Kintec Pursuit: Where to place extra water pickup.

[IRON-PAWW]

Hi All,

Ok so you will probably all recognise Jan's handiwork. This is Kintec's Pursuit 32" hull.
Leopard 4074 2200kv Motor.
Seaking 180Amp ESC
Prop fitted is an Octura M445.
Kintec's upgraded one-piece flex shaft.
Tactic Receiver


So I ran the boat with a Gens Ace 4S1P 5000Mah 40C LiPo and promptly melted the stock Deans connector. So - now 5.5mm bullets replace that. But, I still have the 4mm bullet connectors on the motor. They do get hottish, nothing drastic so far but certainly on their way there. What I've been experimenting with (on other boats) is using some heat glue, Arctic Silver Epoxy for instance, to glue the wiring to a water cooling block. But I'm not keen to put any more constrictions into the current single water line in the boat, so I want to put in a second line for the water block.

I was hoping someone else had already installed a transom mounted water pickup and could show me where they put it and exactly which pickup to order. I have several transom pickups here but none will fit, unless I glue them on which I'd rather not do. Any suggestions??

I think I have the wrong Flex shaft for the boat. See how far the drive dog is from the end of the strut? Is that sticking out too far??

Boat runs well, and the leopard and ESC don't get hot at all. I think If I pushed the boat a little too hard though the 4mm connectors would get too hot - hence the installation of the cooling block. What's been people's experiences there??

[wade7575]

I have seen guy's mount them on there Trim Tab's before and have them so they are about an 1/8th below the Trim Tab.

If you want a Transom Mounted one you could get one from a Hobby Dealer if you have any that carry AquaCraft and get a Mount and Tube for a Montely Crew or get one from OSE they have a really nice one.

[IRON-PAWW]

You mean mount the pickup on the trimtab itself? I suppose you could drill a hole through the trim tab big enough to fit the brass tube, then somehow use the tab adjusting assembly for extra support...... Anyone done that?? Seems plausible......

On the other hand.... does anyone know of a dual pickup rudder that will go on the pursuits??

[osprey21]

Or, you could go with one of the thru-hull pickups.

[IRON-PAWW]

I did think about the under-hull option but I'm really not keen to go cutting holes in the hull - just don't trust myself. Think I might be able to get away with mounting a transom pickup between the trim tabs, and drill a hole through the tabs for the pickup to go through........... Looks like it might work...... Well..... That's the theory.........

[tlandauer]

Would it be easier to just replace the ESC to motor with 5.5mm bullet plugs? I have the same boat , with 4082 2200kv, running with 4s2p, no heat build up on those connectors.
Don't get me wrong, your idea is brilliant, but IMO any extra mounted pick up will only add drag.

[IRON-PAWW]

Yes tlandauer you may well be right. I was hoping someone with the same boat & setup could offer comment. So....... If you have the 4082 motor and run 4s with the 5.5's on the esc -> motor wires without issue then I might try that first as well. Just that while the connectors do get the hottest, the actual wiring also gets hottish as well. Test the 5.5's and see I suppose. Just seems odd putting huge connectors like that on such small wiring. The pickup would create extra drag there's no doubt, but I suppose it's a cost vs benefit situation.

What prop do you run?

[tlandauer]

I use M 545 ( got the wrong prop from another place but the guy convinced me to give it a try). Turnes out he was right, love that prop, it is not a 645, so i don't need to worry too much amp draw, yet seems to give a little extra when compared to a M 445.
I run 4s2p, but my ESC is in the back, so my battery packs are closer to the motor. Did you check you COG? If the boat is running wet, you might experience heat issue. My wires are only slightly warm to the touch after 4 min.+ of running. I mean only a hint of warm temp.

[IRON-PAWW]

Interesting!

Thanks for your comments by the way tlandauer!

I assume that the 4082 has the same gauge wire connecting into it as the 4074? So essentially, I'm slightly down spec from you, with a smaller motor and the less aggressive pitch of the M445. Might cause some differences, but still a fairly similar setup. You run with 2 x 4s packs as well - so more LiPo weight right there.

Yep I think the boat *is* running a little wet to be honest. Not drastically mind you, but a touch. I was wondering about putting a 4s pack so far forward, but I have zero porpoising and I think when I speed up the runs a little more the wet running might improve. Still..... It is a thought though. You see how the boat sits at rest in the pic above....... Thoughts on that??

Really, the 5.5 bullets are just extra heat sink when it comes down to it right? They aren't going to make the wiring harness run cooler as such are they? Just that with them installed the wiring needs to get a whole lot hotter before you get a de solder.....right? Or am I thinking that through wrongly......? So if there's heat building up in that wiring now, the simple addition of the 5.5's isn't going to get rid of that heat.......... Just help manage it.

In any case the 5.5's are an easy install so I guess it's the first thing to try - along with tweaking the attitude of the boat in the water.

[tlandauer]

It's hard for me to tell if my boat squats lower than yours in the water in static mode, however, I was not happy with the run time and the 4082's appetite for juice so i decided to run 4s2p. I time my run so i don't make everything too hot, run time and even performance is noticeably better.
When the boat is on plane it always looks as if it is not running too wet. I too have this problem, when I look at videos of some of the really experienced members' boat, their mono is only riding a small area in the rear. Mine actually still runs way too wet.
The 5.5's are better at handling the amp draw, they allow current to flow more efficiently, I don't see them as heat sink, I see them as wider intersections to handle higher volume of traffic.
Efficiency = cooler temp.

[Rumdog]

Yup. Just upgrade to the 5.5's. problem solved.