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Esa
Well-Known Member
Are you also Turkish?
Esa
Well-Known Member
I had a feeling. Now it’s confirmed.
Esa
Well-Known Member
That big city in the west people hate for being non religious
It says “Just a small town girl” on your profile, that’s why I assumed you might be from mine.
Because I’m from the one between your city and Istanbul, which is like a baby Izmir in some ways.
(Çanakkale)
Esa
Well-Known Member
Yeah, it’s unusual.
GrownupGirl
Tempermental Artist
Cute
Model rocket engine propellant punches and tampers I made for a friend.
Either an arbor press or a hammer will provide the forces required to assemble the engines.
Blue indicates the stainless steel nozzle form sample.
Brass was chosen as an alternative to the more difficult to machine stainless because of spark concerns.
Can't have an engine go hot on the bench in a pile of rocket fuel
Blue are the engine tubes, while red are the tampers
Brass tamper slid onto the stainless sample.
The tampers have a 1/8 inch hole drilled to 1.5 inches deep, which can be tricky in common yellow brass.
The project was to make nozzle pins for different sized engine charges. Interchangeable pins will be made of brass to allow for differing lengths which will also require tapers so they release easily.
The pins are for the initial fast burn for liftoff thrust which later slows to a sustained lower thrust after gravity has been initially overcome.
Common kitty litter made into a paste is used at the nozzle end and the upper end of the cardboard tubes to retain the fuel charge.
Blue indicates the stainless steel nozzle form sample.
Brass was chosen as an alternative to the more difficult to machine stainless because of spark concerns.
Can't have an engine go hot on the bench in a pile of rocket fuel
Blue are the engine tubes, while red are the tampers
Brass tamper slid onto the stainless sample.
The tampers have a 1/8 inch hole drilled to 1.5 inches deep, which can be tricky in common yellow brass.
The project was to make nozzle pins for different sized engine charges. Interchangeable pins will be made of brass to allow for differing lengths which will also require tapers so they release easily.
The pins are for the initial fast burn for liftoff thrust which later slows to a sustained lower thrust after gravity has been initially overcome.
Common kitty litter made into a paste is used at the nozzle end and the upper end of the cardboard tubes to retain the fuel charge.
Last edited:
It was chosen for the plain styled frame with glass.
The pastel blue frame was painted black to match the theme of the $9.99 poster bought at a Spencer's Gifts outlet in a local mall.
The original matted print was stapled in place, so I opted to retain it with lathing, #4 wood screws and a slight amount of hot glue to add slight pressure to the glass. The screws added another $4.99 to the bill of materials.
It ain't real pretty, but very strong.
I found it amusing that Marilyn has a tat that reads RIP JFK.
Most unfamiliar with the chains of events from that era may not get the irony of that
I have about 6 hours and $19.05 for the entire project just because I thought it was cool
Last edited:
Update on the rocket engine tooling.
The #6-32 tap arrived for threading the pin retention holes.
The holes were drilled past the center of the anvil in order to get a complete thread thru the center hole.
Anvil with pin and retaining bolt:
A longer socket head cap screw was chosen to eliminate the need for a wrench to tighten it.
In this image, I have highlighted the slight undercut (blue) to assist in pin retention without excessive bolt torque that would likely deform the pin if tightened with a wrench against the full diameter of the pin.
The pin was tapered by .010" in it's exposed length (red)
to assist in removal from the rocket engine charge after tamping.
The pin diameter where it enters the anvil is 1/8th of an inch, or approximately 3mm
The #6-32 tap arrived for threading the pin retention holes.
The holes were drilled past the center of the anvil in order to get a complete thread thru the center hole.
Anvil with pin and retaining bolt:
A longer socket head cap screw was chosen to eliminate the need for a wrench to tighten it.
In this image, I have highlighted the slight undercut (blue) to assist in pin retention without excessive bolt torque that would likely deform the pin if tightened with a wrench against the full diameter of the pin.
The pin was tapered by .010" in it's exposed length (red)
to assist in removal from the rocket engine charge after tamping.
The pin diameter where it enters the anvil is 1/8th of an inch, or approximately 3mm
GrownupGirl
Tempermental Artist
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