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>> Home > Tags > cooling

cooling
cooling
H.M.S. BRAVE BORDERER by reilly4 Commander   Posted: 15 hours ago
Hi Rowen, I have had water cooling on all my patrol boats running at 12Volts, whether brushed or now brushless. For the brushed motors I have used aluminium tube coils with water pickups between the propellers and rudders. I did try water jackets a couple of times but found too much friction loss and therefore lack of flow. For the newer brushless outrunners I use a brass tube soldered to a brass plate across the front of the motor fitted between it and motor mounting bracket. I agree with Doug with regards to the disconnection of the red wires on the ESC's. This is now common practice, especially if you have an external receiver battery.

H.M.S. BRAVE BORDERER by RHBaker Fleet Admiral!   Posted: 1 day ago
Thanks all for the responses. Donnieboy - have thought out the plumbing, which is simplified by using a cooling pump. See future episodes! Doug - appreciate the concern regarding the red ESC wires. Have been trying to understand the rationale behind that theory. If all ESCs share a common input voltage, i.e. from one battery, what would the connection of multiple red wires do? Can understand if there were several unique power sources, but that is not the case here. Perhaps with your electronics background you can explain. Colmar - Used the angle on the scale drawing. If it were good enough for Vosper, should be good enough for me! Think it close to 7 degrees anyway. Think short shafts with oilers should help. Have heard of bushings running dry and seizing with these high speed motors. The initial props are scale versions of the originals. Rather suspect they will not prove to be ideal. Have purchased some 2 blade racing style props for a future test. They have a much coarser pitch and are designed for high speed motors. Intend to use plastic props initially as they are cheap enough to experiment with. Perhaps others have a comments on the cavitation question?. Incidentally, this is my first high speed boat too, but there is much of information on both this web site and Model Boat Mayhem for guidance. Posting questions always generates useful information. Look widely though at all types of fast models, MTBs, RAF launches, E Boats etc. - it has all been done before!

H.M.S. BRAVE BORDERER by Donnieboy Admiral   Posted: 1 day ago
Nice installation of the electrics.Easy access.It might be better to plan the water cooling right now just in case something gets in the way.

H.M.S. BRAVE BORDERER by RHBaker Fleet Admiral!   Posted: 1 day ago
Once the rudder, propeller and shafts were installed, the position of the motors could be established. A light aluminium bracket to hold all three was fabricated and bonded to the hull. Due to the high speed capability of the brushless motors, particular attention was paid to alignment. Also kept to the shortest prop. shafts that could be fitted to avoid whipping. Although the motor type might change, whatever is best will require a sound electrical installation as the current requirements for each brushless motor could reach 50 Amps. Wired each motor and ESC separately with its own dedicated fuse to give the maximum system protection. There is an extra fuse section allocated for auxiliary circuits, such as a cooling water pump and lights. Will try the original planned layout of 3 x 2835 motors with 30mm propellers and a 2S Li-Po battery first. Am hoping the reduced voltage will also make these motors more tractable. For the test program the three ESCs will be each controlled from an individual Rx channel. Once the final layout is determined, a more sophisticated and flexible control system can be installed. To minimize ballast, particularly around the stern, the battery will be housed as far into the bow as possible. After the test runs the final battery type, size and location can be established. To assess performance, hope to try both 2 and 3S Li-Po batteries. Planning to reduce heat build up by fitting cooling water jackets to the motors, these are easiest to instal at this stage so the wiring or mounts are not disturbed in the future. Have not decided the layout for the water circuit yet, but this easily can be added later. All that is needed now is the ice to melt off our local lakes so tests can commence.

rudder and water cooling by boaty Commander   Posted: 4 days ago
Very nice model. The moulding looks of good quality and there is opportunity for a lot of detail to be added. Sailing at scale speed it will appear very realistic and should look great on the water. Boaty😊

rudder and water cooling by CB90 Commander   Posted: 15 days ago
Added rudder and water cooling pic-up and exit port today. Please note added strakes to underside of hull this is to force water under the boat, as vacuum formed hulls like this have curved chines which can cause the hull to be held back by the suction of the water. Also added some details such as hatches, and hand-rail effect to the cabin and painted it (stage 1) and also constructed a smaller servo cradle than the one provided.

Brushless Programming Cards by BigAlio Lieutenant   Posted: 26 days ago
Hi looks identical to goolrc brand available on ebay from uk sellerhttps://www.ebay.co.uk/itm/GoolRC-200A-Brushless-Water-Cooli... also I use hot glue gun to seal instead of silicone

Brushless Programming Cards by CB90 Commander   Posted: 26 days ago
Thanks for your responses, please note this ESC does not have a brand name (generic Chinese job) and it didn't have any mention of a card on the instructions. Anyway I tried it on 2 cards I have got and they did not work, resorted to sticks and code tones to turn off the break function. Boat ran well if a bit too powerful, may use 7.4v instead of 11.1v Features: 200A Brushless ESC with 5V/5A SBEC Water cooling. Waterproof design(Need to use 704 silicone rubber by yourself). This super simple boat series comes with a limited range of programming functions and are designed to be plug-n-play. A perfect ESC for those looking for something simple to use and economic. Specifications: Cont current: 200A Burst current: 230A BEC model: Switch BEC output: 5V/5A Recommend battery: Li-ion/Lipoly 2-7S;Ni-MH/Ni-Cd 6-20NIMH Cooling: Watercooled ESC weight: 124g ESC size: 92mm * 40mm * 22mm Please note only cost £17 at the time , now £32 (4/2018) via Amazon

Interceptor by CB90 Commander   Posted: 26 days ago
[Score: 8/10] 24"/2000g Interceptor Capable of 15mph and a runtime of 10mins Single Propellor (2 Blade X Type 35mm) Direct Drive to a 2958 watercooled (2 Blade X Type) Powered by LiPoly (11.1v) 6Amp/h Batteries Controlled Through Unknown 200A (100Amps) ESC - Comments: Zoom 1 (Interceptor) Mono boat. Built from a Glassfibre hull, brought on Ebay for £35 the hull is a slim mono racing type with a self-righting side cabin it runs a 1400W 14V 2958 4200KV Brushless Motor and 29-S Water Cooling Jacket with additional air cooling fan. I did not want to use a flexi drive as high maintenance and prone to failure so the shaft runs via two universal joint one at each end. the propeller is a 38mm copper alloy The ESC is a 200A and water cooled the twin rudders supply separate water one for the motor and one for the ESC. The rudder are positioned to reduce prop-walk and are hinged to prevent damage if hit a object in the water and ride adjustment. Turn fins and trim tabs for ride adjustment were provided by a spares kit for another boat. also foamed and added an inner sealed hatch, a rubber bump strip and safety loop. The Boat is fast and over-powered used at half throttle, may use a 7.4v lipo instead, the self righting works well.

Aerokits Patrol Torpedo Boat by MouldBuilder Lieutenant   Posted: 26 days ago
Hello Canabus. Please can I take you up on the pdf files of the plans for my boat. I have an A0 printer so should be able to print them full size. I have looked all over for the originals without success. I am learning a lot as I go and wonder, looking back, if I have made a mistake. I bought the 3648 1450kv motor, yes, the beast. Just cannot help myself!!😁 Now that I understsnd these motors a lot more, I realise that it is an outrunner. Do you think I need water cooling and if yes, how is this done when the main outer can is rotating.😊🤔 Thanks.

HMS HOOD by Trumpeter by RNinMunich Fleet Admiral!   Posted: 29 days ago
Sorry for the digression Steve 🤔 Re your smoke generator - I hope you don't want to lay a smoke screen! Several years ago I fitted a Graupner smoke genny to my destroyer and hoped to feed both funnels with it. No way! 🤔 According to instructions I fitted it in a 10mm tube (alu) in the forward funnel, with the wick in a 'tank' made from a large aerosol cap, and fed it from the drive battery (12V SLA, 2 x 6V 7AH) via the Gear switch on the TX and a home made decoder / relay switch at the business end. First: it takes a little while to get 'steam up', second at best it produces whisps of smoke, and white so it looks more like steam. 🤔 Have experimented with 'additives', e.g. graphite, but have not yet achieved real black smoke. To increase volume when I refit the destroyer I have a second genny for the aft funnel and intend to build 'smoke reservoirs' under the funnel tube and drive it all with a 6v cooling fan from an old PC graphic card. The 'chimney effect' alone is not enough 🤔 I hope that in this way I can increase the volume so it looks a bit more realistic when 'getting steam up' or on 'Full Ahead Both'! (Give me all you've got Scotty!)😁 For various other 'mini model' projects, 1/350 Plastic Magic, I have acquired several mini smoke gennys from the model railway (1/87) department - experiments are on the To Do list😉 Cheers Doug 😎

more progress. by Skydive130 Fleet Admiral!   Posted: 1 month ago
First job today was to reduce the rudders by 1cmx1cm which I think not only looks better but should reduce the affects that have been mentioned in comments below. Ive fitted the cockpit which I assembled yesterday. Its not the best fit into the deck, however, I shall blend it all in with some balsa strip, sand, filler, sanding sealer hopefully for a seamless finish. I have pictured the 2 x Hobbyking waterproof boat 30 amp esc. These are supposed to be water cooled, however I am not going to fit the tubing and start drilling water pickup and exit holes in the hull x 4 until I think that water cooling is going to be necessary. Once I have watt meter readings for 2S and 3S lipo, it will give me an idea what the ESC are going to be like. Of course if you guys think I need to go water cooling, please let me know! I have an Mtroniks W-tail mixer that will allow the motors to be synched to the rudders allowing the inboard motor to slow or stop when turning. Never used one before, so may need to some programming once hooked up, we shall see. Last job today was to shoot a could of coats of red oxide primer on the lower hull to see what the resin finish was like. on the whole not a bad finish at all, just a could of tiny areas that need a little sanding for a faily blemish free finish.

Zoom 1 (Interceptor) by CB90 Commander   Posted: 1 month ago
Zoom 1 (Interceptor) Mono boat. Built from a Glassfibre hull, brought on Ebay for £35 the hull is a slim mono racing type with a self-righting side cabin it runs a 1400W 14V 2958 4200KV Brushless Motor and 29-S Water Cooling Jacket with additional air cooling fan. I did not want to use a flexi drive as high maintenance and prone to failure so the shaft runs via two universal joint one at each end. the propeller is a 38mm copper alloy The ESC is a 200W and water cooled the twin rudders supply separate water one for the motor and one for the ESC. The rudder are positioned to reduce prop-walk and are hinged to prevent damage if hit a object in the water and ride adjustment. Turn fins and trim tabs for ride adjustment were provided by a spares kit for another boat. also foamed and added an inner sealed hatch, a rubber bump strip and safety loop.

Up Grade NDQ speed boat by CB90 Commander   Posted: 1 month ago
This is not a build but a modification of a cheap Chinese boat just for fun, I got a bit bored of scratch building projects as they take so long especially as I am not retired yet. The NDQ 757 Coastal Brother 1:25 Radio Controlled Racing Power Boat cost about £25 each from Amazon. These boats have a basic 27mhz radio and two 380 type motors which have forward and reverse and you steer by powering one motor or both for straight ahead. I bought two of these boats as they are light and about 24 in long, one to convert/upgrade radio, esc and brushed motors. The second was to upgrade radio, esc for brushless motors. The brushed motor version I put in two higher rated motors (390) with cooling fans built in, but same motor diameter but longer body I had to modify the mounts, kept same couplings and shaft/propellers. I did remove trim tabs (fixed) and replaced the straight running adjuster for a racing rudder. The brushless version is the same but has brushless motors 2x 2845 2600KV sensor less Specifications: KV(RPM/Volt): 2600KV RPM: 50000 Max Current: 42A The boats ran well but trimming needs attention, as hull is curved up at the back so trim tabs down, to prevent proposing, in-fact at one stage the boat left the water, but need to distribute weight towards the bow. Tried on 3S (11.1v) for brushless went well but got slightly hot after 10 mins. 7.4v for brushed also got slightly hot after 10 mins., and went nearly as well as the brushless. Surprised!!

WWII Italian MAS 562 by CB90 Commander   Posted: 1 month ago
MAS 562 (Motoscafo Armato Silurante: Torpedo Armed Motorboat) While Browsing the internet I came across a free plan dated 1969 if a Italian Motor torpedo boat I found the craft interesting as it had a stepped hull, and this looked like a challenge, so more research and historical digging. Built in 1941 by Baglietto, Varazze: built of wood (mahogany). Baglietto, Varazze: built MAS 561 through to MAS 570 MAS Baglietto class 500, 4th series" Displacement 27.8 tons Displacement max 28 tons Length 18.7m Width 4.7m Draught 1.5m Propeller shafts 2 Machinery Isotta Fraschini petrol engines and Alfa Romeo or Cararo cruising petrol engines Power, h.p. 2000 or 2300 / 140 or 100 Max speed 43 to 46 knots Fuel tank 1.5 tons Endurance 350 nautical miles at 42 knots Armament 1 x - 13.2/76 or 1 x - 20/65 Breda 1940, 2 x 450mm Torpedoes , 6 - 10 x Depth charges Crew complement 13 persons MAS 562, was captured by Germans 9/9/1943, transferred to RSI, was painted in disorientation camouflage, was captured by American PT' boats on June 30, 1944 and PT 306 towed the prize into Bastia. It was painted in disorientation camoflarge It is one of the few to have survived the war and passed to the Italian Guardia di Finanza in the 1950's. In 1940 there were 48 MAS 500-class units. The plan shows the gun on a box platform not the case on the real boat. Making this boat so small has been a bit of a challenge. Running gear 2x Graupner 600 8.4v about 70watts each at rated voltage. 2x shafts 2x opposite turning propellers (2 or 3 bladed) 3 blades on real boat. 35-40 mm 2x ESC 1 or 2 Batteries The Model after studying plans and photographs I could see a few things that I could add to the plans. A cambered deck A revised transom shape (not square) Two propshaft and two electric motors with air cooling. A reduction in the number of frames /ribs as the boat I was going to make was only 29in (83cm) long. the three main problems with the hull where :- the new frame positions and the thickness of the stringers the wood I used was too thick 12mm x 6mm for a small boat Correct gun and position. The Hull is now skinned I will upload some photos soon.