If you’re building or upgrading a giant scale RC warbird, one of the most important decisions you’ll make is choosing the right electric retract system. The JP Hobby ER-120 vs ER-150 debate comes up constantly in the giant scale community — and for good reason. Both are precision-engineered, CNC-machined aluminum retract systems from JP Hobby, the world’s leading manufacturer of electric retracts for RC warbirds. But they’re designed for very different aircraft and weight classes. Let’s break down exactly which one you need.
What Are JP Hobby Electric Retracts?
JP Hobby manufactures the most trusted electric retract systems for giant scale RC warbirds and jets on the market. Unlike older pneumatic systems that require air lines, pressure tanks, and complex plumbing, JP Hobby electric retracts are plug-and-play — powered directly from your flight battery or dedicated BEC, controlled by a standard servo channel or their dedicated sequencer/controller.
Every JP Hobby retract is machined from aerospace-grade aluminum alloy, designed for silent operation, repeatable cycling, and long service life even under heavy use. As an authorized JP Hobby distributor in the USA, RC Warbird Models carries the full JP Hobby retract lineup, ships from Texas, and offers expert support on every order.
JP Hobby ER-120: The Mid-Range Powerhouse
The JP Hobby ER-120 is designed for giant scale RC warbirds and jets in the 8–12kg (18–26 lb) gross weight range. It’s the most popular retract in the JP Hobby lineup for 90-inch class warbirds.
ER-120 Key Specs
- Max aircraft weight: 12kg (26 lbs)
- Strut material: CNC machined aircraft-grade aluminum alloy
- Operation: Electric servo motor, no pneumatics needed
- Retract cycle time: Approx. 3–4 seconds
- Gear door support: Yes, via JP Hobby sequencer
- Best for: F4U Corsair 90″, P-51 Mustang 86″, FW-190 84″, P-47 Thunderbolt 84″
The ER-120 hits the sweet spot for most 1/5 scale giant scale warbirds. It’s light enough not to add significant nose weight, strong enough to handle firm grass-field landings, and the gear cycling motion is ultra-smooth — a big deal for scale judges and for stress on the airframe.
JP Hobby ER-150: Built for the Big Iron
The JP Hobby ER-150 steps up significantly in capacity and is designed for giant scale RC warbirds in the 15–20kg (33–44 lb) class — the full-size 1/4 scale monsters that define giant scale flying.
ER-150 Key Specs
- Max aircraft weight: 20kg (44 lbs)
- Strut diameter: 15mm — significantly thicker than ER-120
- Strut material: Heavy-duty CNC aluminum, anodized finish
- Operation: Electric servo, compatible with JP Hobby controllers
- Retract cycle time: Approx. 4–5 seconds
- Gear door support: Yes, with JP Hobby ER-120 controller V2 or sequencer
- Best for: 1/4 scale Spitfire, 1/4 scale P-51 Mustang 104″, large turbine jets, Extra 330, large scale aerobats
The ER-150 is not for the faint of heart — or for light aircraft. If your giant scale warbird weighs less than 12kg, you’re carrying extra weight and cost with an ER-150 that you don’t need. But if you’re running a big 1/4-scale bird or a turbine-powered RC warbird that’s pushing 15–20kg on the scale, the ER-150 is the only JP Hobby retract you should be using.
JP Hobby ER-120 vs ER-150: Head-to-Head Comparison
| Feature | ER-120 | ER-150 |
|---|---|---|
| Max Aircraft Weight | 12kg (26 lbs) | 20kg (44 lbs) |
| Strut Size | Standard | 15mm (heavy duty) |
| Typical Scale | 1/5 scale (80–90″) | 1/4 scale (100″+) |
| Weight | Lighter | Heavier |
| Best For | Most 90″ warbirds | Large 1/4 scale, turbines |
| Price | Lower | Higher |
Which JP Hobby Retract Is Right for Your Warbird?
Here’s the short answer: weigh your aircraft. All-up weight with battery is your deciding factor.
- Under 12kg: JP Hobby ER-120 is your retract. It’s lighter, less expensive, and more than strong enough.
- 12–20kg: JP Hobby ER-150 is the correct choice. Don’t push the ER-120 beyond its design limits — you’ll risk gear collapse on landing.
- Over 20kg: Contact us — JP Hobby makes specialty solutions for turbine-powered aircraft above 20kg.
Common giant scale warbirds that use the ER-120: F4U Corsair 90″, FW-190 84″, P-47 Thunderbolt 84″, P-51 Mustang 86″.
Common giant scale warbirds that use the ER-150: 1/4 scale Spitfire, 1/4 scale P-51 Mustang (104″+), large scale aerobats, light turbines.
Where to Buy JP Hobby ER-120 and ER-150 in the USA
RC Warbird Models is the authorized JP Hobby distributor in the USA, based in Cypress, Texas. We stock the ER-120, ER-150, ER-005, ER-200, JP Hobby controllers, sequencers, and complete gear sets for all major giant scale warbird platforms. Every order ships fast from our Texas warehouse, and you get real pilot support from Chris Hogg — a giant scale warbird pilot who has personally installed and flown every product we sell.
Shop JP Hobby retracts at rcwarbirdmodels.com or contact us for help choosing the right retract for your build.
Conclusion: JP Hobby ER-120 vs ER-150
The JP Hobby ER-120 vs ER-150 decision comes down to your aircraft’s weight and scale. For most 1/5 scale giant scale RC warbirds in the 80–90 inch range, the ER-120 is the right tool. For 1/4 scale and heavier builds, go ER-150. Either way, you’re getting the finest electric retract system available for giant scale RC warbirds — precision engineered, pilot-tested, and backed by RC Warbird Models’ expert USA support.