Ok I got what your all saying. I should have just went with the whole setup the guy with the same boat has...Leopard 4092-1390Kv, Turnigy 180A esc, and x447 left and right props. Maybe I can return the motors that I bought.
Good news! I got hold of the company just as they were to ship out the motors and cancelled the order. So now i'm not stuck with a pair of motors that would never have been used.
Who's the manufacturer? It sounds like they don't know what they're selling. Going off of whoever says those motors are made for 8s is reckless and an abandonment of common sense in my opinion. That's just my opinion. Nothing wrong with giving them a try if you like, that's how you learn. The 8s rating is total BS though and written by someone who doesn't understand how the motor works.
Outrunners are generally made for and used in Aeroplanes, where there is always a constant load on the prop, in boats the prop comes out of the water giving an unloaded condition and the motor RPMs will increase dramatically, it would not surprise me if it saw higher RPM on 6s in a boat than it sees on 8s in a plane.
The magnets and windings spin in outunners which inherently gives them a lower maximum safe RPM than inrunners in which only the magnets spin.
Outrunners will get next to no cooling in a boat whereas in planes they get good air cooling form forward motion or from prop blast even when prop hanging without forward motion.
I am a proponent of high RPM setups, but they require the use of small props and I suspect that a gas converted Aeromarine Avenger will be rather heavy and would prefer large props to push it, also I use carbon or kevlar wrapped inrunners for my high RPM setups not outrunners.
If you do decide to try them out rather than send them back use X438 props (the smallest 3/16" props available as far as I know), I was running 1780kv in my JAE rigger on 6s and pulling over 120A on a de-tongued X438, I would say de-tongue them but you will probably need the tongues to get it on the plane, just keep the runs short and check temps to start off with. I ended up cutting my x438 down to 34mm to get a decent runtime and a reasonable amp draw on 1780kv 6s 4500mAh. The motor I used was a Mega 22/30/2 an inrunner with a kevlar wrapped rotor, it handled it fine, but I have since dropped down to 1700kv with a 35mm de-tongued x438 for an increase in runtime, I now get 5 minutes.
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