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2Instructables422,392Views1,213CommentsGeorge West, TX and San Antonio, TXJoined May 3rd, 2007
I was an engineer for the Air Force for 28 years and did land ownership research across Texas for several years. Now I am a field appraiser for a tax district.

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  • dchall8 commented on air.command's instructable Water Rocket 2-Stage Mechanism1 week ago
    Water Rocket 2-Stage Mechanism

    While this I'ble is very good at guiding the construction (which is genius in the use of hardware store parts), I had no vision of how the thing worked. There is a lot of "do this and do that," but nothing explaining how the parts work together. After reading all the way through I finally got to the end with a link to an external website where the operation was explained in a few paragraphs. Now when I go back to the top I have a context as to what you're doing, why, and how the parts work together to separate the 1st stage from the 2nd stage. Here's a suggestion to describe how this mechanism works.This water rocket stage release mechanism was developed to provide automatic staging of multi-stage water rockets. On the launch pad the mechanism locks the two stages together...

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    While this I'ble is very good at guiding the construction (which is genius in the use of hardware store parts), I had no vision of how the thing worked. There is a lot of "do this and do that," but nothing explaining how the parts work together. After reading all the way through I finally got to the end with a link to an external website where the operation was explained in a few paragraphs. Now when I go back to the top I have a context as to what you're doing, why, and how the parts work together to separate the 1st stage from the 2nd stage. Here's a suggestion to describe how this mechanism works.This water rocket stage release mechanism was developed to provide automatic staging of multi-stage water rockets. On the launch pad the mechanism locks the two stages together by the weight of the second stage pushing against a quick-release connector for a garden hose. The 2nd stage weight compresses a spring inside the mechanism. There is a flexible air pressure transfer tube which allows the two stages to be pressurized at the same time. Water and pressure leaks are prevented by the arrangement of valve parts inside the mechanism. In flight when the 1st stage booster stops producing thrust, the rocket approaches a weightless state where the spring pushes the stages apart. When the parts separate the interlock releases the stages which releases the pressure in the second stage, thus allowing the 2nd stage to fly higher. After release the staging mechanism remains attached to the 1st stage booster and can be reused after a parachute recovery (not included in this Instructable). As for the parts used, you have the experience and have better insight into the durability of this, but I would think a thin-walled PVC would be more sturdy than the FTC tubing you use. Of course you can't cut PVC to open up the diameter like you do with the FTC, so there is that. Anyway this is a very clever use of simple parts to make an amazingly complex separation system.

    As I continue to reply to myself, I found several sources for the Gardenia Launcher. Good stuff.

    And now that I think a little more about it, would parts of this system make a much better ground launch pressurization and fly-away nozzle for a 1 stage rocket? Again, not having tried it, it seems like the smaller nozzle you use would work better than the 1/2-inch open bottle neck nozzle.

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  • dchall8 commented on KarenK116's instructable PVC Pipe Rain Stick3 weeks ago
  • dchall8 commented on Andrew Sleigh's instructable How to Make a Tyvek Wallet2 months ago
    How to Make a Tyvek Wallet

    I got the glue at Michael's Hobby store. There are several fabric glues made under the same name. I used the one I perceived to be the most permanent. I'm not near my supplies at the moment, but I remember buying more than one bottle just in case the first one didn't work. So I couldn't tell you which one I used even if I found them. But I could narrow it down to those two.

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  • dchall8 commented on Andrew Sleigh's instructable How to Make a Tyvek Wallet2 months ago
    How to Make a Tyvek Wallet

    Very nice! I made a tri-fold Tyvek wallet back in 2009. I figured being Tyvek it would be the last wallet I ever needed, but I was wrong. Tyvek will not tear or rip, but it will wear out. I still use it although it looks shredded. I used a FedEX envelope for the Tyvek and I used fabric glue instead of thread to hold it together. The glue worked perfectly.

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  • dchall8 commented on EdwardJ13's instructable Document Camera & Scanner2 months ago
    Document Camera & Scanner

    Beautiful. When I saw the picture I thought, "Great! Another cardboard project!!" But it's plywood. But that doesn't mean it couldn't be made from cardboard. Glue several pieces of corrugated cardboard with the corrugations going across each other and you end up with a very strong, thin structure. I used to work on a team to photograph old documents. We looked into many different devices like this, but technology had not caught up. Lighting was the main problem. With flat LED under-counter lights, you could easily illuminate this without adding bulk or much weight. String lights would work mounted underneath. The light from the phone turned out to be too uneven at the edges, so we were using external desk lamps (2008 - no LEDs yet). Great project. Thanks.

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  • dchall8 commented on T0BY's instructable Build Your Own Adirondack Chair Plans2 months ago
    Build Your Own Adirondack Chair Plans

    Having gone through the exercise, nice job by the way (!), if you wanted to make the seating height at least 6 inches higher, what would you change? I'm both tall and getting older. Getting up out of an Adirondack Chair ain't what it used to be.

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  • dchall8 commented on Amano_Fix It's instructable Make Your Own Chicken (or Beef) Broth 2 months ago
    Make Your Own Chicken (or Beef) Broth

    Very nice.My wife makes chicken broth (it jells). She doesn't bake anything more than what is already cooked. She uses skin and bones. Bones are broken with pliers before cooking to let the marrow out.

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  • dchall8 commented on Tango172's instructable Turn a Toy Gun Into an Awesome Prop Weapon!3 months ago
    Turn a Toy Gun Into an Awesome Prop Weapon!

    I just watched Adam Savage do a Nerf gun. He used a product called Rub and Buff to put a highlight on the rubbed edges of the weapon. Rub and Buff is a paste made with mica. Apparently mica powders and pastes are used in other hobbies. A quick substitute for mica powder is women's eye shadow - the metallic ones. So I'm looking for a palette of metallic eye shadows.

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  • dchall8 commented on Tango172's instructable Turn a Toy Gun Into an Awesome Prop Weapon!4 months ago
    Turn a Toy Gun Into an Awesome Prop Weapon!

    You inspired me. I started with a $3.00 dart gun from the grocery store. Painted with Rustoleum Silver Metalic (left side) and Bronze (right side). Aged the left with black and dark brown acrylics. Highlighted the left with silver Sharpie and right with Gold Sharpie. Will be aging the right side with the brown to start and see where that goes. Final will be Rustoleum clear coat. Thanks!

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  • dchall8 commented on mmchenry's instructable Reforming Soap Scraps4 months ago
    Reforming Soap Scraps

    Back in 2007 the MicroPlane brand was the only one that had a zesting quality blade. I believe there are others now. Look for the finest grater you can get at Bed, Bath, and Beyond.

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  • dchall8 commented on diycreators's instructable How to Make a Fire Bowl5 months ago
    How to Make a Fire Bowl

    If you make another one, pull the concrete out of the bowls right after it sets, and then sand the top flat. Concrete that has not hardened completely is much easier to sand.

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  • dchall8 commented on degrooty's instructable Laser Cut Stones5 months ago
    Laser Cut Stones

    I get the idea of hiding a spare key, but I don't get the idea of granting unlimited and forever access to anyone who has a memory or has a camera on their cell phone.

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  • dchall8 commented on zposner's instructable Hose Revival5 months ago
    Hose Revival

    gm280 has the start for stopping leaks. Brass is a funny metal, and all hoses and faucets come with brass parts. When you get a leak in a brass fitting, the water will erode the brass where it is leaking. I wasn't trying to demonstrate that concept, but I ended up eroding an expensive, solid brass, Sears Craftsman female fitting just 30 minutes after using it for the first time. I didn't even need a magnifying glass to see it. I could see it and feel it with my fingernail. So if you are going to use brass, use the hose washer and tighten it. Also make sure the male sides of the fitting are PERFECTLY flat across. This starts with the hose bib and goes to the ends of the hoses. In order to ensure they are flat you can use a file to flatten or do what I do. I cut off the ends and...

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    gm280 has the start for stopping leaks. Brass is a funny metal, and all hoses and faucets come with brass parts. When you get a leak in a brass fitting, the water will erode the brass where it is leaking. I wasn't trying to demonstrate that concept, but I ended up eroding an expensive, solid brass, Sears Craftsman female fitting just 30 minutes after using it for the first time. I didn't even need a magnifying glass to see it. I could see it and feel it with my fingernail. So if you are going to use brass, use the hose washer and tighten it. Also make sure the male sides of the fitting are PERFECTLY flat across. This starts with the hose bib and goes to the ends of the hoses. In order to ensure they are flat you can use a file to flatten or do what I do. I cut off the ends and replace them with plastic fittings. Plastic fittings are always flat, and plastic does not erode if it isn't tight enough. I also use #15 O-rings instead of flat washers for all my female ends.

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  • dchall8 commented on MadeByBarb's instructable DIY Concrete Faux Geode Lamp6 months ago
    DIY Concrete Faux Geode Lamp

    Good project. There's probably a (more expensive) way to do that with modeling clay if you don't want to get dusty.

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  • dchall8 commented on fannybekker's instructable Homemade Slime9 months ago
    Homemade Slime

    If you leave this out, will it harden?

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  • dchall8 commented on RoddyTheGreat's instructable Penknife Grip10 months ago
    Penknife Grip

    After many years, how is the Sugru holding up? Have you had to replace it?

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  • Fixing Frosted Chalked and Faded Headlights

    I used clear Rustoleum after the fine sanding. That truly is the secret. Well done.

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