17 replies to this topic

[KT-creations]

Im building a boomerang coaster and it will be up as soon as the automatic lift is done. How do you make a lift that brings the cart up backwards and front while still detaching it at the top of the lift.

[Blackkitty]

Ask steelsprectrum or JP- Knex they have done it very well.

[floris2burn]

I guess you'll have to make the chain go so that it leaves the track nearly at the top. Just like normal coasters, but here it'd release the coaster before it reaches the top. Don't forget to cover the chain dog. It'll hit the chain when it re-enters the station after the whole ride.

[KT-creations]

I'm building a boomerang and i got everything except for the
lift need help!! I was thinking of taking out the chain catcher on the cart and putting a connector on the chain. that would do the job put how would i time it perfectly.??Please help if you could. THanks

[ForgotToGrowUp]

how does a thread with 0 responses (before this one) get a 5 star rating???????????

(must mean this one is better than the other 2 you created with the same question)

[pkiknex25]

One thread would have sufficed.

The real boomerangs use a car that is attached to a cable to hook on to the train and pull it up. Create something like that.

[KT-creations]

i already made the automatic lift for the left side where the car goes up backwards and it works perfect. I still got the problem with the other side that comes after the loop. Hows the car going to catch on????

[RollerManiac]

I've made something like this before. I also know another way to do it.

[~stεεlspectrum~]

I can help. A few months ago I recreated Invertigo, which is the same thing as Boomerang but inverted.

What you do is: Take a gray connector. Cut across the top of the hole part (I used tile clippers). Then put it onto a chain link (you may have to bend it a little). Lastly, use a rubber band or some tape to hold it in place. It should be able to fold down toward the chain, but still pop back up to catch onto the underside of the train.

Here is the finished product:



And a test video: YouTube - Invertigo update 1

[pkiknex25]

Steel, you are brilliant.

[floris2burn]

Problem solved it seems

And nice work on the automation mechanism steel!

[KT-creations]

steel thanks! your so smart. im almost done with it and its looking great. The video will be up soon. Thanks for the help once again.

got it to work thanks to steelspectrum. look in the tutorials section he posted some pics of what to do on my post. IT WORKS GREAT!!!

Steel i watched your update 1 video of invertigo and i love the idea. I recreated it but the opposite way since mine is a sitdown while your is a inverted one. im having trouble with it turning on when the car hit the little clip you told me to make. Also when the clip reaches the top to reverse the motor it stops before it starts to reverse. I does turn off by it self?? Plz help steel? thanks

[~stεεlspectrum~]

I improved the switch mechanism after the first update; I made it a lot more reliable. You can probably see it in the last few updates and the final video. Sorry I don't have time to post a more specific answer...if you have any further questions, please ask.

[KT-creations]

the problem i got is that when the car is going up and the clip that is supposed to reverse the motor turns off before it reverses. so i put new batteries in hoping it would go faster a reverse it but same problem. Works when i push the lever gentl with my fingers.

Perhaps a miny tutorial if you hhave time but if not don't worry ill figure sometin out eventually

AWWW why are boomerang coasters so hard?? when it will be done it will be really nice. Very similar to Jpcoaster's boomerang which is great and mine is going to be automatic like invertigo from steel spectrum. I am going to be using the same mechanisms steelspectrum used on his ride invertigo as you could see on youtube invertigo update 1. My Boomerang---++=====>>>COMING SOON. stay tuned.

<KT-creations>

[~stεεlspectrum~]

So the lever turns the motor off, but doesn't go far enough to switch it the other way? Try experimenting with different connectors on the chain until you find one that works, that's what I did.

[KT-creations]

Heres an update video. HOpe you like it.



YouTube - K' nex boomerang coaster update 1

[~stεεlspectrum~]

Okay, on the second lift, the pin that the chain will push is made of 2 green connectors with black hand-shaped pieces. You could try removing the black-hand pieces, and instead snap the rod directly into the green connectors. If that makes it worse, you could make that part of the lever longer instead of shorter. Hope this helps.

[KT-creations]

alright ill try but can u build a small replica of what you had and post some pics of how it should look. im really trying to make this fully automatic.

a tutorial would help alot cause some others are building boomerangs and they are stuck like me somewhat.