For any questions or comments please leave a comment in the comment box below. For example, a 9000Kv motor would be faster than a 2200Kv motor. kV to volts conversion calculator How to convet volts to kilovolts. PWM signal output function,can directly connect to the ESC for test,no need to use transmitter,more convenient. Quality kv rpm with free worldwide shipping on AliExpress. rpm/v (kv) D2830-3500: Airplane Class: 600g (450 EP Helicopter) Suggested Battery: 11.1v Lipo Battery: No Load Current: 3.7A: No Load Speed (rpm) 39000: Load Current (A) 20A/7.4v: Load Speed (rpm) 21700: Recommended ESC: Turborix Advance 30A ESC: Suggested Propellers: APC7X4: Pull(g):, Turborix 3500rpm/v D2830 RC 450 Helicopter Outrunner Brushless Motor Model Number : rcps81517_3 440 … 30 RPM-sensor strooischijf passend voor Kverneland KV-RS-M in Landbouw / Grasland- & voedertechniek / Zoeken op merk en model / Kverneland / Kunstmeststrooier / KV-RS-M - Kunstmeststrooier / KV-RS-M Bouwjaar -> 2007 - Kunstmeststrooier Up to now, it seems that the new motor with smaller Kv is "worse", but there is a simple solution: just double the input voltage. The voltage V in kilovolts (kV) is equal to the voltage V in volts (V) divided by 1000:. Open Siemens Website. Example. A wide variety of kv rpm options are available to you, such as usage, protect feature, and certification. KV-Diagramm entsprechend der Anzahl der Eingangsvariablen zeichnen. Theoretically. Dazu kommt, das bei uns in Deutschland KV mit "Kilo Volt" schon belegt ist und eigentlich Umin/V die korrekte Schreibweise sein müsst. The high KV motor is suited to racing sport drone, like all kind of FPV. or. Revolutions per minute is a measure of the frequency of rotation, specifically the number of rotations around a fixed axis in one minute. We do a significant amount of research and collect on the web or top pilots, We try my best to test drone components. Lets understand how speed of motor and its applied voltage are related. In order to more accurately meausre the PRM, I suggest that use the professional tool to help. At-Tariq bedeutet „der Weg“, aber auch „der Morgenstern, der den Weg weist“. Its rating (1000kV) means that it will spin at 1000 RPM per volt. If torque can be derived from a KV rating then why is a lower KV rating considered more powerful? 2200 Kv Motor with 11.1v LiPo battery provides 2200 x 11.1 = 24420 Unloaded RPM 220 Kv Motor with 37v LiPo Battery provides 220 x 37 = 8140 Unloaded RPM The key to this motor constant is to know that the Kv value represents an unloaded condition where the value can vary under load. The motor I am using and prop per manufacture recommendation is only pulling 1/3 the amperage the manufacture states is the max the motor can handle. 1 kV = 10 3 V = 1000 V. Volts to kilovolts formula. Hope it helps, as I said there are plenty of good explanations available online if you wish to know more. KV: Kassenärztliche Vereinigung KVG: Krankenversicherungsgesetz (Schweiz) KVK: Krankenversicherungskarte KVT: Kognitive Verhaltenstherapie KVVV: Kontrolle Verbrennungen Verätzungen Vergiftungen: Schnelldiagnose bei Chemieunfall: KZH: Kopfzwangshaltung KZV: Kassenzahnärztliche Vereinigung: analog zu Kassenärztliche Vereinigung (KV) zum Buchstabenanfang … Kv is in units of RPM/Volt. Any feed back would be greatly appreciated. KV is related to the torque level of the motor, what’s the torque? So an 1800kv motor at 5.5 volts will spin at 1800*5.5 which equals 9900 rpm no load. Torque is determined by the number of winds on the armature and the strength of the magnets. For your convenience, below is auto formula to get the value of PRM, just need to enter the kv rating of motor and your battery voltage. share | cite | improve this question | follow | edited Oct 30 '15 at 23:58. rpm/V ist die sog. Considering that KV is RPM/Volt, does it ever tell us anything about the torque? The SCALAR 8 V2 is the consistent further development of our SCALAR 8. If Kv is like horsepower, then Turns is the physical attribute of a motor. Does this mean that I can increase the dia/pitch of the prop to obtain more thrust as long as I do not exceed the max amps over a given time, in this case 60-sec? These motors are controlled by pulse width modulation, hence the three wires. Let’s look at a 1000kV motor. Create a RPM channel using the Generate (maths) channel facility in the Graph Screen, Speed x 'Speed to RPM conversion ratio', You will now have an RPM channel that you can view in the graph screen. You can also choose from home appliance, boat, and car kv rpm, as well as from drip-proof, totally enclosed, and waterproof kv rpm, and whether kv rpm is ie 1, ie 2, or ie 3. Liveticker: Club Brugge KV - Lazio Roma (Champions League 2020/2021, Gruppe F) Fazit:Letztlich werden die Punkte geteilt. Quality kv rpm with free worldwide shipping on AliExpress. The resistance of the windings is fixed (although it will change a little with temperature), so to get more current flowing through the windings, the voltage must be increased. KV-Diagramme für mehr als fünf Eingangsvariable sind eigentlich nicht mehr praktisch handhabbar und deshalb unüblich. voltage torque. A handy tool for checking the KV rating of Brushless Motors. Knowing the Kv rating of a motor is helpful to determine which motor belongs in which aircraft. ”) Specs for a typical brushless motor. Dieser hochwertige und äußerst leistungsstarke Motor wurde im Stator in 12 Segmente aufgeteilt und wird durch seinen 4-poligen Rotor angetrieben. The definition of the Kv value is how many RPM a motor outputs per every volt. Kv, on the other hand, is usually measured in RPM / V, not rad/sec / V. It just so happens that the conversion from rad / sec to RPM requires you to multiply by 9.5493. Volts to kV conversion calculator How to convet kilovolts to volts. 1) Typical Motor Kv 2S (240) Sport - 2,500 Kv 20,000 3S (2100) Prop Jet - 2,200 Kv 25,200 3S (2100) Sport - 960 Kv 11,500 3S (3200) Scale - 740 Kv 8,900 4S (3200) Sport - 740 Kv 11,840 4S (3200) 3D - 1,000 Kv 16,000 6S (3200) 3D - 525 Kv 12,600 No Load RPM Many motors provide a choice of no load RPMs. RPM can be easily converted to km/hr using this online revolution per minute to kilometer per hour Unit Conversion tool. Even nog wat info uit een oud topic opgezocht, gaat vooral over Io, maar is hier ook wel interesant. Lost your password? Spiegelachse. 13 synonymer for kv-diagramm. A handy tool for checking the KV rating of Brushless Motors. ⭐How to convert Hp to kVA in only 3 step. Waar het om gaat is wat het betekend wanneer je het tussen de spec`s van een motor tegenkomt. K2 kv / Drehzahlmesser mit Motordrehzahlverstellung ... Having set the correct magnet pair counts for each motor - the RPM is spot on with the laser and whether I use a 3S, 4S or 6S I get the same Kv value at 100pcnt throttle and guess what - they correlate with the motor specs.. Again, my apologies but i limit to 4 stars for the short cable and wandering pot.. Since we’re at half throttle, 150 of those pulses will be full voltage, and 150 of those pulses will be 0 voltage. At-Tariq ist der Name des neuesten Projekts der katholischen Ideenschmiede kathmedia. KV is in proportion to Volt, 2 volts will rotate twice value of KV. httpsCOLON//wwwDOTosmtecDOTcom/stepper_motor_speed_and_torque_relationship.htm, “In summary, the current and the number of coil turns in the windings determine a motor’s maximum torque output, while the voltage applied to the motor and the inductance of its windings will affect the speed at which a given amount of torque can be generated.”, Your email address will not be published. G to RPM Calculator. Get more information and details on the 'kV' measurement unit, including its symbol, category, and common conversions from kV to other voltage units. It’s used as a measure of revolution of the motor, the most intuitive formulation is that how fast the motor will totate. V (kV) = V (V) / 1000. First you should know how many factors impact the value of RPM? Quadcopter Flight Controller Board Comparison, © Copyright 2017, All Rights Reserved Powered by WordPress. Kv … In a given DCBM, the physical properties cannot be changed during operation. Vergelijk alle Reely prijzen en aanbieders gratis op Power.nl. if i put a heavier camera on a drone that came with a light weight camera will the motors wear out or burn out quicker? You will receive mail with link to set new password. Please enter your email address. 1 V = 10-3 kV = 0.001 kV. Fewer cells (lower voltage) = lower RPMs, bigger prop. 0 feet 5 required npsh 0 20 40 60 80 100 120 flow in gallons per minute 0 10 20 30 40 50 head in feet 4.25"(108mm) 4.75"(121mm) 5.25"(133mm) 5.75"(146mm) 6.25"(159mm) curves based on clear water RPM the full name is revolution per minute. The maximum RPM is also cut by half, so the horsepower is 1/4th of the original. Oder sind bei uns alle auf dem Holzweg? Step 2 (Efficiency x FP) Multiply the power factor by the efficiency of the engine. Its rating (1000kV) means that it will spin at 1000 RPM per volt. All you need to do is measure the correct RPM and the voltage. LEOPARD Brushless Inrunner LBP3660/X2-4D 2380 KV(RPM/Volt) 4S 80A Die neue X-Serie der Leopard brushless Motoren ausgelegt bis 4 Zellen Lipo Akku. This unit can display KV, RPM and Battery voltage. Please enter motor data. Just input the RPM value and the RPM to km/hr converter will automatically update you with the km/hr value. Aber für was steht KV? 1 kV = 10 3 V = 1000 V. or. Best racing drone frame: What factors should you consider? 120 kW . KV is in proportion to Volt, 2 volts will rotate twice value of KV. This is how you can calculate the Kv rating of any brushless motor in the RC world, and it’s quite simple. Just Enjoy Building Your Own Drone. Kv describes the RPM (revolutions per minute) a motor does per Volt that is put into it. [1] KV / RPM meter That approach is to easy and I will count it as serious cheating. For example, a 980Kv motor powered by an 11.1V battery would spin at 10,878 rpm (980 x 11.1) with no load. RPM to km/hr Converter. Kv - RPM Constant. Wouldn't you need to be told the torque separate from the KV rating? Knowing the Kv rating of a motor will help you determine how fast that motor will rotate when a given voltage is applied to it. Great news!！！You’re in the right place for kv rpm. Up to now, it seems that the new motor with smaller Kv is "worse", but there is a simple solution: just double the input voltage. Because as stated, the kv is rpm per volt. Im englischen Sprachgebrauch ist dafür die Bezeichnung "kv" üblich, im deutschen meist "n_s". Thanks KV is the rpm the motor is rated at at one volt, High kv motors need a gear reduction to turn large props and low kv motors run direct props The kv is with no load. Im Gegenzug werden nur die Koste… its possible to buy 4000Kv motors rated for 2S only, and some are rated for 3S. Im Vergleich zu Deutschland gibt es bei der italienischen Krankenversicherung einige Unterschiede. Step 1 (Multiply Hp x 0.746) Multiply Hp (Horsepower) by 0.746. Required fields are marked *. You Are Worthy Of The Best In Life. Meaning if I increase the prop dia/pitch I may draw more amps but I may not gain any additional thrust? Your email address will not be published. 2 ; Bei einem KV-Diagramm müssen die Felder nämlich so angeordnet werden, dass nachher … If a motor is generating 1V per 1650RPM, its Kv rating is exactly 1650Kv. KV is the main parameter of motor, it is measure the speed of motor. Ob zuhause vor dem Fernseher, hier im Internet im Live-Stream oder über unsere kostenlose K-TV App. Or is there a relation of thrust/amps that I need to measure. Regarding voltage: It doubles the torque, the RPM and the motor goes back to the original horsepower. On the other hand, you would use a lower Kv motor in a heavy-lift multirotor because you want to turn a large prop at lower rpm and obtain high torque. It’s another concept of … Als Einheitenzeichen wird der Großbuchstabe V verwendet. Kv. How to calculate motor RPM? there does not seem to be a problem with the drone lifting the heavier load. Kv - RPM Constant. Save my name, email, and website in this browser for the next time I comment. Profiteer Qn = Nm³/h: ρn = kg/m³ : Δp = bar: p2 = bar: T1 = °C °F; berechnen = m³/h. RCF is positively related with the rotor radius and the rotation speed of the centrifuge. A handy tool for checking the PRM of Brushless Motors. Also ist die Verwirrung perfekt. What is the Kv rating of an electric motor? I may actuality acquire less thrust? After testing them we will write reviews and share our experiences on here. Die Finanzierung erfolgt aus Steuergeldern sowie den Zahlungen der Arbeitgeber. The higher the voltage, the faster a motor spins. Kilovolts to volts formula. Since these brushless motors a in reality 3 phase motors, frequency has an influence on rpm at any given voltage. It just so happens that the conversion from rad / sec to RPM requires you to multiply by 9.5493. So, more voltage = more current = more magnetic flux from coil = more speed for a fixed number of turns and fixed magnetic properties. K v staat gelukkig niet voor kilovolt (=kV):smile: doorgaans best wel dodelijk, maar voor velocity Konstante. 949 kv rpm products are offered for sale by suppliers on Alibaba.com, of which dc motor accounts for 5%. This unit can display KV, RPM and Battery voltage. Es gibt keine klassischen gesetzlichen Krankenkassen und somit ist auch ein Krankenversicherungsvergleichnötig. The kilometer per hour is a unit of speed. I proudly present two calculators that can be used for power to the torque (Power to the Torque!) In reality, the manufacturer’s numbers may be a bit … optimistic. You can argue that the DCBM controller for a three winding motor provides a three phase output, but its definitely not the same as your entity supplied 3 phase AC. - 8.5.2008 in Rom sein, um unter anderem sogenannte LIVE-ONLINE Räume zu testen. A low Kv motor has more winds of thinner wire—it will carry more volts at fewer amps, produce higher torque, and swing a bigger prop. Insect-sized robot takes flight: RoboBee X-Wing, Making a Drone with Lego Motors and Propellers, SPECTACULAR STUNNING !!! If you have access to an oscilloscope this might be another way to do it. Kv = rpm/v or rpm = Kv * v Kv is the factor to multiply the voltage to get rpm So motor has a range of voltage that it will run on At half volts the machine should hover What is the power behind the motor in grammes it will lift per Kv… Kv allows you to get a handle on the torque that can be expected from a particular motor. Answer: “Kv” refers to the constant velocity of a motor (not to be confused with “kV,” the abbreviation for kilovolt). KV is a measure of voltage. Wouldn't you need to be told the torque separate from the KV rating? Convert 3 kilovolts to volts: V (V) = 3kV × 1000 = 3000 V. Kilovolts to volts conversion table It doubles the torque, the RPM and the motor goes back to the original horsepower. The maximum RPM is also cut by half, so the horsepower is 1/4th of the original. It would be useful to know the relationship between the RPM at the rated maximum power and the ‘no load’ RPM indicated by the kv figure. (For the tech buffs out there – Yes, voltage does play a part but is not the primary factor in determining AC motor speed.). KV is the main parameter of motor, it is measure the speed of motor. You can also choose from home appliance, boat, and car kv rpm, as well as from drip-proof, totally enclosed, and waterproof kv rpm, and whether kv rpm is ie 1, ie 2, or ie 3. Obviously above brushless motor kv to rpm is very simplistic calculator base on ideal conditions. It is measured by the number of revolutions per minute (rpm) that a motor turns when 1V (one volt) is applied with no load attached to that motor. (100 × 0.746 = 74.6). Fachschule für Mechatroniktechnik Kempten (Allgäu) Regeln zum Aufstellen von KV-Diagrammen 1. Required fields are marked *. Sailplane usage, lunch only. Without any load. Über einen solchen Raum werdet ihr eine andere Art von Unterricht kennenlernen! Great news!！！You’re in the right place for kv rpm. Specs: Working Voltage Range: 9-25V Dimension: 29x 63x 5mm Weight: 35g (wires included) Note: An instruction manual for this item is available from the files tab below. Divide the RPM value by the Speed value i.e. A change in voltage will change the rpm and will require changing the propeller to avoid overloading the motor. KV is related to the torque level of the motor, what’s the torque? This website uses cookies to improve your experience. Kt - Torque Constant. The nominal speed of the motor is determined by the frequency of the AC supply and how many pairs of coils or “poles” the motor has. The SeBy DocKy video review …, The future is right here with us, thanks to the talented tech brains and giants, drones ar…, After researching online I have shortlisted the best Lipo Internal Resistance Meter, which…, Almost quadcopters only flight less than 30 minutes even fewer. The higher the voltage, the faster a motor spins. The Kv rating designates the RPM a motor will spin at full throttle when unloaded given an input voltage. Your email address will not be published. Now add in Volts and you get RPM and then if you change scale size like 1/8 then you need a new chart. voltage torque. G force refers to Relative Centrifugal Force (RCF). You could buy a KV rpm meter such as this one on aliexpress , type in the number of magnet pole pairs, spin the motor and read the Kv rating. 1 V = 10-3 kV = 0.001 kV. Die Italiener müssen damit sicher zufrieden sein. "spezifische Drehzahl" eines Motors. That’s way to easy and no expensive toys are involved… So let’s continue: [2] Oscilloscope. There are also DCBM’s that have two windings, four windings and so on, so any number of wires could be present depending on the motor and its application. It is common practice to use Nominal voltage values for the unloaded RPM. Example. asked Oct 30 '15 at 23:50. For application, the lower KV motor is good for the drone, which is used to carry high weight, like DJI aerial photograph drone Insprise series. In determining the Kv of a motor, is there a certain frequency used to arrive at the Kv rating? These so-called three phase direct current brushless motors are really just three pole stepper motors and the esc’s are stepper drives while the flight controller/radio transmitter combination is a pulse generator/wireless pendant. One of the most primitive method of speed control is by controlling the voltage supplied to the motor. Kv heeft als eenheid rpm/V(Toerental per minuut/Volt) Kt heeft als eenheid Nm/A(koppel/Ampère) michiel b, 10 mei 2007 #15. michiel b. Lid geworden: 26 aug 2003 Berichten: 3.066 Locatie: Eindhoven, Noord-Brabant. In theory, in order to get RPM value just need to know only 2 factors, there are KV value and battery voltage. Angesichts des personellen Notstandes nehmen die Biancocelesti den Zähler gern mit nach Hause. 26 RPM-sensorset strooischijf passend voor Kverneland KV-RS-XL in Landbouw / Grasland- & voedertechniek / Zoeken op merk en model / Kverneland / Kunstmeststrooier / KV-RS-XL - Kunstmeststrooier / KV-RS-XL Bouwjaar -> 2007 - Kunstmeststrooier Its an rpm rating, but not like an rpm range given with a glow or gas motor. Convert RPM to km/hr easily for any values here. Eines kann ich schon verraten: wir werden eine gemeinsame Unterrichtsstunde verbringen - ihr im Informatikraum in Wien und… Package Included: 1x AEO K3 KV/RPM Meter . For rough conclusion, a low kv motor can produce higher torque with bigger prop and can carry more volts at less currents for your drone, and vice versa. …, Drones or commonly known quadcopters is one of the most spectacular inventions of modern s…, This Drone unfortunately has NOT PASSED our FIVE RATING TEST. Feiern Sie auf K-TV die Heilige Messe live aus verschiedenen Kirchen und Wallfahrtsorten in Deutschland, Österreich und … Simply put, kV is just a measure of the speed with which the motor turns. Vind de fabrikant Kv Rpm van hoge kwaliteit Kv Rpm, leverancier en producten voor de laagste prijzen bij Alibaba.com De waarde van de K v constante, uitgedrukt/gemeten in rpm/Volt, zegt niets over vermogen, stroom, kwaliteit, toerental, koppel, cogging, magnetisme, temperatuur, rendement van de motor.Het geeft alleen aan hoeveel toeren motor onbelast zal draaien bij gegeven spanning: rpm = K v … The Best Lipo Internal Resistance Meter For Drone, How to choose the best lipo battery for quadcopter. To estimate the RPM of a motor, simply multiply the Kv value by the battery voltage. The Kv rating of a brushless motor is the ratio of the motor’s unloaded rpm to the peak voltage on the wires connected to the coils. By now you already know that, whatever you are looking for, you’re sure to find it on AliExpress. If you believe the manufacturer’s numbers.. About 5% of these are DC Motor. RPM= Kv * Voltage . Ever wonder how to convert brushless motor kv to rpm? Check out this video where we explain what is KV in your Brushless Motor. This engine was improved in all areas and is the result of close cooperation between the Hacker R&D department and the hacker Factory Team. Kv is in units of RPM/Volt. The Kv rating of a brushless motor is the ratio of the motor’s unloaded rpm to the peak voltage on the wires connected to the coils. // ]]> In fact, many factors affect the test result, such as battery discharge rating, motor windings, propeller loading and motor efficiency etc. Convert 3 volts to kilovolts: The pulses happen so fast that the motor takes an average voltage. Lower better for bigger, Larger better for smaller. 949 kv rpm products are offered for sale by suppliers on Alibaba.com, of which dc motor accounts for 5%. Three wires are also present on a number of single phase AC motors. Anyone with experience on his matter.Example would be going from 2s to 3s. This represents the average unloaded RPM throughout a full battery discharge. Soooo knowing what electric numbers/terms to compare to a glow motor would be helpful. Der FC Brügge und Lazio Rom trennen sich 1:1. Click the image to purchase it. RC FLYING MAN IN SCALE 1:1 FLIGHT DEMONSTRATION, Click here to login with print subscription account number, https://rotordronemag.com/wp-content/uploads/2018/05/rdronegrey.png, Autel Robotics & DroneSense Create Public Safety UAS. [CDATA[ function battTime(){ a=Number(document.calculator.kvracing.value); b=Number(document.calculator.AvgCurrent.value); d=a*b.toPrecision(3); document.calculator.total.value=d; } As far as I know, KV doesn't determine the voltage a motor can handle, that's usually specified by the manufacturer e.g. Durchfluss Formel Drucken. Knowing the Kv rating of a motor will help you determine how fast that motor will rotate when a given voltage is applied to it. 0 antonymer for kv-diagramm. FPV quadcopter build guide and fpv flying tips, Components of building your own quadcopter, How to choose Best Goggles for FPV Racing, Most popular quadcopter flight controller for FPV Racing, Most popular and best motor for fpv racing, Most popular quadcopter Radio Receiver for FPV Racing, The Hubsan X4 H107C HD Micro Drone with Camera Review, 2 in 1 JJRC H3 Dual Purpose Air Ground RC Quadcopter Drone, 7 Insanely Affordable drone Video editing Techniques, Drone News from around the Globe | Latest Drone News Stories. In ths article will tell you a sample formula, But before that you should know what’s the KV and RPM meaning? Your email address will not be published. Scalar 8-V2 2100 brushless motor. Folge 8 – Umma und Kirche. It’s another concept of motor. An FPV racing quad, for example, requires high rpm for high speed, so you would use a high Kv motor and a small-diameter prop. Wir setzen uns ein, damit Sie die Heilige Messe live mitfeiern können – überall. Finden Sie Hohe Qualität Kv Rpm Hersteller Kv Rpm Lieferanten und Kv Rpm Produkte zum besten Preis auf Alibaba.com If you are not familiar with Ohm’s law, check it out and hopefully it makes sense to you. If torque can be derived from a KV rating then why is a lower KV rating considered more powerful? Englisch korrekt müsste dort doch RPM/V stehen? The reference RPM is the one when 1V was generated. As far as I can see all it does is multiply the Kv rating by the voltage, which hardly seems worth needing a specialist calculator. Brushless elektromotor voor autos Reely kV (rpm/volt): 3650: €48.49. This directly translates in to unloaded RPM for any specific application when the Battery Voltage is known. Das Volt ist die im internationalen Einheitensystem (SI) für die elektrische Spannung verwendete Maßeinheit. A wide variety of kv rpm options are available to you, such as permanent magnet. So, the presence of three wires does not necessarily mean three phase. DCBM which has three wires will have three pairs of coils or three windings whose magnetic fields interact directly with the magnets (as opposed to the AC motor where a voltage is induced into the rotor which then interacts with the AC supply fields). The SI unit symbol is RPM. Welche Bezeichnung ist denn nun korrekt? Profiteer van energie Just enjoy making your quadcopter and then share your diying experiences on here. Submit your video here. Example, if you have 100Hp (horsepower) multiply by 0.746 and get 74.6. A high Kv motor has fewer winds of thicker wire that carry more amps at fewer volts and spin a smaller prop at high revolutions. A wide variety of kv rpm options are available to you, such as permanent magnet. You can’t just add or subtract magnets or windings very easily to adjust speed, so it is done by adjusting voltage (Faraday’s Law). Johnston. Half throttle means that the motor is getting full voltage half the time. So for instance let’s say in three seconds, the flight controller sends 300 pulses to the motor. Das ist jetzt schlampig, aber wie üblich gesagt, weil rpm/V ja eigentlich die Maßeinheit der spezifischen Drehzahl ist, und nicht diese selbst.