Timeline for Could ducted propellers improve efficiency in small drones?
Current License: CC BY-SA 4.0
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| Jul 5, 2022 at 7:38 | history | edited | U_flow | CC BY-SA 4.0 |
Added link to discussion if lilium is indeed fraudulant
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| Jul 5, 2022 at 7:23 | comment | added | U_flow | @AndreaF: Unfortunately there is no "easy" way to calculate $\eta$, this is normally done empirically. To make things worse, it also depens how you construct your duct. If you do it wrong, the efficiency might even go down (see this post aviation.stackexchange.com/questions/88170/…) | |
| Jul 5, 2022 at 1:36 | comment | added | Rich | Also, the power/mass ratio of a combustion engine is a big part of the aircrafts mass budget, right? But electric motors are lighter (and outweighed by the batteries) so you could see a motor with lots of reserve power that's just used to take off? | |
| Jul 4, 2022 at 20:50 | comment | added | AndreaF | Thanks for the explaination but remain the problem of the calc of η parameters you have mentioned, Knowing the way to calculate them it would be possible to determine the efficency gain of ducted solution and so know when the gain compensate the added weight and whether the added design complication is worth it | |
| Jul 4, 2022 at 20:13 | history | answered | U_flow | CC BY-SA 4.0 |