Clusterin' (Misc)
Clusterin' is usually defined as t' use o' two or more motors in a single stage which are ignited at t' same time. Ignitin' motors at different times, matey, air-starting, can be considered as a type o' clusterin' as well as a form o' staging.
Clusterin' can be used t' provide greater initial thrust for heavier or draggier rockets.
T' basics o' clusterin' are described in "Cluster Techniques" (TR-6) which you can download as a PDF from Estes as a part "T' Classic Collection 
," a collection o' classic Technical Reports from Estes.
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