Adept Rocketry DDCS25

Dual Deployment Controller™

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DDSC25, Price: $79.00 - Includes CAB6L-24 Interconnect Cable and GP-23A Battery.

DDCS25-100K, Price: $99.00 - Includes CAB6L-24 Interconnect Cable and GP-23A Battery.

The DDCS25 Dual Deployment Controller™ is based on the ALTS25 Maximum Altitude Altimeter with Dual Deployment™. It is the same as the ALTS25 in all its functions except that it does not report altitude. It is less precisely calibrated than the ALTS25 and is therefore lower in price. One of its primary uses is as a redundant backup for the ALTS25 (they both fly in the same vehicle). Or the DDCS25 may be used as a primary device to control Dual Deployment™ in a flight when the actual altitude attained is not important. The DDCS25 has two altitude controlled deployment switches that are typically used to fire deployment charges, based on altitude. The first charge fires when the rocket reaches its maximum altitude (apogee), and the second charge fires when the rocket descends to 1800, 1200, 900, 600, or 300 feet above ground, or two seconds after apogee, or at 150 feet below apogee (user selectable). One common usage is to deploy a main parachute at apogee by using only the first output. However, the most typical usage is to deploy a drogue chute or streamer first, then to deploy a main parachute when the rocket descends to a user selected altitude above ground (Dual Deployment™), in order to avoid significant drifting due to wind.

This device is used in rockets that will reach at least 300 feet altitude. Either or both deployment switches may be used. The DDCS25 may be used in any rocket configuration including multistage rockets, in which case the deployment control for a particular stage can be handled by placing the device in the particular stage of interest. Or individual DDCS25 units (or other altimeter devices) may be placed in each stage of interest to handle deployment for each stage. The DDCS25 functions to a maximum of 60,000 feet above sea level. The DDCS25-100K is an extended version that functions to 100,000 feet.

The DDCS25 measures 1.4” wide by .6” thick by 3” long. It fits inside a tube with a minimum ID of 1.5” (38 mm). It will also fit on either side of a center divider inside a 54 mm ID bay 3” long. The device weighs only 1 ounce, including the battery. It uses a 12-volt alkaline lighter battery with a battery life up to 6 hours, so you need not be concerned about how long your rocket sits on the launchpad after the unit is powered up. The DDCS25 is a totally stand-alone device including the battery holder, arming mechanism, and current source for firing deployment charges. Nothing more is required except for the wires (interconnect cable) that connect to the On-Off switch and to the deployment charges.

The altimeter device uses a custom absolute pressure device to precisely measure altitude values up to 60,000 feet in one-foot increments. It uses a 16-bit logarithmic analog-to-digital converter to precisely (one-foot resolution) measure the nonlinear pressure versus altitude relationship over this large altitude range. Once powered up, the DDCS25 reports that neither, or one or both deployment charges has continuity. It also constantly measures the ground-level altitude and waits for a quick 300-foot change upward. The first deployment switch fires at the very moment when the rocket reaches the maximum altitude. The second switch fires when the descending altitude reaches either 1800, 1200, 900, 600, or 300 feet above the ground, (or two seconds after apogee, or 150 feet below apogee) as preset by the user.

SPECIFICATIONS

  • Altitude Capability: to 60,000 feet Above Ground Level (AGL), to limit of 60,000 feet Above Sea Level (ASL). The DDCS25-100K functions to 100,000 feet.
  • Lowest Maximum Altitude Required: 300 feet above ground. Liftoff is detected when the altitude quickly increases by 300 feet.
  • Mach Compatible; the DDCS25 uses Adept's proprietary Real Time Dynamic Lockout™ system that tracks speed in real time to ignore pressure glitches that occur when transitioning through the sound barrier, both in and out. This system is possible due to the extreme precision of one-foot resolution measurements.
  • Resolution of Measurement: one foot; system uses a logarithmic 17-bit A-to-D converter.
  • Accuracy Over Full Range: +/- 10%, typical. Altitude is not reported.
  • Uses 12-volt lighter battery and has large integral capacitor to fire flashbulb or low-current electric match charges.
  • Battery Life: up to 6 hours.
  • Piezo beeper reports operational status including the continuity of the deployment devices. One repeating beep if neither device has continuity, two beeps repeating if only device #1 has continuity, three beeps if only device #2 has continuity, and four beeps if both devices have continuity.
  • Switch #1 fires when the altitude reaches maximum; Switch #2 fires during descent at 1800, 1200, 900, 600, or 300 feet above ground, or two seconds after apogee, or at 150 feet below apogee as selected by the user, or 2 seconds after Switch #1, whichever occurs last.
  • Measures 1.4” wide by .6” thick by 3” long and fits inside a tube with a minimum ID of 1.5” (38 mm), or on either side of a center plate inside a 54 mm ID tube. Also, it may be mounted flat against a bulkhead in larger diameter tubes.
  • Weighs only 1 ounce with battery installed.
  • Accessories Required: one 12-volt alkaline lighter battery, and one cable (Adept CAB6L-xx series) to connect an On-Off switch and deployment charges.

ADDITIONAL ACCESSORIES

Additional CAB6L-24 Interconnect Cable
Price: $7.50 - 24 inches long. Connects DDCS25 to On-Off Switch and to Deployment Charges.
CAB6L-12 Interconnect Cable
Price: $5.99 - 12 inches long.
CAB6L-36 Interconnect Cable
Price: $8.79 - 36 inches long.

Additional GP-23A Alkaline Lighter Battery; Price: $2.25.

GP-23A50 Alkaline Lighter Batteries (box of 50 at 50% Discount); Price: $56.25.

Shorting Jumpers are used to connect two connecter pins together in order to turn on the power for some of the Adept devices. Shorting Jumpers are also used on some devices to program certain values or functions. They are used on the DDCS25 to program the value for the Second Output Function, the output that fires the Deployment Charge for the Main Parachute.

Shorting Jumpers
Price: $1.39 per pack of 10.

VCK2 Vacuum Chamber, Complete with Bottle.
Price: $16.79 - Use for simulating flights, and for testing Altimeters with or without deployment.

Electronic Instrumentation is not compatible with the fumes and residue created by rocket motors and deployment charges. Seal holes and gaps in bulkheads and such with epoxy or removable putty.

Tac'N Stik Removable and Reusable Putty
Price: $1.99 per 2 ounce pack.

The perfect mate for the DDCS25 when used in a dual redundancy backup system is the ALTS25. The ALTS25 would function as the primary device to measure altitude and to control Dual Deployment™. The DDCS25 would function as the redundant backup device to also control Dual Deployment™. The ALTS25 measures altitude to 25,000 feet with deployment that functions to 60,000 feet. The ALTS25-60K extended version measures altitude to 60,000 feet with deployment that functions to 100,000 feet.

ALTS25 Maximum Altitude Altimeter with Dual Deployment™
Price: $99.00 - Includes CAB6L-24 Interconnect Cable and GP-23A Battery.

ALTS25-60K Maximum Altitude Altimeter with Dual Deployment™
Price: $134.00 - Includes CAB6L-24 Interconnect Cable and GP-23A Battery.

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www.adeptrocketry.com, 9/12/11