Introduction
Rocket plans
Technical Section (Electronics Bay)
Chutes deployment
Photos
Email with Mike Denett from Cesaroni
Thrust curve of L970 (2800-300-M) & predictions for the M960 (2800-300-MFX)
Description of the Hypertek M motor system
More specifications for the Hypertek M 960
Thurst curve of the 2800-300-M based on the data provided by Cesaroni.
Thrust curve of the 2800-300-M boost at 1% for 2800-300-MFX converted to a standard thrust curve table for simulation purposes.
Simulation on Rocksim with motor specs entered manually
Graph of the flight
Plan used on rocksim for simulation
Pre-launch check-list
Post-recovery check-list 

The Circus4 is a heavily modified LOC Minie-Magg stretched to 110 ½ inches long, with three LOC Magnum fins. The fins are through-the-wall / through-the-motor mount with PVC ¾ inch molding used as reinforcements along the fin roots to provide more surface area where the structural strength isn't provided by Epoxy alone. The booster section is designed to accept an M1010 Armageddon motor from Hypertek. The Booster is reinforced with 6 centering rings which are joined together using wooden rods that are glued together using epoxy throughout the assembly. The rods and rings are all in contact and glued to the fuselage forming a uniform whole. In addition, three threaded 50 inch long metal rods were added before the final build to add strength to the motor mount assembly.

This rocket was NOT reinforced with fiberglass due to it's heavy-duty construction using internal reinforcements instead of external reinforcements. The rocket is covered with Hammerite paint mixed with fiberglass to give it some extra external strenght, but this was done mainly to make the overall rocket more resistant to the usual wear & tear. The rocket has flown successfully on a Hypertek L550 and landed safely on asphalt tarmac without a scratch

Some of my notable level 3 experience

PML Black Brant X, Flown with an Aerotech J motor
Illudium Pu35 Space Modulator, 6 inch diam x 66 inch rocket flown on a Hypertek K hybrid motor
Bowling Ball Lofter, Flown with an Aerotech K motor
Circus3, Flown with a Hypertek L motor (Hybrid)

The motor I will use is a Hybrid Hypertek M960 which is recognized and tested by Tripoli but who'se technical specifications haven't been annonced yet. I have contacted Cesaroni to obtain more details about the motor. The power of the motor is 5126 N/s which is 6 N/s more than the absolute minimum required for an M motor so this is clearly a baby M. The launch site for the Mountainview launch will be sufficient for this motor.

Electronics

The rocket will be flown using two Olsen FCP-M2 altimeters with independant power sources. Each altimeter will fire independant ejection charges. They are mounted in a 10 inch long standard electronics bay reinforced with two threaded rods for extra strength.

Parachutes

The rocket will be flown with dual stage deployment using a 36'' drogue at apogee and two main 60 inch chutes fired at 1000 feet (800 feet for the backup altimeter).

Flight Profile

Max Altitude : 2.29 Km AGL (2290 meters).
Max Velocity : 768 km/hr.
Rod Velocity : 100 Km/h at the end of the ramp .5 sec including the oxygen burst.
Max Acceleration : 67 m/sec2 (6.7 G's roughly)
Flight duration : 120 seconds

1- Program the Olsen Altimeters (see settings at bottom).
2- Set the altimeters to the OFF position, switch safety keys to OFF position.
3- Put in 1.5g of black powder in each LES tube.
4- Connect the wires of the switches and the flash bulbs
5- Bolt the technical bay closed
6- Secure the chutes, nomex pouches and nomex sleeves to the technical bay.
7- Screw the airframes of the upper technical section that contains the main chute.
8- Check and secure the chutes on the nose and on the booster
9- Assemble the booster and the nose, put 3 shearpins 1/16" on the nosecone
10- Change the four "O" rings on the motor
11- Check the overflow tube
12- Screw the motor on the booster
13- Approach the ramp
14- Set the switch of the launch system to the off position
15- Check the solidity of the ramp
16- Check the solidity of the launch lugs
17- Attach a new igniter wire on the rod and insert the rod (hybrid motor injector rod)
18- Check the connection between the motor and the injector rod
19- Attach the motor and the injector rod with two tiewraps
20- Check the connections of the hoses for the nitrous oxide and the oxygen tanks
21- Put the launch system switch to the ON position
22- Check electrical connections, test the solenoids, and coil with back-up igniter
23- Connect the ignition
24- Open the manual valves of nitrous oxide and the oxygen
25- Adjust the pressure of the oxygen to 50 PSI
26- Check the weather and wind and ajust the final launch angle of the launcher
27- Put the two safety switches of the altimeters to the ON position
28- Double check the launch lugs and the ramp
29- At a distance predetermined by the RSO, fill the Nitrous tank
30- When vapor comes out the overlow, start the coutdown and launch

In case of misfire

1- Dump the gas in the motor tank
2- Approach the rocket
3- Set the launch system to the OFF position
4- Turn the altimeter safeties to the OFF position
5- Restart from 17 and add 10, 11 and 12 in case of another misfire.

Olsen Altimeter Settings

MASTER Main Altitude : 1000' Mach Delay : 0 sec Altitude Change Launch Detect: ON Record: ON Apogee Delay: OFF

BACK-UP Main Altitude : 800' Mach Delay : 0 sec Altitude Change Launch Detect: ON Record: ON Apogee Delay: ON

Post-recovery checklist

1- Check the surrounding area if there is no danger (fire, electrical wire etc..)
2- Approach the rocket sideways
3- Open the technical bay
4- Read the altimeters and set them to the OFF position
5- Disconnet the flashbulbs and connect their two wires together
6- Make a list of the dammage on the rocket
7- Pick up all the pieces and return to base

Post-recovery in case of failure

1- Dump the nitrous oxide gas
2- Approach the ramp
3- Put the switch of the launch system to the OFF position.
4- Put the switches of the altimeters to the OFF position.
5- Disconnect the battery of the launch system
6- Disconnect all the wires and tubes
7- Remove the rocket off of the ramp
8- Open the technical (electronics) bay
9- Disconnect the flash bulbs and connect their wires together
10- Pick-up all the pieces and return to base