Dr. Rocket Inc. is the only manufacturer of the Modular Rocket System (Patent Pend.)

What is the Modular Rocket System?

• It is a rocket design that allows the user to assemble a high altitude rocket that can handle the extreme power that is emitted from the M and N class Aerotech Reloadable rocket motors.
• The assembly of this rocket is similar to that of the Reloadable rocket. It is simply screwed together with set screw used to secure the fin assembly.
• Please refer to the product page for pictures of this product. 

ASSEMBLED ROCKET(MRS)	on the way to the launch pad at Black Rock	Impressive Lift Off

• The completed MRS rocket above consist of:
• M-1419, (It can be assembled with any of the 98mm reloadable motors).
• A fin canister with four fins.
• A double threaded Aft and Forward closure.
• A payload section and a aluminum nose cone.
• The parts with pictures and specs are listed below.

The test flight above was the first flight of the rocket and the first flight of the new N-15360.  The Hardware for this motor is offered only through Reloadable Systems LLC and Dr.Rocket

PARTS LISTING

DOUBLE THREADED AFT AND FORWARD CLOSURES

DOUBLE THREADED AFT CLOSURE	DOUBLE THREADED FORWARD CLOSURE	Top View

• Weight:10 OZ.
• Height: 1.75 in.
• OD 4.25 in.

• Weight:1lb 13OZ
• Height:.4.75 in
• OD 4.125 in

FIN CANISTER AND FINS
Completed lower assembly	Fin Canister Screws on to Aft Closure locking it in place.	Dove Tail Fin Grove
Fin in Grove	Dove tail Groove with set Screw Holes	Bottom View of Fin with indexed set screw holes

The fin canister weighs aprox 2 lbs. 11oz with 4 fins.   Its OD is 4.25 in.  Its ID is several thousands larger than the OD of a 98mm Motor.  Its length is 8 in. tall.  It left handed threads so that tightening of the fin can does not loosen the aft closure of the motor.

The Fins are a clipped Delta config. with its root edge approximately 7.5 in long.   Each fin weighs aprox. 3oz

PAYLOAD SECTION

Payload section is 36 inches long and can be made to any custom length.  It is threaded on one end so as to be secured on the forward closure.  It's weight is 4lbs 14oz.   The only difference between this and a 98mm motor is that the opposite end is not threaded for the application of a nose cone.  Note: the holes drilled into the payload section are for the Altac altimeter which is sold by Black Sky Research.

NOTE:  The weight of the N 15360 casing is 5 lbs. 6oz and is aprox 40 inches long.

NOSE  CONE

Nose Cone is machined from a solid piece of aluminum and is bored out internally.    The nose cone pictured above is a Prototype and weighs 8 lbs.  The production nose cones will weigh less and have a eye bolt assembly section that is treaded into the nose cone itself.

THE MODULAR ROCKET AT LDRS 17

    The MRS was scheduled to be flown on an Aerotech N-2000 P on Friday August 7th 1998.  I decided to put the flight off until Saturday the 8th of August for a chance to demo the new Warp 9 propellant from Aerotech.  I figured that one of the only rockets at LDRS that could hold up to the L-3790 would be the MRS ( as you will see below I was right but not the way I had anticipated).  This propellant is to hot for the current 98mm motor design.  Upon ignition the pressure was so great that it blew the forward closure and payloadsection( which is the bulk head of the MRS)  off the L casing and the fin can.  It proceeded to reach an altitude of   about 60 feet in the air.  The nose cone separated and the payload section came in hard.  It was not damaged but the avionics (ALTACC) was trashed.  The fin Canister held up just fine.  Probably because of the double wall thickness and the double threaded aft closure.  The nozzle was fractured and non existent.   Fortunately I was able to rebuild the portion of the payload section that attaches to forward closure.  That meant we were on again for a second level 3 attempt ( the first being at BALLS pictured below).

    On Saturday we had an high altitude window to 35K AGL from noon to two.  Due to some last minute Level 3 formalities I could not get the rocket on the pad until 2pm.  We held the launch due to some cloud cover.  Unfortunately we waited to long and we lost the window.  We got a second chance at 4pm that same day.   It took a while to clear the range of all persons ahead of the flight line.   We were go for launch.  5-4-3-2-1-0 nothing.  The electrical system was damaged due to the storm the night before.  We hooked up a Black Rock launch system which meant we were closer than the launch line but still with in a safe distance..  Ignition was spectacular and it appeared and felt like we were about 75ft from the rocket.  I used some blue thunder propellant with two electric matches by Fire in the Hole.  There was a burst of flame from the nozzle as the igniter and the propellant burned and then a split second later a huge gush of white smoke and flame erupted from the motor.  The rocket then leaped of the pad in a straight line for the sky.  Unfortunately some overcast haze had moved overhead and the rocket still burning hit the haze.  We lost sight of the rocket at that point and waited for the sound of an in coming ballistic rocket, but it never happened  We assumed that we had a good flight. 

    I offered a reward for the rockets safe return and the next morning it was found under full chutes 2 to 3  miles down range. It was in excellent shape and survived the flight with no damage.  The Altacc was intact and the data is listed below. It was a successful Level 3 attempt.  One of the main concerns about this rocket is that others might try to level 3 with this rocket.  For now this rocket can not be used by other people attempting to level 3 cert.  Due to the simplicity of its design and the ease at which it can be assembled it does not fit with the level of expertise that one must show to be given the privileges that are associated with level 3. 

    The obvious question is then why did I get to level 3 with this rocket.  Simply because it was my design and it did take a lot of work and expertise to make and fly that rocket.  It is how ever a great rocket for those who are level three and are looking to due to some high altitude work.

    We hope to fly this rocket again with our video nose cone.  The video should be a real treat.

THE ALTACC DATA:

C:\PRODATA>produce prodata.data read 8196 bytes from prodata.dat   AltAcc Firmware: AltAcc II - v2.025

Flight Mode: Drogue to Main Mode AltAcc Gain Factor: 3.4431 GHarrys

AltAcc Minus One Gee: 121.1138 GHarrys     AltAcc Zero Gee: 124.5569 GHarrys

AltAcc Plus One Gee: 128.0000 GHarrys

Launch Site Pressure: 199 Orvilles 25.63 in Hg      Launch Site Altitude: 4220 ft

Drogue Fired at Time: 37.87500 sec 29406 ft AGL

Main Fired at Time: 400.06250 sec 606 ft AGL

MSL Pressure Altitude: 28552ft

AGL Pressure Altitude: 29406ft 37.87500 sec

Max Inertial Altitude: 27022ft 37.81250sec

Maximum Velocity: 1747.8ft/sec 5.68750 sec

Maximum Acceleration: 430.18 ftseCA         21.37500 sec, 13.4 G's