Differences

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--- drawingboard:fundamentals:hull_shape [2024/05/31 13:24] – [Streamlining] tailkinker
+++ drawingboard:fundamentals:hull_shape [2024/06/06 01:34] (current) – [Wings] tailkinker
@@ Line 2: / Line 2: @@
 The shape of the vehicle will impact a lot of variables in the future.  Right away, it will have a significant effect on your Area value.
+===== Legs =====
+If your vehicle is a walker of some sort, it will need legs.  You can install as many legs as you want, but there's a big price to be paid for that.
+Half of your vehicle's volume will be given over to its legs.  Divide your volume by two, go back to the [[drawingboard:fundamentals:scale|Volume table]], and look up the new Area and Linear values.  That's for the part of your vehicle that //isn't// legs.
+Then take that volume, and divide it among the number of legs your walker has.  This should be done evenly, as you're going to install the walker drivetrain evenly.  Go to the Volume table, and look up the Area and Linear values for your leg.
+Total the Area volumes for both the body and the legs.
+<WRAP 80% box round center>
+Intending to build a 40-tonne medium walker, Gary starts with a Volume of 120.  Half of this becomes his walker's body, giving him an Area of 16 and a Linear of 4.  He decides to give his walker four legs, and divides 60 by 4, getting a Volume of 16 for each leg.  That's an Area of 6.76 and a Linear of 2.6 for each leg.  6.76 × 4 = 27.04, + 16 = 43.04 square meters total, a lot more than the 25 square meters he would have needed for a tank!
+</WRAP>
 ===== Multiple Hulls =====
@@ Line 27: / Line 41: @@
 **Excellent** Streamlining is normally only found on missiles, rockets or the fastest of airplanes.
-^Streamlining  ^  Factor  ^
+^Streamlining  ^  Factor  ^  Cost  ^
-|None          |    ×1   |
+|None          |    ×1    |   ×1   |
-|Mild          |  ×1.07  |
+|Mild          |  ×1.07   |   ×1   |
-|Moderate      |  ×1.13  |
+|Moderate      |  ×1.13   |  ×1.3  |
-|Good          |  ×1.2   |
+|Good          |  ×1.2    |  ×1.7  |
-|Excellent     |  ×1.25  |
+|Excellent     |  ×1.25   |   ×4   |
+===== Wings =====
+A certain amount of wing is needed just to get in the air!  Multiply your vehicle's mass, in tonnes, by 3.6, then multiply by the Streamlining Factor from above.  That's the Minimum Wing Area you need to install.  Your main body provides a small amount of lift;  subtract one-tenth your main body's Area from the minimum Wing Area.
+Then just add that Minimum Wing Area into your vehicle's total Area.  You can, if you wish, add more wing area.  It will affect certain fiddly details such as your stall speed, aerial handling and runway takeoff distance.
+==== Wing In Ground Effect ====
+If the wing is intended only to operate within the ground effect, you can halve the Minimum Wing Area.  However, your aircraft cannot fly higher than your vehicle's Linear value, expressed in meters.