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On a side note: The military has more experience with this type of "late recovery".

Source: https://en.wikipedia.org/wiki/B61_nuclear_bomb#Design

Given the sounds our parachutes often make on...

Depending on how you look at the problem, this can be wrong. The dissipated power is drag times speed. If one compares two rockets at the same speed, with different levels of drag, then the rocket...

You can also tweak the motor file, until the acceleration curve from your simulation matches your Raven data. This should give you a rough approximation of actual motor performance.

Reinhard

You are probably thinking about Troy Prideaux and his device:
http://www.ausrocketry.com/forum/viewtopic.php?f=9&t=2043&start=60


One day, I'd like to build a minimum diameter rocket with rear...

I haven't succumbed to the dark side yet, so I'm more interested into the regular version. That is, unless Darth Dudu corrupts my poor soul this weekend...

Reinhard

Good idea. Let's have a chat this weekend.

Reinhard

The seven deadly sins of rocketry, number 6: Tool Envy.

Reinhard (who is also strong in the "build sloth" department)

I guess they will do the same thing that the Navajo code talkers did during WW2. Their language didn't have words for many relevant military concepts, so they used synonyms. For example, they used...

Here are a couple other ones. In some of them, the humor may be a little edgy for TRF standards.

http://dilbert.com/strips/comic/2004-08-15/
http://dilbert.com/strips/comic/2012-06-19/...

The current version of Java is Java 7 Update 21. Vulnerabilities in older Java versions are often exploited to infect computers, so it is advisable to update it. When installing the update, I'd...

Erosive burning might make a difference for the observer on the ground. It increases the thrust early during the burn. The motor designation doesn't reflect this very well. If we consider two...

The dynamic pressure at Mach 3.2 is about 7 times as high as the ambient pressure. So as a rough approximation, below ~45kft altitude the internal pressure of an unvented compartment should not be...

With one exception: Don't use solvents to remove epoxy from your skin. This can help the epoxy to penetrate your skin and increases the risk of developing an allergy to epoxy.

Reinhard

Carbon fiber sheets can't be easily cut with lasers. The fiber it self has a very high melting point, but the glass temperature of the epoxy matrix is much lower. If you throw enough power on it to...

A H242T on my L1 flight.

Reinhard

I agree. In our case, some 5V components prevented us from going this route. This was particularly bad, because most of our current draw happened at 3.3V (up to 800mA, just from the XBee-Pro 868...

One observation, it looks like you are using a linear regulator in a SOT-23 package. In a somewhat similar device (NL-552ETTL GPS, XBee-Pro 868, AVR and a couple of sensors), that I'm involved, we...

Should you happen to make a stop in Vienna, take a look at the Heeresgeschichtliches Museum (the German Wikipedia entry contains much more pictures). It shows mostly older stuff from the Empire days....

I haven't done it myself so far, but the instructions in the Wiki look like a good start to me (disclaimer: I know next to nothing about Java).

First, I assume you have already read this:...

Try Youtube. There are lots of SMD soldering tutorials. Depending on the part in question the difficulty level as anywhere from "Piece of cake" to "Impossible" ;-)

Reinhard

Drilling from the bottom has some advantages. The delay gets better supported against the forward closure, especially when the delay is shortened by a lot and a big drill is used. There is also less...

This is one example:



Source: http://www.momentive.com/products/technicaldatasheets.aspx?id=3509

The details are most probably very specific to the particular product in question.

Reinhard

Have you been a TRA member previously? My number is 10691 and I joined in 2005 (IIRC).

Reinhard

Hoschton is in the Eastern Time Zone and Memphis is in the Central Time Zone. The scans are apparently in local time, so the actual time traveled would be 1 hour longer then.

However, it looks...

This is also my assumption. I'm not proposing something else - just an optimization of the internal airflow (assuming this is an effective optimization).

Reinhard

The Arduino is one of the easiest ways to build a simple recording and telemetry system, as long as no camera is involved. A RaspberryPi will work also and can handle video too. Video has much higher...

The problem, as I understand it, is that it is unclear if NAR insurance will cover the hosting club and its officers if the event clearly doesn't follow the NAR codex. At the same time, TRA insurance...

This is not what I had in mind. I was thinking only about a connection between the fan and the heater. There would still be an open space between the fan and the inner wall of the oven, where air...

You could try some basic duct work to control the air stream. I guess that even a short piece of tubing, that just connects the fan with the heating element, might make a difference.

Reinhard

The delay grain in the G69N is only used as mechanical support and to seal the forward closure. With the later W9 end burning motors, AT introduced a new closure that doesn't need a delay grain.
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