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PML Electronics

PML offers these CPR-compatible electronic accessories at great prices! If you want to fly high altitude rockets in a small field, you'll need them!

What is CPR? CPR is an altimeter based, two step parachute deployment system incorporated into our latest line of high altitude rocket kits. Using an altimeter, a small drogue chute is deployed at apogee allowing for a fast decent. At a user-selectable altitude, the altimeter fires a second charge, deploying the main chute allowing for a soft landing. The altimeter is centrally located in a special compartment within the main airframe. The drogue chute is ejected from a split-point in the airframe just above the fin/motor section while the main is ejected at the nose cone. Both chutes are deployed using our exclusive Piston Ejection System. Click the CPR System button in the web store for more details.

DEPLOYMENT IGNITER SELECTION
Electric matches or igniters have a higher degree of reliability due to their more consistent current requirements. The altimeters and staging timers that PML offers can be used with most low-current igniters, including flashbulbs. The resistance reading of what you intend to use is important.

Here's why:

E = I x R, where E is Voltage, I is Amperage, and R is resistance. We know the Voltage involved depending on the onboard battery. We also know from the specifications of the unit that the ignition device must fire with a certain amperage range. So, we need to find R, the Resistance, to determine which ignition device can work successfully with the device we intend to use.

EXAMPLE:

Co-Pilot Altimeter
Battery = 9 volts
Current = 1.25 amps

E = I x R, 9 = 1.25 x R; rearranging, we get R = 9/1.25 or 7.2 ohms. Your ignition device must be 7.2 ohms or less to work properly with the Co-Pilot using a 9v. alkaline battery.

Igniter manufacturers will specify the electrical usability (ohms & volts) range for their devices; contact the igniter manufacturer for their specifications. We strongly recommend that you check each igniter you intend to use before flight to determine that it is good and within the ohm range needed. We also strongly recommend that you ground-test the electronic device you intend to use with the ignition device you intend to use before committing that combination for use in an actual flight. Ground testing instructions are included in our detailed instruction package provided with each of the Electronic Deployment Devices we sell.

Order # Description Price
COPILOT


PML Co-Pilot Altimeter

The Public Missiles Ltd. Co-Pilot altimeter was developed exclusively for Public Missiles Ltd. by Missile Works Corp., and was designed specifically for PML’s CPR3000 Recovery System (though it can also be used in other applications as well, such as scratch-built deployment systems). The Co-Pilot provides two-stage barometrically-controlled (pressure-sensing) deployment of rocket recovery systems and equipment. Using the Co-Pilot altimeter and CPR3000 technology, a small drogue or streamer is deployed at apogee allowing for a fast but controlled descent. At a user-selectable lower altitude (200, 400, 600, or 800 ft. AGL), the altimeter fires a second charge to deploy the main chute, allowing for a soft landing. This system allows a high-altitude flight to be returned much closer to the launch area than if the main chute were deployed at apogee.
Shown with CPR-3000 mountings and charges attached.

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Developed specifically for the CPR-3000 Close Proximity Recovery System. Very rugged and reliable design and construction. Clearly marked terminals to help prevent mis-wiring of charges. User selectable main chute deployment altitude. Built in Mach delay timer with user-selectable delay times. Continuity checking and reporting via beeper for both apogee and main charges
Ground-test mode fires charges WITHOUT needing to apply vacuum Produced exclusively for Public Missiles Ltd. by Missile Works Corp. Audible peak altitude readout
Uses standard 9-volt alkaline battery Positive battery retention to prevent disconnection of battery in flight
Operational Range:
0-25000 ft. MSL Arming Mode Barometric
Minimum Altitude for Arming 300 ft. AGL
Main Deployment Ranges 800, 600, 400 or 200 ft. AGL
Altitude Reporting Accuracy ± 3% (for flights at least 3k AGL; ± 5% for low flights up to ~2k AGL)
Battery Onboard 9V alkaline
Nominal Battery Load 15ma
Test Current 80 ma
Firing Current 1.25 amps for 1 sec.
Dimensions 1.38" W x 5.0" L x ~0.8” H Weight 3.4 oz. w/battery

 $155.95
STAGING TIMER
 
PML AccuFire Staging Timer

Introducing the PML AccuFire Staging timer. This state-of-the-art timer has been developed by G-Wiz Partners exclusively for Public Missiles Ltd. The AccuFire was especially designed for use with the PML Inter-Stage 3000 system used with all of PML`s 2 stage rocket kits. The AccuFire can also be used in scratch-built staging, air start, and deployment systems. PML and G-Wiz spent many months designing and testing the AccuFire to make sure it would be the safest, most reliable, and easiest to use timer on the market. Take a look at the specs and features:

 

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Features:
  • Uses an on-board, standard 9VDC alkaline battery.
  • Provides up to 1.25A output current to the pyro channel.
  • Over 5-hour battery life.
  • 15 selectable delay times with audible time beeper. Time adjustable through DIP switches.
  • Delay Times: 0s, 0.5s, 1s, 2s, 3s, 4s, 5s, 6s, 7s, 8s, 9s, 10s, 15s, 20s, 25s.
  • Continuous, audible continuity verification.
  • Easily fits inside PML PT-1.525 (38mm) airframe tubing.
  • 4.0" L x 1.4" W x 1.0" H
  • Weight approx. 2.8 oz./77 grams with battery.
  • UL recognized positive retention wire gripping terminals, AWG 14-30 gauge wire.
  • Especially designed for our Interstage 3000 system (The Interstage 3000 system is also used in PML`s two-stage rocket kits: Thunder `n` Lightning, Quantum Leap 3000, and MiniBBX w/Terrier Booster)
  • Can be used in scratch-built systems too. IS-3000-FTM and IS-3000-ATM mounts (available below and on Staging page) allow for use in any 38mm altimeter bay.
  • Bench test mode to verify operation of the timer and to test the pyro circuit with your desired ignition device.
  • Safe and easy to use*.
  • Complete and in-depth instruction manual
  • Warranty 180 days, through G-Wiz Partners.

 

 $101.95

 

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