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cooling question? - 9/29/2012 2:30 PM   
barney 5


 

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Last Login: 5/20/2013
From: brattleboro, VT, USA
Status: offline 		i purchased a genesis cat with a new liquid cooled 4074 leopard motor, i ordered a turnigy 180a marine liquid cooled esc. now this may be a foolish question but which should be cooled first the esc or motor? i'm all new with this boating thing but after watching all the vids on my setup and reading the forums i think i'm gonna have a pretty fast setup. also how do you measure props, i have no idea what i have for a prop.

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RE: cooling question? - 9/29/2012 2:44 PM   
yellow-bird


 

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From: Farmington Hills, MI, USA
Status: offline 		Hi Barney

Normally the ESC gets the cold water first, which then goes to the motor - the ESC electronics are more sensitive to heat. Looking at your other post I see you also have a water-cooled motor mount - the orange plate the motor is fitted to.Therefore the pipes should be:

- water pickup to ESC (cool the electronics 1st)
- ESC to motor jacket (take most of the heat out of the motor next)
- motor jacket to motor mount (take  bit more heat away from the motor)
- motor mount to water outlet (get rid of the warm water)

In terms of measuring props there are two key dimensions: diameter and pitch.

- diameter can be measured easily with a ruler (or at least estimated within a mm) across the blades - at the back of the prop is usually easiest.
- pitch is a theoretical measure of how steep the blades are angled - how far forward the propellor (boat) will move in one revolution if there were no slippage against the water. Pitch is like gears in a transmission - lower pitch =lower gear, good for acceleration but lower top speed; higher pitch = higher gear, better for top speed but worse for acceleration. Typical boat ranges are 1.4 to 1.6 for the type of prop you have.
- pitch can't practically be measured at home, but you can get an estimate by comparing the length of the propellor hub (the tube the blades are attached to) with other props of known pitch. The shorter this tube, the shallower the blades and the lower the pitch; the longer the tube the higher the pitch. Therefore if you took your random prop to a store and compared it with other props of the same diameter, the prop with the hub closest in length should be closest in pitch. 

-yellow-bird







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RE: cooling question? - 9/29/2012 3:11 PM   
barney 5


 

Posts: 167
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Joined: 4/25/2009
Last Login: 5/20/2013
From: brattleboro, VT, USA
Status: offline 		thanx YB, i am grateful for your quick reply. i kinda figured it the way you described but being new to boats i thought it would be smart to ask. i been doing off road for 30 years and thought i'd try a boat, i already smashed a heli so boating is next. i also have a aquacraft super v arriving next week which is rtr so i'm quite anxious to start learning with this less expensive boat...

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RE: cooling question? - 9/29/2012 6:15 PM   
siberianhusky



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From: Peterborough, ON, CANADA
Status: offline 		I add a second pickup & outlet to run separate systems for the motor and esc. Helps big time during the heat of summer to have cooler water going to each component.

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RE: cooling question? - 9/29/2012 6:44 PM   
barney 5


 

Posts: 167
Score: 100
Joined: 4/25/2009
Last Login: 5/20/2013
From: brattleboro, VT, USA
Status: offline 		i saw the spartan dual pickup and considering it. are there more besides that one. need a link for boat acc's...

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