login   |    register
Real Spacecraft
Discuss actual spacecraft either past, present or future (prototypes).
Hosted by David Myres
Build the Enterprise
jimb
_VISITCOMMUNITY
New York, United States
Joined: August 25, 2006
KitMaker: 2,077 posts
ModelGeek: 278 posts
Posted: Friday, May 18, 2012 - 06:47 AM UTC
Ok, this is cool! Impractical, but cool never the less.

Build the Enterprise

Jim
tankmodeler
#417
_VISITCOMMUNITY
Ontario, Canada
Joined: March 01, 2004
KitMaker: 3,029 posts
ModelGeek: 392 posts
Posted: Friday, May 25, 2012 - 02:05 PM UTC
Seriously impractical.

From an engineering point of view, the thing they seem to have forgotten is that a huge rotating gravity wheel (such as proposed within the Primary hull) will also act as a monsterous gyroscope. As the ship orbits the earth all is well, but as soon as you start to increase the orbit (even slowly) as the low thrust ion engines slowly push you out of Earth orbit and up to escape velocity you are also changing the orientation of the gyroscope. It will fight the every step of the way. A great deal of the engine thrust will have to be diverted to constantly react against the torque applied by the gyroscope to the vehicle.

Because of the propulsive efficiency of this concept would be appallingly bad.

This doesn't even begin to address how inefficient the concept is from a structural point of view in the first place.

Paul
jimb
_VISITCOMMUNITY
New York, United States
Joined: August 25, 2006
KitMaker: 2,077 posts
ModelGeek: 278 posts
Posted: Saturday, May 26, 2012 - 02:12 PM UTC
Very true. If you don't have some counter thrust (similar to a tail rotor on a helicopter), the entire ship will just cartwheel through spece. Not a ride I'd want to be on!

While I think the Enterprise is a cool ship, it is science fiction. If they want an interplanetary ship, then the Discovery One from 2001 or the Alexei Leonov from 2010 would be better choices.

Jim
Jessie_C
_VISITCOMMUNITY
British Columbia, Canada
Joined: September 03, 2009
KitMaker: 6,644 posts
ModelGeek: 25 posts
Posted: Saturday, June 16, 2012 - 09:43 AM UTC
You could get around the gyroscopic effect by using two wheels rotating in opposite directions, but to my mind a much more serious problem is the choriolis effect that will be present in a 450m rotating environment. Rotate that sucker at 2 rpm and your head will feel like it's coming off even when you're standing still. That's an awfully tight radius to try and spin up a 1G acceleration.

And this doesn't even being to deal with the reduced G spaces nearer the centre of the saucer. Does that get wasted? Filled with freight? What happens if you slip off the ladder? 225m is a long way to fall...