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Updated: Jan 9

Model Rocketry is a fun and safe family activity.

model rocketry is a science your results may vary depending on how you build the rocket. please read the National Association of Rocketry model rocketry safety code and the model rocket handbook.

My Instructions are meant as a guide and are not a guarantee of stability or function of the product.

This rocket has been tested and proven but your results may be different.

depending on your skills.

Launching rockets can be dangerous and requires adult supervision. you use our products at your own risk. OLLIE-OOP Model Rocketry is not responsible for any damages or injuries incurred from use or misuse of our products. you are responsible for the Contruction and stability of your rocket. please follow all safety codes and launch procedures as stated by the NAR handbook.

our kits are not intended to be modified. Please use the recommended engines.

Always follow the NAR safety code at

Read all steps before beginning. Always dry fit the parts on every step that requires glue. And always add a reinforcing bead of glue to all joints the required glue and wipe off excess glue with your finger. Unless stated otherwise.

Always wear safety glasses and mask when cutting with a knife, saw, drill, rotary tool or when sanding or using powder.

These instructions are for all 6 sizes of the X-15 kits. If you want printed instructions please message me and i will include them.

13mm Mount Instructions

For the

BT60 and


BT20 versions.

Mark motor tube at 1/2" from both ends. At 1/4" from either end, cut a 1/8" slit for the hook.
Place hook in the slit and wrap masking tape around it and the tube in the center of the tube between the marks, don't cover them.
Glue thrust ring into FWD end and push it until it stops on the hook.
Locate the yellow cord and rings. Tie one end of the cord to the body tube using a strong knot, put a drop of white glue on the knot. Glue each ring flush with each end of the tube and at the same time slide cord through notch in FWD ring and pull all of it through then feed in down and out the AFT end of the motor tube. Put reinforcing glue on both sides of each ring /tube joint.

18mm Mount Instructions

Make a small slit 1/4" from the end of the tube. Place the small end of the hook in the slit and wrap tape around the center of the tube and hook.
Tie one end of the yellow cord around the tube and put a drop of glue on the knot.
Make several marks going around the tube at 1/2" from both ends. Put a line of glue around the tube just beside both marks.
On the FWD end of the tube near the slit, slide a ring on the tube, through the glue and up to the set of marks. Use the marks you made around the tube to make sure the rings are straight. Feed the yellow cord through the hole in the FWD ring.
Slide the other ring on the other end of the tube up to the marks. Add reinforcing bead of glue to each joint of both rings.
Put a line of glue in the AFT end next to the slit and hook. Push in the thrust ring until it stops on the hook. Add a extra glue to FWD the joint. Let dry.

The 35mm tube kit has multiple motor options and depending on your choice of motor it both, does and does not require nose weight. Follow the Instructions, message me for help.

Do diligent testing. If you deviate from the instructions, you do so at your own risk.

the mount is a standard 18mm
The 35mm body tube kit will fly on an Estes A8 without nose weight.

It does require the nose weight that's included for the recommended motors. Estes B4, B6, C6

BT-80 Kit motor mount instructions.  E and D MOUNT INSTRUCTIONS

For Pictures and instructions on the motor mount for the BT-80 kit. see the bottom of the page.

Locate fins and sand them. Take note in the instructions on how the wing is assembled and do not round the areas that glue together. You may round the leading and trailing edges after the glue dries too.

Use wax paper and lay out the fins. Place glue in the areas shown and assemble the wing. Make sure it's on a flat surface and use a ruler to keep them straight. let dry. (See Diagram and pictures)

NOTE: The smaller of the 2 fins is used in the wing assembly, the other larger 2 are the tail fins.

All sizes of my X15s are constructed in the same way. With exceptions to the motor mounts.

On a flat surface, use ruler to keep them even.

Some kits may have different fin marking guides.
If it's a wrap guide, cut out the guide and wrap it around the tube and tape it in place.
if it's a flat guide, stand the tube on the guide and center it on the proper circle and mark each location on the tube, being careful not to move it.
Using a door frame. Extend 2 lines that are opposite of each other the entire length of the tube and the other 2 a few inches.

Engine mount Instructions....

On the BT60 kit the mount tube is inserted around 1/4" farther inside the body tube, rather that flush with it. Instead of stopping when both tubes are even, continue to push until the motor mount tube end is 1/" in the body tube.
You can find the original instructions online for free. Just search Estes X-15 #0889 Instructions

When mount is dry. Feed cord down mount and out the AFT end.

Place a line of glue around the inside of the AFT end of the body tube, about 2" in. A lot less if it's a smaller kit. Measure your mount and place the glue in the body tube in the proper location. About 1" less that the length of the mount, so that when you push it in it passes through the glue.

Insert mount, stop about 1" in and very quickly add another line of glue around the inside of the body tube, just at the end.

Push mount without stopping until both tubes are even, note the hook placement during this process. Add a line of glue to the AFT ring and tube joint, wipe off extra with finger. Let fully dry 24Hrs.

Place glue along the root of a wing assembly and attach it on one of the long lines. Hold it in place until it stays firmly attached. Make sure it stays projected straight out from the tube. They should be the same length as the body tube.

(See diagram)

Do not set it down on a wing until its firmly dry for several minutes.

Once the wing is dry, repeat the same on the other wing.

Wings must be attached correctly for stable flight.

Apply a reinforcing bead of glue to each wing tube joint on both sides of each wing and wipe off excess with your finger. USE TITEBOND QUICK AND THICK OR EPOXY FOR BEST RESULTS. YOU CAN ALSO APPLY 2 OR 3 FILLETS FOR EXTRA STRENGTH. ALLOW EACH ONE TO DRY FIRST.

Locate shrouds. Make sure that when you fold that the shiny side will be up when attached to the body tube.
Lay them shiny side down. With a ruler and the backside of the tip of your hobby knife, score a line along the tab. Fold tab over. (See picture)
Place glue along the tab and around the edge of the shroud. Attach it to the wing and tube. Start at the tip and align it along the edge in the fins. Make sure they are straight, depending on the version your building, the launch lug will be placed along one of the shrouds.
They should be as long as the wing.

Locate the tail fins and glue them at the lines on the tube same as the wings. One at a time, keep them perfectly straight. Once dry apply reinforcing glue to each joint. (See diagram)


For the BT60 kit 3" from AFT

MMX kit - flush with AFT end against a fin

BT20 kit - flush with AFT end against a fin

BT50 kit - 1.5" from AFT to 2.5" against a shroud

35mm kit - 1.5" from AFT to 3" against a shroud

BT80 - kit 1 flush with AFT end and 1 at 7 3/4"

Lightly sand the launch lug and glue it against the edge of one of the shrouds or tailfins from the AFT end. Make sure it's perfectly straight with the tube. After its dry ad reinforcing glue to each side of it wipe excess with finger.

Trim and sand the nose cone. It's made of PLA plastic. There are many ways to fill the lines in the cone, from CA glue to Tamya putty. I simply sanded mine and added 2 coats of primer and 2 or 3 coats of paint. The person that made them for me is very good at it so they paint and finish nicely. Thanks again Frank!

NO nose weight is required for the kits listed below. When using the recommended motors.

Micromaxx kit.

The original BT60 kit

BT-80 kit.

The 35mm kit will fly on A8 without nose weight.

The Bt50 kit will fly 200ft or so on an Estes 13mm 1/2 A without nose weight.

Any larger motors require nose weight.

BT-20 KIT Requires 2.1 grams of nose weight.

BT-50 KIT Requires 7 grams of nose weight.

35mm KIT Requires 7.5 grams of nose weight.

Nose Cone Caps.

Use CA or epoxy to attach nose cone base caps. Screw in eye screw and remove it, place CA or epoxy on the threads and screw it back in.


Recommended motors...

The MMX kit uses Quest Micromaxx motors.

The BT20 kit uses Estes 13mm 1/4 As and 1/2 As

The BT50 kit uses Estes 13mm A3s, A10s

The 35mm kit uses Estes 18mm B4, B6, C6

The BT60 kit uses Estes 13mm A10-3T (the original kit clone)

The BT80 kit uses Estes 24mm D12-3, E12-4

(Use the white or red spacer tube with the D motors.)

BT-80 Kit motor mount instructions. E and D MOUNT INSTRUCTIONS seen below.

Locate the retainer ring and threads. Place the threads on an end of the tube and mark a ring around the tube with a pencil. Locate a paper ring. Place glue inside an end of the tube and insert ring flush with end of the tube. Stand on flat surface.

Glue the FWD ring at the very end of the tube as well as the thrust ring inside the tube.

Glue the other ring just FWD of your pencil marks. The AFT ring will sit flush with the body tube.

Add a reinforcing bead of glue on all joints and wipe off excess with finger.

Tie one end of Kevlar cord around the motor tube and feed it through the hole in the FDW ring and down the tube out the AFT end. That keeps it out of the way for installation.

Retainer Instructions. Sand the inside of the threaded ring.

Use epoxy to attach it to the AFT end of the mount tube.

You should install the retainer last.



Let me know as soon as possible if you encounter any issues or mistakes or have any questions. YOU BUILD AND FLY OUR KITS AT YOUR OWN RISK.


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