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===== Special Hardware for RMS ===== * Forward Seal Disk: an aluminum disc with a hole in the center and an o-ring groove on the outside that seals the forward end of the liner in order to prevent gas from passing around the outside of the liner and damaging the case. These are used on longer motors and some smaller motors that are particularly high-performance. In 75mm and 98mm there is a stainless steel variant; the 98mm one is used specifically for Super Thunder motors. * Endburn Style Forward Closure: in 38mm, the endburning Warp 9 motors do not include a delay grain and use a unique forward closure that supports the front of the grain and displace all empty volume. * Forward Closure Bulkhead Plug: in 54mm and 98mm, in lieu of a special forward closure, a plastic plug replaces the delay grain that sticks forward enough to fill the empty spaces forward of the grain. * 54mm Extended Forward Closure: in 54mm, long burn White Lightning motors (including the loadable K250W ) require a longer smoke grain than the standard forward closure accounts for. * 54mm Small Nozzle Aft Closure: in 54mm, the lowest-thrust motors use a smaller nozzle (also used in 38mm motors) that requires an aft closure with a smaller opening to retain it. * 98mm Enlarged Aft Closure: newer 98mm reloads use a larger nozzle that does not fit through the older 98mm aft closure. This works with all 98mm reloads so this is the only 98mm closure currently sold.
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