail , you will never succeed .

  7. #1717
    Join Date
    22nd January 2009
    Location
    Hurdle Mills NC 27541
    Posts
    3,248
    No I didn't spell check. I apologize profusely. The J180 DOES NOT require any special hardware. It does not need the extended forward closure, just a standard 54/852. I have burned probably 6 of them I'm my years. Once again I apologize for the confusion, I should never have let that one get by me.
    Jim Scarpine
    Underboss of The Carolina Rocket Mafia
    Tripoli NC
    TRA 1377 NAR 51510
    L3 TAP L3CC


    ICBM
    VAST
    QCRS
    Indiana Rocketry
    ROSCO
    Chicago Rocket Mafia


    www.starleopardrocketry.us

  8. #1718
    Join Date
    11th October 2016
    Posts
    64
    I have gone to the stainless disc no matter what 98mm load. True it was intended for the Super Thunder Propellants but seems like cheap insurance especially when seeing the above pictures. During LDRS I used them on an N2000W, M1075DM, M4500ST, M2000R, M2400T. No signs of fatigue on any.

  9. #1719
    Join Date
    11th October 2016
    Posts
    64
    Quote Originally Posted by beezwax View Post
    I flew my first 98mm motor this weekend-- AT's N1000 in the 98/15360 hardware. The motor casing and all components were brand new, so I was really surprised when I was cleaning up afterward to see that the forward seal disc had a chunk missing from the inside edge. Thankfully there was no failure and I had a perfect flight and recovery, but obviously this seal disc cannot be used again. I have never had a forward seal disc get damaged in flight before on any smaller motors including 75mm. Question for Charlie or those with experience-- have you seen this before? Is this normal wear and tear with these giant motors or did I get a bad copy?
    Reposting because I should have include the original message.

    I have gone to the stainless disc no matter what 98mm load. True it was intended for the Super Thunder Propellants but seems like cheap insurance especially when seeing the above pictures. During LDRS I used them on an N2000W, M1075DM, M4500ST, M2000R, M2400T. No signs of fatigue on any.

  10. #1720
    Join Date
    19th January 2009
    Location
    Tucson, Az
    Posts
    2,261
    It might be a good option to have on smaller cases also. I have seen a number of seal disks eaten by the 54mm K1103X reload.

    more rockets then cents

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