AeroTech G78-4G vs H45W-PS: Single-Use Motor Comparison
By Quest Q-jet | Published: 2026-10-21
Category: Comparisons
Compare the AeroTech G78-4G 29mm and H45W-PS 38mm single-use rocket motors. Learn which fits your mid-power flight and which requires assembly.
Quick Answer
Pick the AeroTech G78-4G for a ready-to-fly 29mm motor with a brilliant green flame, or the H45W-PS for a 38mm DMS kit that you assemble yourself.
Diameter and Power Differences
The G78-4G uses a 29mm x 124mm case and delivers a G-class total impulse, making it a solid choice for mid-power rockets that accept 29mm mounts. The H45W-PS is a 38mm x 203mm motor that falls into the H-class range, offering higher total impulse for larger rockets.
Both motors use composite propellant, but the G78-4G features RCS's Mojave Green formulation for a vivid green exhaust. The H45W-PS uses a different propellant blend that produces a white flame.
Assembly vs Ready-to-Fly
The G78-4G is a single-use motor that comes fully assembled. You simply load it into the rocket, install an igniter, and fly. The H45W-PS is a Disposable Motor System (DMS) kit that requires user assembly: you must set the delay time with a Universal Delay Drilling Tool (not included) and pour in the ejection charge before flight.
If you prefer minimal prep, the G78-4G is more convenient. If you want to customize the delay and don't mind a few extra steps, the H45W-PS gives you that control.
Tradeoffs at a Glance
- Motor Diameter: G78-4G: 29mm. Fits many mid-power rockets. H45W-PS: 38mm. Requires a 38mm motor mount. Check your rocket's motor tube diameter before choosing.
- Assembly Required: G78-4G: None. Ready to fly out of the pack. H45W-PS: Yes. Must drill delay and add ejection charge. If you dislike assembly, the G78-4G is simpler.
- Propellant Type: G78-4G: Mojave Green composite – brilliant green flame. H45W-PS: standard composite – white flame. Choose G78-4G for a unique visual effect.
Product Facts
- AeroTech G78-4G 29mm x 124mm Single Use 1-Motor Pack - 77404: Uses the same family of solid propellant as NASA’s Space Shuttle Boosters, and features RCS’s patented Mojave Green composite propellant that produces a brilliant green flame. The green exhaust is visually striking during flight and makes the G78-4G a fun choice for demonstrations or night launches.
AeroTech G78-4G 29mm x 124mm Single Use 1-Motor Pack - 77404 - AeroTech H45W-PS 38mm x 203mm Single Use DMS 1-Motor Kit - 084510: A single-use motor in kit form that requires the user to set the delay time with a Universal Delay Drilling Tool (not included) and pour in the ejection charge. You need to own or buy the UDDT separately, and assembly adds a few minutes of prep time before each flight.
AeroTech H45W-PS 38mm x 203mm Single Use DMS 1-Motor Kit - 084510
Which Motor Should You Choose?
Best for
- Flyers who want a ready-to-use motor with no assembly and a striking green flame (G78-4G).
- Modelers who need a 38mm H-class motor and are comfortable with delay drilling and ejection charge setup (H45W-PS).
Not for
- Anyone who wants a plug-and-play 38mm motor without extra tools or steps (choose the H45W-PS only if you accept assembly).
