If I have understood it right, then the literature you showed says that the chamber volume for the L* formula includes the converging section as well as the cylindrical section of the chamber, so I think your L* might be a tiny bit out. It says it just below figure 1.7. Have I not understood?
Yes, sorry, you are correct. The volume of the chamber should include both the cylindrical section and the converging section up to the throat. I think I have seen it done both ways, but it is more correct to also include the converging section. You can see that RPA gives a cylindrical length of 103mm in this example whereas my spreadsheet overestimates it at 125mm. I will add a correction, thank you!
If I have understood it right, then the literature you showed says that the chamber volume for the L* formula includes the converging section as well as the cylindrical section of the chamber, so I think your L* might be a tiny bit out. It says it just below figure 1.7. Have I not understood?
Yes, sorry, you are correct. The volume of the chamber should include both the cylindrical section and the converging section up to the throat. I think I have seen it done both ways, but it is more correct to also include the converging section. You can see that RPA gives a cylindrical length of 103mm in this example whereas my spreadsheet overestimates it at 125mm. I will add a correction, thank you!
Wonderful videos, sharing this with my club in our efforts to make a liquid rocket engine ourselves!
Hey there. This is such an informative video sessions. I hope you make more detailed videos explaining other areas such as cooling, etc.. 🔥🔥🔥
thanks looks great!
9:02 but most of amateur rocket are large and skiny and raptors from SpaceX are more normal. The RPA how sugest that?
Great videos :)