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active| newest | oldesti also just did a little bit of research and you will get about 650 grams of thrust off of 38000 rpms at 11.1 volts and 30 amps

it depends on the propeller or ducted fan you use and the battery and the esc you need to get at least 500 grams of thrust from the system. if you can find out how many grams of thrust per rpm your propeller gives then you can find how many rpms you need to get at least 500 grams then divide it by the voltage of your battery and then you will have the kv rating of motor you need if you are using brushless and make sure your esc gives off the correct number of amps for the motor. for 500 grams of thrust you will need around 11.1 volts at 35 amps or two 11.1 volt esc's at 18 amps

How is your 25 Volt 15 cm long magnet project progressing ?????//

You could get 25+ volts using 17 C cell 4 Amp batteries in series,

or two 12 Volt 200 Amp car batteries in series

Steve points out the current not voltage makes electromagnets !

Practice here page six.

Understand here.

Now select

Now remember whatever armature you can do.

Professional Guinness competitor will out do you !!

You begin to loose some of the magnetic field to fringing when the layers

stack diameter starts to approach the same dimension as the coil length.

An infinite diameter coil with infinite current in infinite turns is "best".