How to interpret efficiency cruves of climb and cruise propellers? |
| How to interpret efficiency cruves of climb and cruise propellers? Posted: 10 May 2021 05:56 AM PDT As far as my understanding goes, in an aircraft, during take-off the rotational speed of the propeller would be large in order to generate enough thrust to take off. And during cruise, the rotational speed is lowered since the needed thrust is less. But the efficiency curves of climb (green curve) and cruise (blue curve) propellers tell me otherwise. See figure 6 of this paper https://commons.erau.edu/cgi/viewcontent.cgi?article=1840&context=publication The climb propeller, which is meant to work at high propeller rotational speeds, has low efficiency at these high propeller rotational speeds. The same goes for the cruise propeller which has low efficiency at low rotational speeds. I have searched online, and everyone just takes these curves as they are but I genuinely don't understand the efficiency vs rpm curve. Shouldn't the curves be switches? The climb propeller has high efficiency at large speeds while the cruise propeller has high efficiency at low speeds? Thanks in advance. [link] [comments]  |
| How does mass and velocity affect the stopping distance? Posted: 08 May 2021 09:24 AM PDT We all know that doubling velocity will quadruple the stopping distance. What is the reason behind this? And how would mass affect the stopping distance? [link] [comments]  |
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