Adding motor drive to generate downward thrust

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zhanghaijason
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Adding motor drive to generate downward thrust

Post by zhanghaijason » Sun Nov 11, 2018 8:07 pm

Hello,
I am wondering if downward thrust can be generated if I add motor drives to control the four motors. Thanks

tobias
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Re: Adding motor drive to generate downward thrust

Post by tobias » Mon Nov 12, 2018 12:32 pm

It depends on what you mean. There are two possible solutions.
1. Reverse the direction of drive of the propeller. This requires a H-bridge driver which the Crazyflie does not have. Would be possible to build on a expansion deck though.
2. Using variable pitch propellers (as on helicopters). I have not seen any design that is small enough for the Crazyflie. It would also require new drive since both the propeller speed and pitch needs to be controlled.

zhanghaijason
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Joined: Fri Jul 28, 2017 9:07 pm

Re: Adding motor drive to generate downward thrust

Post by zhanghaijason » Mon Nov 12, 2018 8:47 pm

tobias wrote:
Mon Nov 12, 2018 12:32 pm
It depends on what you mean. There are two possible solutions.
1. Reverse the direction of drive of the propeller. This requires a H-bridge driver which the Crazyflie does not have. Would be possible to build on a expansion deck though.
2. Using variable pitch propellers (as on helicopters). I have not seen any design that is small enough for the Crazyflie. It would also require new drive since both the propeller speed and pitch needs to be controlled.

I guess H-bridge would be the solution since most of the time, upward thrust is used for normal flight and downward thrust is needed not very often.

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