OK, let's say I receive a propeller of 1.2m in diameter near 3 brades to be driven by a electric motor DC 12V How powerful does the dc motor need to be to drive a such propeller at 65knots?
As you can see I am not too exact about aircraft spec. If you inevitability more information I will be happy to provide.
By the opening that is my first time contained by this forum.
Answers: First of all, I doubt a 12V DC motor will know how to spin a 1.2 meter propeller at all. My r/c truck have a 19.2V motor and I know it cannot spin a propeller of that size at any considerable speed. Second of all, the amount of power required depends on the pitch and shape of the propeller blades as capably as the diameter of the propeller.
A 1.2 meter diameter propeller may be capable of absorbing considerable horsepower, and an electric motor is probably not an appropriate power source.
The design of propellers is a pretty complex subject, and in attendance is more involved than it would be practical to cover in this space. I suggest an internet hunt on "propeller design."
The speed that a propeller can yield depends on the power obsessed by the airframe to which it is attached, in expressions of what is called "frontal nouns," which is a mathematical abstraction of the drag produced by an aircraft body.
Another factor is the pitch of the propeller.
Electric motors are not really practical for aircraft at this point, because the power source have not yet be developed. Batteries are too heavy for aircraft use.
So some dutiful solid library time is your best approach. Good luck.
Propeller and engine mating is a black art that's best not meddle with by mere mortals...
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