The Estes 1788 bulk pack contains 24 1/2A3-4T mini model rocket engines with 30 starters, 24 starter plugs and about 75 squares of recovery wadding. The 1/2A3-4T is a 13 mm mini engine for small, lightweight rockets up to 1 oz, such as the Estes Gnome and Star Hopper. Mini engines need much less field space than standard 18 mm engines.
Key Features
- 24 1/2A3-4T mini engines in one bulk pack
- Includes 30 starters, 24 starter plugs and about 75 recovery wadding squares
- 13 mm mini diameter that only fits rockets designed for mini engines
- 4-second delay, suited to light, fast mini rockets
- Recommended for the Estes Gnome, Star Hopper and other compatible kits
Specifications
| Engine | Estes 1/2A3-4T |
|---|---|
| Diameter | 13 mm (mini) |
| Length | 1.8 in. (4.6 cm) |
| Total impulse | 1.25 N·s |
| Max thrust | 8.30 N (1.9 lb) |
| Thrust duration | 0.30 s |
| Time delay | 4 s |
| Max lift weight | 1.0 oz (28 g) |
| Engine weight | 0.23 oz (6.5 g) |
| Propellant weight | 0.07 oz (1.9 g) |
| SKU | 78TE1788 |
What's Included
- 24 Estes 1/2A3-4T engines
- 30 starters
- 24 starter plugs
- About 75 squares of recovery wadding
Ideal For
Classrooms and clubs flying Gnome bulk packs and other mini-engine rockets.
Frequently Asked Questions
What does 1/2A3-4T mean?
"1/2A" is the total-impulse class (0.626–1.25 N·s), "3" is the average thrust in newtons, and "4" is the delay in seconds between burnout and the ejection charge. The "T" marks an Estes 13 mm mini engine.
Will these fit a standard Estes rocket?
No. They're 13 mm mini engines. Standard rockets use 18 mm engines unless you use an engine adapter. Check your rocket's recommended engines.
Is there a warranty?
Estes warrants its engines against defects in materials or workmanship for one year from purchase. Keep the warranty information that comes in the package. Engines can't be returned by mail.
Ships via US Postal Service only. A physical mailbox or PO Box is required for delivery.