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Competitions and projects
Air-frame reducers / transitions
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UKROC competitions usually require you to change the size of your air frame at some point. The 2025 competition is no exception. We produce a variety of body tube reducers for you to use.

We offer heavy duty (thicker walled) options and standard walled reducers too.
Our transitions are printed from carbon fibre reinforced 3D printed nylon, we use two different types. Our main type that is suitable for most uses is printed from a material called PAHT-CF, we also offer a premium version printed from a material called PPA-CF. You can further increase the strength of your PAHT-CF or PPA-CF by annealing them in an oven should you choose to do so (but the product is absolutly fine and impressive as is).

PAHT-CF
This material offers heat deflection temperature of up to 194 degrees celcius and a tensile strength of 92 MPa. This material is tough, it wipes the floor with standard 3D printed materials like PLA.

PPA-CF (Premium)
This material offers heat deflection temperature of up to 227 degrees celcius and a tensile strength of 168 MPa. This material is a lot stronger than PAHT-CF, however if you want a bit more flexibility or are not creating an extreme rocket the PAHT-CF options should be absolutely fine!

PLA
We do not print any parts with PLA as the nylon materials out perform them in every regard. It has a Tensile strength of just 35 MPa compared with 92 and 168 for the materials we use for example.

BrandModelrockets.co.uk Diameter66mm Dimensions66mm x 140mm Hazard classNot dangerous goods Inside diameter51.4mm Length140mm
BrandModelrockets.co.uk Diameter75mm Dimensions75mm x 154mm Hazard classNot dangerous goods Inside diameter44.8mm Length154mm
BrandModelrockets.co.uk Diameter66mm Dimensions66mm x 140mm Hazard classNot dangerous goods Inside diameter48.8mm Length140mm
BrandModelrockets.co.uk Diameter66mm Dimensions66mm x 140mm Hazard classNot dangerous goods Inside diameter40.5mm Length140mm