Download Pvc Rocket Motor - How to Make It - Diy PDF

TitlePvc Rocket Motor - How to Make It - Diy
File Size118.3 KB
Total Pages5
Document Text Contents
Page 3

Actual Photo of EngineActual Photo of Engine

1. Cut a small disk out of the 1/4"1. Cut a small disk out of the 1/4"
PVC sheet/piece to the exact insidePVC sheet/piece to the exact inside
diameter of the "nozzle" on the PVCdiameter of the "nozzle" on the PVC
male reducer coupling (should bemale reducer coupling (should be
3/4").3/4").

2. Using the purple primer and PVC2. Using the purple primer and PVC
cement, cement the disk into thecement, cement the disk into the
inside of the nozzle right where theinside of the nozzle right where the
reduced part meets the main part of reduced part meets the main part of 
the coupler. (Labeled PVC Holdingthe coupler. (Labeled PVC Holding
Insert in the drawing the left). AllowInsert in the drawing the left). Allow
to dry.to dry.

3. Mix Durham's Rock hard Water 3. Mix Durham's Rock hard Water 
Putty with water until it is thePutty with water until it is the
consistency of loose mayonnaise.consistency of loose mayonnaise.
Pour enough in the wide end of thePour enough in the wide end of the
male reducer coupling to fill if aboutmale reducer coupling to fill if about
half of the way from the cementedhalf of the way from the cemented
PVC insert to the wide end of thePVC insert to the wide end of the
coupling (see drawing). Allow this tocoupling (see drawing). Allow this to
dry for a minimum of 48 hours.dry for a minimum of 48 hours.

4. Drill a 9/32" (.713cm) hole4. Drill a 9/32" (.713cm) hole
through the PVC holding insert, andthrough the PVC holding insert, and
all the way through the water putty.all the way through the water putty.
This is the throat of the engine.This is the throat of the engine.

5. Cut a piece approximately 5" long5. Cut a piece approximately 5" long
from your 1" PVC pipe. The exactfrom your 1" PVC pipe. The exact
length isn't important, as you willlength isn't important, as you will
trim it to exact size later.trim it to exact size later.

6. Measure out 78g of KNO3 and6. Measure out 78g of KNO3 and
42g of Sugar (65% :35% FYI). The42g of Sugar (65% :35% FYI). The
KNO3 you bought is probably notKNO3 you bought is probably not
fine enough for these purposes. Thisfine enough for these purposes. This
is what the coffee grinder is for. Putis what the coffee grinder is for. Put
the KNO3 in the old coffee grinder the KNO3 in the old coffee grinder 
and and rinrind d it it dowdown n as as finfinel el asas

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Nozzle section Nozzle section

Propellant GrainPropellant Grain

 possible. Now pour the KNO3, and possible. Now pour the KNO3, and
the sugar into a small Tupperwarethe sugar into a small Tupperware
container and shake for severalcontainer and shake for several
minutes to thoroughly mix the two.minutes to thoroughly mix the two.

 Note that they should never be Note that they should never be
ground together in the coffeeground together in the coffee
grinder!!grinder!!

7. Widdle the end of your dowel to a7. Widdle the end of your dowel to a
 point. Then coat the hole thing in a point. Then coat the hole thing in a
very thin coat of automotive grease.very thin coat of automotive grease.

8. Put enough shortening in your big8. Put enough shortening in your big
 pan to fill it up about half way when pan to fill it up about half way when
melted. Heat the shortening up tomelted. Heat the shortening up to

 between 350 and 400 degrees F and between 350 and 400 degrees F and
then place your smaller pan in thethen place your smaller pan in the

 bath with some of the propellant bath with some of the propellant
(enough to fill it up about half way(enough to fill it up about half way
in powder form) in it. Stir in powder form) in it. Stir 
continuously and don't let the smallcontinuously and don't let the small

 pan touch the bottom of the big pan. pan touch the bottom of the big pan.
The propellant should start to melt.The propellant should start to melt.
As it does, pour more in, until it isAs it does, pour more in, until it is
all melted. I have had several e-mailsall melted. I have had several e-mails
about the melting process. You wantabout the melting process. You want
to melt it without caremeling it. Thisto melt it without caremeling it. This
means stirring continuously and notmeans stirring continuously and not
letting the melted propellant get anyletting the melted propellant get any
darker than a kind of yellow color.darker than a kind of yellow color.
IT SHOULD NOT BE IT SHOULD NOT BE BROWN!!BROWN!!

9. The propellant should be about the9. The propellant should be about the
consistency of honey, or a littleconsistency of honey, or a little
thinner. Put your 1" PVC pipethinner. Put your 1" PVC pipe
section on a piece of wax paper andsection on a piece of wax paper and

 pour the melted propellant into the pour the melted propellant into the
 pipe. pipe.

10. Immediately put the dowel10. Immediately put the dowel
through the middle of your meltedthrough the middle of your melted

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