moved. Sight down the tube to check for good alignment. (Do not use the double-sided tape enclosed
with the rail guides).
Electronics and the Internal Configuration of the Avionics Bay
The exact configuration of the avionics bay will depend mainly on your particular altimeter. They
come in different sizes and you must follow the manufactures recommendations for installation. IF
YOUR ELECTRONICS CAN ATTACH SAFELY TO THE ENCLOSED MOUNTING BOARD,
THEN FOLLOW THESE GENERAL RECOMMENDATIONS:
Attach the brass tube (or tubes) to the enclosed mounting board using epoxy and some fiberglass cloth.
Attach your altimeter to the mounting board in the manner specified by the manufacturer.
DO THE NEXT STEPS WITHOUT BLACK POWDER CHARGES IN ORDER TO
FAMILIARIZE YOURSELF WITH THE PREPERATION METHOD. USE ONLY BLACK
POWDER OUT IN THE FLYING FIELD WHILE WEARING EYE AND HAND
PROTECTION! BLACK POWDER IS VERY DANGEROUS!
Attach main electric match and charge to the forward (upper) side of the bulkhead assembly. Feed
wires through the 1/8” hole in bulkhead and be sure the wires are at least 12” long. Attach main
recovery cord to eyebolt using quikllink. Then slide the forward bulkhead assembly and charge wires
down the upper airframe until the allthread and wires poke out the aft end of the avionics bay.
Attach the other electric match and charge (for drogue) to the lower end of aft bulkhead and feed the
wires through 1/8” hole. These will eventually feed to the inside of the avionics bay.
Secure both main charge and drogue charge wires to correct attachment points on altimeter. Then slide
altimeter and mounting board assembly onto the allthread in the avionics bay, and secure with nut.
You may need a rod or a length of broom handle down the upper section airframe to keep the upper
bulkhead in place while you’re doing this.
Secure the aft bulkhead onto the avionics bay and tighten. Install recovery system as per previous
instructions. Be sure to attach the booster shockcord to the aft eyebolt using a quiklink.
Additional Notes on Avionics Bay
The avionics bay will need to be vented for pressure equalization. The manufactures recommendations
for altimeter venting supersede our recommendations. However, one method is to drill a 1/2” hole
through the upper bodytube into the avionics bay. This hole allows for pressure equalization, and also
provides a convenient access to switch on and off the altimeter with a small screwdriver. In order to
