20A Little Bee FVT Spring 4-in-1 BLHeli ESC with 1A 5V & 2A 12V BECs - 36mm x 36mm
|List price||Price||You save|
We ship worldwide - Same day shipping on all orders placed before 4pm - FREE delivery on UK orders over £99 <1kg*
This is the brand new Little Bee Spring 4-in-1 ESC, now with D-Shot supported and available in 20A and 30A versions. It's been designed with quad racers in mind. The ESC measures 36mmx36mm so it's stackable with popular racing drone flight controllers, making for a super neat build. It also features a 1A BEC, which can be used to power your FC and a 12V 2A BEC which can be used to power things like FPV cameras and LEDs. Like Little Bee's other D-Shot ESCs, the 4-in-1 features the new EFM8BB21F16F processor for smoother operation and improved compatibility with high KV motors.
What you need to know about ESCs: ESCs or Electronic Speed Controllers act as the messenger between your flight controller and motors. They provide a pulsating signal to the motors to drive a change in RPM and thus a resulting multicopter movement. A good ESC is paramount to stable flying. As brushless motors are multi-phased, normally 3 phases, you can't just apply DC power to turn them on. An ESC is basically a motor controller board that has a battery/signal input and a three phase output for the motor. Each ESC is controlled independently by a PPM signal that ranges from 1ms (min speed=turn off) to 2ms (max speed) in pulse width. The frequency of the signals varies between manufacturers, but for a multirotor it is recommended to use an ESC that supports a high refresh rate. A fast ESC will enable the motors to adjust quickly improving throttle response, drastically increasing stability and providing a more locked in feeling. Some ESC support programming, meaning you can reflash them with custom firmware. For instance, multirotor firmware such as SimonK is highly recommended by many for the best flight performance. However, caution should be applied as it is possible to ruin an ESC when attempting this process, therefore only a competent person with the correct equipment should attempt to reflesh an ESC. If you're after a good tutorial on how to flash your ESCs I recommend reading this.
When choosing an ESC you should match its ampere and voltage rating to your motors and LiPo. Current rating is usually given as 2 figures; a value which represents the maximum continuous current load and a higher burst figure which corresponds to a short term current (allowed normally for no more than 10-30 seconds) e.g. that produced at take off. It's recommend to select a speed controller allowing for a 20% safety margin. The other main ESC rating is the maximum voltage. This is usually expressed as the number of cells, e.g. a 6S LiPo (22.2v).
A lot of ESCs incorporate a BEC (Battery Elimination Circuit). This is a handy feature as it means that (within certain conditions) you do not need a separate receiver battery. They work by stepping down the main battery voltage to usually 5V. However, this process is inefficient and creates heat; the greater the differential between battery voltage and 5V the more heat generated. Consequently BECs (unless of the switching type) only work with a specified number of cells, often only up to a 3S LiPo and also within a specified current load. If not being used, the ESC’s BEC should be disabled by removing the middle (positive) wire to the receiver. For the reasons stated above, most large capacity ESCs do not have a BEC, but instead are almost always of the OPTO type (opto-coupled). OPTO ESCs differ from regular ESCs as the throttle signal between the motor and receiver circuits within the ESC are coupled via a light beam, not by a direct electrical connection. This is supposed to reduce radio interference between the motor and receiver. As a result, OPTO ESC require 5V to power the input side of the optocoupler, this is usually provided from the receiver, which in turn is powered by a separate battery or SBEC.
ESCs have three sets of wiring. On one side two wires, one black and one red that go to the battery or power distribution board. Also on the same side, you would normally have a 3 pin servo/receiver cable that usually plugs into a motor output on your flight controller. Finally the other side commonly has 3 outputs, which connect to the motor cables. If your motor is spinning in the wrong direction, simply swap the positions of two of these wires.
You should also give careful thought to the position of your ESCs within your craft. They are concentrated sources of magnetic interference, so locate them away from flight electronics such as the compass. Make sure they are ventilated, as they are likely to fail if they overheat. Some people recommend placing them out on the frame booms below the motors so that they are cooled by the prop wash; others caution against this approach as they are more vulnerable to damage and longer wires increase the risk of damaging voltage spikes.
Finally, some ESCs come pre-calibrated, however it's advisable to calibrate all ESCs before use by following the manufactures instructions.
All information relating to shipping and delivery is stated here. Should you not find what you are looking for, please contact us.
Shipping costs are calculated once items have been placed in your basket during checkout.
UK Postage: Here at Flying Tech we process orders Monday to Friday and pride ourselves on our quick turnaround of orders. If stocks levels allow, we aim to dispatch orders placed before 4PM the same day with Royal Mail. Our cut off time for courier delivery is earlier; orders must be placed by 2PM for next day delivery with DHL and 1PM for next day delivery with APC. A confirmation email will be sent when your order has been dispatched. If you wish to change your order, please contact us promptly, as we won't be able to make amendments once the order has been shipped.
We are partnered with several delivery companies including Royal Mail, DHL, APC and Parcel Force. If you have a special delivery requirement or would like to arrange a shop collection please contact us. For small low value orders our cheapest delivery service is Royal Mail First Class; this service aims to deliver the next working day including Saturdays and it can be sent recorded for extra peace of mind – please note this is not a guaranteed next day delivery or trackable service.
For a guaranteed next day delivery we recommend Royal Mail Special Delivery or one of our courier delivery options. Royal Mail Special Delivery will arrive by 1PM the next day and for an extra fee can be delivered on Saturdays. APC Overnight offers next day delivery with full tracking and a 2hr time slot pre-delivery text notification. DHL is a good option for larger consignments and remote locations such as Northern Ireland and Isle of Man. All high value orders are fully insured and will likely require a signature on delivery.
FREE shipping in the UK on orders over £99 (this is a signed for service and insured to a maximum of £40). Please note that the offer only applies to orders with a total weight under 1Kg and that a few products are exempt from the offer.
International Postage: We are based in the UK, but ship to most worldwide destinations. Postage rates are calculated by the weight and shipment location, the price is quoted during the checkout. Low value order can be sent by Air Mail, but are not insured. Higher value, heavy goods will be sent with DHL or an alternative courier. Orders shipped outside the EU may be subject to customs charges. These charges are additional to any delivery costs and will need to be paid by the recipient.
For our international customers who require a rapid delivery we off a DHL Express service. DHL Express offers NEXT DAY delivery to most European destinations and a very fast delivery for countries further afield, generally 2-3 days. For country specific estimated transit times, please refer this download.
We reserve the right to modify, remove or add to any of these services at any time. We endeavour to ship all items as fast as possible. If you would like an alternative shipping arrangement to be made please contact us.