Q: Where are Helix propellers manufactured?

A: All our propellers are designed and manufactured either at our headquarters at the Merzbrück Airfield (EDKA) in Würselen, Germany, or our sister facility in Chonburi, Thailand. We have been producing carbon fiber propellers since 1990, combining handmade precision with CNC technology.

Q: Can I visit your facility?

A: Yes! Our headquarters are located directly on the airfield. If you are flying in, you can taxi right up to us. For detailed inquiries or consultations, we recommend making an appointment in advance.

Q: Do you sell directly to the public?

A: Yes, we sell directly to customers through our online shop. However, we also have a global network of dealers who may have stock closer to your location.

Q: How do I read the Helix propeller code (e.g., H30F 1,30m R-M-05-2)?

A: The code tells you the exact specification of your propeller:

• H30: Thrust Class (e.g., H30 is for 5–25 hp engines).

• F: Type (F = Fixed Pitch, V = Variable/Ground Adjustable, A = In-Flight Adjustable).

• 1,30m: Diameter in meters.

• R/L: Rotation direction (R = Right/Clockwise, L = Left/Counter-clockwise).

• M: Airfoil profile type (e.g., L, M, S, NM, etc.).

• 05: Pitch angle (mathematical pitch at the tip).

• 2: Number of blades.

Q: What is the difference between Fixed Pitch, Ground Adjustable, and In-Flight Adjustable propellers?

A:

• Fixed Pitch (Plug-in): These are simple, lightweight, and maintenance-friendly. They are ideal for paramotors and ultralights where simplicity is key. The blades slot directly into the hub without adjustment.

• Ground Adjustable: These allow you to change the pitch of the blades on the ground to optimize for climb, cruise, or towing. They offer greater versatility for different flight conditions.

• In-Flight Adjustable:
  These allow for manual or automatic pitch adjustments while flying to provide real-time optimization during different flight phases (take-off, cruise, etc).  

Q: Why use carbon fiber instead of wood?

A: Carbon fiber (CFRP) offers superior durability, weather resistance, and performance. Unlike wood, it does not warp with moisture. Our carbon blades are manufactured in molds, ensuring high dimensional stability and vibration damping, which results in smoother engine operation.

Q: What is the “Plug-in” system?

A: Helix developed the Plug-in system in 1994. It allows 2, 3, or 4 blades to be assembled into a single hub easily. This makes transport easier and allows for the replacement of a single damaged blade rather than the entire propeller.

Q: What is an ARC propeller?

A: ARC, or “Advance Radial Curve” propellers (such as the Helix VTL Talon) are propellers that sweep in the direction of rotation, reducing noise and parasitic drag from tip-vortices. 

Q: What torque settings should I use for installation?

A: Call us before you break something! : )

Q: How do I clean my propeller?

A: Clean the blades after every flight day to remove grass and insects. Use a soft sponge and a mild detergent solution. Avoid harsh chemicals or abrasive materials that could damage the surface finish.

Q: Can I repair a damaged propeller blade?

A: Minor cosmetic scratches on the surface resin can often be polished out. However, if the carbon fiber structure is damaged, cracked, or delaminated, the blade must not be flown. Because our blades are identical by mold, you can often order a single replacement blade rather than a whole new set. Contact us for more information about our repair / replacement services.

Q: Do I need to re-torque the bolts?

A: Yes. We recommend checking the mounting bolts after the first 3 hours of operation and then as part of your regular pre-flight checks.

Q: My propeller doesn’t fit my engine. Can I return it?

A: Please choose carefully. If you are unsure about what type of propeller you need, please contact us. Due to the safety-critical nature of propellers, we cannot accept returns on propellers once they have been bolted to an engine or flown.

Q: How long does shipping take?

A: Orders are typically dispatched within 1–3 business days, but can take longer depending on the type of propeller. Shipping times depend on your location.

Q: I don’t know which propeller fits my engine. What information do you need?

A: To help you find the right prop, we need:

• Aircraft type and model

• Engine type and model

• Reduction ratio (gearbox/belt drive ratio)

• Bolt pattern and center hole diameter

• Maximum desired propeller diameter (clearance)