[Planet News] RCS releases four EMK Experi mental Motor Kits

RCS Information Release 12/7/06
CEDAR CITY, Utah USA RCS is making four different "EMK" motor kits available to the experimental rocket community.
Over the past few years, a number of customers have been requesting that RCS produce experimental motor designs in kit form. After considering several options, it was decided to release an initial line of products based on a variety of popular single-use motor configurations.
These include 60 newton-second (part no. EMK2960SC) and 80 newton-second (part no. EMK2980SC) 'F'-class motors and two different 'G' designs (part nos. EMK29120C and EMK29120S). The 'G' kits are different only in the thickness of the paper liner that is packaged with each kit. The 'C' version uses a thin liner for core-burning designs while the 'S' kit includes a thicker liner which is best suited for longer-burning slotted grains. The two 'F' class kits use the thicker liner that may be used with either cored or slotted grains.
The new RCS EMKs use a one-piece phenolic case that includes an integral molded nozzle. The case has been tested to over 1,000 PSI but is recommended for motors running in the 500-600 PSI range. The nozzle throat and exit cone may be easily drilled to accommodate a wide array of grain designs and propellant formulations. The bulkhead end of the case is threaded to accept an included matching molded forward closure which can be bonded to the case with 5-minute epoxy.
The kits contain universal delay charge components such as an o-ring, delay insulator and an ejection charge cap. Users can separately purchase RCS propellant and delay casting tubes that are specified in the EMK "assembly guides" which are packaged with each motor kit. Alternatively, the guides suggest that the customer purchase AeroTech "RDK" pre-manufactured delay elements for use with the kits. The assembly guides have a detailed assembly drawing on the reverse side which portrays a typical motor configuration. A bondable aft thrust ring is also provided for the user's convenience.
EMK prices range from $8.00 each for the 60 N-sec kit to $10.00 each for the 'G' motor kits. Customers should note that RCS EMKs contain no hazardous materials since the propellant, igniter, delay, delay spacer and ejection charge are not included. Please visit the "Products" page on the RCS website at http://www.rocketmotorparts.com to download the current RCS order form which details prices, shipping costs and other information. In addition, all four EMK assembly guides may be downloaded in PDF format from the RCS "Resources" page.
RCS Rocket Motor Components, Inc., Cedar City, UT.
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Planet News wrote:

Gary has a tradition of interesting product paths. This particular line is interesting...
A path straight to the F & G size EX motors without having to go via Level II would be interesting too.
Still not sure what to thing of the LMS line.
Just yammering...
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9.1.2 All flyers at a Tripoli Research Launch shall be members of Tripoli in good standing and shall have achieved Tripoli Certification Level 2 or greater.
Interesting.....

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JR wrote:

True, You have to be a TRA L2 or greater. But is does not say what size motors you have to fly. You can fly 29mm F/G research if you want. This is just another opition to look at. Tony
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Just because these exist, doesn't mean someone with less than a L2 can fly the at a TRA laumch. Did you know that some people with L1, L2 or L3 fly things smaller that those that they are certified for. Also, making 29mm loads are a pain because they are kinda small. 54mm is much easier to work with.
I suspect that AT is trying to dump some casings that they already have. If they were making a new product, they would go for the part of the market with a bigger demand.
Phil
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Phil Stein wrote:

I think making new products for any aspect of rocketry is a good thing. But...
A few people may think it's worthwhile to pay $8/$10 for parts to make a single- use F/G motor, then add propellant mixing supplies, equipment, and time. Most who have some experience in amateur propellants will know better. Those who don't will soon find out. That may be the best purpose for Aerotech to make this product available (other than selling surplus parts). Single-use motors don't seem that expensive after all!
Now, an experimental reload kit with enough parts for multiple F/G firing would be more practical. Especially if the kit had a graphite nozzle. The cost-effectiveness of this option would not bode well for Aerotech reload sales. Unless, of course, we're talking about replacement RMS casings. ;-)
-John D.
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The prefect in our group turned a 12 inch 24mm aluminum casing with graphite nozzles. After one unsuccessful test firing due to wrong sized snap rings, we had a success. The failure was pretty funny. The motor was in the ground, the forward closure blew out and the casing launched 100ft straight up. Got all the parts back and actually only one grain was partially burnt and went out. Replaced it, redrilled the cores a little bigger and got an H-205 (calculated) out of it.
Kurt
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