---
product_id: 1288439
title: "StratoFins Screw-on Water Rocket Fins - Compatible with 2 Liter Bottles or Smaller"
brand: "relationshipware"
price: "€ 17.45"
currency: EUR
in_stock: true
reviews_count: 8
category: "Relationshipware"
url: https://www.desertcart.ie/products/1288439-stratofins-screw-on-water-rocket-fins-compatible-with-2-liter
store_origin: IE
region: Ireland
---

# Reusable on multiple bottles Screw-on, no tools needed 95% launcher compatibility StratoFins Screw-on Water Rocket Fins - Compatible with 2 Liter Bottles or Smaller

**Brand:** relationshipware
**Price:** € 17.45
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your backyard launches with pro-level precision and style!

## Quick Answers

- **What is this?** StratoFins Screw-on Water Rocket Fins - Compatible with 2 Liter Bottles or Smaller by relationshipware
- **How much does it cost?** € 17.45 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/1288439-stratofins-screw-on-water-rocket-fins-compatible-with-2-liter)

## 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

- • **Durable & Weather-Resistant:** Built to withstand dozens of launches and rough landings with no damage, ensuring long-term performance.
- • **Effortless Assembly & Reusability:** Screw-on design requires no tools or glue—quickly swap fins between bottles and keep launching without downtime.
- • **Complete Kit with Easy Instructions:** Includes 3 fins, an attachment ring, and a clear instruction sheet—everything you need to elevate your water rocket game.
- • **Enhanced Flight Stability & Visibility:** Precision-engineered fins stabilize your rocket for higher, straighter flights, while the vibrant red color ensures you never lose sight.
- • **Universal Fit for Maximum Launch Options:** Compatible with 95% of all launchers, homemade or commercial, so you never miss a flight opportunity.

## Overview

StratoFins Screw-on Water Rocket Fins are a durable, reusable fin set compatible with 2-liter bottles or smaller, designed to fit 95% of launchers without tools or glue. Their screw-on system simplifies assembly and switching between bottles, while the robust construction ensures long-lasting performance and enhanced flight stability. Ideal for hobbyists seeking higher, more controlled water rocket flights with a sleek, professional look.

## Description

Buy Relationshipware StratoFins Screw-on Water Rocket Fins - Compatible with 2 Liter Bottles or Smaller: Sports Water Bottle Accessories - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Great product, easy to use, very durable. - My 2-3 year old son and I have been launching bottle rockets in our yard and in fields around town for the past two summers. After about 200-300 launches, we finally managed to destroy the the foam fins that came with the Quest Aerospace Deluxe Single Water Rocket Set. My wife just got me these StratoFins for father's day, and my son and I love them. They make refilling the rocket much easier compared to the foam fins that we'd been using. These are easier to unscrew and re-screw on while refilling the bottles. Also it's easier to switch between bottles because the same fins can be used on multiple bottles, no need to make new fins for every bottle. We've used our StratoFins for a few dozen launches each on both 1liter and 2 liter bottles, and they work great. I think they'll last many more flights than the foam ones (which I was about to replace with self made replacements before I was surprised with these as a gift. We've had maybe five launches that landed on asphalt or in the gravel on tI hhe edge of the road. There is not a single sign of damage or even any marks that didn't easily wipe off with a shirt tail. The Stratofins came with a flat black rubber gasket inside the female end of the connector, and it creates at least a good a seal between bottle and Stratofins as the seal between the Stratofins and the Quest Aerospace nozzle that we're using. It's fun to use and decorate foam, cardboard or wooden fins when you first get into bottle rocketry. If you're wanting to conduct a range of experimental flights with different rockets or other changes of setup of other elements (other than the fins themselves) these are great. They are perfectly compatible with the Quest Aerospace launcher, and I haven't seen another launcher (store bought or homemade that they wouldn't work with, because they just replicate the bottle's threads on the aft side of the fins. The red color also makes for ideal visibility regardless of whether the sky is blue or overcast.
Review: Pricey, but worth it, including as a backup set with the Relationshipware Launcher. - A little pricey for what they are, they do work great, and are a useful backup if the identical fins in their launcher kit get lost or broken. Of course, you can launch bottles with (or without) these, from about any launching stand, not just Relationshipware's, but they do stabilize the bottle in flight, and also make those bottles look like a "real" rocket. After experiencing a few launches, I'd say the likelihood of breakage is pretty small, and a single broken fin can be replaced 3 times from a spare set, as they are separately fitted. Most likely problem: loss on a windy day. Unless you have a huge open area to launch in, the bottles can go so high that the wind will carry them hundreds of yards, onto fenced properties, roofs, wood lots, weed patches, ponds, lakes or rivers, etc. Launching near Area 51? If the wind is blowing that way, keep the air pressure low! The Relationshipware launcher (with the "extra hole" modification) works so well that a spare set of fins is worth it to insure that increased altitude and "real rocket" looks aren't cut short by a mishap.

## Features

- Compatible with 95% of all available launchers either homemade or commercially available.
- Works with various styles: cable ties, rubber stopper, expanding tube, nozzle, or O-ring.
- No tools or glue required for assembly, simply screw-on to a 2 liter soda bottle or smaller.
- Take your water rocketry to the next level of higher flights with screw-on StratoFins.
- StratoFins kit includes 1 attachment ring and 3 fins along with an instruction sheet.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BA3K0WY |
| Best Sellers Rank | #90,005 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #1,750 in Water Bottle Accessories |
| Customer Reviews | 4.6 4.6 out of 5 stars (536) |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1 ounces |
| Item model number | FIN-1 |
| Manufacturer | Relationshipware |
| Manufacturer recommended age | 14 years and up |
| Product Dimensions | 7.5 x 5.12 x 1.75 inches |

## Images

![StratoFins Screw-on Water Rocket Fins - Compatible with 2 Liter Bottles or Smaller - Image 1](https://m.media-amazon.com/images/I/51-HQenGsQL.jpg)

## Questions & Answers

**Q: what is the internal diameter of the red threaded end of the assembly?  Is it the same as the internal diameter of the threaded 2L bottle opening?**
A: This answer is coming from Dallas Murdoch, Owner of EZ-Launch LLC and a dealer for the red fins.  The internal portion of the top half of the red fin assembly is threaded and screws onto the launch bottle.  Its diameter is 29.6 mm.  The internal diameter of the threaded opening on a two liter launch bottle is 21.0 mm.  The internal diameter of the lower 1/2 of the fin assembly is 21.3 mm.  The internal diameter of the pop bottle where the external threads are located is 21.1 mm.  If you are using an EZ-Launch bottle rocket launcher with the red booster fins, you need to have a round white ABS plastic insert glued to the lower threaded portion of the red booster fins.  This comes with the booster fins when ordered from EZ-launch.com and is necessary to lock the bottle with the fins into the EZ-Launch bottle rocket launcher.  Also, The red booster fin assembly requires a separate black launch pipe in order for the bottle to maintain a steady air pressure and hold the water inside of the bottle.  This also is included in the EZ-Launch bottle rocket booster kit that comes from EZ-Launch LLC.

**Q: Why do these required using an additional nose cone?**
A: the additional nose cone improves aerodynamics and is where the parachute is placed for launch

**Q: What type of plastic is this product made with, my son has sensitivities.**
A: The StratoFins are made from polypropylene (PP), which is the same plastic on the white cover of a Tic Tac Mint container that has the "living hinge."

**Q: Like the nose cone idea. Anybody use a mylar parachute?**
A: We have no experience with using mylar for a parachute, but that sounds like an interesting idea. It should be durable and lightweight, which might make a great choice for material. The only issue might be how well it drapes, since it could be somewhat stiff although you could pre-wrinkle it. Plastic trash bag work for parachutes and mylar wouldn't be too much different from that of than draping. We use rip-stop nylon for our parachutes, which is very durable with great longevity. If you are using it on a water rocket, watch the video link if you haven't seen it already. It will help explain attaching it to a 2-liter soda bottle and offer deployment techniques.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product, easy to use, very durable.
*by B***N on June 16, 2014*

My 2-3 year old son and I have been launching bottle rockets in our yard and in fields around town for the past two summers. After about 200-300 launches, we finally managed to destroy the the foam fins that came with the Quest Aerospace Deluxe Single Water Rocket Set. My wife just got me these StratoFins for father's day, and my son and I love them. They make refilling the rocket much easier compared to the foam fins that we'd been using. These are easier to unscrew and re-screw on while refilling the bottles. Also it's easier to switch between bottles because the same fins can be used on multiple bottles, no need to make new fins for every bottle. We've used our StratoFins for a few dozen launches each on both 1liter and 2 liter bottles, and they work great. I think they'll last many more flights than the foam ones (which I was about to replace with self made replacements before I was surprised with these as a gift. We've had maybe five launches that landed on asphalt or in the gravel on tI hhe edge of the road. There is not a single sign of damage or even any marks that didn't easily wipe off with a shirt tail. The Stratofins came with a flat black rubber gasket inside the female end of the connector, and it creates at least a good a seal between bottle and Stratofins as the seal between the Stratofins and the Quest Aerospace nozzle that we're using. It's fun to use and decorate foam, cardboard or wooden fins when you first get into bottle rocketry. If you're wanting to conduct a range of experimental flights with different rockets or other changes of setup of other elements (other than the fins themselves) these are great. They are perfectly compatible with the Quest Aerospace launcher, and I haven't seen another launcher (store bought or homemade that they wouldn't work with, because they just replicate the bottle's threads on the aft side of the fins. The red color also makes for ideal visibility regardless of whether the sky is blue or overcast.

### ⭐⭐⭐⭐⭐ Pricey, but worth it, including as a backup set with the Relationshipware Launcher.
*by A***R on June 19, 2015*

A little pricey for what they are, they do work great, and are a useful backup if the identical fins in their launcher kit get lost or broken. Of course, you can launch bottles with (or without) these, from about any launching stand, not just Relationshipware's, but they do stabilize the bottle in flight, and also make those bottles look like a "real" rocket. After experiencing a few launches, I'd say the likelihood of breakage is pretty small, and a single broken fin can be replaced 3 times from a spare set, as they are separately fitted. Most likely problem: loss on a windy day. Unless you have a huge open area to launch in, the bottles can go so high that the wind will carry them hundreds of yards, onto fenced properties, roofs, wood lots, weed patches, ponds, lakes or rivers, etc. Launching near Area 51? If the wind is blowing that way, keep the air pressure low! The Relationshipware launcher (with the "extra hole" modification) works so well that a spare set of fins is worth it to insure that increased altitude and "real rocket" looks aren't cut short by a mishap.

### ⭐⭐⭐⭐⭐ Easy to use fins to make awesome water bottle rockets
*by M***D on November 13, 2023*

Easy to use and sturdy fins for water bottle rockets. This is a good company that makes it easy to get flying. Of course, the only downside is the costs. But if you're in a hurry or don't feel like making it all, this is one of the best with guaranteed results.

## Frequently Bought Together

- 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 Ireland*
*Store origin: IE*
*Last updated: 2026-03-02*