I have a question about long tail keywords for an ecommerce site. The ecommerce site im working with sales airplane propellers. So for example theres tons of variations of the same product with slight changes such as Sensenich Rotax Carbon Fiber Propeller, Sensenich Rotax Steel Propeller, Sensenich Rotax Aluminum Propeller. So even though these are the names of the products none of these phrases get searches in but Carbon Fiber Propeller gets 100 something searches, carbon fiber prop gets like 50, propellers gets a high amount, and then the same variations for the steel and aluminum ones get varying amounts of searches but not in the same order, so props would get more searches then propeller in the aluminum category but not steel. Im not sure really how google targets the individual keywords in the set since the whole phrase gets no searches. Im getting really confused and not sure what or how to target. I really don?t want to have to keep changing between prop, props, propellers, etc based on their ranking for each set but will if need be. Also there are a lot of products that have the same exact name but have a different part number. How would I differentiate in google so that im not getting duplicate content penalties? Just change the description / content? Thanks.