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Have a twin Zonda as one of my boats,I’ve had cooling issues with it,it has a dual pick up rudder with large diameter tubing,when I put a tube against the exaust port and blow its EZ to blow air back thru the rudder ,I pulled the lines off and checked the motors and ESC to make sure they were clear ,still just a trickle of water comes out the exaust port when I run the boat by,I had an extra rudder so I changed it but no difference ,the ESCs get hot fast,I sprayed some WD 40 inside the exaust ports then blew it out with an air compressor and it all blew right out the rudder ,I’m really at a loss as to what to do to get water to flow ,help please ,thanks ,
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does the rudder water pick up have a decent opening for water intake ? no restrictions inside the rudder tube ? can you show a pic of the set up ? -
Both rudders look the same ,intake holes are small ,I’ll try and figure out how to post a pic but it’s the same dual intake at the OSE store,I looked for a better rudder but didn’t find one ,thanks ,Comment
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Detail the rudder holes. Take a round file and make the slot before the hole longer and deeper. It will pick up more water. Drill your fitting out a size or two. Chamfer (round or bell mouth) all the fittings in the direction of the water flow. In other words where water is coming in, chamfer or radius it there.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Btw the easiest and safest way to drill the fittings is to chuck them up in a drill and hold a drill bit in a vice.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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I just drilled the slots in the rudder by laying the drill bit flat on the rudder and drilling the holes a bit larger ,I’ll see if it works today,I noticed when blowing thru a red cooling cover for a leopard motor lots of volume flows EZ ,not so much on the black ones that come with the TP motors ,I think that’s the restriction,Comment
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The large diameter black tube ,didn’t make it out to the lake today ,I’m thinking the motor jackets are the problem but what a pain to get them out ,Comment
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If you atleast getting a trickle of water exiting the motor / esc, that should be enough to keep both cool i would think, a constant trickle means cool water is flowing in and out so maybe its not a water cooling issue atall .Comment
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Maybe your nipple connectors are too small in diameter somewhere? Maybe at the rudder, or maybe at the motor, etc.
You can drill them a size or 2 more in diameter... see if that helps any.
You can also go the option of adding a water pump. Theres a really great mini 6v water pump that is made in japan that I found on ebay that only weighs like 50 grams or so. PM me and I'll get you the link to it if you want.
Every guy that runs an RC boat in Europe uses a pump... so its not that usual as you may think. I run them on all my cats now.Comment
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Again a picture would be very helpfull I'm also using a water pump inline in my twin rigger that helps a lot specially here where temps are hot year round.GO FAST AND TURN RIGHT !
www.grsboats.com.brComment
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I don’t want to sound silly but I don’t know how to post a pic ,and I don’t know what I would show you,The one thing I’ve found that really stands out is the difference in restriction when blowing thru a water jacket on a TP motor and a red one on a leopard motor ,since the water hits the motor first it gets restricted right there,well actually it could hit the motor last and cause the same flow restriction,before I drill any fittings out,and probably ruin a few,I need to remove the motors and check the water jackets,I’m really interested in a water pump ,thanks guys ,Comment
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That is not true, I live in the UK and have raced in Europe, against people from all over Europe, and have only ever seen 1 boat with a water pump, and that was a high volume low pressure pump fitted to a sponson to make the rigger self-right on command, it wasn't even connected to the cooling system.Paul Upton-Taylor, Greased Weasel Racing.Comment
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There are many good micro water pumps brands like TCS from Uk: http://www.micropumps.co.uk/TCSM400range.htm
but I'm using this one sucessfully:
GillGO FAST AND TURN RIGHT !
www.grsboats.com.brComment
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Got my water pump today ,way cool,hooked it up all different ways and it pumps just fine ,I’m going to put it up in the nose ,run double suction lines from the dual rudder,then feed back thru the ESC ,meter and out ,tried it on the bench and it had great volume ,Comment
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