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I measure the fins and plot them in RockSim using (x,y) format; once you get the base coords for the corner points upscaling is a snap. I have a 4" version of this rocket about 1/2 built. 3/16 ply fins that I cut and beveled, ttw 54mm mount, dual deploy. Vinyl decals from Tango Papa. I'll...

I find it interesting to read the comments regarding whether or not it's necessary to 'glass based on motor impulse. Is this specifically for 4" rockets or what? Isn't the need for glassing determined by the acceleration and velocity of the rocket? The L3 project that I have drafted...

As long as you don't use improperly mixed epoxy that doesn't set up fully (Wood Glue is by *far* the best adhesive to attach that boattail - made of balsa - to a kraft paper tube) - you'll burst the airframe before you eject the boat tail. Just had to chime in on that one. In rough numbers...

I'd just call Deb - rather pleasant and helpful to talk to. FYI - the way PayPal works, the "Payee" (so TRA in this case) has to pay a fee to collect. That's how Paypal makes their money. If you're going to be paying by credit/debit card, and you have access to a Fax machne, I'd fax in...

Hobby Line: Rouse Tech 18/20 24/40 29/40-120 ( x 2 ) "Easy Access" RMS and High Power 29mm Rouse Tech 29/60 29/100 29/120 29/240 (w/Seal Disc) 29/360 (w/Seal Disc) Dr. Rocket 29/180 (**3 sets of closures total**) 38mm Rouse Tech 38/240 38/360 38/480 (w/ seal disc) 38/600 (w/ seal disc)...

:eyepop: https://www.youtube.com/watch?v=gdlvOK9MTtc

Indeed. They just go OOP and get cloned. ;)

Yes, and yes. Good times...

:cool: Understood. There is no such thing as useless data. :) ALL data tells us something - even if what it's telling us is that the source of it is unreliable. :roll: (In other words, we're on the same page, I think. ;) )

Dr. Worsey :cool: He was my academic adviser for my last 5 semesters. What a goofball. :p In a brilliant way, of course. ;)

I don't think this is necessarily true, but that's just me. For instance, a scale model of an air-to-air missile. Or most any guided missile for that matter. By design, guided missiles are on the razor's edge of traditional (hobby) rocket stability. This is so their guidance systems can...

I know this is an oldie, but dad-gum - it's a GOODIE. From Wildman's site, this is my favorite skid video. If you've got good audio on your computer, turn it up. :y: https://www.wildmanrocketry.com/Video/WN05-Drag.wmv

:o ;) I got to digging in some older pics and found some 29mm BlackJack and FastJack pics too. Nice motors. Here's my 228% upscaled Custom Bullet, launch is on an H112J reload. (EDIT: Ok, ok, so that's a 38/380 HPR reload. :roll:) Here's my LOC Onyx on an old G33-7 reload. Love this...

In my experience, the AT BlackJack produces the thickest, densest, darkest smoke. Here's a couple of pics of my Binder Design Excel Plus on an I195J: The BlackMax motors are nice and thick, and the smoke is more gray than black in comparison. BUT: the propellant has a higher...

:y:

:o Go BLUES!!!!!! :confused2:

LOL :cool: I will add that it helps to have a chart of available tube sizes handy - particularly if you are scaling (up!) something with multiple sizes of tubes (motor mount doesn't really count.) Sometimes your first choice of a scale factor can turn out to be impractical - or less...

Mo - S&T will always be UMR to me. Simon Crafts Mining Engineering University of Missouri - Rolla '95 Sorry I can't be any help with FE; but I'm definitely one of those "technical" guys. Numbers are much easier to deal with than people. ;) Now - if you want to calculate stress...

Just curious - why are you worried about a $15 part for a rocket that will cost more than that (much more if you count hardware) for a single launch?

Best idea I've read in a long time. :roll: