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>> Home > Tags > cooling

cooling
cooling
Allen Screw Removal by onetenor Fleet Admiral!   Posted: 13 hours ago
Thanks chaps. All good ideas some of which will try. It has to be remembered I am chair bound so working "a la main"so to speak. Heat and oil /cooling has been tried. A very hot radiator to hand LOL. about 85 C. I think ball burrs could be the answer. They will cut through stainless.Eventually. Keeping flat mills central may be hard without a press of some sort. No current access to left handed drill unfortunately. I'll get there one way or three.😁👍

Vosper by Biscuit Sub-Lieutenant   Posted: 9 days ago
[Score: 10/10] 42" Vosper Single Propellor (3 Blade 50mm) Geared to a Os 40 fourstroke (3 Blade) - Comments: I always liked the sound of a fourstroke engine so I thought I would replace the brushless motor in this boat with an aircraft Os 40fs which I converted with a water cooling jacket that I turned up on my lathe. I also made a reverse gearbox with a clutch, the gearbox is operated by a servo and works well, I also fitted a water pump so could still cool the engine while ticking over stationary, boat has been weathered and is fitted with lights and a searchlight that swivels around operated by another servo, there is also a cooling fan above the engine just to help keep things cool.

BRAVE BORDERER - BRUSHLESS SUMMARY by jbkiwi Sub-Lieutenant   Posted: 9 days ago
I used this pump from E Bay which pumps well, and with the rubber mounts is quiet. 6-12v (I use a 2 cell LiPo which seems perfect) and am cooling 2 2000kv 28mm in-runners. Have tried a few different pumps and these have been the best so far. You have to be careful that you don't over pressurize your plumbing system, as if the hoses come off while running you can fill your boat up in no time. It's safest to adjust your pump voltage or piping to a 'neutral' pressure rather than risk hosing down your electrics. I used twin pick-ups behind the props and separate feeds, one for the pump and one direct in case the pump stopped or blocked.

BRAVE BORDERER - BRUSHLESS SUMMARY by RHBaker Fleet Admiral!   Posted: 10 days ago
The pump was installed to give positive water flow even when stationary. Felt this would ensure cooling under most conditions. The plumbing is quite torturous and suspected there might be a significant head drop in the circuit. With the wisdom of hindsight, probably overkill; the water scoop between propellers may prove adequate.

Brushless motors (again) by Haverlock Fleet Admiral!   Posted: 17 days ago
depending upon the type of motor cooling it can be a problem. Most brushless motors are out runners so the case rotates! In runners are usually for higher speed applications (or driving a gearbox). If you have an idea as to the size of IC engine the boat was intended to have then this list may be a help .049 or .051 = 100 watts 0.10 = 200 watts 0.15 = 300 watts 0.25 = 500 watts 0.32 = 640 watts 0.40 = 800 watts 0.45 = 900 watts 0.51 = 1020 watts 0.61 = 1220 watts 0.75 = 1500 watts 0.91 = 1820 watts Since Watts are Volts * Amps ( I know this is not accurate for a reactive load like an electric motor but its a rule of thumb) This gives you a ball park next point is the KV ( revs per volt) of a motor. The higher the KV the smaller the prop. Finally buy a Watt meter they are not expensive and give you a chance to " fine tune" a setup. https://www.ebay.co.uk/itm/FT08-RC-150A-Hight-Precision-Watt... Car ESCs ( usually) have a reverse function while the airplane versions do not. They are generally cheaper than boat specific ESCs.

Kingsmere Model Boat Club by BOATSHED Fleet Admiral!   Posted: 1 month ago
I do have several model boats with both petrol and nitro engines in them. One I have is a 48" PPT109 with a 26cc petrol engine and the exhaust has the water cooling going out via that way. It runs at a pleasant hum rather than the normal engine sound. It is a lot quieter than someone using a petrol lawn mower or a petrol strimmer. It is even quieter than most brushless model boats. Yet I am not allowed to use it on a pond on Blackheath just because of it's fuel system. I'm told that it's due to sound rather than fuel. The local council have a ranger that comes round and give you an £80 fine if you are caught using one. I find this totally stupid when they use petrol lawn mowers and strimmer's to keep the whole of Blackheath's lawns cut. I have a Proboat Miss Geico tunnel hull model boat and the motor screams when it's running but I'm allowed to run that on the pond.

20th Scale ELCO 80ft PT boat part 9 by CB90 Fleet Admiral!   Posted: 2 months ago
Hi thanks for your input The pictures do not show the mini fans now attached to each motor which were robbed from PC cooling fans. The boat is not a performance craft I will hopefully only pull 20 to 30A from each of the low kv motors. Spec. 2808 1400KV 14 Poles Brushless Motor Max Watt: 350W Voltage range: 7-15V Max amps: 35A No load: 1.2A

BRAVE BORDERER by jbkiwi Sub-Lieutenant   Posted: 2 months ago
Just put up another vid showing the speed at around 2/3 throttle which looks reasonably scale for 38 knots (bit hard to scale water movement as we all know!) and it doesn't squeal too much at this speed. Just been back through my old info on the ESCs and found I may be able to change a few things (forgot due to approaching dotage and so many projects on electric (18 planes as well converted from ic to electric) I was thinking with your high kv motors that if you can get away with smaller props or some the scale diam bit finer pitch props, that would allow the motors to rev how they should, but give you finer control. As I mentioned before, on 8v per motor they will spin at around 16-18000 rpm and won't like a big load (you've no doubt heard those delta wings scream) . My props are 28mm x 3 blade on a 2000kv motor and are spinning at around 12000 rpm (probably around 8000 rpm in the vid at 2/3 throttle) The general rule with brushless is the higher the kv the smaller the prop/pitch and vice versa planes or boats (would also apply to brushed) If you have an in line amp meter/batt checker you can check the amps drawn in the water at full power (have someone hold the boat) and see if you are under max A for the motor. You can then prop to suit if necessary. This is the only way to check for correct load and is an absolute must for aeroplanes. After a run, motors should be around cool to almost too hot to touch (60-70deg C) There are backplate water cooling units available for using out-runners in boats if necessary eg pic.

20th Scale ELCO 80ft PT boat part 9 by jbkiwi Sub-Lieutenant   Posted: 2 months ago
I would check out the water cooled back plates for the out- runners as they will possibly run real hot if at all loaded up without cooling, unless you have fans like aircraft propellers (even then and in open air they still get hot!) I would look at this seriously to avoid cooking your motors. Hobby King usually has various cooling parts, or EBay, Aliexpress, Banggood etc. Bit late now I suppose, but water cooled in-runners (around 2000kv 28mm diam) are a better idea for boats. You can buy in-runners and water jackets to fit them as I did but they need flushing after use with CRC or similar to avoid rust, (I'll be copper tube wrapping the next lot, then there are no worries)

motor sizeing by canabus Fleet Admiral!   Posted: 2 months ago
Hi Jim I used a Hobbyking D3548/4 1100kv , a car ESC (hk60A-SL)(electric fan on top for cooling), program card(HK PROG-CARD) and a 40mm 2blade prop(test out the one on the boat first). Battery a 3s 5800mah 30C Lipo. This is in my Sea Commander and gives a good turn of speed with a long run time. ESC set up:- 1 Cutoff Voltage for 3S=10.2 and 4S=13.6 2 Start Power Percent=5% 3 Advance Timing=4 4 Run Mode=2 5 Brake Force=1 6 Drag Brake Force=1 7 Neutral Range=1 8 Initial Brake Force=1 9 Reverse Force=1 Canabus

motor sizeing by jimdogge Chief Petty Officer   Posted: 2 months ago
Hi chaps jim dogge here, im just about ready to fit out my wave princess with some sort of motor and bits. I have allsorts of outrunners and ESC to match aeroplanes but havent a clue as to where to start. A 1.5 diesel, whats that equivalant too is the weight thrust formula the same for boats. l would prefer to stay with out runners, the cooling aspect is no problem l did it for a living. a prop size how is that worked out for a boat.

BRAVE BORDERER by jbkiwi Sub-Lieutenant   Posted: 2 months ago
If you are using 2 ESCs/BEC/UBECs with 2 plugged into 1 receiver you should remove the red wire from one of the plugs and tape it back to the lead, as both plugged in will possibly supply too much voltage for the receiver (you are getting double the voltage from 2 different sources) and this can cause the ESC to stutter . You should have no problems with Brushless out-runner motors as with the correct match with the ESC they should be as smooth as brushed. I have dual 2000kv 28/45 in-runners (with water jackets) and twin ESCs and 2 sound units using 1 receiver in my 64ft ASR model with no problems regarding proportional control (fwd or rev). I had a 28mm O/R in a Maiami ASR and it would crawl along (but the high noise was ear wrecking so have changed it back to brushed for now. I do have a similar slight high pitched squeal at certain speeds on one motor and this may be caused by the particular motor not 'syncing'properly with the ESC (Chinese cheap ESCs and HobbyKing /made in china motors) but short of changing that motor and ESC I am just putting up with it for now. The high pitched sync noise is fairly common and sometimes not fixable, (a number of my larger planes do it and its audible from 100m away (also amplified by a hull,-nice sound box). It can depend on the way a particular motor is wound (no 2 are identical) or even magnet placement/timing, as the may be hand wound by 2 very nice Chinese ladies at different ends of a bench ( just read some of the Hobby King motor reviews ) You could try changing the frequency on the ESC if it has that option as a higher motor Kv sometimes requires a higher frequency. Also make sure your ESC is set to the correct battery cell count. If it has an auto setting that should usually work best for general applications unless you are running fancy motors. Regarding interference, make sure you keep your aerial as far as poss from the motors and ESCs (even on 2.4 - I put mine right up in the bow) and there should be no problems. I have had 2 twin engined boats (my MTB & ASR) 1 brushed and 1 brushless running side by side 10" apart using the same radio for both (same type of Rec in each boat) with no problems at all. The bow down is probably prop shaft angle (the shallower the better) but if you are using counter rotating props you could try swapping props (inward rotation to outward) and motor rotation to see if it makes a difference. Also with 2800Kv motors you should be using small props (around 28-30mm diam 3 blade) as these motors are made to rev) as on a 2s battery they will be turning at around 20,000 dry and perhaps 18,000 wet (depending on prop) and if you load them too much they will cook with no cooling (assuming they are around 28mm dia ?) Only other thought - silicone couplings will squeal real loud if they slip.

S.H.Grainger Formula Powerboat by vortex Sub-Lieutenant   Posted: 2 months ago
Hi Steve im not sure now regarding motors as they have water cooling cans on but Surfury runs from memory a 1075kva motor Turnigy 160 A speedo watercooled on 2x2s 5200 lipo`s in series ie 14.4volts with 52mm mocom Alum prop approx 3hp. I think the Tornado has approx 2045kva motor same speedo + lipo`s x 50mm nylon prop both do scale speed to as fast as 40/61 IC and look great on our choppy water with just prop and rudder in the water. Both motors will take 6s if you like ballistic? All gear from Hobby king. Try the IC first, post some pics please

Taycol Supemarine Resurrection by Colin H. Fleet Admiral!   Posted: 2 months ago
Evening Doug, Just a thought, as this motor has shafts either side of the motor, I was thinking of fitting a fan on the non-drive end for cooling, would this be feasable or isn't it likely to be needed. Cheers Colin.

Launch ELAINE, by onetenor Fleet Admiral!   Posted: 2 months ago
Diesel and Methanol in an engine. Did you need a battery . If not you've solved a problem we've been trying to sort for years.How to run model diesels without Ether. What were the proportions and will it need a lube oil? Re the cooling jacket I'd be inclined to leave it alone. If it is over the original head👍damn the keyboard is on a go slow i'll have to unplug