Nylon Rocket Parachutes
Nylon Parachutes for Model and High Power Rockets
Made with Professional Grade Equipment and longer shroud lines for better deployment
Red and Yellow Nylon Parachutes
Now in Sizes 12 inch up to 48 inch in Red and Yellow color. Yellow only for 60"
6 Sided/ 6 shroud lines - available in 12, 15, 18, and 24 inch
8 Sided/ 8 shroud lines - available in 30, 36, 48, and 60 inch. (yellow only for 60")
- These are quality parachutes for general use - for parachute sizing, see the weight / size chart below:
- 12, 15, 18, and 24 inch parachutes are generally used for model and mid power rocket
- 24, 30, 36, 48, and 60 inch parachutes are generally used for mid and high power rocket
- Made with Rip-Stop nylon fabric so tears don't run.
- All edges sewn with professional grade Serger Sewing equipment to prevent fraying.
- Braided Nylon cords - each shroud length about the diameter of the parachute ( each cord is about twice the diameter )
- Polyester thread used
- Machine Washable
- Made under fair working conditions and wages. No child labor used
Diameter is measured across the parachute and is from point to point.
Color may vary with lots. Sunward may not be able to guarantee exact color
The Mathematics of Flat Parachutes by John Brohm is an excellent introduction to the topic. Thanks to John Brohm for permission to provide it here..
|DESCENT RATE AND PARACHUTE SIZE|
|The following table gives the approximate recommended weight for each size of parachute. The weight is the total weight of the rocket and the weight of the engine AFTER use. A slow rate of descent is generally about 11 to 15 feet/sec. A mid-range is about 18 ft/sec and fast is about 22 ft/sec. As an example, dropping a rocket from about 4 feet will result in a final descent rate of 16.4 ft/sec.. The slower the descent rate, the safer for the rocket, but it may drift far from the launch site. A faster rate will allow the rocket to come down faster but it will impact the ground harder. These are only guidelines. It is always up to the builder to determine the final size for the parachute.|
|12||1 to 3 oz||4 oz||5 to 6 oz|
|15||3 to 5 oz||6 to 7 oz||8 to 10 oz|
|18||4 to 7 oz||8 to10oz||11 to 14oz|
|24||7 to 12 oz||13oz - 1 lb||1 - 1.5lbs|
|30||11 oz to 1 lb||1.5 lbs||2 - 2.5lbs|
|36||1 to 1.5 lbs||2 - 2.5 lbs||3 - 3.5lbs|
|48||2 to 3 lbs||3.5 - 4.5 lbs||4.5-6.5lbs|
|60||3 to 5 lbs||5.5 to 8 lbs||9 to 10 lbs|
The above table is from computations based on Model Rocket - Design and Construction by Timothy S. Van Milligan. The formula, based on metric units, is:
where S is the area of the parachute. g is acceleration (9.81m/s2). m is the mass in gms. p is density of air (1225 g/m3 at sea level). C is the coefficient of drag, estimated at 0.8. V is the descent velocity in m/sec.