Is this for Naviga racing? The 6+mins runtime is the length of a Mono2 race and those battery sizes are up at the top or what capacitys are readily available in a 560gram pack within the Mono2 rules at the moment. (yes 6s can be the same weight as 4s,and Naviga give you a choice in voltage limiting the weight of the LiPo)
A 3674 is all you need, With those packs and that runtime the currents are easily calculated, at a maximum average amp draw of 65A for the 4s pack and 50A for the 6s pack, going up in motor size will just weigh the boat down and take more amps to spin up reducing speed and/or runtime.
If it is for Naviga and those cells are sub 560g packs I have to warn you that while being amoungst the best cells that you can get, the latest 5000mAh 3s/6s packs are overrated and are only actually putting out 4500Mah, despite the different labels in the real world Desire5000s, ETTI4500s, VB4500s, and Zippy Compact4000s all graph pretty closely to each other.
The stored energy available normally works out pretty closely between 4s and 6s at the 560g limit, but there are some efficiency gains from 6s and most folks that have the money to have switched to 6s, if I was buying from scratch I would go for a 6s setup.
While I don't know the DF29 well enough to say for sureI would hazard a guess that you will be able to get runtime with that setup, if not with that prop then a similar size 2 blader.
If it is for Naviga racing I have to warn you that the DF29 is rather heavy and draggy compared to the usual European and Chinese stepped Mono2s and it won't be as fast in most conditions, barring extreme rough water when folks are adding ballast and/or using partial throttle. I know folks with lightly built carbon stepped Mono2s running 4s 2700kv and 6s 1900kv, but there is no chance you will get 6 minutes in a DF29 with a setup that hot and a prop big enough to drive the boat well.
Paul Upton-Taylor, Greased Weasel Racing.
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