? Outrunner powered PMono ?

[Brushless55]

Just throwing this out there as I see outrunners doing a great job as power for our FE boats
has anyone raced a PMono or PHydro with an outrunner?

[Fluid]

I'm sure some have. The problem as I see it is that outrunners do not have the amp capability of inrunners. Even premium outrunners like Scorpion are limited to about 100-120 amps, so trying to run with premium inrunners pulling 180+ amps will probably not be too successful. OTOH I run outrunners in sport applications with great success as long as I don't exceed 100-120 amps. I have raced an outrunner-powered Q-Offshore cat and while it was not competitive against the inrunner boats it was still lots of fun.....


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[Brushless55]

something like this T600 1970kv could be a good one to run?
http://www.hobbyking.com/hobbyking/s...ass_Heli_.html
if it could rev our pulling a X447/3 prop, it could have some great speeds...

[siberianhusky]

I can't remember the KV but my buddy runs one on 6s on a 7.5cc dumas tunnel, that motor can turn a far bigger prop than the hull can handle.
I have a 1970 I haven't tried in anything yet, was going to try it in a Motley Crew but decided it was a bad idea after seeing Kens move that tunnel!

[Fluid]

something like this T600 1970kv could be a good one to run?

Really, a $35 motor for P racing against $150+ inrunners? It doesn't matter if it will spin the prop or not, it is the amperage it will handle without damage. Outrunners have lots of torque but are difficult to cool efficiently, that is why they are most successful in OB applications where they are constantly sprayed with cold water and lots of air. Shut up inside a hull they get hot and will overheat if drawing too many amps. Even keeping the amp draw to <120 amps average the Scorpion 4025 motor comes in after a one mile heat at 185* - even with fan cooling. That Scorpion motor is far more efficient than the HK bargain motor, and it gets hot putting out around 2500 watts.

Hey, try the HK motor if you want.....



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[Brushless55]

I can't remember the KV but my buddy runs one on 6s on a 7.5cc dumas tunnel, that motor can turn a far bigger prop than the hull can handle.
I have a 1970 I haven't tried in anything yet, was going to try it in a Motley Crew but decided it was a bad idea after seeing Kens move that tunnel!

sounds cool!
and why did you shy away from trying the outrunner in your MC?

If we could swing a bigger prop that nets better speeds and pull less amps, this could be a good thing...

[siberianhusky]

My Castle 1512 beat the crap out of it when it would blow over, broke off both hatch braces within 50' of pulling the trigger for the first time! Big blow over! Got it running well but it was too fast for the quality of the hull. I run it on a stock setup now and am happy with what it does for a 350$ boat.
One of the reason I never really though too much about what to do with that t600 is cooling, I'm planning a outboard kneeler down the road, we have two running here now and they are fun boats, good chance thats what I'll do with it.

[Fluid]

If we could swing a bigger prop that nets better speeds and pull less amps, this could be a good thing...

Uh, no. It takes a certain amount of power to push a hull to a certain speed, a larger prop may be more efficient, but outrunners themselves are less efficient than inrunners at high amp draws.

You can't reinvent the wheel here. Think about it - if outrunners were the best/most competitive way to power a P boat then lots of racers would be using them. The fact is they are not except for a few outboards. Most who have tried them either quit running them or burned up their equipment.

Outrunners have their place - I love my Scorpions - but not for open motor racing. But don't believe me, buy a few and see for yourself.


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