8x4.5 Carbon Fibre Propeller Set CW/CCW (DJI Style)
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These are specially designed to fit the DJI Motors with 8mm prop shaft, such as the DJI 2212/920KV.
Selecting the correct propeller: Choosing the correct prop/motor combination can be challenging. There is a lot of math and science to appreciate how your propellers affect your drone’s flight performance. As a novice, it is very easy to be overwhelmed by all of it, but propeller choice is a very important decision so it’s worth the effort; propellers affect the agility, stability and efficiency of your craft. The correct motor/prop combination needs to be chosen by considering the size and weight of the multirotor, the length of flying time and the power and agility that are desired.
A multirotor uses clockwise(CW) and counter-clockwise(CCW) propellers to counteract the torque effect of the props. Prop types are also differentiated as “tractor” (counterclockwise) and “pusher” (clockwise).
Propellers are classified by diameter and pitch. The diameter is the measured length of the propeller, the pitch is how far the propeller will theoretically advanced in one revolution. For example, a 12×4.7 propeller has 12 inch diameter and will travel 4.7 inches in one revolution.
The diameter of a propeller dictates how much thrust can be generated. Propeller efficiency is related to the area of a prop so a small increase in prop diameter will make the multirotor greatly more efficient. Since drones are generally hovering, a low pitch is recommended. If you want to go somewhere fast a higher pitch might be appropriate. Maneuverability and stability of a multicopter is dependent on how quickly you can change the RPM of the props. A smaller / lighter prop is easier to speed up and slow down whereas a large prop takes longer to change speeds. This is one reason why 3 bladed props are generally not appropriate for multirotor use.
In summary, an efficient UAV will have properly sized, low RPM motors with very large props, where as an acrobatic UAV will want smaller, more aggressive props, and faster motors. As a general rule you want a 2:1 thrust/weight ratio for a standard multi rotor and 3:1 or higher for something acrobatic.
Material selection is another important consideration. Carbon fiber props are generally preferable. They are very lightweight. This makes for a longer flight time and more importantly a more stable platform as lighter props allow motor RPM to change rapidly. Carbon props also have great stiffness, which maintains even lift under rpm changes resulting in higher efficiency. Unfortunately there is a down side to stiff props, all the vibration is transferred to the motor and frame, increasing wear on bearings and adding vibration to the footage. Balanced props can drastically vibrations. It is advisable not to use carbon fiber props for initial tuning as they shatter on impact and are typically expensive. If you aren’t so concerned about weight, wooden props are excellent for vibration damping. However, their added mass means they take longer to change speed and draw more current/power when the flight controller tries to increase RPM which reduces flight time and stability.
If you are still confused, do some research; see what other experienced pilots are flying with - that way you can find a proven solution for free. You could also do some experimentation, use ecalc - an online multicopter calculator to help you find the best component combinations, or if you have the budget, buy a range of sizes to find the optimal prop.
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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 1PM 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, such as LiPo batteries.
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.