Quick Question About Dive Machines

Oblivion is at 87* because it's wheels need to be kept in contact with the track during the drop, but Shiekra and Griffon's drops both are truely vertical at 90*. What difference was made to let the newer DM's hit 90*, and how does it work?

There are wheels that are always going to be in contact with the track. Not sure what you mean. There's always those on the underside of the track.

That's what I heard that B&M had to make Oblivions drop 87* so the road wheels stayed in contact with the track the entire duration of the drop. While Sheikra and Griffon both achieve 90*. What's the difference that was made over time to allow them to achieve 90* drops.

I've read about this and I think I get it. Basically, when B&M made Oblivion their wheel set up was such that there had to be a small gap between the track and the upstop wheels when the train was sitting on level track. The drop on Oblivion is sloped at 87 degrees so that the upstop wheels stay on the track the whole way down. If the drop was exactly vertical, the train would go into true freefall, allowing the train to rattle between the main and upstop wheels on the way down.

By the time they built Sheikra, they had designed spring loaded wheel systems so that the main and upstop wheels could both stay in contact with the track the whole way down a 90 degree drop, without the train rattling back and forth.

Hope that makes sense, I know it's not a perfect description.

Thanks, makes sense now all I need to know is how the spring loaded wheels work to keep the train in contact with the track.

Is it that difficult to think about how they work? A spring pushes the wheels against the track.

Ok, is it that difficult to answer me without sarcasm, I had a question if your gonna be sarcastic why bother answering?

I didn't mean to be sarcastic at all. It's too bad you picked it up that way.

Yea, too bad indeed......

[hyyyper]

Originally posted by guitarplayer673

I've read about this and I think I get it. Basically, when B&M made Oblivion their wheel set up was such that there had to be a small gap between the track and the upstop wheels when the train was sitting on level track. The drop on Oblivion is sloped at 87 degrees so that the upstop wheels stay on the track the whole way down. If the drop was exactly vertical, the train would go into true freefall, allowing the train to rattle between the main and upstop wheels on the way down.

By the time they built Sheikra, they had designed spring loaded wheel systems so that the main and upstop wheels could both stay in contact with the track the whole way down a 90 degree drop, without the train rattling back and forth.

Hope that makes sense, I know it's not a perfect description.

Do you please have a source for this, because honestly, this is one of the most ridiculous things I've ever read.

[gouldy]

^ HAHA

I was thinking that too, when I read it.

yay! sauces! i like barbecue. and tomato, and mayonnaise. oh and chocolate! YAAAAAAY!

[Coasterkidmwm]

What the hell are you talking about?

[gouldy]

Sauces.... duh.

Yeah it might be completely wrong, and I really don't remember where I read it so yeah, no source. It kinda makes sense though if you think about it. If you have wheels spaced out further that the diameter of the track, and drop that train straight down at exactly 90 degrees, you're going to get the train bouncing back and forth on the track (only a little of course) because it's in complete free fall... I don't know, made sense to me.[sillyme]

You know, you will get a certain amount of airtime on a 97* drop too...
It is inevitable, except maybe if they'd slowly pull the train to 87*, and than drop it, but that would be silly.
Well, IMO, your theory isn't right...

the wheels have nothing to do with airtime.

i think the wheels have been simply redesigned over the years to better remain in contact with the track.

sheikra/griffon:
http://www.rcdb.com/ig3631.htm?picture=31
http://www.rcdb.com/ig2662.htm?picture=75

oblivion:
http://www.rcdb.com/ig777.htm?picture=21

all the above may be tru it may be not but you know what my explanation would be, they just didnt have the room to make it 90 degrees and had to settle for 87 with it being in such a confined space and with the hight restriction. just my thoughts

i think they did it because the track wasn't high enough to bank to the full 90 degrees, so they did it 87 and noone noticed but the people who really cared

That makes sense too, I read the stuff on wikiepedia so yea I had to come here to confirm it because wiki lies alot.

B&M didn't want the moon's gravity pulling the ride over while it was being put up. With it at a low angle of 87 degrees, it could rest on a support.

[Coasterkidmwm]

That makes sense!

Originally posted by Canadmos

B&M didn't want the moon's gravity pulling the ride over while it was being put up. With it at a low angle of 87 degrees, it could rest on a support.

oh sweet jesus wat