| Standard Estes & equivalent body tubes (Weights for 18" length) | ||||
| Designation | ID | OD | Weight | Notes |
|---|---|---|---|---|
| BT5 | 0.515" (13.08mm) | 0.541" (13.74mm) | 0.205 oz (5.8g) | 13mm Motor Tube |
| BT20 | 0.710" (18.03mm) | 0.736" (18.69mm) | 0.286 oz (8.1g) | 18mm Motor Tube |
| BT50 | 0.950" (24.13mm) | 0.976" (24.79mm) | 0.384 oz (10.9g) | 24mm Motor Tube |
| BT52 | 0.988" (25.10mm) | 1.014" (25.76mm) | 0.441 oz (12.5g) | Slip fit over BT50 |
| BT55 | 1.283" (32.59mm) | 1.325" (33.66mm) | 0.635 oz (18g) | |
| BT60 | 1.595" (40.51mm) | 1.637" (41.58mm) | 0.705 oz (20g) | |
| BT70 | 2.175" (55.25mm) | 2.217" (56.31mm) | 1.291 oz (36.6g) | |
| BT80 | 2.558" (64.97mm) | 2.600" (66.04mm) | 1.975 oz (56g) | |