Re-entry by active droge-Douglas Eagleson 7-25-16

Using a drag drogue to cause a successful re-entry has an issue. It burns up always.

Here is an alternative. Use a quad propeller as a flat drag plate. The motors are used to control the drag rate matching the required slow re-entry. The only issue is bouncing the capsule out of a proper thermal re-entry profile. The motors are able to drag and also lift. So it is a motor/generator system. Drag can be radiated by heater coils. Lift by powering the propellers.

Bouncing is the meaning of not slowing quickly enough. Altitude to drag function must bee controlled. A variable drag is also analogy to variable lift function.

In general this design should obviate high temperature altitude functions.

Using true propellers for function state control will work in rare atmosphere. Just remember how turbo-vacuum pumps work. It might not be man ratable but for small micro-satellites it just could be the method of choice.

thanks doug

wrote in message
...

Using a drag drogue to cause a successful re-entry has an issue. It burns
up always.

Here is an alternative. Use a quad propeller as a flat drag plate. The
motors are used to control the drag rate matching the required slow
re-entry. The only issue is bouncing the capsule out of a proper thermal
re-entry profile. The motors are able to drag and also lift. So it is a
motor/generator system. Drag can be radiated by heater coils. Lift by
powering the propellers.

Bouncing is the meaning of not slowing quickly enough. Altitude to drag
function must bee controlled. A variable drag is also analogy to variable
lift function.

In general this design should obviate high temperature altitude functions.

Using true propellers for function state control will work in rare
atmosphere. Just remember how turbo-vacuum pumps work. It might not be
man ratable but for small micro-satellites it just could be the method of
choice.

thanks doug

Google https://en.wikipedia.org/wiki/Rotary_Rocket


--
Greg D. Moore http://greenmountainsoftware.wordpress.com/
CEO QuiCR: Quick, Crowdsourced Responses. http://www.quicr.net

On Tuesday, July 26, 2016 at 5:47:18

thanks doug

Google https://en.wikipedia.org/wiki/Rotary_Rocket


--
Greg D. Moore http://greenmountainsoftware.wordpress.com/
CEO QuiCR: Quick, Crowdsourced Responses. http://www.quicr.net

thanks for the reference.

I am specifying a quadpropeller version to allow spin suppression from torque. The horizontal helicopeter propeller is there for exactly this reason. In re-entry the air is to thin. Orbit inversion of your reference design is viable.

thanks doug