Handy reference for scratchers and scalers

[rocketguy101]

I was looking for a reference to create a flat pattern of some nozzle shrouds (my college drafting book is at work). I was trying to create the pattern with my CAD program, but it was blowing up because the shroud is a cone intersected by a tube (think Saturn V F-1 nozzle shroud). I found an excellent book on Google, called Triangulation Applied to Sheet Metal Pattern Cutting (http://books.google.com/books?id=ed9IAAAAMAAJ) -- and it allows you to create some wild flat patterns (round-to-square transitions, anybody?) -- best part its free to download!

[Rocketking]

I found from visiting Essence Model Rocket Reviews www.emrr.com if I remember correctly is http://www.delorie.com/rockets/transitions.html

What's nice is that you can either input BT-sizes Or the actual diameter that you want the finished product to be! That should work well for your nozzles!

His page generates a pdf file which you can print, save for later, etc. What's nice is that it generates all the data & prints it at the bottom of the page, in addition to the cone with the attached 'tab' at one side, or the 'glue-behind' tab at the other side. it also prints a 1" square so you can tell at one measure if the printer is messing things up!

[zrs4]

very cool indeed!!

[rocketguy101]

I found from visiting Essence Model Rocket Reviews www.emrr.com if I remember correctly is http://www.delorie.com/rockets/transitions.html

What's nice is that you can either input BT-sizes Or the actual diameter that you want the finished product to be! That should work well for your nozzles!!

Thanks RK, but I wasn't trying to model a complete 360 conic--I am trying to get a flat pattern for the skirt that goes over the nozzle....see pic

There is another neat tool written by the same guy who wrote VCP--he calls it VCT you can download off the VCP site (http://myweb.cableone.net/cjcrowell/vcpmain.htm). It does a lot more than just conic shrouds.