Captain Ramius: It reminds me of the heady days of Sputnik and Yuri Gagarin when the world trembled at the sound of our rockets. Now they will tremble again - at the sound of our silence. The order is: engage the silent drive.

https://www.youtube.com/watch?v=TmOqbiybfzY

I suspect the viscous drag would be so large so as to make the energy requirement impractical for a small cubesat. For a spinning gyro you only have to replenish the rotational momentum losses plus the very small amount of bearing friction.

Todd

From kd2bd at yahoo.com Tue Feb 7 15:35:48 2017

From: kd2bd at yahoo.com (John Magliacane) Date: Tue, 7 Feb 2017 15:35:48 +0000 (UTC) Subject: [amsat-bb] recomendation brushless controlier References: 1759231051.3921420.1486481748308.ref@mail.yahoo.com Message-ID: 1759231051.3921420.1486481748308@mail.yahoo.com

On Tue, 2/7/17, Nick Pugh <quadpugh at bellsouth.net> wrote:

The sat team is looking recommendations for a brushless motor controller for their momentum wheel. Does the community have any recommendations for a controller?

How about the "Fluid Momentum Wheel" created by AMSAT for one of the P3 birds? (A circular tube of viscous fluid containing magnetic particles that was forced to flow through the tube by pulsing currents through coils wound around the tube. -- Completely solid state. No moving parts.)

73 de John, KD2BD