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>> Home > Tags > volts

Graupner Jumbo 540 motors by Will-I-Am Petty Officer   Posted: 11 hours 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

Cheap motor for a quick fit, but what prop gents?... by RNinMunich Fleet Admiral!   Posted: 4 days 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 😎

Graupner Jumbo 540 motors by Will-I-Am Petty Officer   Posted: 11 days ago
Help required please, I have two Graupner Jumbo 540 6volt motors in an eboat circa 1978, I had fitted an Mtroniks speed controller replacing the Bob's board only to find that when the voltage dropped below 6 volts down to 5.6 volts I was experiencing intermittent operation of the esc. I have been informed by Mtroniks that the minimum voltage for operation of the esc is 6volts. Graupner have also confirmed that the maximum voltage for the Jumbo 540 motors is 6 volts. Do I have any alternatives other than refitting the Bob's board?

Range Safety Launch? by canabus Fleet Admiral!   Posted: 12 days ago
Hi The 382 was a Fire Float Mk1(40 foot) (No. 90) converted in Feb 1950 to a Seaplane Tender. Max speed 21 knots. The MFA 800's are 5167 rpm( unloaded) @ 12 volts/ 5.3 Amps. Replacing these with 3639-750Kv brushless on 2S Lipo batteries(7.2 volts) would give you 5400 rpm( unloaded). 2S 4000mah 25C Lipo's(one for each motor) weigh 221 grams each. Canabus

Martin's Taycol Conversion Boards by RNinMunich Fleet Admiral!   Posted: 18 days ago
"And there's me hates electrics. " Electrics are like the fair sex; Ya can't live wiv 'em, and ya can't live wivout 'em!😉😁 Most important thing the Wattmeter can do is help you look after the batteries properly, especially LiPos. Worth every penny. Your old caretaker was dead right. You can hang on to a Van der Graf generator producing a several hundred thousand volts but the current is so weak that all that happens is your hair stands on end!😲 😎

Martin's Taycol Conversion Boards by Westquay Fleet Admiral!   Posted: 18 days ago
As to knowing the bigger motors, I have never run the Double Special and the Supermarine was normally on a single 6volt Lantern battery. Only occasionally on 2 lantern batteries to appease my Dad's need for speed, but an oyster bed was not really big enough for 12 volts and REP single channel bang bang RC! Beyond that and the wonderful noise it made, I know nothing, I'm afraid. Martin

Martin's Taycol Conversion Boards by Westquay Fleet Admiral!   Posted: 18 days ago
Fantastic stuff, Doug. That gizmo on the right with 0.05 and 6.0. Is that Amps and volts? Is that really just 0.05 amps with the motor running?! Does that really mean just 0.3 watts? Would the model even move? Ah, but then that's off load, innit? Stick a 35mm 3 blader on it and what would it draw in the wet stuff, I wonder? OK, I'll get a bloomin watt meter. Least I can do I suppose Impressive on the videos, too. Ain't it quiet? My Taycols growl at me, but then so does the Mrs.! I'm gittin' excited now. You have to need some brass bashing, so I can thank you properly for all the work. Cheers, Martin

Graumpner eqivilant replacement by canabus Fleet Admiral!   Posted: 18 days ago
Hi MikeP The Torpedo 800 is 5167rpm@ 12 volts and the diameter is 52mm. Canabus

LED Tug Mast Navigation Lights by figtree7nts Fleet Admiral!   Posted: 26 days ago
Hi Doug, I'm going to work on the Brooklyn's light's. After I complete her! The wires are going to be in her main cabin. So, will work on the lights last! Will be using two 9 volts for two separate lights!👍

Gina 2: A Messy Business - Hull Restoration by RNinMunich Fleet Admiral!   Posted: 1 month ago
Evenin' Mike, Glad you found it interesting😉 The details of the motor conversion are in my Sea Scout renovation blog but the essentials are- All modern ESCs provide a DC output in the form of pulses which are rapidly switched on and off ( several thousand times a second). That's what you can see in the scope pics. The scope timebase (width of one horizontal division) is set to a little less than 1msec so you can see how fast the pulses are switched and how the pulse width (ON time) varies. The inertia of the motor keeps it going during the few milliseconds of 'Off' so the ratio of ON pulse to OFF determines the speed of the motor. The signal from the TX varies this ratio by varying the ON pulse width of the ESC output in proportion to the throttle stick position. A Bridge rectifier is simply 4 diodes arranged in a square (see pic) so that it has 4 terminals; +, - and two AC (~). When an AC signal is applied between the two ~ terminals a DC voltage of constant polarity appears at the + and - terminals. The rectifier sees the ESC output as an AC signal and produces a DC output at the + and - terminals. All I do is apply that constant DC voltage to the field coil of the motor, thus creating a constant magnetic field as if it was a permanent magnet. This means doing a small mod to the motor to separate the field coil from the brush gear and rotor (armature) coil. 3rd pic shows normal wiring of the coils in series. Meanwhile the varying pulsed voltage goes to the brush gear (and thus armature coil) driving the motor just like a normal 'can' motor. No rocket science just a neat trick 😉 The scope just shows the varying pulse train from the ESC to the motor. Zero Volts is on the horizontal centre line of the screen and shows when the voltage pulses are positive (upper part of screen) or negative (lower part of screen) and the motor reacts accordingly. The slight overshoot is probably due to the reaction time of the diodes but the motor doesn't notice that - it's too 'lazy' 😉 Here endeth today's seminar 😁 Hope it's demystified things a little. Cheers, Doug 😎

Which motor by Colin H. Fleet Admiral!   Posted: 1 month ago
Hi Neil I have a 49inch tug which uses a 540 motor with 2.5 to 1 reduction box. 3inch 4 blade prop, On 12 volts pushes along nicely and with a 7amp hour battery gives about 2 hours sailing, total sailing weight is 21 kilos. Cheers Colin.

Which motor by figtree7nts Fleet Admiral!   Posted: 1 month ago
Hi Neil, I use MFA/ComoDrill Torpedo 500. On my Tugs and they have enough power! I use the 2.5:1 g/box at 12 volts. It gives about 13350 rpm's Cheers, Ed

LED Tug Mast Navigation Lights by pittsfieldpete Lieutenant   Posted: 2 months ago
Hi, Doug: Sorry about that. Where power enters the circuit board the reading is 8.08 volts, same as the 7.2V battery pack when it’s fully charged. That sounds like something from an Abbott & Costello routine! 😎😎

What do you do when... by onetenor Fleet Admiral!   Posted: 2 months ago
Morning Doug Yes gotcha. I was thinking heavy magnet like a speaker magnet. OR arrange a relay with a double throw switch to reverse the current and hence the motor. Piece of P-ss for you mate.Just have enough weight to avoid tangles as you strip the line from the reel and fine synthetic string better than fishing line. It is less likely to be pinched in the roll on the drum. Also more scale.You may want a speed controller or esc perhaps. Or just rely on the gear ratio. An old brushed motor would do I think with about 4volts.You may still need a pawl to prevent the load stripping line when power is off the motor. I hope I tickled your little grey cells mon ami. Bon chance👍

Charging NiMhs, one for Doug?... by Westquay Fleet Admiral!   Posted: 2 months ago
But, Haverlock, you get a charge lead with it. I just can't help wondering whether the usual 5 volts on the other end isn't too high, but, like I said, my wife's efags and her phone are charged from the same source...her laptop. Martin