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Petra vs Storm
JYRO Petra · Performance Designs Storm · Canopy explorer
What differs — read from the data
- Petra is made by JYRO; Storm is made by Performance Designs.
- Planform: Petra is listed as elliptical; Storm as semi-elliptical.
- Both have 7 cells.
- Petra is cross-braced; Storm is not.
- Petra is listed in 55–89 sq ft; Storm in 97–230 sq ft.
- The listed size ranges do not overlap.
- The manufacturers publish different systems: Performance Designs lists a maximum exit weight per skill category and size; JYRO lists a recommended wing-loading range and a chart with jump-number bands. They are shown side by side, never translated into each other.
Structural facts only (manufacturer, planform, cells, bracing, sizes, chart system). How each wing flies is described below in the manufacturer's own words; how it flies for you is a question for a canopy coach.
Side by side
| Petra | Storm | |
|---|---|---|
| Manufacturer | JYRO | Performance Designs |
| Status | current | current |
| Cells | 7 | 7 |
| Planform | elliptical | semi-elliptical |
| Cross-braced | yes | no |
| Aspect ratio | not published | 2.14 |
| Sizes (sq ft) | 55–89 · custom sizes available Source: JYRO — Petra product page (page modified 2026-09-15) ↗ | 97–230 Source: Performance Designs — Storm product page ↗ |
| Designed for (manufacturer wording) |
|
|
| Characteristics (manufacturer keywords) | Firm but not hard openings · Highly sensitive toggles and harness · Very long, steep dive · Long recovery requiring pilot input for level flight · High-speed stalls possible with abrupt inputs Source: JYRO — Petra product page (page modified 2026-09-15) ↗ | Soft openings with long snivel · Steep glide · Long recovery arc · Long control range · Powerful bottom-end flare Source: Performance Designs — Storm product page ↗ |
| Opening | Firm but not hard; brisk when terminal (JYRO). | Soft, on heading and very forgiving to minor inconsistencies in body position during deployment; compared to a Spectre, a slightly shorter snivel and ever so slightly quicker inflation. |
| Recovery arc | Long recovery — requires pilot input for level flight (JYRO). | Long recovery arc (product page); will dive longer and lose more altitude in a turn than a comparable sized Stiletto or Silhouette, but not quite as much as a Sabre2. |
| Glide | High maximal glide ratio (JYRO). | Steep glide (product page); great slow flight glide when the brakes (or rear risers) are applied. |
| Speed / dive | Very long, steep dive; 'the most high performance wing you can buy' (JYRO) — no airspeed figures published. | Flies somewhat similar to the Spectre but has a much larger speed range; in full flight greater speed than the Spectre (qualitative; no figures published). |
| Flare | Very powerful and responsive (JYRO). | Lower flare point than Silhouette or Stiletto; flare point similar to the Spectre, but quite a bit more powerful; powerful bottom-end flare. |
| Front risers | Very light (JYRO). | Front riser pressure slightly higher than the Spectre, but requires less input to receive the same response. |
| Rear risers | Range, range and more range; very responsive (JYRO). | Very maneuverable using the rear risers as a very useful tool in extending the glide or turning with less tail deflection. |
| Harness response | Highly sensitive (JYRO). | not published |
| Toggle response | Highly sensitive; high-speed stalls possible with abrupt inputs (JYRO). | First one half of the toggle stroke seems less responsive than a Silhouette or Stiletto; past that you'll see just how sharp it can turn. Extremely agile in deep brakes. |
| Loading system | Recommended wing-loading range 2.5–3.0+ lb/ft² plus a chart with jump-number bands (below). | Maximum exit weight per PD skill category and size (chart below). |
| Manufacturer-stated experience requirements |
| none stated |
| Evidence level | B — Manufacturer product information | A — Manufacturer technical documentation |
Flight wording is quoted or closely paraphrased from each manufacturer's own documents; where a manufacturer publishes nothing for a row it says "not published". No airspeed figures are published by either manufacturer.
Your wing loading on each size
Enter an exit weight to see exit weight ÷ size for every listed size of both canopies and where each number sits on the manufacturer's own chart.
Wing loading = exit weight (lb) ÷ size (ft²). PD's chart lists the MAXIMUM exit weight per skill category — the category shown is the lowest one whose maximum covers your weight, by PD's own rule. JYRO's range is a manufacturer envelope, not a target. The two systems are never translated into each other.
The manufacturers' charts
Petra — JYRO wing-loading chart
Recommended wing-loading range: 2.5–3.0+ lb/ft² Source: JYRO — Petra product page (page modified 2026-09-15) ↗
22 chart cells (exit weight × size → wing loading), colour bands = minimum jump numbers: 2000+ jumps · 2200+ jumps · 1800+ jumps · 1600+ jumps · 2600+ jumps · 2400+ jumps · 2800+ jumps
Source: JYRO — Petra wing-loading chart (image) (WL_Chart_V4) ↗Storm — Performance Designs chart: maximum exit weight (lb) per category
| Size | Student | Novice | Intermediate | Advanced | Expert | Maximum (never exceed) |
|---|---|---|---|---|---|---|
| 97 | N/S | N/S | N/S | 116 | 150 | 175 |
| 107 | N/S | N/S | N/S | 128 | 166 | 193 |
| 120 | N/S | N/S | 120 | 144 | 192 | 216 |
| 135 | N/S | 122 | 149 | 169 | 216 | 230 |
| 150 | N/S | 143 | 173 | 188 | 225 | 240 |
| 170 | N/S | 170 | 196 | 213 | 238 | 255 |
| 190 | 133 | 190 | 209 | 228 | 247 | 266 |
| 210 | 158 | 210 | 221 | 242 | 263 | 273 |
| 230 | 173 | 230 | 242 | 253 | 276 | 299 |
N/S = not suggested by the manufacturer for that category. Weights are maximums, not recommendations.
Source: Performance Designs — Storm sizing / wing-loading chart (FC-0014 Rev. 0 (Storm canopy sizing chart)) ↗Sources
- B JYRO — Petra product page (page modified 2026-09-15) — open ↗
- B JYRO — Petra wing-loading chart (image) (WL_Chart_V4) — open ↗
- B Performance Designs — Storm product page — open ↗
- A Performance Designs — Storm Flight Characteristics (FC-0014 Rev. 0) — open ↗
- A Performance Designs — Storm sizing / wing-loading chart (FC-0014 Rev. 0 (Storm canopy sizing chart)) — open ↗
Evidence levels: A = manufacturer technical documentation, B = manufacturer product information. Knowledge base version canopy-kb-2026.09.23-r3. All sources used on this site
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