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  1. rocketguy101

    Strange Oscillation In Flight

    Just out of curiosity, have you plotted the "Angle of attack and orientation vs. time" using wind conditions similar to the actual flight for the different motors you listed? Combining the vertical and lateral orientations might show the coning??
  2. rocketguy101

    Stability - percent rule original source?

    I have never heard of a static margin ROT based on % length. I see mention of "center of pressure eccentricity" in "Exterior Ballistics of Rockets" by Davis, Follin, and Blitzer (1958) which is the ratio of CP to length of the rocket. They mention more as an observation than a rule of thumb to...
  3. rocketguy101

    CoP simulation comparison, including CFD

    I was just curious what the surface pressure plot on the windward and leeward sides looked like. I marked up your diagram from earlier. I've long been curious about Openfoam when a colleague at work recommended it. I'm not a Linux user, and tried to run a bootable Ubuntu session but could not...
  4. rocketguy101

    CoP simulation comparison, including CFD

    Nice work! Is it possible with the software to get a plot of the surface? When I was in college, I was a CO-OP student at the university wind tunnel. We ran tests for an airplane company that was experiencing stall on their flaps during landing. The techs mixed up diesel and some black...
  5. rocketguy101

    CoP simulation comparison, including CFD

    Would surface pressure plots show the stall on the fins? This is really juicy stuff!
  6. rocketguy101

    Converting to micro rail - any issues with binding?

    I had similar issues, discussed in this thread
  7. rocketguy101

    ANNOUNCEMENT: OpenRocket 23.09 is now available for download

    Any chance of adding the ability to round the corners of free form fins? Input the corner points, then select those points and change to a radius that adds in the new points? This is handy in Rocksim (RS_Fin-02.jpg). Bonus points if you add an "svg" output so they fin pattern can be laser cut...
  8. rocketguy101

    D Region Tomahawk markings.

    The decal sheet on JimZ page appears to be the red/brown painted sections of the rocket. I don't think there are any markings. The "Thiokol" logo doesn't seem to be in the photos of the real round, despite the Estes instructions showing applying it near the fin area. I build a CMR D-Region kit...
  9. rocketguy101

    AeroTech Open Thread

    Bob wrote several history posts on Ye Olde Rocket Forum...this might be of interest...
  10. rocketguy101

    Missing F-35 Fighter...

    Seeing the headlines today reminded me of the F-117 display at the "Boneyard" across the road from the Pima Air and Space Museum in Tucson...
  11. rocketguy101

    Estes Leviathan charcoal grey metallic paint rec - Duplicolor?

    I painted mine with Duplicolor BGM0536 "Gunmetal Met" (83 WA8915) I also used it on my Big Daddy nose
  12. rocketguy101

    Laser / CNC Laser cutting power levels.

    I bought an xTools D1 Pro, and they sent a file with a matrix of various %Power and Speeds. You put your material in, run that file, then you can choose which setting for that material works for you. There was a matrix for cutting, engraving and scoring. That file is in their proprietary...
  13. rocketguy101

    Calling All Talented "Photo Scalers" . . . I Need More Eyes - NIKE-TOMAHAWK 18.26 IA !

    Here's what I came up with, using your posted photos. I first used MB-Ruler, a handy tool for measuring photos, then I brought them into SolidWorks and scaled them to 9" dia. I got nearly the same dimensions between MBR and SWX.
  14. rocketguy101

    Calculating force from drop test to determine strength of 8-32 thread

    If I understand your original question, you are trying to determine the maximum force that deformed your eye bolt? I assume it was a bent open style similar to this? What material was the eye bolt made from? You could calculate what force it would take to cause the eye bolt to yield (need the...
  15. rocketguy101

    Strong, lightweight material to patch LARGE hole in balsa?

    you might be able to use epoxy and glass beads.** I don't recall where I got this, Dave Bucher posted the technique either on Info-Central or Facebook, but I used it to fix the tip of a fin that broke off during a hard landing. The end result was semi-flexible, which you might not want for a...
  16. rocketguy101

    Spiral thought

    Check out the SKUA, October 1970 Model Rocketry magazine, pg 15 :D
  17. rocketguy101

    FSI motors

    Here is a scan of a 1991 FSI catalog with some thrust curves...
  18. rocketguy101

    In praise of the sanding stick

    I posted this in the "Gizmos" thread ... pretty neat tool! PVC half round sanding tool
  19. rocketguy101

    RASAero II Comparison with MESOS 293K ft Flight Data Posted in Advanced Rocketry Topics - Staging, Airstarts & Clusters

    Very cool! I posted that link here for convenience... edit: N/M now the link shows up in your OP... sorry, but still cool anyway!
  20. rocketguy101

    Gizmos & Gadgets Gallery

    I know this is an old thread, but I came across this video clip for a round sanding tool. I clipped just the portion for the tool. Different sizes of PVC could be just the thing for sanding the ID of tubes, couplers, and centering rings... I have wrapped sandpaper around a dowel and/or used...
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