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Model Forum / General / Rockets / December 2008New Aerotech RMS 18/20 User
I purchased a 18/20 and a 24/40 RMR plus reload kids for each. I have to say that the instructions which come with the reload kids absolutely suck. Does anyone have a good set of instructions for someone who is just learning how to put these together and is paranoid about screwing something up? I guess I was a little too quick to be harsh on the instructions. After messing with it for a while I think it's finally put together properly, although we'll see how it does on the first flight. Wish me luck! Bill >I purchased a 18/20 and a 24/40 RMR plus reload kids for each. I have to >say that the instructions which come with the reload kids absolutely suck. >Does anyone have a good set of instructions for someone who is just >learning how to put these together and is paranoid about screwing something >up? The instructions may seem a bit complicated the first time through, but frankly I think they've done a good job with explaining how they go together. Minor things to keep in mind - make sure you use lube on the O-rings (but not too much, enough to lube them, not drown them), and make sure you don't have particles on the O-rings (i.e., it's easy to get a few grains of black powder on them). Also, make sure that the threads are fully tightened - meaning no more threads available to turn - but they should be SNUGGED tight, not WRENCHED tight. It's best to clean them shortly after flight, I use baby wipes or equivalent. If you wait too long the gunk will become almost impossible to remove, but done shortly after flight it's quite easy. Good luck, I think you'll be pleased with them. David Erbas-White > I purchased a 18/20 and a 24/40 RMR plus reload kids for each. I have to > say that the instructions which come with the reload kids absolutely suck. > Does anyone have a good set of instructions for someone who is just learning > how to put these together and is paranoid about screwing something up? >The instructions may seem a bit complicated the first time through, but >frankly I think they've done a good job with explaining how they go [quoted text clipped - 6 lines] >fully tightened - meaning no more threads available to turn - but they >should be SNUGGED tight, not WRENCHED tight. Also be careful to not get any grease in the area where the black powder will go for the ejection charge. You would think that a combination of grease and black powder would be flammable, but instead it will probably keep the ejection charge from going off and your rocket will come in ballistic. I always look in the hole at the forward end of the reload casing before putting the powder in to make sure there is no glob of grease there waiting to gunk up the works. Another thing to watch out for are the red plastic caps that are intended to go over the nozzle and hold the igniter in place. These often work, but occasionally, especially in the smaller motors such as the 18mm, they will stay on after the motor fires. This results in an off-axis thrust which can send your rocket in an unpredictable direction. I've stopped using them and use a bit of masking tape to hold the igniter in instead. Jonathan > I purchased a 18/20 and a 24/40 RMR plus reload kids for each. I have to > say that the instructions which come with the reload kids absolutely suck. > Does anyone have a good set of instructions for someone who is just learning > how to put these together and is paranoid about screwing something up? A picture is worth a thousand words. Go to the Aerotech web site at: http://www.aerotech-rocketry.com/ Click on the left-hand side of the home page under "Resources." Then, click on "RMS & Kosdon by AeroTech (KBA) Motor Assembly Drawings." There, you should find an assembly drawing of the motor you are reloading. I print these one page pdf files out and carry them with me into the field. |
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