SMT Deigns Modular Electronics Bay

Assembly Instructions.

Image 1: Fully Assembled Bay.

Description: The SMT fully modular electronics bay is designed specifically for Mach1 Rocketry’s BT 60 tubing coupler. It can be configured to take a number of altimeters. *(See altimeter list below) It can also be configured to use either a 9v battery or a 2S 300mAh 7.4 v LiPo battery. All parts are interchangeable and can be purchased separately should a part become damaged. All screws, hardware, switch, wiring, and wiring connectors are present, so all that will be needed to complete the bay is a battery and an altimeter.

Altimeter List: Missile Works RRC2 and RRC2+…Stratologger CF…Easy Mini…Egg Timer Quark

The Kit: The kit has the following parts. The Main Sled. A forward Bay Cap (The larger one). A Rear Bay Cap. 2 Charge well assemblies. A battery assembly. A mount for your choice of Altimeter. 2 Rods. Wiring packet. All Screws, Washers Connectors, and Shrink Wrap.

Step 1. First determine top and bottom of the sled. For our purposes we will call the bottom of the sled to be the side with “M1” etched in center Left of the sled. While holding it in this position, the end facing up is forward, and the lower part of the photo is aft. The Altimeter is at the forward end, and the Battery is aft. Note: Both parts insert through the bottom (the side with M1).

Locate the switch: Notes about this switch. This switch is a momentary switch that will be engaged by turning a screw through the top of the forward electronics bay cap. In the photo the left and center prong will be the switch attachment.

The Forward cap accepts the switch as shown. Note the is a slot on the left opposite the prongs and bottom that accepts a tab from the switch.

The screw goes in the top.

Locate one of the short screws and a star washer to attach the switch.

Screw the switch into place.

Next get your altimeter mount. You will need four long screws and star washers along with two short screws and star washers.

Note: The four long screws are to attach your altimeter. The two short screws attach the altimeter mount to the sled.

Place the four long screws in a shown for safe keeping until you mount you altimeter.

Lay the Sled bottom up (M1 Showing) and place the Altimeter mount as shown. Use the two short screws and star washers to attach.

Note the forward Electronics bay cap is sitting at the forward end in the correct position.

Find the bag with your battery holder. In this demo we are using a 9v housing, but they all mount the same.

Insert the larger battery carriage into the bottom as shown. Use 2 short screws and star washers to attach.

Flip the unit over. The Battery inserts as shown. Note the cover is sitting in the correct position with the slot Aft and left to allow for the wires to pass through.

Sled is complete. Now onto the end caps and rails.

To Begin assembly on the aft electronics bay cap, locate the parts shown in the photo. The small cap with M1, 2- medium screws, 2 - connectors, 2- brass washers, 2 - standard nuts, and 2- barrel nuts.

Note the Nuts are designed to fit into the hex holes

In the end of the sled.

Put a brass screw then a connector on one the provided screws and screw through the fitted nut as shown. Do the same for the other side.

Notice the positioning for the connectors. This positioning is important. You will take this off later to solder your aft event wires permanently, but we wanted to note the position.

Next put on the end cap as shown.

It should look like the Photo (left)

Find the 2-barrel nuts and star washers to attach. This will be your e match connection point.

Aft Cap as shown.

Next, we go on the forward cap. Find the 2- really long screws, 2 Brass washer, 2 nuts, and 2 connectors. You will do that as you just did with aft cap.

Insert the nut into the hex hole and screw the long screw through with the brass washer and the wire connector. Again, note

the position of the connector.

Forward attachment screws finished as shown.

Note the position of the connectors.

Insert as shown.

Again, The barrel nuts are your connectors for your forward e-match.

Attach as shown.

Insert the rods through the sled assembly, through the remaining holes and carefully guide through the sled.

Find your charge cannister assembly and Kevlar. Thread the Kevlar through the inner holes as shown. There is a slot in the rear of the cannister for the Kevlar to rest in.

Kevlar attachment. Do this for both charge well assemblies.

Find the 4- nuts with built-in star washers, and four standard washers to attach both charge well assemblies.

Forward charge well assembly complete. Now do the aft.

Wiring has been provided for any configuration of any battery/altimeter combination.

Please check with your altimeter manufacturer for wiring schematics and diagrams.

Notes about the arming screw. As said before the switch is a momentary switch that has to be engaged. The arming screw will screw through the rocket body and push down on the switch to engage it. It will also be flush with the airframe at the same time.

Mach1 Rocketry tubing is cut to 7” to accommodate this bay perfectly. The air sampling hole should be drilled through the airframe and the coupler per the manufacturer’s specifications.

Below Arming screw disengaged

Thank you for purchasing the new BT60 38mm from SMT Designs and Mach 1 Rocketry.