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06-13-2014, 05:33 AM

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Duane-RCU

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Engine for my Viper?

I have two set up for Q25 racing, and a spare.... Engine choices I have are .... TT.40 Pro ... Webra Speed .40 ... old Super Tigre .45, the round/6 bolt head. What do you recommend? Prop size and quess on speeds?

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