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--- drawingboard:components:propulsion:air [2024/06/05 15:53] – tailkinker
+++ drawingboard:components:propulsion:air [2024/06/06 11:25] (current) – [Jet Engines] tailkinker
@@ Line 43: / Line 43: @@
 \[dg]Fuel is not needed for the fusion turbofan, but burning reaction mass allows it to exceed its service ceiling
-Volume for all engines listed above, in cubic meters, is equal to their mass divided by 75.
+Fuel is in liters per hour.  Volume for all engines listed above, in cubic meters, is equal to their mass divided by 75.
 ==== Afterburner ====
@@ Line 66: / Line 66: @@
 |  +2  |Fusion Turbofan    |  28,000m          |
-=== Fusion Rockets ===
+=== Fusion Turbofans and Fuel ===
 A fusion turbofan burns no fuel when below 28,000 meters, where there's sufficient air to use as reaction mass.  However, you can carry reaction mass for it, and just toss it into the heating chamber.  This will allow your fusion turbofan to exceed its service ceiling and travel into space, effectively becoming a fusion //rocket//.  When used in this mode, a fusion turbofan will burn water as though it were fuel, at a rate equal to its Thrust divided by 600.
+===== Space Drives =====
+If your vehicle is a spacecraft that is capable of operating in atmosphere, you may want to use your space drive as though it were an aircraft engine.  This is allowed, for certain types:  chemical fuel rockets, metal oxide rockets, fission and fusion rockets, and antimatter thermal rockets.
+In such cases, you'll need to find your vehicle's maximum speed in atmosphere.  To find this, divide your Thrust by your Drag, and multiply by 7,000.  Then take the square root of the result.  Drop fractions, just to make your life easier.