LOC Precision Hi-Tech Build Instructions PK-56

Advanced Rocketry Kits and Components

Introduction

Due to the high thrust motors that can be flown in this rocket, epoxy is recommended! Before beginning construction, read over instructions to become familiar with the proper construction steps. Check the Parts List to make sure you have all the parts. TEST FIT ALL PARTS! Light sanding may be necessary to obtain proper fit.

Items You Will Need to Build This Kit

? Glue (Epoxy Recommended)
? Sandpaper
? Masking Tape
✏️? Pencil and Ruler
ड्रिल Drill
? Paint

Parts List

Check your parts before you begin your build!

? Polyethylene Nose Cone
? Slotted Booster
? Payload Section
? 38MM Motor Tube
? 3/16" Tubular Nylon
? LP-28 Parachute
⭕ Centering Rings (3)
? Starter Fire Blanket
?️ 1/4" Launch Lug/Rail Guides
? Laser Cut Fins (3)
?️ Vinyl Decal

Assembly Instructions

STEP 1 - Eye-bolt / Forward Centering Ring Assembly

Lightly sand the outer glassine layer of the motor tube until the shiny surface is removed. Mix a small amount of epoxy and spread it onto the threads of the eye-bolt. Install one of the eye-bolt nuts onto the eye-bolt and thread it all the way down to the eye. Slip one washer onto the eye-bolt, then insert it into the forward centering ring with the laser-drilled hole. Slip the second washer onto the eye-bolt, followed by the remaining nut. Make sure the eye does not exceed the edge of the ring. A test fit into the booster will ensure proper position. Once the eye-bolt position is confirmed, spread the remaining epoxy over the upper and lower nuts and set aside to dry.

Diagram shows an eye-bolt with two nuts and two washers being assembled through a circular centering ring. The eye-bolt's threaded end passes through the ring, secured by nuts and washers on either side. The text indicates the "FWD End" and that the "eye of the ring points forward". The forward centering ring has a hole for the eye-bolt.

STEP 2 - Motor Tube / Centering Rings Assembly

Install the forward centering ring with the eye-bolt 1/4" from one end of the 11" length of the 38mm motor mount tube – this will be the FWD (Forward) end of the assembly. Make sure the eye of the ring is forward! Slide on another centering ring 5" from the other end of the motor tube; this is the MID (Middle) ring. Slide the last ring on and recess it 1/4" as this is the AFT (Rear). You may check spacing by inserting a fin between the MID and AFT rings. Make sure rings are perpendicular (at right angles) to the motor tube. Test fit to ensure rings will not interfere with the fin slots! Once you are sure of the ring placement, epoxy the rings onto the motor tube. Set aside to dry.

Diagram illustrates the 11" motor tube with three centering rings being attached. The forward ring is near one end (FWD End). The middle ring (MID Ring) is positioned 5" from the opposite end (AFT End). The aft ring (AFT Ring) is recessed 1/4" from the very end. A fin is shown being used to check spacing between the MID and AFT rings, ensuring they are perpendicular to the motor tube and do not interfere with fin slots.

Optional Pro Motor Retainer: LOC PRO Motor Retainers are CNC machined aluminum and anodized. Install onto the aft of the motor tube with JB Weld and easily flip motors in the field! Click here for info!

STEP 3 - Shock Cord / Eye-bolt Assembly

Take the tubular nylon shock cord and insert one end into the eye bolt.
Insert the other end of the shock cord through the sewn loop and pull tight around the eye bolt.
Bunch up the shock cord and feed it from the FWD end of the motor tube toward the AFT end of the motor tube. This will keep it clear of the epoxy through the following steps.

Diagrams show the shock cord being threaded through the eye bolt and then bunched up inside the motor tube. Text annotations warn: "Slather epoxy - do not get any epoxy in the motor tube!" and "Shock-cord bunched up inside of motor tube. Do not get epoxy on shock-cord or inside motor tube!". Another diagram shows epoxy being applied to the "BOOSTER AFT End" where it meets the airframe, and to the root edge of a fin before insertion into a fin slot. An "External Epoxy fillet" is also indicated.

STEP 4A - Motor / Booster Airframe Assembly

Slather epoxy up the AFT of the booster tube (the end with fin slots) FWD of the fin slots. Insert the motor mount assembly until the AFT ring is 1/8" recessed. Stand the airframe AFT down to cure. You may always add more epoxy to the FWD ring by drizzling epoxy onto the ring from the FWD end of the booster. DO NOT get any epoxy in the motor tube!

STEP 4B - Motor / Booster Airframe Assembly

Flip the airframe over so the AFT is upright. Apply an epoxy fillet to the intersection where the AFT ring meets the airframe. DO NOT get any epoxy in the motor tube! Allow to cure.

STEP 5 - Booster Airframe / Fin Assembly

Reposition the airframe laying down. Apply a generous bead of epoxy to the root edge of one fin and insert it into the fin slot. Allow to cure before moving onto the next fin. When all fins are epoxied in place, apply an external fillet to each fin to airframe joint.

STEP 6 - Bulkhead Assembly

Install the screw eye in the bulkhead. Epoxy both sides where the screw eye meets the bulkhead. Allow to cure.

Diagram shows a screw eye being installed into a circular bulkhead. Epoxy is applied to both sides of the screw eye where it contacts the bulkhead.

STEP 7 - Bulkhead / Coupler Assembly

Insert the bulkhead into the coupler. Epoxy fillet both sides where the bulkhead meets the coupler. Allow to cure.

Diagram shows a bulkhead being inserted into a coupler tube. Epoxy is applied as a fillet to the joint between the bulkhead and the coupler on both sides.

STEP 8 - Coupler / Payload Assembly

Slather epoxy in one end of the payload section. Insert the coupler 50% (3") into the payload section and allow to cure.

Diagram shows a payload section tube and a coupler tube. Epoxy is applied to one end of the payload section, and the coupler is inserted halfway (3 inches) into it.

Optional Coupler Payload Assembly: You may retain the coupler with screws or plastic rivets. This will leave the possibility of adding an electronics bay in the future. Click for Nylon Rivets | Click for Electronic Bays

STEP 9 - Shock Cord Attachment

Shake or push the shock cord from the motor tube out the FWD end of the booster. Insert the shock cord into the fire-resistant blanket and slide it down. Insert the shock cord 3' through the screw eye. Make a knot. At the end of the shock cord, insert the parachute shroud lines. Then pass the parachute canopy back through the shroud line loops, and pull tight.

Diagrams show the shock cord being fed through the fire-resistant blanket and then through the screw eye on the bulkhead assembly. A knot is made. The parachute shroud lines are attached to the end of the shock cord, and the parachute canopy is threaded through loops and pulled tight.

STEP 10 - Nose Cone Assembly

Friction fit the nose cone to the FWD end of the payload using masking tape. You may also use plastic push rivets or screws. Make sure the cone will NOT come off during ejection or descent.

Diagram shows the nose cone being attached to the payload section. It indicates a "Friction fit with tape" and mentions using plastic rivets or screws for a more secure attachment, ensuring it won't detach during flight.

STEP 11 - Rail Guides / Launch Lugs

Install the rail guides into the booster with provided screws:

Drill a hole smaller than the screw so the screw threads into it, 1½" forward of the aft ring, centered between fin sets.
Drop a small amount of epoxy in the drilled hole.
Thread the rail guide and screw into the hole.
Rotate rocket 180 degrees and let cure.
Repeat for the forward rail guide, 1½" aft of the forward ring.

Optional Install: Some choose to use a wood screw drill/tighten into the aft and forward rings. Your choice! Note: Launch lugs provided if launched from a rod.

Diagram shows a rail guide being installed onto the booster body using a screw and epoxy. It details the placement relative to the aft ring and fin sets.

STEP 12 - Paint / Finish

Spray rocket with primer, sand and repeat until a smooth finish is obtained.
Spray rocket with paint of choice, let dry.
Apply protective clear coat.
Apply vinyl decals to your liking.
Repeat with clear coat.

Preflight

Sim Your Rocket!

This rocket is recommended for high power rocket motors F through H impulse. Depending on your flying field and finished weight, this is a very versatile kit. The Rocksim® file is available on the 2.6" HI-TECH product page on the LOC Precision website. Always check stability to ensure stable flight; the Center of Gravity (CG) must be forward of the Center of Pressure (CP) in flight-ready condition.

Diagram shows a side profile of the rocket with the Center of Pressure (CP) indicated at "41.5" +/- .5".

Hi-Tech Specs

Height: 49.75"
Weight: 20 oz.*
Diameter: 2.630"

* Be sure to weigh your rocket! Your build may be above or below the specified weight. The actual weight must be entered into the sim software to get correct flight statistics.

Motor Suggestions

F50-6*
F55-6*
G40-7*
G80-7*
H97-10*
H128-M*
H45-10
H123-M

*29mm motors to be used with 29mm MMA-2 Motor Adapter

Model Rocket Safety Code

Adherence to the following safety code is essential for safe model rocket operations:

Materials: I will use only lightweight, non-metal parts for the nose, body, and fins of my rocket.
Motors: I will use only certified, commercially made model rocket motors, and will not tamper with these motors or use them for any purposes except those recommended by the manufacturer.
Ignition System: I will launch my rockets with an electrical launch system and electrical motor igniters. My launch system will have a safety interlock in series with the launch switch, and will use a launch switch that returns to the "off" position when released.
Misfires: If my rocket does not launch when I press the button of my electrical launch system, I will remove the launcher's safety interlock or disconnect its battery, and will wait 60 seconds after the last launch attempt before allowing anyone to approach the rocket.
Launch Safety: I will use a countdown before launch, and will ensure that everyone is paying attention and is a safe distance of at least 15 feet away when I launch rockets with D motors or smaller, and 30 feet when I launch larger rockets. If I am uncertain about the safety or stability of an untested rocket, I will check the stability before flight and will fly it only after warning spectators and clearing them away to a safe distance. When conducting a simultaneous launch of more than ten rockets, I will observe a safe distance of 1.5 times the maximum expected altitude of any launched rocket.
Launcher: I will launch my rocket from a launch rod, tower, or rail that is pointed to within 30 degrees of the vertical to ensure that the rocket flies nearly straight up, and I will use a blast deflector to prevent the motor's exhaust from hitting the ground. To prevent accidental eye injury, I will place launchers so that the end of the launch rod is above eye level or will cap the end of the rod when it is not in use.
Size: My model rocket will not weigh more than 1,500 grams (53 ounces) at liftoff and will not contain more than 125 grams (4.4 ounces) of propellant or 320 N-sec (71.9 pound-seconds) of total impulse.
Flight Safety: I will not launch my rocket at targets, into clouds, or near airplanes, and will not put any flammable or explosive payload in my rocket.
Launch Site: I will launch my rocket outdoors, in an open area at least as large as shown in the accompanying table, and in safe weather conditions with wind speeds no greater than 20 miles per hour. I will ensure that there is no dry grass close to the launch pad, and that the launch site does not present risk of grass fires.
Recovery System: I will use a recovery system such as a streamer or parachute in my rocket so that it returns safely and undamaged and can be flown again, and I will use only flame-resistant or fireproof recovery system wadding in my rocket.
Recovery Safety: I will not attempt to recover my rocket from power lines, tall trees, or other dangerous places.

Launch Site Dimensions

Installed Total Impulse (N-sec)	Equivalent Motor Type	Minimum Site Dimensions (Ft.)
0.00 – 1.25	1/4A, 1/2A	50'
1.26 – 2.50	A	100'
2.51 – 5.00	B	200'
5.01 – 10.00	C	400'
10.01 – 20.00	D	500'
20.01 – 40.00	E	1,000'
40.01 – 80.00	F	1,000'
80.01 – 160.00	G	1,000'
160.01 – 320.00	Two G's	1,500'

Schools, Clubs and Other Groups

LOC Precision Multi-Packs are available for this and other LOC Precision Rocket kits. Call or email us for multi-pack pricing.

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