--- product_id: 43502072 title: "StratoLauncher IV Ultimate Water Rocket Launcher + StratoFins Kit" brand: "relationshipware" price: "€ 218.83" currency: EUR in_stock: true category: "Relationshipware" url: https://www.desertcart.hr/products/43502072-stratolauncher-iv-ultimate-water-rocket-launcher-stratofins-kit store_origin: HR region: Croatia --- # Fits 0.5L to 2L bottles 350+ ft max flight 125 PSI safety valve StratoLauncher IV Ultimate Water Rocket Launcher + StratoFins Kit **Brand:** relationshipware **Price:** € 218.83 **Availability:** βœ… In Stock ## Summary > πŸš€ Elevate your STEM game with every launch! ## Quick Answers - **What is this?** StratoLauncher IV Ultimate Water Rocket Launcher + StratoFins Kit by relationshipware - **How much does it cost?** € 218.83 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/43502072-stratolauncher-iv-ultimate-water-rocket-launcher-stratofins-kit) ## Best For - relationshipware enthusiasts ## Why This Product - Trusted relationshipware brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Sleek, Durable Build:** Crafted from aluminum, stainless steel & brass for long-lasting performance - β€’ **Sky-High Launch Power:** Propels 2L bottles over 350 feet for epic backyard shows - β€’ **STEM-Ready Expandability:** Fully upgradeable kit perfect for hands-on science and engineering exploration - β€’ **Precision Pressure Control:** Built-in 125 PSI safety valve ensures safe, consistent launches every time - β€’ **Universal Bottle Compatibility:** Supports most soda bottles from 0.5L to 2L, making upgrades effortless ## Overview The StratoLauncher IV Ultimate Water Rocket Launcher + StratoFins Kit is a premium, easy-to-assemble metal launcher designed for ages 14 to 99. Featuring a 125 PSI safety valve and compatibility with soda bottles from 0.5L to 2L, it can propel rockets over 350 feet. The kit includes precision components like a pressure gauge and aerodynamic fins, making it a perfect STEM tool that’s fully upgradeable and built to last with high-quality materials. ## Description desertcart.com: StratoLauncher IV Ultimate Water Rocket Launcher + StratoFins Kit : Toys & Games ## Features - Easy to assemble metal water rocket launcher with a 125 PSI safety valve. Rocket will NOT fly straight without an aerodynamic nose cone made from a second soda bottle and use only 1 cup (200 ml) of water. - Kit includes StratoLauncher IV, StratoFins, ball head, pressure gauge, QConnect w/valve (tank not included). Watch assembly video on this listing at the end of the pictures. - StratoLauncher IV Ultimate will propel a 2 liter plastic (PET) soda pop bottle over 350 ft. in the sky. Watch the last minute of the assembly video for launch procedure. - Supports most .5L, 1L, 1.25L, 1.5L, 2L soda bottles @ air pressures as low as 15 PSI up to 120 PSI. - Kit is fully upgradeable, expandable, & can be accessorized into a complete launching system for STEM. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B071SJQ762 | | Age Range Description | 14 - 99 years | | Brand Name | Relationshipware | | Customer Reviews | 4.6 4.6 out of 5 stars (103) | | Educational Objective | STEM | | Included Components | StratoLauncher IV, StratoFins, ball head, pressure gauge, QConnect with valve | | Is Assembly Required | Yes | | Item Dimensions | 8 x 7 x 12 inches | | Item Weight | 2.9 Pounds | | Manufacturer | Relationshipware | | Manufacturer Maximum Age (MONTHS) | 1188.00 | | Manufacturer Minimum Age (MONTHS) | 168.00 | | Manufacturer Part Number | LCR-7 | | Material Type | aluminum, stainless steel, brass, ABS plastic | | Model Number | LCR-7 | | Theme | Rocket | | UPC | 700220319080 | | Unit Count | 1.0 Count | ## Images ![StratoLauncher IV Ultimate Water Rocket Launcher + StratoFins Kit - Image 1](https://m.media-amazon.com/images/I/61NkbLJuD0L.jpg) ![StratoLauncher IV Ultimate Water Rocket Launcher + StratoFins Kit - Image 2](https://m.media-amazon.com/images/I/61RxerjZhRL.jpg) ![StratoLauncher IV Ultimate Water Rocket Launcher + StratoFins Kit - Image 3](https://m.media-amazon.com/images/I/71bCaWObGjL.jpg) ![StratoLauncher IV Ultimate Water Rocket Launcher + StratoFins Kit - Image 4](https://m.media-amazon.com/images/I/61ubuRbSyOL.jpg) ![StratoLauncher IV Ultimate Water Rocket Launcher + StratoFins Kit - Image 5](https://m.media-amazon.com/images/I/61QGBZFLwgL.jpg) ## Questions & Answers **Q: What is the difference between the deluxe kit and ultimate kit, other than cost?** A: Both the Deluxe and Ultimate models are exactly the same other than the Ultimate includes 4 additional parts, which can be purchased as an upgrade kit separately if you buy the Deluxe model. These 4 additional parts are a mini ball valve, a Quick Release M Plug, a Quick Release connector, and a 1/4" NPT barbed fitting. This creates the Quick Connect Water Fill System that attaches to an inexpensive 2 gallon tank sprayer, which you would need to buy from a local hardware store. Our water fill system fuels a rocket very quickly yielding about 30 launches with a 2 gallon tank and makes transporting water to the field easy without having to drag additional jugs or bottles of water along. Thank you for asking the question. If you have any more questions, we are happy to provide answers. **Q: So i see this uses Gardena style nozzles. I know that standard Gardena nozzles do not fit bottles, so where can i get addtional nozzles??** A: There a few shops online that sells them, you can also 3D print them **Q: Do I really need the 2gl tank sprayer to properly operate this launcher?** A: No you do not. If you are doing many sequential launches, it does make it easier/quicker to hook up a tank sprayer to the launcher to fill the rocket. If you are using a tank sprayer, you just lock the empty rocket onto the launcher, turn the ball valve on the launcher to open the water inlet that the sprayer is quick-connected to, and close it when the desired amount of water has flowed into the rocket. If you don't have the sprayer, you just have to fill the rocket each time using the funnel before you place it on the launcher. **Q: Can I use a higher tank spray?** A: Not sure what you mean by a higher tank spray, unless you mean a higher than 2 gal. capacity, which is what we typically recommend. If that is the case, than yes you can use a higher volume tank or a taller tank or even a higher pressure tank sprayer. The restrictions are not on the tank sprayer, but on the amount of water that fills the rocket, which should be limited to about 1 cup of water. A 2 gal. tank sprayer will yield about 30 launches. The other restriction would be the max PSI for pressurizing the rocket, which is 120 PSI and the safety valve will release at 125 PSI. I hope this answers your question otherwise please provide more detail when asking your question. ## Frequently Bought Together - Relationshipware StratoLauncher IV Ultimate Tilting Water Rocket Launcher + StratoFins Kit - Relationshipware StratoChute 24" Red Rip-Stop Nylon Parachute for Water or Model Rocket - StratoFins Screw-on Water Rocket Fins - Compatible with 2 Liter Bottles or Smaller --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/43502072-stratolauncher-iv-ultimate-water-rocket-launcher-stratofins-kit](https://www.desertcart.hr/products/43502072-stratolauncher-iv-ultimate-water-rocket-launcher-stratofins-kit) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-07-13*