---
product_id: 308166301
title: "StratoLauncher IV Water Rocket Launcher + StratoFins"
brand: "relationshipware"
price: "€ 162.99"
currency: EUR
in_stock: true
category: "Relationshipware"
url: https://www.desertcart.at/products/308166301-stratolauncher-iv-water-rocket-launcher-stratofins
store_origin: AT
region: Austria
---

# Universal screw-on nozzle 350+ ft max altitude 125 PSI safety valve StratoLauncher IV Water Rocket Launcher + StratoFins

**Brand:** relationshipware
**Price:** € 162.99
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your STEM game with launches that leave your friends looking up!

## Quick Answers

- **What is this?** StratoLauncher IV Water Rocket Launcher + StratoFins by relationshipware
- **How much does it cost?** € 162.99 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/308166301-stratolauncher-iv-water-rocket-launcher-stratofins)

## 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

- • **Sky-High Launch Power:** Propel 2L soda bottles over 350 feet for epic backyard rocket shows.
- • **Universal Compatibility:** Screw-on nozzle fits most soda bottles from 0.5L to 2L—no more fit issues.
- • **Precision Safety Control:** Built-in 125 PSI valve ensures safe, worry-free pressurization every launch.
- • **STEM-Ready & Upgradeable:** Expandable kit perfect for hands-on learning and future tech add-ons.
- • **Minimal Water, Maximum Thrill:** Only 1 cup of water needed per launch—eco-friendly fun with every blast.

## Overview

The StratoLauncher IV Water Rocket Launcher kit combines durable aerospace-grade materials with a universal screw-on nozzle and a 125 PSI safety valve to safely propel 2-liter soda bottles over 350 feet. Designed for quick assembly and STEM education, it supports multiple bottle sizes, uses minimal water per launch, and offers upgrade paths for an immersive, hands-on rocket launching experience.

## Description

Our StratoLauncher IV kit includes a water rocket launcher made of aluminum, stainless steel, durable plastic, & brass parts, a set of StratoFins & collapsible water fill funnel. Assembly is quick & easy with no further adjustments required regardless if you use our StratoFins or your own homemade rocket or FTC (Fluorescent Tube Cover) rocket thanks to the screw-on nozzle. Employing a nozzle makes this a universal launcher for most any style water rocket and eliminates problems such as bottles not fitting over a launch tube, O-rings wearing out, or accidental launches due to falling collars. The restricted nozzle facilitates lift offs that are 3 – 6 times slower (depending on PSI) than typical water rocket launchers enabling you to see the blast off and yet the nozzle rocket will fly equal to or higher in altitude. Also, the nozzle requires only 1 cup of water per launch for optimum performance although you are free to experiment. StratoLauncher IV ships unassembled with a QR code on the box label that you can scan with your smartphone to view a PDF containing assembly instructions, launch procedures, upgrade kits, videos, and future accessories. NO additional materials are required for assembly, but you will need an adjustable wrench (or a 14mm wrench), 4 & 5mm hex wrench, & a Phillips head screwdriver. Our StratoLauncher IV will enable you to propel a 2 liter soda bottle over 350 ft. into the sky using only water and compressed air from a bicycle pump or an air compressor. Fuel (water & air) is essentially free and readily available allowing countless launches without additional expense. You control when the launch occurs by squeezing the black lever and releasing the lock at the end of the cable from a safe distance of 10 ft. and out of the splash zone. StratoLauncher IV comes in 3 models: Standard, Deluxe, and Ultimate. Any of them can be upgraded to add additional features and all come with a 125 PSI safety valve to prevent exploding bottles while pressurizing.

## 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 our Gen 4 StratoLauncher + StratoFins (screw-on water rocket fins) + fill funnel. Watch assembly video on this listing at the end of the pictures.
- StratoLauncher IV 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 | B071LRLBX9 |
| Age Range Description | Kid |
| Best Sellers Rank | #160,768 in Toys ( See Top 100 in Toys ) #56 in Spacecraft Model Building Kits |
| Brand Name | Relationshipware |
| Customer Reviews | 4.3 4.3 out of 5 stars (189) |
| Educational Objective | STEM |
| Included Components | StratoLauncher, StratoFins, collapsible water fill funnel |
| Is Assembly Required | Yes |
| Item Dimensions | 20.3 x 17.8 x 25.4 centimeters |
| Item Weight | 2 Pounds |
| Manufacturer | Relationshipware |
| Manufacturer Maximum Age (MONTHS) | 1188.00 |
| Manufacturer Minimum Age (MONTHS) | 168.00 |
| Manufacturer Part Number | LCR-5 |
| Material Type | aluminum, stainless steel, brass, ABS plastic |
| Model Number | LCR-5 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Set Name | StratoLauncher IV Water Rocket Launcher + StratoFins Kit |
| Size | 7 x 8 x 10 inches |
| Theme | Space |
| UPC | 700220319066 |
| Unit Count | 1 Count |

## Product Details

- **Age range (description):** Kid
- **Brand:** Relationshipware
- **Item dimensions L x W x H:** 20.3 x 17.8 x 25.4 centimeters
- **Size:** 7 x 8 x 10 inches
- **Theme:** Space

## Images

![StratoLauncher IV Water Rocket Launcher + StratoFins - Image 1](https://m.media-amazon.com/images/I/61JUNVZEtzL.jpg)

## Questions & Answers

**Q: Can you use without water?**
A: Yes, our StratoLauncher IV is designed to use with various fuel sources such as: air only or air and water, as well as dry ice and water although the latter can be a little tricky and dangerous. Not recommended and messy would be things like air and flour, cream of wheat, and similar dry cereals although these do not perform that well and leave a mess behind unlike just air or water.

**Q: Is there a way to fit a remote release? Also, what kind of altitude meter can I get? Thanks**
A: We have plans to develop a remote release this year, but that may take some time. Currently the 10 ft. cable is as remote as it gets. We will be coming out with a cable joiner in the next month or two that will connect another 10 ft. cable making it 20 ft. and it should allow multiples of these if you want to be even further away. Concerning altimeters watch the video link below about mounting an altimeter to a water rocket:
https://youtu.be/26iMMAWt3gw
Under the description you will find a link where these altimeters are available.

**Q: what is the bottle of blue liquid for?**
A: It is 242 Blue Removable Threadlocker for sealing all the fittings that screw into the launcher body. You can see the application of it in the assembly video that is linked in the instruction PDF and it has been uploaded on Amazon as well. It does take 24 hours to cure and harden before you can use the launcher, so plan accordingly.

**Q: How many nozzles come in a kit? (Not including strato fins)**
A: Only 1 nozzle comes in the kit, which can be used on the StratoFins or used without the StratoFins. The StratoFins do not come with a nozzle, since they were designed and sold to be used on most any water rocket launcher whether it uses a nozzle or not. If you need additional nozzles they can be purchased on our site (StratoFins.com).

## Frequently Bought Together

- Relationshipware StratoLauncher IV Water Rocket Launcher + StratoFins
- StratoFins Screw-on Water Rocket Fins - Compatible with 2 Liter Bottles or Smaller
- Relationshipware StratoChute 24" Red Rip-Stop Nylon Parachute for Water or Model Rocket

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*Product available on Desertcart Austria*
*Store origin: AT*
*Last updated: 2026-09-10*