Parts & Vessels Airbrake Drag Cube is Treated as a Freestanding Part Regardless of Condition (Deployed/Undeployed)

[hidearimjosh]

Reported Version: v0.1.4.1 (latest) | Mods: micro engineer | Can replicate without mods? Yes 
OS: Windows 10 Home edition (Build 19045.3324) | CPU: Intel i7-9700 | GPU: NVIDIA GeForce GTX 1660 Ti | RAM: 16 GB 2666 Hz

 

The drag created by airbrakes does not change when deployed or undeployed. This issues causes large sums of drag to be caused by airbrakes while the airbrakes are at any angle other than 0 relative to the oncoming wind regardless of being deployed or not.

A workspace file has been included with the 2 planes used for testing.

Expected result: Drag created by a surface mounted, undeployed, airbrake should not increase as the craft pitches up as the airbrake is out of the airstream and flat against the body.
Current result: The game applies drag to the airbrakes on their AoA alone while disregarding their relative position to the fuselage of the plane

Expected result: Left
Current result: Right

Spoiler

Testing to prove the theory. All testing was done by letting the plane achieve the highest speed it can in any given state, making sure it was stable, and then taking a screenshot.

Plane WITHOUT airbrakes (405 m/s)

Spoiler

Plane with airbrakes on the side (undeployed (361m/s) and deployed (187m/s))

Spoiler

Plane with airbrakes placed at a 90 degree angle by default (undeployed (188 m/s) and deployed (376 m/s))

Spoiler

 

 

Included Attachments:

AirbrakeDragBugreport.json

Edited October 10, 2023 by Anth12

[Baleygr]

Reported Version: v0.1.5 (latest) | Mods: none | Can replicate without mods? Yes 
OS: Win10 | CPU: 5600X | GPU: 3700 | RAM: 64GB

 

Severity: Med/Low

Frequency: High/100%

Description:  
Steps

• Use Craft `Airbrake AoA Test` from attached Workspace.
• Set angle of attach for existing Airbrakes as needed (for top mounted, use two compensating the mass)
• Launch Craft
• At MECO (end of runwayish), stage for braking parachutes
• Recover vessel
• Observe  max speed
• Rinse Pilot and Repeat

Actual

• top mounted airbrakes are far slower (263 m/s) than side mounted ones (311m(s)
• there is a non linear relationship between angle of attach and final speed

Expected

• Same final speed on all mounting points/angle of attach
• Same drag for 

Notes

First I assumed a trigonometric behaviour (see diagram), still might be but could be overshadowed by approaching Mach1
The second Craft in the Workspace is stuck below Mach1 with a top mounted Airbrake, and reaches LKO with 1k dV with side mounted ones
Behaviour is not observed for other parts (tested about 10 others, gears, fins, wings, tanks (empty), pilot seat)
Behaviour is not observed for deployed airbreakes (!)

 

 

Included Attachments:

Airbrakes_braking.mp4

NewWorkspace.json

Edited October 28, 2023 by The Space Peacock

[The Space Peacock]

@hidearimjosh moved your report out of the archive

@Baleygr merged your report with this one