Comments on: Basic physics question https://habitablezone.com/2025/02/27/basic-physics-question/ Tue, 07 Apr 2026 19:18:10 -0700 hourly 1 http://wordpress.org/?v=3.3.1 By: RobVG https://habitablezone.com/2025/02/27/basic-physics-question/#comment-53950 RobVG Tue, 04 Mar 2025 04:15:46 +0000 https://habitablezone.com/?p=105758#comment-53950 A lot of us are "Born Again Rocketeers" who flew in the 70s. It's still just as exciting. A lot of us are “Born Again Rocketeers” who flew in the 70s. It’s still just as exciting.

]]> By: podrock https://habitablezone.com/2025/02/27/basic-physics-question/#comment-53949 podrock Tue, 04 Mar 2025 03:59:25 +0000 https://habitablezone.com/?p=105758#comment-53949 From a dry cell battery and a push button. I'll have to visit their site. From a dry cell battery and a push button.

I’ll have to visit their site.

]]> By: RobVG https://habitablezone.com/2025/02/27/basic-physics-question/#comment-53948 RobVG Tue, 04 Mar 2025 03:29:10 +0000 https://habitablezone.com/?p=105758#comment-53948 If I have the same problem you did, it'll be a disaster. If I have the same problem you did, it’ll be a disaster.

]]> By: RobVG https://habitablezone.com/2025/02/27/basic-physics-question/#comment-53947 RobVG Tue, 04 Mar 2025 03:27:54 +0000 https://habitablezone.com/?p=105758#comment-53947 A lot has changed. Staged ignition and ejection charges can be ignited with flight computers which also log all the flight data. The computers have bluetooth and you can read the flight event plots on your phone- in the field. I have a chute release which lets me preset the opening altitude. I mainly use Estes black powder motors, but the ones for this rocket are ammonium perchlorate composites, just like the solid rocket boosters on the space shuttle. They cost a little more, but they have 3 times the total impulse of the same size Estes motor. One thing about the rocketeers today, once they start talking about rockets, they never shut up... A lot has changed. Staged ignition and ejection charges can be ignited with flight computers which also log all the flight data. The computers have bluetooth and you can read the flight event plots on your phone- in the field. I have a chute release which lets me preset the opening altitude.

I mainly use Estes black powder motors, but the ones for this rocket are ammonium perchlorate composites, just like the solid rocket boosters on the space shuttle. They cost a little more, but they have 3 times the total impulse of the same size Estes motor.

One thing about the rocketeers today, once they start talking about rockets, they never shut up…

]]> By: podrock https://habitablezone.com/2025/02/27/basic-physics-question/#comment-53946 podrock Tue, 04 Mar 2025 02:25:04 +0000 https://habitablezone.com/?p=105758#comment-53946 When I tried two engines as a kid, I could never get them to ignite at exactly the same time, leading to entertaining telemetry. When I tried two engines as a kid, I could never get them to ignite at exactly the same time, leading to entertaining telemetry.

]]> By: RobVG https://habitablezone.com/2025/02/27/basic-physics-question/#comment-53943 RobVG Mon, 03 Mar 2025 19:58:06 +0000 https://habitablezone.com/?p=105758#comment-53943 <img src="https://www.habitablezone.com/wp-content/uploads/2025/03/Motor-details.png" alt="engine details" />Engine details engine detailsEngine details

]]> By: RobVG https://habitablezone.com/2025/02/27/basic-physics-question/#comment-53942 RobVG Mon, 03 Mar 2025 19:53:13 +0000 https://habitablezone.com/?p=105758#comment-53942 Sorry Pod. I went straight to talking about the rocket. The coupler weighs 40 grams, about 5% of the total weight. The pic of the finished rocket was done by severely hacking the OpenRocket software to show the blast ring and engine details. It's a competition among OpenRocket users to draw things that we shouldn't be able to. Sorry Pod. I went straight to talking about the rocket.

The coupler weighs 40 grams, about 5% of the total weight.

The pic of the finished rocket was done by severely hacking the OpenRocket software to show the blast ring and engine details. It’s a competition among OpenRocket users to draw things that we shouldn’t be able to.

]]> By: RobVG https://habitablezone.com/2025/02/27/basic-physics-question/#comment-53941 RobVG Mon, 03 Mar 2025 19:46:27 +0000 https://habitablezone.com/?p=105758#comment-53941 <img src="https://www.habitablezone.com/wp-content/uploads/2025/03/Looks-HA.png" alt="For Looks" />Just for looks For LooksJust for looks

]]> By: RobVG https://habitablezone.com/2025/02/27/basic-physics-question/#comment-53940 RobVG Mon, 03 Mar 2025 19:38:11 +0000 https://habitablezone.com/?p=105758#comment-53940 <img src="https://www.habitablezone.com/wp-content/uploads/2025/03/Titan-II-HZ.png" alt="Design" />Design DesignDesign

]]> By: RobVG https://habitablezone.com/2025/02/27/basic-physics-question/#comment-53927 RobVG Fri, 28 Feb 2025 21:22:56 +0000 https://habitablezone.com/?p=105758#comment-53927 This will be a low power rocket. Static tests are typically done with high power rockets. The ejection charge is separate from the motor. Only the charge is loaded. This rocket will take a year to complete but I can get it to the testing phase in a few months. I'll be using a single-use Estes black powder motor with a max thrust of 7.4 lbs. The ejection charge is part of the motor. I've never seen a live-motor ground test done with a model rocket. It'll be interesting. This will be a low power rocket. Static tests are typically done with high power rockets. The ejection charge is separate from the motor. Only the charge is loaded.

This rocket will take a year to complete but I can get it to the testing phase in a few months. I’ll be using a single-use Estes black powder motor with a max thrust of 7.4 lbs. The ejection charge is part of the motor. I’ve never seen a live-motor ground test done with a model rocket. It’ll be interesting.

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