The duct sizes we usually make are 30mm, 50mm, 64mm, 70mm, 80mm, and 90mm, and the duct should be selected according to the ready-to-flight weight of the jets. The thrust marked in the datasheet of the product is the maximum thrust in the ideal state, so the calculation is based on 70% of the thrust when selecting.
What is ready-to-flight weight?
That is, the weight of all aircraft except the remote control includes the jet shell, ESC, duct, etc. for the details please check RC Airplanes Victor who makes it very clear.
Various size duct options
| Size of Duct | Thrust | Ready-to-flight weight |
| 30mm | 200g | 100 – 150g |
| 50mm | 750g | 375 – 525g |
| 64mm | 1870g | 935 – 1600g |
| 70mm | 2700g | 1350 – 2400g |
| 90mm | 4500g | 2250 – 4000g |
I only chose one value of our duct products as a reference. We have different motors for each size of the duct, so the parameters are not the same.
Electric Ducted Fan was configured in our company, we can recommend a suitable one for you based on the ready-to-flight weight.
