Talk:3152: Skateboard - Revision history

R128 at 18:22, 6 February 2026

2026-02-06T18:22:49Z

82.132.245.237 at 15:38, 12 November 2025

2025-11-12T15:38:30Z

2.50.0.22 at 05:23, 12 November 2025

2025-11-12T05:23:28Z

Kurahaupo: skateboard engineering

2025-10-16T06:07:54Z

skateboard engineering

82.13.184.33 at 13:25, 10 October 2025

2025-10-10T13:25:14Z

82.13.184.33 at 13:24, 10 October 2025

2025-10-10T13:24:37Z

205.118.120.162 at 17:51, 9 October 2025

2025-10-09T17:51:47Z

82.13.184.33 at 15:35, 9 October 2025

2025-10-09T15:35:20Z

RadiantRainwing at 15:32, 9 October 2025

2025-10-09T15:32:58Z

Fephisto at 15:10, 9 October 2025

2025-10-09T15:10:27Z

@@ Line 21: / Line 21: @@
 "the difference between the 300 ft and 600 ft ramps could be the difference between tragedy and skating immortality"
 Whoever wrote this deserves an award. [[User:Fephisto|Fephisto]] ([[User talk:Fephisto|talk]]) 15:10, 9 October 2025 (UTC)
 === Engineering ===

@@ Line 6: / Line 6: @@
 : Parachute packs are secured with shoulder AND leg straps, so it's indeed very difficult to mistake them for ordinary backpacks. [[Special:Contributions/194.119.24.136|194.119.24.136]] 08:39, 9 October 2025 (UTC)
 :Oh my gosh, how did I not notice that!? I am OBSESSED with THSC. [[User:RadiantRainwing|RadiantRainwing]] ([[User talk:RadiantRainwing|talk]]) 15:32, 9 October 2025 (UTC)
-me when i realize that all my fandoms are dead (thsc, xkcd, alan becker.)
+me when i realize that all my fandoms are dead (thsc, xkcd, alan becker.) {{unsigned ip|2.50.0.22|05:23, 12 November 2025}}
 Wait, so "gee forces" isn't some kind of weird obscure pun? - [[Special:Contributions/24.177.125.170|24.177.125.170]] 08:51, 9 October 2025 (UTC)

@@ Line 6: / Line 6: @@
 : Parachute packs are secured with shoulder AND leg straps, so it's indeed very difficult to mistake them for ordinary backpacks. [[Special:Contributions/194.119.24.136|194.119.24.136]] 08:39, 9 October 2025 (UTC)
 :Oh my gosh, how did I not notice that!? I am OBSESSED with THSC. [[User:RadiantRainwing|RadiantRainwing]] ([[User talk:RadiantRainwing|talk]]) 15:32, 9 October 2025 (UTC)
 Wait, so "gee forces" isn't some kind of weird obscure pun? - [[Special:Contributions/24.177.125.170|24.177.125.170]] 08:51, 9 October 2025 (UTC)

← Older revision		Revision as of 06:07, 16 October 2025
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	"the difference between the 300 ft and 600 ft ramps could be the difference between tragedy and skating immortality"		"the difference between the 300 ft and 600 ft ramps could be the difference between tragedy and skating immortality"
	Whoever wrote this deserves an award. [[User:Fephisto\|Fephisto]] ([[User talk:Fephisto\|talk]]) 15:10, 9 October 2025 (UTC)		Whoever wrote this deserves an award. [[User:Fephisto\|Fephisto]] ([[User talk:Fephisto\|talk]]) 15:10, 9 October 2025 (UTC)
		+
		+	=== Engineering ===
		+	==== Skateboard ====
		+	Assuming a landing speed of about 55 m/s (terminal velocity for a human falling in a spread-eagle position), and 52 mm diameter wheels, the wheels would spin at about 20000 rpm. Whilst that's well within the range for high quality wheels, the rotational acceleration on the wheels would be stressful; [[Cueball]] would need to land closer to upright to account for this initial resistance.
		+	[[User:Kurahaupo\|Kurahaupo]] ([[User talk:Kurahaupo\|talk]]) 06:07, 16 October 2025 (UTC)

@@ Line 16: / Line 16: @@
 Terminal velocity in a flat orientation is something like 200 km/hr, or 55 m/s.  The 600 ft halfpipe presumably describes the radius, so that's 180 m.  Then, acceleration in a circular path is a = v^2/r, so making that turn would be 55^2 / 180 = 17 m/s^2.  With 1 g = 10 m/s^2, that's under 2 g.  A 300 ft, or 90 m ramp, would be about 3.5 g.  Add 1 g when you're at the bottom of the ramp and your rotational acceleration is aligned with gravity, so 4.5 g on a 300 ft ramp.  That is indeed at the 4-5 g's where sustained exposure will cause blackout.  Note, it will take about 17 s to travel around a 90 m ramp.  If Cueball can manage to land lying flat on the board, humans are much more tolerant of transverse g forces, up to 11 g's for 3 minutes, per https://www.goflightmedicine.com/post/pulling-gs-the-effects-of-g-forces-on-the-human-body  But that would also probably prevent doing tricks.[[Special:Contributions/163.116.146.119|163.116.146.119]] 14:27, 9 October 2025 (UTC)
-I think it's a reference to the new skate. game that's in early access because you commonly do insane stuff off building or while skydiving in the game. [[User:DetmerL]] ([[User talk:DetmerL]]) 14:37, 9 October 2025 (UTC)
+I think it's a reference to the new skate. game that's in early access because you commonly do insane stuff off building or while skydiving in the game. [[User:DetmerL|DetmerL]] ([[User talk:DetmerL|talk]]) 14:37, 9 October 2025 (UTC)
 "the difference between the 300 ft and 600 ft ramps could be the difference between tragedy and skating immortality"
 Whoever wrote this deserves an award. [[User:Fephisto|Fephisto]] ([[User talk:Fephisto|talk]]) 15:10, 9 October 2025 (UTC)

← Older revision		Revision as of 15:32, 9 October 2025
Line 4:		Line 4:

	Perhaps the “wrong parachute pack” thing is just a common trope, but I was immediately reminded of the example in the Henry Stickmin Collection, where Henry survives the initial fall without a parachute just fine, but is immediately killed by the contents of the backpack falling out and onto his head. [[User:KelOfTheStars!\|KelOfTheStars!]] ([[User talk:KelOfTheStars!\|talk]]) 01:55, 9 October 2025 (UTC)		Perhaps the “wrong parachute pack” thing is just a common trope, but I was immediately reminded of the example in the Henry Stickmin Collection, where Henry survives the initial fall without a parachute just fine, but is immediately killed by the contents of the backpack falling out and onto his head. [[User:KelOfTheStars!\|KelOfTheStars!]] ([[User talk:KelOfTheStars!\|talk]]) 01:55, 9 October 2025 (UTC)
		+	:Oh my gosh, how did I not notice that!? I am OBSESSED with THSC. [[User:RadiantRainwing\|RadiantRainwing]] ([[User talk:RadiantRainwing\|talk]]) 15:32, 9 October 2025 (UTC)
		+
	: Parachute packs are secured with shoulder AND leg straps, so it's indeed very difficult to mistake them for ordinary backpacks. [[Special:Contributions/194.119.24.136\|194.119.24.136]] 08:39, 9 October 2025 (UTC)		: Parachute packs are secured with shoulder AND leg straps, so it's indeed very difficult to mistake them for ordinary backpacks. [[Special:Contributions/194.119.24.136\|194.119.24.136]] 08:39, 9 October 2025 (UTC)

← Older revision		Revision as of 15:10, 9 October 2025
Line 16:		Line 16:

	Terminal velocity in a flat orientation is something like 200 km/hr, or 55 m/s. The 600 ft halfpipe presumably describes the radius, so that's 180 m. Then, acceleration in a circular path is a = v^2/r, so making that turn would be 55^2 / 180 = 17 m/s^2. With 1 g = 10 m/s^2, that's under 2 g. A 300 ft, or 90 m ramp, would be about 3.5 g. Add 1 g when you're at the bottom of the ramp and your rotational acceleration is aligned with gravity, so 4.5 g on a 300 ft ramp. That is indeed at the 4-5 g's where sustained exposure will cause blackout. Note, it will take about 17 s to travel around a 90 m ramp. If Cueball can manage to land lying flat on the board, humans are much more tolerant of transverse g forces, up to 11 g's for 3 minutes, per https://www.goflightmedicine.com/post/pulling-gs-the-effects-of-g-forces-on-the-human-body But that would also probably prevent doing tricks.[[Special:Contributions/163.116.146.119\|163.116.146.119]] 14:27, 9 October 2025 (UTC)		Terminal velocity in a flat orientation is something like 200 km/hr, or 55 m/s. The 600 ft halfpipe presumably describes the radius, so that's 180 m. Then, acceleration in a circular path is a = v^2/r, so making that turn would be 55^2 / 180 = 17 m/s^2. With 1 g = 10 m/s^2, that's under 2 g. A 300 ft, or 90 m ramp, would be about 3.5 g. Add 1 g when you're at the bottom of the ramp and your rotational acceleration is aligned with gravity, so 4.5 g on a 300 ft ramp. That is indeed at the 4-5 g's where sustained exposure will cause blackout. Note, it will take about 17 s to travel around a 90 m ramp. If Cueball can manage to land lying flat on the board, humans are much more tolerant of transverse g forces, up to 11 g's for 3 minutes, per https://www.goflightmedicine.com/post/pulling-gs-the-effects-of-g-forces-on-the-human-body But that would also probably prevent doing tricks.[[Special:Contributions/163.116.146.119\|163.116.146.119]] 14:27, 9 October 2025 (UTC)
		+
		+	"the difference between the 300 ft and 600 ft ramps could be the difference between tragedy and skating immortality"
		+	Whoever wrote this deserves an award. [[User:Fephisto\|Fephisto]] ([[User talk:Fephisto\|talk]]) 15:10, 9 October 2025 (UTC)