Which oxygen system is right for me?

An oxygen system consists of a cylinder, regulator, oxygen delivery unit, and a cannula or mask. Below we have tried to provide answers to some of the most common questions.

Oxygen Delivery Unit: EDS vs. Constant Flow

EDS	Constant Flow
Uses less oxygen as it is more efficient	Lower cost
Auto adjusts flow with altitude, reducing workload	Does not require batteries
Audible warnings for loss of oxygen supply	–

Cylinder and Regulator Types

Cylinder	Default Regulator	Dimensions (cm)	Recommended for Glider Types
AL – 180 with gauge	CGA-540 no gauge	8.1 x 30	Ideal for small cockpits (e.g., JS3, Ventus 2A, Discus 2A)
AL – 248 with gauge	CGA-540 no gauge	11.1 x 27	Early JS1s
AL – 415 with gauge	CGA-540 no gauge	11.1 x 41	Large cockpit single-seaters (e.g., Std. Cirrus, Nimbus)
AL – 682 with gauge	CGA-540 no gauge	11.1 x 65	Large pure two-seaters (e.g., Duo Discus, Nimbus, ASH25)
CFF – 480 with gauge	CGA-540 no gauge	11.4 x 36.5	Many modern Schempp-Hirth gliders, including Ventus 3M, Arcus T and M, Duo Discus XLT
KF – 011 with gauge	CGA-540 no gauge	9.3 x 48.5	DG, LS, Schleichers, Glasflugel – lightweight alternative to Steel 3L
Steel 3L no gauge	DIN477 with gauge	10 x 58	Perfect fit for most pure DG, LS, PIK, and Glasflugel gliders
Steel 2L no gauge	DIN477 with gauge	10.5 x 44	Ventus 3T + 3F

Mounting

For mounting the EDS unit or constant flow flowmeter, we recommend heavy-duty Velcro to affix the unit to the side of the cockpit. It should be visible and accessible to the pilot during flight but should not obstruct any cockpit controls. In some gliders, it can be mounted in a cockpit’s side pocket.

For mounting your cylinder, ensure the gauge is easily visible for monitoring oxygen levels in flight or before take-off. The cutoff valve should also be accessible during flight or before take-off for safety.

Filling Adapters and Accessories

Once your oxygen kit is installed, consider how to refill your cylinder. Most established wave sites will have facilities for CGA540 or DIN477 threads. You can also fill your cylinder at a local dive shop, but a dive-shop adapter may be necessary.

FAQs

What comes in the kits?

• O2D1 (single) or O2D2 (dual) EDS unit
• Standard and flare tip cannula
• EDS face mask (for use above 18,000ft)
• Carry bag and batteries

Can Navboys help with oxygen system installation?

Yes, we can assist with installation. Please contact us through our contact form.