Taking a Look at the New AeroTech RMS-EZ Reloads

AeroTech has recently released the first loads in the RMS-EZ line of reloads, the I161W-14A, The I357T-14A, and the I211W-14A. These reloads are the first to feature the new RMS-EZ all-in-one delay system which promises to reduce errors and simplify the building of these reloads.

Sirius Rocketry has received stock of these reloads and has them in our hands, so let's take a look!

The RMS-EZ reloads are packaged in same type of packaging as the newer AeroTech DMS (Disposable Motor System) single-use motors. Like the DMS motors, the RMS-EZ reloads have a label with motor information and a thrust curve on the outside of the tube. Inside, a bag holds all the reload parts. 

Our example for today is the I211W-14A reload, a four-grain White Lightning motor for the 38/480 case, or larger cases with the use of the Reload Adapter System (RAS). One particular part of the Reload Adapter System is very handy to have, for reasons we will see in a little while. When we open the bag, we get the typical reload parts, instructions, and a smaller bag of parts.

Most of these parts are the same as will be found in a typical RMS-Plus reload kit. You have (from top-to-bottom, left to right): liner tube, propellant grains, FirstFire igniter, aft o-ring, forward o-ring, aft insulator, forward seal disk o-ring (in motors that require it) or a forward insulator, nozzle, nozzle cap, ejection charge plug, ejection charge powder and the new RMS-EZ modular bulkhead.

This is the new RMS-EZ modular bulkhead, taking the place of most of the standard forward closure assembly. It incorporates a 14-second delay, adjustable with the use of the Universal Delay Adjustment Tool (UDDT).

A view of the rear of the bulkhead shows the 14-second delay train already potted in place, eliminating many of the delay parts from the assembly of the forward closure in standard RMS-Plus reloads.

A view of the front of the bulkhead shows the front of the delay grain and the ejection charge well This is the end with the tap hole where you would drill the delay grain to the proper delay needed.

The Universal Delay Drilling Tool is used to drill the delay down to the required length in two or four second increments.  The tool, like the two other tools for the RMS motors that are available use a 1/16" washer to space for certain 2-second increments.  A 1/32" washer could be substituted if necessary for even finer control in 1-second increments.

Similar to LMS motors and many reloads, the reload includes a plug to retain the ejection charge.  After drilling your delay to the required length, you add your ejection charge powder, and retain it by pushing the internally-installed red vinyl cap down into the ejection well. Gone are the days of paper discs retaining ejection charges, large hard red caps, or amazing tricks with masking tape!

The RMS-EZ uses all the standard RMS casings, and the standard rear closures, but since most of the standard function of the forward closure is now duplicated by the new RMS-EZ modular bulkhead, you can put your standard RMS forward closures aside. You will need the Forward Closure Retaining Ring out of your Reload Adapter System (RAS). The RMS-EZ molded modular bulkhead is very much like the Floating Forward Closure in the RAS, and can be used in the same way with longer casings and the RAS grain spacers.

If you do not already have a RAS Forward Closure Retaining Ring, these are also available separately.

The forward end of a RMS Casing showing how the Forward Closure Retaining Ring is used to retain the RMS-EZ modular bulkhead.

The RMS-EZ modular closure with its integrated 14-second delay and the Forward Closure Retaining Ring at the left take the place of the (at right): Standard forward closure, delay spacers of various lengths for various delays, delay grains of various lengths for various delays, delay insulators, delay o-rings and delay washers.


The first reloads to be offered in the line include the I161W-14A, I357T-14A (fits RMS-38/360 hardware) and I211W-14A (fits RMS-38/480 hardware). The traditional RMS-Plus style of reloads remain available for these motors while stock lasts, as AeroTech transitions from the old style to the new style EZ motors on these items.

AeroTech also says that additional RMS-EZ reload kits are under development including those in 29mm and 54mm diameter.

The new RMS-EZ system, with less parts to worry about helps to eliminate much of the assembly of the RMS motor at the delay end where most of the mistakes seem to be made. Less parts at the delay end means fewer delay train errors and faster assembly, and faster assembly time means more flying time on the field!

A huge selection of in-stock AeroTech Hobby Line and High-Power rocket kits, motors and supplies are available along with thousands of other great rocketry products from the world's finest hobby rocketry manufacturers at the Sirius Rocketry Online Store. 

Welcome!

The Sirius Rocketry Saturn V on an AeroTech I284.

Welcome to the Sirius Rocketry Blog!

Hello everyone! 

Dave from Sirius Rocketry here.  Sirius Rocketry has  been around for 14 years now (really - has it been that long?), and we have really enjoyed the friends we have made over the years.  This new Sirius Rocketry blog will be one of the many ways we can talk with our favorite people - our customers.

Every day I come across interesting rocketry stories, new product information, real-space exploration news, news on what my rocketry friends are doing and more.  It is my hope to share some of those interesting items here, and also point you to some interesting things that you may not know about Sirius Rocketry, one of the best-kept secrets in hobby rocketry.

I have been involved in hobby rocketry since 1969 when I was yet a smaller human, and have contributed to the hobby ever since.  The business of Sirius Rocketry is only the most recent form of how I have been able to contribute, but also one of the most rewarding.

It is my hope that I can bring items of interest to the hobby rocketeer here as well as items for the sci-fi and science geek and more. I also have a little rocketry nostalgia that I may dig out from time to time if you are interested.  Of course, some Sirius Rocketry news and business will be mixed in, but this is not the only reason for this blog. And some Sirius Rocketry history tidbits will also find it's way into this blog from time to time.

My favorite things are rocketry history, both real and hobby rocketry, history of NAR, Tripoli, NASA, NACA and more, and what we have done and what we hope to do.

And, a few sci-fi and fantasy shows on the side...

I just hope space and science fans enjoy, and stop by our site once in a while! :-)

David

The "Serious Guy"

Sirius Rocketry

In the photo: The Sirius Rocketry Saturn V launched on an AeroTech I284W-M trimmed down to a seven-second delay, just about ideal for the stock build of the kit.