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Availability:
In Stock.
Arrives
Wednesday, Feb 4
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Features
- BUILD A 19FT LONG ROLLERCOASTER: With over 640 pieces including rods, connectors, 19 ft of track, motorized power and a silver coaster car, this awesome building set lets you create a cyclone of twisting roller coaster fun in your living room!
- EASY TO BUILD 2-IN-1 MODEL: Discover non-stop action with this toy building set and download the exclusive instructions to build an incredible second model, the Tsunami Surge Coaster! With 2 models to build, kids and adults alike will enjoy hours of fun
- EDUCATIONAL TOY: This construction set helps strengthen fine motor skills, logical thinking and problem solving. Perfect for capturing kids interest in basic construction, science and design, while promoting concentration and logical thinking
- TOYS FOR 9 YEAR OLDS +: Ideal for encouraging young children to build and create while developing an understanding of STEM subjects, these kids building sets are great for children aged 9 and up
- IDEAL GIFT FOR CHILDREN AND ADULTS: A great birthday gift or Christmas present for everybody! This amusement park set is a great gift for children looking for new challenges. This 19 foot long roller coaster building set for kids opens the door for hours of creative design play
Description
Bring a wave of fun from the ocean to your living room with the new Typhoon Frenzy Roller Coaster Building Set from K'NEX! Build with over 649 K'NEX parts & pieces like rods, connectors and track, and add motorized power to send the silver coaster car twisting and turning through over 19 feet of swirling, non- stop action! Download exclusive instructions to build an incredible second model, the Tsunami Surge Coaster! All K'NEX rods and connectors are made in the USA! Motorized chain lift. Ages 9+
Product Dimensions: 34.15 x 13.29 x 33.3 inches
Item Weight: 1.7 pounds
Manufacturer: K'NEX
Item model number: 51438
Batteries: 2 AA batteries required.
Is Discontinued By Manufacturer: No
Date First Available: July 27, 2013
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Feb 4
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Good quality and fun. My 8 y.o. enjoyed assembling and likes to play with it now.
Reviewed in the United States on November 20, 2025 by Inna
Grandson loved it
Reviewed in the United States on December 30, 2025 by Naperville Mom
Wish I could give this a 5 ⭐️. Unfortunately, the kids need an adult for assembly, three of the red rods were not good as can see. Also, there are parts where they keep unlinking. I wish they had spare parts easily available like legos. It was a fairly complicated build with the instructions provided, it took me some time to build but my child loves it. I think that parts need to be designed better and have additional spare parts of each just in case one encounters issues. Overall the system is fun to see and is appealing. My son loves it even if I had to solve with tape while I see if they even have spare parts or additional rollercoaster cars.
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Reviewed in the United States on December 25, 2025 by Diane Diane
My first K'Nex building set and I have to say it is great. I build it on my YouTube channel if you want to see it in action (search for KTAF in google or on Youtube and you'll find Kid Toys Are Fun). A little bit more challenging to build than say a 649 piece LEGO model, but that makes it fun too. I would say a 9 year old could probably build it but might need a couple of minutes of help now and then. Once built it is great to turn on and just watch, repeat daily! The coaster runs down really smooth and fast, goes back up on the chain, it really is what you'd expect - great fun build and great fun motorized model. Takes a few hours if it is your first K'Nex build. It's big!
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Reviewed in the United States on August 5, 2015 by Gav
We are a big K’NEX fans in this house and my boys have been asking for a roller coaster set. Ages 12, 9 and 6. They needed a little help here and there. If you’ve never done a K’NEX set, it’s not as in depth of directions as Legos. A lot of it relies on looking at the picture and figuring it out. A few trial and errors but overall fun to put together. Most important thing it works great! It’s sturdy and the chain stays on with no problem. A couple reviews said that they were missing pieces, but we actually had a few pieces left over. So no issues with that! Would recommend.
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Reviewed in the United States on June 16, 2023 by Kristen
Reviewed in the United States on January 29, 2025 by brett leamaster brett leamaster
I bought this back in April for my son, but we didn't put it together until now. We are missing a few pieces that are keeping us from finishing it. Really frustrating.
Reviewed in the United States on November 24, 2024 by Michael Lupa
The media could not be loaded. First of all, when the product arrived, the box was bent as if it had been opened before and the pieces were strewn around the shipping box (see photo). Fortunately, nothing was missing and I didn't have time to get another present for my son, so I just shoved everything back in the box and wrapped it. The box was unsightly but I successfully disguised it with wrapping paper. Although the box for this item says age 9+, I doubt any 9-year old could build this by themselves. If you buy this, be prepared to spend multiple hours "helping" your child decipher the instructions and build this product. The instructions consist of only pictures, some of which aren't that clear. Two of the pieces were outright defective -- one end of the stick was "bald" so it wouldn't click into the connector piece -- so I literally had to fasten these pieces together with tape (see photo). I didn't take photos of the bald pieces before I put the tape on them. There were no extras of the defective pieces so I just had to make them work. For several other pieces, the snaps don't hold tight, so when the roller coaster zips by, or if someone bumps the structure, the pieces come unsnapped, so we are constantly snapping stuff back together. Also, one piece broke, but I was able to work around it. Finally, the final product has several design flaws. When we built the track exactly as stated in the instructions, the roller coaster car kept bumping into one of the "walls" and stopping. I was able to tinker with the track and reconfigure it so the car no longer hits the side. However, as you see from the video, the car does not roll around the track continuously by itself -- it needs "help" when it gets to the bottom, and this was true even before I reconfigured the track to fix the wall-crashing situation. My son (6 years old) and I had some good "bonding time" building this, even though it was tedious and he complained a bit. He was proud of the finished product and enjoys playing with it, but this is not something most young kids will be able to build by themselves, particularly with the defective pieces, design flaws, and unclear instructions. I was prepared to help my child because he's 6 and the toy is marketed for ages 9 and up, but even if your child is older or very advanced, the issues I mentioned above make this a challenging build, even for adults.
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Reviewed in the United States on December 26, 2024 by Joanovarq Joanovarq