75 degree slope bricks, format 2x2x3

[legotrainfan]

Are 75 degree slope bricks, format 2x2x3, no longer in production? Haunted House comes with similar elements, but they are 73 degree versions. Were the 75 degree bricks not good enough?

[Lyichir]

Are 75 degree slope bricks, format 2x2x3, no longer in production? Haunted House comes with similar elements, but they are 73 degree versions. Were the 75 degree bricks not good enough?

As far as I can tell, the 2x2x3 slopes in the Haunted House and later sets are essentially the same as the ones in any older sets, save for having solid studs instead of hollow studs. I don't have the Haunted House open, but I do have Gorzan's Gorilla Striker, which has the same newer mold according to both Bricklink and Brickset, and comparing it to the older version I'm not seeing any difference in angle whatsoever.

Edited May 22, 2014 by Lyichir

[antp]

I do not think there is a difference

Lego calls them Roof Tile 73°

Bricklink calls then Slope 75

but they're the same part.

[weavil]

It should be. I got some old ones from the 90's and some new ones from last year. They look and feel exactly the same. Haven't measured the angle yet though.

[legotrainfan]

I haven't got any new slope bricks of that type. I just checked the brick inventory of Haunted House and I was surprised that a different angle was indicated. But according to what you have sad, there is no difference between the new slope brick and the old one. It is quite confusing that different websites indicate different angles, though.

[62Bricks]

I believe Bricklink inherited the 75-degree name from LDraw. (It's even more confusing when you discover that the LDraw files for these slopes draw the slope at about 74 degrees.)

The difference in the designation probably comes from an oversight when the first LEGO fans described the part for LDraw. The 73-degree slope brick is three bricks high, and the sloped part is one brick wide. A LEGO brick is 0.8 times wide as it is high. So if you imagine a right triangle that is 3 units high by 0.8 units wide, you can determine the angles using trigonometry. Such a triangle would have angles of 90, 15 and 75 degrees. (90, 14.94 and 75.06, actually).

But most LEGO slopes, including the 73-degree slopes, do not slope continuously to the bottom edge of the piece. There is a lip around the bottom edge to allow space for studs to connect underneath. This lip is slightly higher than half a plate. So the imaginary triangle is not really 3 units high, it's actually about 2.67 units high. The angles of this triangle are 90, 16.68 and 73.32 degrees.

So while neither "73" nor "75" is strictly accurate, the slope is certainly closer to 73 degrees than 75.

[Ritsz]

I believe Bricklink inherited the 75-degree name from LDraw. (It's even more confusing when you discover that the LDraw files for these slopes draw the slope at about 74 degrees.)

The difference in the designation probably comes from an oversight when the first LEGO fans described the part for LDraw. The 73-degree slope brick is three bricks high, and the sloped part is one brick wide. A LEGO brick is 0.8 times wide as it is high. So if you imagine a right triangle that is 3 units high by 0.8 units wide, you can determine the angles using trigonometry. Such a triangle would have angles of 90, 15 and 75 degrees. (90, 14.94 and 75.06, actually).

But most LEGO slopes, including the 73-degree slopes, do not slope continuously to the bottom edge of the piece. There is a lip around the bottom edge to allow space for studs to connect underneath. This lip is slightly higher than half a plate. So the imaginary triangle is not really 3 units high, it's actually about 2.67 units high. The angles of this triangle are 90, 16.68 and 73.32 degrees.

So while neither "73" nor "75" is strictly accurate, the slope is certainly closer to 73 degrees than 75.

Thanks for the explanation man! That clears it all up

[TheLegoDr]

That's mathematical!

See, school can be used for things in the real world. You should tell the masses!

I've never bothered to measure the actual slope on anything. I guess I never cared. I just knew there were slopes of varying degrees and use whatever I needed.

[AndyC]

If you think that's bad, try calculating the angle of what Bricklink (again from LDraw) calls a 33° slope!