The Estes 1502 pack contains four 1/4A3-3T mini model rocket engines with four starters and four starter plugs. The 1/4A3-3T is a low-power 13 mm mini engine for lightweight rockets up to 1 oz (28 g). It's ideal for first flights, small fields and keeping mini rockets like the Gnome and Lunar Scout low enough to watch the whole flight.
Key Features
- 4 1/4A3-3T mini engines with 4 starters and 4 starter plugs
- Estes' lowest-power class, good for test flights and small launch areas
- 13 mm mini diameter with a 3-second delay
- Recommended for the Estes Gnome, Lunar Scout and other compatible kits
Specifications
| Engine | Estes 1/4A3-3T |
|---|---|
| Diameter | 13 mm (mini) |
| Length | 1.75 in. (4.4 cm) |
| Total impulse | 0.625 N·s |
| Max thrust | 4.90 N (1.1 lb) |
| Thrust duration | 0.25 s |
| Time delay | 3 s |
| Max lift weight | 1.0 oz (28 g) |
| Engine weight | 0.21 oz (6 g) |
| Propellant weight | 0.05 oz (1.3 g) |
| SKU | 78TE1502 |
What's Included
- 4 Estes 1/4A3-3T engines
- 4 starters
- 4 starter plugs
Ideal For
First flights of mini rockets, small schoolyards and younger rocketeers (with supervision).
Frequently Asked Questions
What does 1/4A3-3T mean?
"1/4A" is the total-impulse class (0.313–0.625 N·s), "3" is the average thrust in newtons, and "3" is the delay in seconds between burnout and the ejection charge. The "T" marks an Estes 13 mm mini engine.
Will these fit an 18 mm rocket?
Not without an engine adapter. They're 13 mm mini 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.