Latin Translates to:
The Sonic Locator is constructed from a Radio Shack personal alarm system,
number 49-417, at a cost of about $10.00. Other R/S items are 1
submini phone jack 3/32" or 2.5mm in size, part number 274-292A,
at a cost of about $1.25, and a 9volt long life Nickel metal hydride
rechargeable, with an output of 150 mAh, part number 23-526. If
you wish, you can add a cds cell in lieu of phone jack to complete the circuit
when the locator is exposed to a light source. Other
items are Plastruct styrene rod, part number MR -100, 2.5mm in
diameter at a cost of about $1.40, and 2 snap rings, part number
1330, at a cost of
about $1.90 I found these items for retaining the top lid at a NAPA auto parts store. A PVC tube coupler is used as the housing,
with a D ring to link it into the recovery system, both found at a local hardware store. A 17" x 8.5" x 1/8" sheet
of SIG ABS plastic
was found at my
local hobby shop at a cost of about $3.35 to make both bottom
& lid for the housing.
Results: The sonic locator built here is louder
- 120 Db vs.110 Db, cheaper
in cost - $19.00 vs. $29.95,
has less weight - 2.8 vs. 6.0 ounces, and is smaller in
size - 4.5" vs. 6.5" in length, than the Transovle Transbeep.
wish to thank Scott Eakins who submitted the
article to Rocketry Online's Tech Series where I drew my ideas
The Flight computer system I
have chosen to use is a G-Wiz LC
Deluxe 800 Some of the reasons I have chosen to use it
1. It uses an accelerometer
over a barometric sensor which can be prone to false readings during Mach
transitions. This may lead to early recovery system deployments,
resulting in shredding or zippering of your beloved rocket.
2. It's small, 4.0" x
.7" x .6", and lightweight, 1 ounce without batteries.
It can handle the current flow for electric matches. You can if necessary
add two 9 volt batteries for more amps & current flow. It also has 3
firing circuits - 1st. is staging, 2nd. is apogee
recovery deployment, and 3rd. is final chute deployment.
Update Nov 27 2000 After surfing
rocket sites if found a good article on current & amps needed to fire different
types of electric matches and igniters. Done by
Frank Broidy and his
Citius Altius Fortius
Page 1 of 3
Rubber band shock cord into two, 6 inch loops either side of center
parachute hook up.
Check Piston & strap for damage. secure lower end of shock
qa. Rubber band piston
strap into 6 inch loop.
qb. Talc upper section
bore, secure parachute to shock cord talc chute, fold, and place in upper
qc. Attach upper end of
shock cord to nosecone. Seat nosecone into upper section.
qd. UPPER SECTION
ITEM Safety Glasses Required
q1. Safety the
G-wiz flight computer by inserting open circuit dowel into ground safety jack
& removing all batteries and wiring harnesses from flight computer.
qa. Set electric matches into charge canisters and
holders, Qty. 2. After installing electric matches into charge canisters
re-shunt and cover bare ends.
qb. Measure black powder
FFFFG, Qty. of .02 to .03
grams, into the charge canisters, place paper disc on top of
black powder to seal BP from tracking powder, add xxx grams tracking powder to
canisters and seal with orange plastic covers. Convert
xx Grams x 15.43 = xx Grains or xx
Grains x .0648 = Grams
all batteries and wiring harnesses from G-wiz flight computer. Before installing
charge canisters and electric match, hook up to Output Terminals
of flight computer.
qd. Trim wire to length,
strip and hook up upper section charge canister to Terminal Block
# 5 & 6 or
Pyro ch. 3
qe. Trim wire to length, strip and hook up mid
section charge canister to Terminal Block # 3 & 4
or Pyro ch. 2
q2. Check lower piston & strap for damage.
Rubber band piston strap into 6 inch loop.
Install rocket-wiring harnesses onto flight computer.
qb. Install fresh
batteries for pyro channels and flight computer.
2 of 3
Citius Altius Fortius Maximus!
qc. Check JP 2 jumper
for staging: out
= staging in
flight computer with window on rocket to allow visual confirmation of
computer power-up at launch pad.
qd. Assemble CPR 3000
Mid Section Aft:
q1. Rubber band shock cord into two, 6 inch loops either side of center
parachute hook up. Attach upper end of shock cord to lower piston in lower mid
section. Prep sonic locator by
installing fresh battery, test by pulling arming pin. If sound is made, device
is working. Re-arm locator by replacing arming
pin. Attach at center point of shock cord
Talc lower end of mid section bore, secure parachute to shock cord talc chute,
fold, and place in the lower end of mid section.
qb. Attach lower
end of shock cord to Sustainer Fin can. Eyebolt.
Seat fin can into lower end of the mid section.
qMid Section Complete
Sustainer Fin Can Motor Assembly
q1. Follow manufacture’s instruction sheet.
qa. Place completed
motor into sustainer, and install motor retaining clip.
qb. Check fin alignment
fore to aft.
qc. Fill out flight card
and indicate whether or not the flight is for cert. level.
qb. Have igniter, flight
card, rocket and rocket simulation flight data for RSO.
qLaunch pad Checklist
qa. Place igniter into
motor and secure it to rocket. Load rocket onto launch rail
qb. Connect leads to
G-wiz flight computer by pulling open circuit dowel out of normally closed
ground safety jack
Check List For
3 of 3
Citius Altius Fortius Maximus!
qc. Check Pyro Status
LED for Continuity channels #2 &
#3 a and check Status
LED for proper condition:
2 flashes = Staging
1 flashes = Clustering
q level 1
q Level 2
Motor configuration Sustainer
This page was last updated on 12/09/01.