AeroTech G61W vs G40-4W: Picking a 29mm Motor
By Quest Q-jet | Published: 2026-11-02
Category: Comparisons
Compare the AeroTech G61W reload kit and G40-4W single-use motor on hardware needs, delay choice, and field convenience to pick the right 29mm motor.
Quick answer
Choose the AeroTech G40-4W single-use motor if you want a no-hardware, four-second-delay flight for a mid-power rocket. Choose the G61W-14A RMS-38/120 reload kit only if you already own or plan to buy the RMS-38/120 hardware and want a longer 14-second delay.
The hardware decision comes before the motor decision
The G40-4W arrives as a complete single-use motor, so it flies straight from the pack. The G61W-14A is a reload kit: it is an aluminum-cased reusable motor assembled by the user, and it requires AeroTech RMS-38/120 motor hardware, sold separately as a complete set or as individual parts. That hardware requirement is the real dividing line in this comparison, not the propellant label.
Delay timing changes the rocket you can fly
The G40-4W carries a four-second delay, which suits a relatively light, draggy airframe that slows quickly after burnout. The G61W-14A carries a 14-second delay, which only makes sense in a rocket that is still climbing or coasting for a long time. Neither delay is adjustable on the motor itself, so match the delay to your rocket's descent profile before you buy.
Where the reload kit earns its keep
Reload kits make sense for flyers who already run RMS-38 hardware and want repeatable flights from the same casing. The trade-off is assembly time and the need to keep hardware parts organized. If you are new to reloads, note that high-power RMS reload kits are not compatible with mid-power RMS products, so confirm your hardware family before ordering.
Trade-offs at a glance
- Hardware cost and setup: The G40-4W is ready to fly out of the pack. The G61W-14A requires separate RMS-38/120 hardware plus assembly time. Count hardware cost before comparing sticker prices.
- Delay fit: Four seconds on the G40-4W suits short, draggy flights. Fourteen seconds on the G61W-14A suits long coast phases. Simulate descent time before committing to either delay.
- Hardware compatibility: High-power RMS reload kits are not compatible with mid-power RMS products, so verify your casing family before ordering the G61W-14A. Check the hardware label, not just the motor diameter.
Product facts
- AeroTech G61W-14A RMS-38/120 Reload Kit (1 Pack) - 076114: AeroTech RMS-38/120 reload kit assembled by the user in reusable aluminum hardware. You must already own or buy RMS-38/120 hardware before this kit can fly.
AeroTech G61W-14A RMS-38/120 Reload Kit (1 Pack) - 076114 - AeroTech G40-4W 29mm x 124mm Single Use 1-Motor Pack - 74004: AeroTech G40-4W single-use motor with a four-second delay in a polymer case. It needs no motor hardware, so it is the simpler choice for a one-off mid-power flight.
AeroTech G40-4W 29mm x 124mm Single Use 1-Motor Pack - 74004
Which motor fits your flight
Best for
- Flyers who want a no-hardware single-use motor for a mid-power rocket
- Short-delay flights in light, draggy airframes
- One-off launches where assembly time is unwanted
Not for
- Flyers without RMS-38/120 hardware who want the G61W-14A
- Rockets that need a long coast delay but no reload hardware
- Anyone unsure whether their casing is high-power or mid-power RMS
