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Feedback #27521

extendable ladders have surprisingly high drag

Added by [email protected] 25 days ago.

Status:
New
Severity:
Low
Assignee:
-
Category:
Aerodynamics
Target version:
-
Version:
Platform:
Windows
Expansion:
Core Game
Language:
English (US)
Mod Related:
No
Votes:
Arrow u r green
Arrow d r red

Description

The extendable ladder has an automatically generated drag-cube corresponding to its container, which is clipped inside the craft by default. The shape of the (usually hidden) box and KSPs rules for drag of surface mounted parts means that the ladder contributes more drag to a rocket than a 1-man pod.
Reported here: https://forum.kerbalspaceprogram.com/index.php?/topic/201186-rate-stock-ladders-on-the-drag-index/&do=findComment&comment=3952683

The ladders' configuration files could specify dimensions so only the usually-exposed part of the container contributes to drag:

@PART[telescopicLadder] {
    %DRAG_CUBE{// back of box     face with door  top             bottom          side            side
    cube = A, 0.13,0.70,0.58, 0.13,0.85,0.17, 0.05,0.70,0.25, 0.05,0.70,0.14, 0.11,0.84,0.19, 0.11,0.84,0.19, 0.149,-0.015,-0.007, 0.57,0.22,0.63
    cube = B, 0.33,0.79,0.70, 0.33,0.94,0.41, 0.10,0.80,0.54, 0.10,0.80,1.52, 0.20,0.81,0.42, 0.20,0.81,0.44, 0.109,-0.672,-0.007, 0.65,1.56,0.63
}}// door is 63cm wide, so if it sticks out 8cm that's about 50cm² area as seen from the top, and rounded so Cd about 0.7
@PART[telescopicLadderBay] {
    %DRAG_CUBE{// back of box     face with door  top             bottom          side            side
    cube = A, 0.10,0.67,1.03, 0.10,0.84,0.16, 0.04,0.70,0.22, 0.04,0.70,0.22, 0.19,0.86,0.34, 0.19,0.86,0.33, 0.369, 0.091,0.004, 1.00,0.23,0.51
    cube = B, 0.42,0.80,1.13, 0.42,0.90,0.27, 0.10,0.80,0.65, 0.10,0.80,2.90, 0.30,0.84,0.35, 0.30,0.83,0.35, 0.342,-1.177,0.004, 1.05,3.04,0.51
}}// door is 51cm wide, so if it sticks out 8cm that's about 40cm² area

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