Arrow setup analysis for a 34-inch arrow at 280 fps. Default specs: 432 gr arrow, 8.4 mm shaft diameter.
Total arrow mass for a 34" build: 432 gr = 289 gr shaft (8.5 GPI × 34") + 143 gr components (point + insert + nock + fletching).
KE: 75.2 ft·lbf — Momentum: 0.537 slug·ft/s
| Distance | Velocity | KE (ft·lbf) | Momentum (slug) |
|---|---|---|---|
| 0 yd | 280.0 fps | 75.2 ft·lbf | 0.537 |
| 10 yd | 275.4 fps | 72.8 ft·lbf | 0.528 |
| 20 yd | 270.8 fps | 70.4 ft·lbf | 0.520 |
| 30 yd | 266.4 fps | 68.1 ft·lbf | 0.511 |
| 40 yd | 262.0 fps | 65.9 ft·lbf | 0.503 |
| 50 yd | 257.7 fps | 63.7 ft·lbf | 0.494 |
This build pairs an extra-long cut with a modern mid-speed compound launch. At 34 inches the shaft is at the far end of the draw-length range, prioritising heavy total mass and a forgiving, momentum-rich flight, and 280 fps is the kind of speed produced by mainstream hunting compounds tuned for a balance of speed and forgiveness. Together they finish at about 432 grains, which is what drives the kinetic energy and momentum figures in the table above.
Because this is an extra-long cut, this much shaft bends considerably at launch, demanding the stiffest static spine on the chart to stay tuned. The launch matters too: with a modern mid-speed compound launch, the dynamic-spine reaction is dominated by a versatile setup that flattens trajectory without giving up the stability a moderate arrow weight provides. Pick a static spine that lands stiff once this 34" shaft and your point weight are factored in, then confirm it with bare-shaft or paper tuning.
At roughly 75.2 ft·lbf this is large-game kinetic energy — this is solid large-game energy, covering mule deer, black bear, and wild hog where deeper penetration through heavier bone and muscle is needed. Keep in mind that an extra-long cut at 280 fps is only the starting point; broadhead choice and shot placement still decide the outcome more than the headline energy number.
A modern mid-speed compound launch pushing roughly 432 grains yields about 0.537 slug·ft/s of momentum. That is heavy penetration potential: this is heavy-penetration momentum, the kind that drives through rib bone and dense muscle and resists deflection on angled shots. Momentum, more than raw kinetic energy, predicts how a 34" arrow holds up against bone and angled entry.
For an extra-long cut launched at 280 fps, dial in rest centre-shot and timing first, then verify broadhead flight against field points at distance. A versatile setup that flattens trajectory without giving up the stability a moderate arrow weight provides — so re-check the tear any time you change point weight, since that shifts the dynamic spine on a 34" shaft more than most archers expect.