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Results tagged with amateur-rocketry
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user 6944
Questions regarding model and/or high-powered rocketry.
2
votes
Accepted
How important is the convergence angle of a liquid bipropellant rocket engine
Have a look at Sutton (7th edition online here) Chapter 3.4
The converging nozzle section between the chamber and the nozzle throat has
never been critical in achieving high performance. The subsonic …
- 189k
2
votes
Trying to make a program to calculate (liquid) engine size. Can you please help me check for...
After the edits, I check your numbers down until the stay time. When you changed the L*, did the $V_1$ change from the number you give at the beginning?
For $V_c / (\dot m V_1)$ I used 0.000389/(0.216 …
- 189k
3
votes
How does the open expander cycle separate the fuel for the pump and combustion chamber?
The paper Cycles for Earth to Orbit Propulsion shows that for open (bleed) expansion cycles, the flow paths diverge at the pump outlet. Two designs are shown, the second has a split pump.
The wikipe …
- 189k
4
votes
Accepted
Source of Gregorek's popular drag equation in ESTES TR-11?
I don't see the exact equation that is in the question, but it
looks like it's derived from equations in Chapter VI Paragraph C "Drag of Streamlined Shapes" in Hoerner 1965 Fluid-Dynamic Drag. At leas …
- 189k
2
votes
Problems with the "How to Design, Build and Test Small Liquid-Fuel Rocket Engines" text
One of the online versions of this book, the one found here, includes an "Additions and Corrections" page.
The fifth bullet point on this page states:
In the example calculation, I think there ma …
- 189k
5
votes
Accepted
I don't know where to start with the calculations - rocket engine
The reason you can't finish your calculations is that you are missing half of the engine. You are going to have to make some decisions about the nozzle in order to get exhaust velocity.
I'll make some …
- 189k