Estes A8-3, B6-4, C6-5 Mini Bulk Pack - 9 Engines / Motors with Starters by Estes at STX Speedway Racing. Hurry! Limited time offer. Offer valid only while supplies last. This combo pack provides 3 each of the most popular Estes engines for use in most model rockets. The A8-3 is used for first flights and small flying fields as you get used to how your rocket will perform and where it will land in your flying field. The B6-4's will almost double your altitude. The C6-5's will provide almost double the altitude that the B6-4's can provide. Refer to the instructions or packaging that came with your model rocket for the engines you should be using. Estes model
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