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>> Home > Tags > voltage

voltage
battery voltage
voltage
Taycol Supemarine Resurrection by RNinMunich Fleet Admiral!   Posted: 3 days ago
Mornin' John, agree re chromite, but still don't know what chroDite is! I only personally own the one Taycol Target. I got into this whole Taycol business while I was renovating Dad's old Sea Scout last year and decided I wanted a bit more Oomph so upgraded it to a 1000kV brushless, which gives goods results on a 3S LiPo. See the vids I've posted of the the 'Sea trials' (Lake Trials!?). So I decided to use the Target in the ancient Billing Boats Danish fish cutter I'm restoring and converting from static to RC. Figured the Target would cope OK with the plodding pace of a fish cutter😉 BUT, I wanted it to be reversible without cumbersome external switches or relays as recommended by Taycol / Keil Kraft in those days. After surfing around a bit a found a website where others had tackled the same problem. Looked at their solutions and refined them slightly. All I do is rectify the pulsed (square wave) signal from the ESC with a bridge rectifier (4 hi-current diodes in a bridge form in one package), apply the + and - outputs from the rectifier to the field coil so that it produces a constant magnetic field just like the permanent magnet of a canned motor. The two alternating (pulsed) outputs of the ESC are applied to the AC (~) inputs of the rectifier, which go + / - or - / + according to the command from the TX, I apply to the brush terminals just like a normal brushed motor setup. The output of the ESC is a train of either positive of negative going DC pulses. Pic 2 the positive train on the scope. Pic 3 the negative train. The larger and wider the pulse the higher and longer the voltage is applied and the faster the motor spins. So called Pulse Width Modulation (PWM). The gaps between the pulses are smoothed out by the inertia (flywheel effect) of the motor, and anything hanging on it - like a prop and a few million gallons of wet stuff 😁 Hey presto, a field coil motor that runs forwards or backwards on command 😊 Main thing is simply to separate the field coil from the armature coil (i.e. brush gear) so you can control each one independently. No rocket science but highly satisfying when it all comes together and works on the pond. OK, I'll look up Mr Lynch, wasn't he the Sarge in Z Cars 😁😁😁 Cheers, Doug 😎

54" long Cervia tug. by tysonyoung Petty Officer   Posted: 13 days ago
My Cervia was ready built. I have replaced the Electric motor with a large servo motor (Brushed) .Direct drive and being heavy helps with ballasting. lead acid gel cells are power source. Motor rated voltage24 v but run it on 12v . low rev high torque no load current 1 amp. Shaft diameter 0.5 in. Gives some idea of power out. Being servo motor (ex computer drive 30 years old) well balanced no vibration. Photo near shore shows power of motor.

Launch ELAINE, by RNinMunich Fleet Admiral!   Posted: 17 days ago
Hi Colin, As discussed on the phone; 2V grid bias, 90V anode supply! In those days they had 90V dry batteries, they musta run it 'sumow'! 😁 Don't give up so easy! Nowadays how about a 24S LiPo? Or even Martin's 'big box' solution. http://www.batterysupports.com/lion-lipo-nbsp-88v-nbsp-24s-c... 24V chargers / balancers won't be cheap though🤔 2V is no sweat; 2V SLA, a la Glow Plug starter. How big is the boat an' how much weight can she carry? My first car radio was an ancient Echo valve job, with an inductive inverter bolted under the dash to produce the 90-100v for the bottles. Took me ages to find a way to mount it so it didn't make the whole dash hum like a swarm of bees😲 Later there was briefly a generation of 'low voltage' valves. Soon superseded by transistors from 1948 on. (And NO I'm not pre '48 vintage, well not quite!😉) Looking forward to your progress reports. Would really love to witness one of your displays. Please keep me posted about dates. All the best to you both, Cheers, Doug 😎 PS building a transmitter to match won't be easy. A TX on the right frequency is relatively easy, the tricky bit is the 'modulation' for the control functions! Hats off to your guy 'up the road' if he manages it! I'd really really love to see THAT!

SLA Batteries! by RNinMunich Fleet Admiral!   Posted: 17 days ago
Ed, What you are writing makes no sense whatsoever!😲 Where are you measuring these voltage swings? PM or mail me a sketch of the set up and wiring in your boat with photos showing all power connections please. Are you sure the batts are in series? Something's very peculiar somewhere. SLAs only go reverse polarity, and then not much, when they have been deep discharged and then neglected for a while. But they NEVER recover and come back from that! Cheers, Doug 😎

Schnnelleboot Battery by Kipper Sub-Lieutenant   Posted: 18 days ago
Not necessarily, it would depend on the amount of current your 3 motors would draw & the voltage + ah rating of the battery. For instance, my tug has 2 motors - 2 esc - 2 sla batteries, they make 2 separate systems, port & stb, so if I lose one side, I can still tug with the other. They would both run just on 1 battery if that's all I put in the boat, but using 2 batteries saves me having to use a lot of lead for ballast.

HMS Sabre, Scimitar-class preceded by Archer-Class by CB90 Fleet Admiral!   Posted: 21 days ago
[Score: 5/10] 26"/1400g HMS Sabre, Scimitar-class preceded by Archer-Class Capable of 12mph and a runtime of 15mins Single Propellor (3 Blade 35mm) Direct Drive Powered by LiPoly (7.4v) 3Amp/h Batteries Controlled Through China 60A (30Amps) ESC - Comments: Just finish this little boat, need to have its first trial on the water to measure current draw and perhaps modify the prop size. Make sure water cooling works, and the thing steers ok, as rudder is off set. and may have to be move into the prop wash. The Motor 3650 4Poles 3060KV Brushless RC Motor for 1/10 RC Car Boat 1. 4Poles design, high torque and high efficiency. The overall efficiency exceed 90 percent. 2. Low heat production, long lifetime, strong overload protection and it can function 95% of its features without any heat sink appliance. 3. High quality materials adopted: high intense aluminum alloy anodizing shell , front and back cover , high-performance temperature-resistant magnetic steel and imported high-speed bearing. Specifications: Model: XTI-3650/4.5D Dimension: 50 * 36mm KV(RPM/V): 3060KV Poles: 4 Max Power: 1300W Max Voltage: 19V Max Amps: 68A Shaft Diameter: 3.2mm Shaft Length: 15mm Connector: 5.0mm Banana Connector. The real boat Builders: Halmatic Operators:  Royal Navy Preceded by: Archer class In commission: 2003 – Active: 2 General characteristics Type: Patrol boat Displacement: 24 tonnes (24 long tons) Length: 16 m (52 ft 6 in) Beam: 3.1 m (10 ft 2 in) Draught: 1.2 m (3 ft 11 in) Propulsion: 2 × MAN 2480LXE diesels, 2 shafts Speed: 32 knots (37 mph; 59 km/h) Range: 260 nm (480 km) at 19 kn (35 km/h) Complement: 5 (1 officer, 4 ratings) Sensors and processing systems: Racal-Decca Bridge-master 360, I band navigation radar Armament: 2 × General purpose machine guns (stern-mounted)

1.5v AA Li-Fe/Li-ion/Li-po batteries by RNinMunich Fleet Admiral!   Posted: 25 days ago
OK, found some! https://www.ebay.com/itm/8pcs-JUGEE-3000mWh-1-5V-rechargeabl... Interesting that they all quote mWh instead of mAh! I.e. energy instead of capacity! Power being V x I (Amps) divide the mWh rating by the nominal voltage to get an approximation of the capacity in mAh. Saves integrating across the varying voltage during a discharge cycle, i.e.'On Load' 😉 Thus these 3000mWh cells seem to have a capacity of around 1800mAh. Which is considerably less than the typical 2500mAh of an alkaline or NiMh AA cell. Also, to produce the output voltage of 1.5V from 3.7V Lithium chemistry the cells have an internal voltage regulator, which also must consume some power, albeit miniscule. Something else which can go wrong🤔 Summary; yer pays yer money and takes yer choice! Seem rather expensive to me for what they deliver. Depends what you want to use them for. Might be useful in my Sony camera but I wouldn't use them for any high current load in a model. OK perhaps for LED lighting circuits which only need a few tens of mA. Here a list of battery types, sizes and chemistries for reference. https://www.wikiwand.com/en/List_of_battery_sizes#/overview Cheers, Doug 😎

1.5v AA Li-Fe/Li-ion/Li-po batteries by RNinMunich Fleet Admiral!   Posted: 26 days ago
Yes, I'd like to know that too! Please post links where you found them. I'm intrigued by batteries which seem to contradict the chemistry used in them😲 LiFe (LiFePo4) cells have a nominal voltage of 3.2V. Li-Ion have a nominal voltage of 3.6 to 3.85 V, They are a derivative of LiFe, which simply defines the metals used in the positive terminal; lithium + a Ferrous compound and carbon. Used in electric cars, military and aerospace. LiPo (Lithium Polymer) have a nominal cell voltage of 3.7V. They are also a variant of LiFe. The 'polymer' part simply refers to the material of the separator used to prevent electrode particles passing from from one to the other. It only allows Ion exchange, i.e. current flow. Hence in effect you can regard all of these rechargeable Lithium types as 'Li-Ion' batteries. Used in Laptops, notebooks, mobile phones / tablets etc, and of course RC models😉 There ARE 1.5V Lithium batteries, Li-FeS2, BUT they use Lithium metal as the anode and are NOT rechargeable!! Nominal voltage 1.4 -1.6V. Used as a high current, long storage life substitute for alkaline AA and AAA cells providing about two and a half times the energy of the alkaline. Similar not rechargeable chemistry, using other compounds of manganese (most common), copper, iron to name but a few, is also used in typical 3V Lithium button cells. 1.5V rechargeable suggests to me an alkaline battery, produced by RAYOVAC some years ago. I still have a few of their C size cells kicking about. Don't have a very good 'power to weight ratio' compared to modern LiPos though.🤔 Cheers, Doug 😎

Mahogany in Scale by RNinMunich Fleet Admiral!   Posted: 1 month ago
Neither can I Martin! "The transmitter used two vacuum tubes wired as a multi-vibrator with a tank circuit to constrain emissions to somewhere near the 27 M/cs band (same as MHz, but that name came later). With not a crystal in sight, transmitter frequency drift and battery voltage drain was a problem, so careful tuning just prior to short flights was the order of the day." http://www.modelenginenews.org/cardfile/ed_radios.html#3 Cheers, Doug 😎

Graupner Jumbo 540 motors by RNinMunich Fleet Admiral!   Posted: 1 month ago
Hi Will, Sounds good to me👍 I like the Action Electroncs stuff as well, have their dual ESC with rudder mixer which I want to try in my long thin destroyer to reduce the turning radius. Was misled about the SLA by a previous post🤔 Makes sense re the BEC which I believe is 5V 1.2A. I prefer a separate RX batt anyway😉 BUT: if you run a 6V NiMh down to 5.6V you are close to the Deep Discharge zone which will seriously damage the battery and drastically shorten it's life 😲 Threshold voltage is 1.0V per cell, so take erratic control as a warning that the battery is flat and come home soon! Look forward to your Sea Trials report. Cheers, Doug

Graupner Jumbo 540 motors by Will-I-Am Sub-Lieutenant   Posted: 1 month ago
Doug, The 6volt battery is currently an NiMh battery not an SLA. The problem was that according to Mtroniks the minimum voltage to the ESC to adequately run the BEC connection is 6volts. That is why I was getting erratic control when the battery voltage was 5.6 volts. The action speed controller will work 2-12 volts and I am going to use a separate receiver battery as suggested by Dave Milbourn just to make sure. Regards Will

Graupner Jumbo 540 motors by CB90 Fleet Admiral!   Posted: 1 month ago
I think it would be worth the risk of running the DC Motors at 7.2v (NiMh) or second choise 7.4v (Lipo) and get rid of the 6v lead acid battery. The chance of damaging the motor is limited, the battery packs will be lighter than an equivalent lead acid, but will need to by a charger as well. Always put a fuse in line rated 5 amps below that of the ESC. Or buy two higher voltage motor? only £6.99 each plus P&P link copy and paste into browser address:- https://howesmodels.co.uk/product/graupner-speed-600-8-4v-mo...

Old Futaba servo wiring... by RNinMunich Fleet Admiral!   Posted: 1 month ago
BTW John; Re LED testing: Yes I also use the 'diode' function of my multimeter to do a quick 'will it? won't it?' check. BUT that only tells me it works. With the tester I can determine the optimum current the LED needs, and thus the dropping resistor for any given supply voltage. Above a certain current, usually 20 to 30mA for the 3 and 5mm types, depending on type and colour, more current just produces heat instead of more brightness. Pic shows my tester, only few quid😊, see mA scale along the top! Runs off a 9V block. Cheers, Doug 😎

Cheap motor for a quick fit, but what prop gents?... by Westquay Fleet Admiral!   Posted: 1 month ago
Bon appetites, mon Braves. I have stopped doing Vincent heads (my neck feels like it'll break) and started looking for stuff. The Supermarine is, I hope to hopes, in the loft. But, whilst looking for the drill motor, I found the speed 400 from the electric Ugly Stik aeroplane. I'm wondering if that will power the Sea Hornet. Not sure what voltage they run at, so I'm orff to check that out. Also found the Hornet II model I carved in the hope I could get it scanned and sections (i.e. frames) made. 2 down, 2 to go! Fingers crossed. Cheers, Martin

Cheap motor for a quick fit, but what prop gents?... by RNinMunich Fleet Admiral!   Posted: 1 month ago
Mornin' (😲) Martin., First off; the Hornet ain't mine, wish it was 🤔 I had a look on the Lesro Models site to get an idea of what the prop would have to shove! Was surprised to see it is my hull with a different lid! The current kit is 80 quid BTW. To the motor / ESC; Yeah, you could use an 11.1V LiPo on that motor. BUT your ESCs probably are not LiPo SAFE! Which means that they won't have an automatic shut off or slow down function for when the battery is getting near it's Suicide voltage; roughly anything below 3.0V. Some say 2.7 but I don't risk that. So you would have to be cautious on the first runs and frequently check the remaining volts to learn how long you can run before you risk damaging the LiPo. If you can squash it in how about a 12V 10 cell NiMh? That should give you a good turn of speed with the 35mil prop. Bit heavy though🤔 I use an 11.1V LiPo in my Sea Scout with a 1000kV brushless. i.e. ca 11.100 rpm full bore, and that lifts her snout quite well as you have seen. Hope you find the motor, you seem to make a habit of 'mislaying' motors! Have you found the Supermarine yet? Apropos Supermarine; I've just been asked to renovate one 😉 Looking forward to that so I can see it's coil construction first hand. Will help me refine the mod instructions for you.😉 ESCs; mail me any printing on them and photos and maybe I can identify them and their capabilities. The switch makes me think maybe they do have BEC! The leads don't go nowhere cos it's only there to switch on the ESC / BEC. In my experience only ESCs with BEC have such a switch. Easy way to find out; set up an RX with a servo, plug the ESC lead into the RX, stick a battery on the ESC WITHOUT motor, switch on the TX and the ESC (move the switch to the end where two wires are connected) and see if the servo responds to the TX or any LEDs flash on the RX. Or just measure the volts across the red and black wires on the RX plug! If the ESC has a heat sink I don't think you need worry too much about current capability. Use your natty new Wattmeter to measure the current drawn by the motor as you run it slowly up to full speed. 😉 Don't think you need worry about volts either; all but the teeny weeny ones (like the fingernail size 3.7V ESCs I just bought for my Plastic Magic ships with only a 1S LiPo supply) can normally handle at least 12V, it's current that usually kills 'em😡 Sorry; Your electro-boards are still here, haven't been too mobile lately🤔 So I ordered some prepaid DHL labels (arriving Thursday) and will then get them to collect your parcel from me. Will email when they're finally underway. Cheers, Doug 😎