A while back reduction gearing methodologies were discussed IIRC, to reduce
turbo charger turbine speed to something manageable to direct drive for
turbo compounding and or an electric motor turbo compounding.

Was there one or more methods recommended that are or may be viable to go
from 90,000 rpm down to 5000, to 10000 rpm range?

Also a side question that is not related to rotary engines so apologies in
advance. Does anyone know how to calculate what the equivalent Hp is for a
turbojet engine developing 27 lbs of thrust?

Thanks.

Cheers,

Brian Feeney
President, CEO
DreamSpace Group


IMHO our traction gear box is the best way to go as super high
spur gear pitch lines velocities are problematic.
http://www.rotaryeng.net/14-traction-drive-exploded-3D.jpg
http://www.rotaryeng.net/17-complete-reduction-less-eng-transp-3D.jpg
http://www.rotaryeng.net/parts1.jpg
http://www.rotaryeng.net/parts3.jpg
http://www.rotaryeng.net/parts5.jpg
http://www.rotaryeng.net/parts6.jpg

Jet engines have thrust that is more or less independent of speed so HP
depends on how fast you are going. For example:
27 pounds of thrust at 400 feet per second is 10,800 pound/feet/second.

Divide that by 550 and you get 19.6 HP.

400 feet per second is 272 MPH. The drag on any reasonable size
air plane would be way more than 27 pounds.

At 200 FPS HP is half that or about 10 HP.

The dilemma is at zero speed HP is also zero in theory :)

What is really happening is all that static trust is just
stirring up the air and heating it in the process.

Paul Lamar