hi last ditch effort before i take up knitting recap presedent huntsman 46 inch wooden kit hobbyking turnigy aquastar 408 4-1050kv water cooled brushless 160a water cooled esc thank you all for your help steve
Hi. The HK controller is an Aquastar 120Amp water cooled which has suffered all of the burn outs and never failed. SKU: 9052000008. The failed motors were all 2848SL 3900kv Brushless Inrunner (WaterCooled) SKU:3900-2848SL. I have my doubts about the specifications as their watts and amps do not add up. I have a temperature sensor on the motor sending info back to the TX and usually after a full charge and a fast run it would get to 60°C, then I would cool it to 45°C before the next run it burnt out at 85°C when I wasn't paying attention. The new motor runs at about 45°C how ever hard it is pushed. Still using the 120A ESC. The new motor was in the HK sale and I don't think they do it now SKU:S2858-2630. It just happend that the water jacket for the failed unit fits it.
BIG MISTAKE I brought a 5300mha -50c-14.8v-4s1p-78wh LiPo battery yesterday. Bloke in hobby shop checked my ESC which is a TURNIGY AQUASTAR Watercooled ESC 160A. and said that it could handle that size battery. Giving the boat a test run this morning the ESC erupted in a huge cloud of black smoke. Not happy Jan will be ringing the hobby shop in the morning. Allan
I have upgrade my Palm Beach to run BL 28mm Kehrer Jet Motor: BL Roxxy 3656-06 1800KV with watercooling ESC: Water cooled Aquastar 120A. Battery: 2 pcs. Lipo 3S 25C 3700mA for balance and weight Palm Beach from Billing Boat on it's first test at Vallensbæk Modelskibs Klub water https://www.youtube.com/watch?v=8qBwleXQQ3E Regards Carsten
Hi I peek the motor and speed Controller can you all tell me if its the right speed controller for the motor r not? heres the Specs:Turnigy AquaStar 4084-620KV Water Cooled Brushless Motor RPM/v: 620kv Winding: 2.5Y Max voltage: 37V (10S) Max Current: 105A Max Watts: 3050W Resistance: 0.03ohm No Load Current: 0.7A Can Diameter: 39mm (actual motor diameter) Can Diameter inc. Water Jacket: 49mm Can Length: 84mm Shaft Size: 5mm Weight: 508g Motor Connector: 4mm bullet plug and heres the Speed Controller im going for Specs: Voltage Input: 2~6 LiPoly cells (6~18 NiMh) Continuous Current: 120A Burst Current: 720A BEC Type: Switching with on/off switch BEC Output: 6V@5A Motor Connectors: 4mm Servo lead: JR style Servo Lead length: 300mm Water Cooling Pipe: 3mm I/D~5.4mm O/D Dimensions: 68.5x39.4x32mm Weight: 160g many thanks cliff
Hi, The motors are turnigy aquastar 3660-1460KV watercooled brushless motors x2 The esc's Hobby King 90a Boat esc 4A SBEC water cooled. Batteries Turnigy 4000mAH 3S 20C Lipos. Bow Thruster Raboesch 108-01. Do you recommend a Mixer.
Have had a look at powerplant options. Turnigy AquaStar T20 3T 730KV/1280KV Water Cooled Brushless Motor SKYRC Proteus Water Cooled X520 730KV 1280KV Brushless Motor for Marine IM680 I like these as they can switch output power. Shame I'd have to bring the boat size down considerably to afford TWO of these! Still looking for a reasonably priced 150A ESC.
Hi, I use the same motor on both my 46" Fireboat and on my slightly bigger Perkasa. It is the Turnigy AquaStar 4084-620KV, run with two 5000mAh 4 cell (14.8V) LiPo batteries in parallel, and this gives both boats a brilliant and potentially slightly overscale speed and a long run time. Go to http://hobbyking.com/hobbyking/store/__31678__Turnigy_AquaSt... to see it. Both boats are single motor, single shaft, 3 blade propeller, the Fireboat has 50mm prop and the Perkasa 55mm. This motor will produce 3kW in short bursts but is relatively lightly loaded in these boats so it has power capacity to spare. The kV value is just the rpm per volt applied to the motor so a 620KV motor runs proportionally slower than say a 1600kv motor which is probably too fast for this sort of boat, and it means you can run a bigger prop. For the speed control I use see my boats on this site.
Interesting. I'm guessing you are using LiPo batteries and as you are aware they should not be discharged below the manufacturer's minimum voltage. Some of my higher powered LiPos suggest a 3.5v cut off but you set the actual value in your ESC. A little math shows that the power (watts) of your motor is the product of the voltage applied and the current flowing so for a 120 watt motor at 12v the amps are 10. If the voltage drops to 6v the amps could then be 20. Haverlock has identified this as a likeley scenario and I would agree. Ideally your ESC should exhibit decreased performance before switching off the power transistors to protect your batteries, this then allowing you to run at minimal speed back to shore. The 120 amp Aquastar may offer advance protection but you would need to read the manual. All my ESCs stay dead if the battery drops below the set cut off and will not rearm until the battery is disconnected. I appreciate that you were advised that the ESC would rework after a minute but this is putting you, your model and your LiPos at risk. Unlike other battery technologies, LiPos chemical structure can change if the voltage parameters are exceeded. Once changed the position is irreversible and you will lose capacity and in the worst case there could be an explosion and fire. Dave
I have just been out running my Perkasa happily blasting up and down the lake at full throttle for about half an hour until the battery cells went low and the ESC cut the power. As I was advised and since proved if left for a minute the battery comes back up again and I can usually tootle back to the side. I waited and sure enough got some headway but probably rushed it a little and the cells went low again and it stopped before I got it to the bank. I then found it wouldnt move after waiting and I had to wait for it to drift to the side. Upon investigating I found that the two 30 amp fuses in parrallel had blown. I cant understand how the fuses are ok blasting up and down but blow in a low voltage and low throttle setting. I replaced the fuses and everything works as it should. The only thing that occurs to me is if the ESC actually sinks power to prevent movement but that seems unlikely. The ESC is a 160 amp Aquastar Any ideas? Les