Model Forum / General / Rockets / April 2007

Is this you Terry?
http://www.matchdoctor.com/profile_terry6969.html

I have written a paper about model rocketry (See "History") and i
would like to share it with all of you. Here's a link:
http://docs.google.com/Doc?id=dht3r9q_334frc7t
and here's the appendix

Check out the video here:
http://www.youtube.com/watch?v=3R_O8vHWSbc
At 10 seconds, you can see the fins appear to flutter significantly.
I seriously doubt the fins could flutter that much without failure.

i think i missed it here.

Binder Design is announcing the release of two new 38mm 3.9" diameter kits!
The first is an upscale of their most popular mid-power kit, the
Dragonfly. This 38mm kit is designed for H and I power, perfect for
those L1 certification attempts.

I'm wondering how people go about sizing Kevlar recovery harnesses. What
seems to be OK from a numbers standpoint seems far too small from an eyeball
evaluation.
The ROT I use goes something like this:

Can anyone offer any tips on working with ALPS decals?
I recently bought a PD Rocketry Gemini-Titan to which I am now
applying the decals.
I found the supplied decals to be very weak and they tear easily.

I cant seem to find out what the KN ratio actually is, So what is it?
I see it ranges from 150 to 300 range, but what exactly is it? Does it
measure something? What does KN stand for? Kilo Newtons?
For example:

Rouse-Tech is pleased to announce their three latest European dealers.
    * Rocket Store Limited un the UK (http://www.rocketstore.co.uk/)
will be stocking both Monster Motor hardware and CD3 ejection systems.
    * Rebel Rocketry in The Netherlands (http://www.rebelrocketry ...

Daily I read the news stories from Lexington and Louisville Ky and
Cincinnati Ohio. This keeps me informed whats going on in this area. So I
came across a story where a person was charged with the following crime in
OHIO:

Hi, im in Australia, and due to my frustration with the availability
of KNO3 (only place i could source it was a chem supplier which
charged 46$ to 500mg, which is still cheaper than those mini 13mm A
rockets which cost 12$ ea over here) im building a liquid rocket, just

I see that there is also a Friday launch day on September 28th 2007.
Is it worth going up on this set up day and shorter (I presume) launch
window?
Rock

***********************************
R107: NAR S&T NEW MOTOR CERTIFICATIONS
The following motors have been certified by NAR Standards & Testing
as general use Model Power Rocket Motors effective March 23, 2007.

Hello all, have two kids into rockets now ( I am a long time aircraft
modeler). We are in the process of scratch building a few simple
rockets right now. Is there a web site that shows the old school way
of figuring out center of gravity and center of pressure? I know there

I've come back to rocketry after about 25 years (it's called having
kids) and found all my old models in my parents' basement. They appear
to be in good condition, but I know some things need work, but not sure
if I've thought of everything.