Never say never, but I think It works well using chamber pressure for nuclear thermals. The H2O nuclear thermal has the highest density impulse in the game currently, so it has an interesting advantage over the LH2 at the same chamber pressure. If a player were so inclined, they could certainly XML mod the engine and increase chamber pressure to match thrust power. @Gregrox
@Gregrox Thank you for the clarification. I'm afraid that our comment character limit may have cut off some of your comment. Sorry about that!
It is a really interesting way to compare the engine types. You would be correct that it would violate the laws of thermodynamics if we claimed both engines had the same power, but they clearly do not. Looking at the Thrust Power equation, I don't see how mdot could be constant between the two.
P = 1/2 * T * Ve P = 1/2 * Isp * mdot * g0 * Ve or P = 1/2 * mdot * Ve^2
If Isp and Ve decrease then mdot would need to increase to give equivalent power. The player can increase mdot by increasing the throat radius of the engine and/or increasing chamber pressure.
We are approaching things a bit differently. Instead of holding power constant between fuel types, we hold chamber pressure constant and calculate everything else from that. This allows us to calculate exit pressure dynamically from their nozzle parameters (edit: and update Isp) as the player moves through an atmosphere.
@Gregrox The molecular weight is higher for H2O vs LH2, which results in higher mass flow, but slower exhaust velocity and gives about the same thrust between the two propellants. Without changing chamber pressure or the throat radius it doesn't affect thrust. Water does have the advantage of much higher density impulse. We had some more discussion about this on your suggestion post. Let me know if you find any flaws in my thinking. I appreciate your feedback.
I tweaked the masses and prices of the rocket engines quite a bit with this update. I think they should be a lot more reasonable now and react a bit more realistically to the settings (ie - no more negative masses). Let me know if you see any odd cases.
@SupremeDorian It's useful in case you get really thirsty in space. Also, the nuclear thermal engine can break it down into hydrogen and oxygen and then combust it, which gives great specific impulse and great density impulse. You can thank @Gregrox for that idea,
Thanks @mjdfx150529. You have some good ideas in there. I'm not sure when we will start on tech trees or campaign mode, but it is good to bounce some ideas around.
@MrMiner101 We are releasing on mobile next year. Sadly, I can't be more specific than that. The last time I tried to make guesses about our schedule, I ended up on camera eating black licorice! Never again!
Can you try downloading a craft again and after it fails, send us a bug report. The log file will hopefully she’d some light on why it’s failing. @Bmcclory @El0nMusk
You can scale up the engine's fuel consumption to increase its thrust. That will get it to about 4,000kN. Still not enough, but you could always XML mod it to what you need.
Some other stuff to try would be removing your SimpleRockets 2 game data folder. Maybe something got into a weird state and is now preventing the game from running. You can try renaming or deleting this folder:
@mjdfx150529 It's okay, like I said I appreciate you looking out for us, but hopefully in the future, we can all deal with these situations a little more gracefully! :D
Thanks for letting us know, guys. He's not a beta tester, but a YouTuber that we gave a press key. He didn't appear to notice that we have an embargo date. Please, let us handle it and don't spam his video with negative comments.
@ACEPILOT109 @SupremeDorian When you click on a part you get a popup that has an EXPLODE button. It was intended just for us for development and testing, but I think we're going to leave it in because it's too much fun. The size of the explosions are now based on what the part is and not necessarily how hard they hit the ground. Fuel tanks with RP-1 and monopropellant blow up nicely. Xenon gas is actually inert.....ie BORING!
@Wadzworth929 No, it doesn't give you a recommendation, but you can easily see where the target will be along any point of your orbit by hovering. It will show you the closest approach info. From that you can fairly easily decide how to change your orbit to get an encounter.
2. Yes you can see how an encounter affects your orbit. You can see briefly in that GIF that my orbit around Smoon is hyperbolic and my resulting orbit after exiting is highly elliptical around Smearth.
@arcues @AstronautPlanes Yes, with the ion engines you can burn while you are time warping. We don't have SRBs yet, but we will add them at some point.
AstronautPlanes, you must have 100 points on SimplePlanes.com to get the 100 point bonus here.
@mjdfx150529 That's great feedback. Can you show me which of those equations you are using to calculate the power consumption?
I will include a gravity turn in the flight tutorial with SR2. I don't know what I was thinking with SR1.
I haven't researched SRBs much yet, but I was thinking we could implement them as normal fuel tank pieces with a special SRB nozzle that is attached to the end. Perhaps this nozzle could have a way to configure the thrust curve.
@KraZIvan Thanks! It's a great craft!
+1 5.6 years ago@Mod haha, that's our secret, we've always been insane!
+1 5.6 years ago@MarioG Unfortunately we won't have time for that with this update.
+1 5.6 years ago@MorrissetteAirplaneCo yep it appears to be related to deleting wings with control surfaces. It will be fixed in the next update.
+1 5.6 years agoNever say never, but I think It works well using chamber pressure for nuclear thermals. The H2O nuclear thermal has the highest density impulse in the game currently, so it has an interesting advantage over the LH2 at the same chamber pressure. If a player were so inclined, they could certainly XML mod the engine and increase chamber pressure to match thrust power. @Gregrox
+1 5.6 years agoCan you send us your log file to games@jundroo.com? You can find it here (assuming Windows):
+1 5.6 years ago%userprofile%\appdata\locallow\Jundroo\SimpleRockets 2\output_log.txt@Gregrox Thank you for the clarification. I'm afraid that our comment character limit may have cut off some of your comment. Sorry about that!
It is a really interesting way to compare the engine types. You would be correct that it would violate the laws of thermodynamics if we claimed both engines had the same power, but they clearly do not. Looking at the Thrust Power equation, I don't see how mdot could be constant between the two.
P = 1/2 * T * VeP = 1/2 * Isp * mdot * g0 * VeorP = 1/2 * mdot * Ve^2If Isp and Ve decrease then mdot would need to increase to give equivalent power. The player can increase mdot by increasing the throat radius of the engine and/or increasing chamber pressure.
We are approaching things a bit differently. Instead of holding power constant between fuel types, we hold chamber pressure constant and calculate everything else from that. This allows us to calculate exit pressure dynamically from their nozzle parameters (edit: and update Isp) as the player moves through an atmosphere.
+1 5.6 years ago@Gregrox The molecular weight is higher for H2O vs LH2, which results in higher mass flow, but slower exhaust velocity and gives about the same thrust between the two propellants. Without changing chamber pressure or the throat radius it doesn't affect thrust. Water does have the advantage of much higher density impulse. We had some more discussion about this on your suggestion post. Let me know if you find any flaws in my thinking. I appreciate your feedback.
+1 5.6 years agoI tweaked the masses and prices of the rocket engines quite a bit with this update. I think they should be a lot more reasonable now and react a bit more realistically to the settings (ie - no more negative masses). Let me know if you see any odd cases.
+1 5.6 years ago@Kell :D
+1 5.7 years ago@SupremeDorian uncheck the option below the build mode and it won’t do that.
+1 5.7 years ago@pedro16797 Thanks for letting me know. I created a forum post here while the release post is not public yet.
+1 5.7 years ago@SupremeDorian It's useful in case you get really thirsty in space. Also, the nuclear thermal engine can break it down into hydrogen and oxygen and then combust it, which gives great specific impulse and great density impulse. You can thank @Gregrox for that idea,
+1 5.7 years ago@Kell If you find some funky configurations, please feel free to send in a bug report and I can investigate them.
+1 5.7 years agoThanks @mjdfx150529. You have some good ideas in there. I'm not sure when we will start on tech trees or campaign mode, but it is good to bounce some ideas around.
+1 5.7 years ago@Mod thanks!
+1 5.8 years ago@Tully2001 That's it for the inlet for now, but we may add some options like the slant to all fuselage parts at some point.
+1 5.9 years ago@MrMiner101 We are releasing on mobile next year. Sadly, I can't be more specific than that. The last time I tried to make guesses about our schedule, I ended up on camera eating black licorice! Never again!
+1 5.9 years agoOkay, thanks for the bug reports. I'm doing a new build now and will have it out shortly to fix the issue with the motor part.
+1 6.0 years agoDo you still have this craft? If so, can you upload it so we can take a look.
+1 6.0 years agoAh, I see. That is unfortunate. Well, when we get the next version out that uses an updated version of Unity maybe you can try again then.
+1 6.0 years ago@Kerbango With SR2 you have much more control of than SP. Just open the Part Shape tool by pressing 'F' and adjust the corner radius.
+1 6.0 years agoCan you try downloading a craft again and after it fails, send us a bug report. The log file will hopefully she’d some light on why it’s failing. @Bmcclory @El0nMusk
+1 6.0 years agoYou can scale up the engine's fuel consumption to increase its thrust. That will get it to about 4,000kN. Still not enough, but you could always XML mod it to what you need.
+1 6.0 years agoSome other stuff to try would be removing your SimpleRockets 2 game data folder. Maybe something got into a weird state and is now preventing the game from running. You can try renaming or deleting this folder:
%userprofile%\appdata\locallow\Jundroo\SimpleRockets 2Also, have you tried uninstalling and re-installing the game?
Are your video card drivers up to date?
+1 6.0 years agoAre you out of hard drive space? The total download size of all files should be over 800MB.
+1 6.0 years ago@ShakzDar Thanks! And thanks for helping us beta test!
+1 6.0 years ago@ThePilotDude Yes, your builds should still be there after getting the Steam version.
+1 6.0 years agoOkay, thanks. Please, let us handle this.
+1 6.1 years ago@mjdfx150529 It's okay, like I said I appreciate you looking out for us, but hopefully in the future, we can all deal with these situations a little more gracefully! :D
+1 6.1 years agoThanks for letting us know, guys. He's not a beta tester, but a YouTuber that we gave a press key. He didn't appear to notice that we have an embargo date. Please, let us handle it and don't spam his video with negative comments.
+1 6.1 years ago@Chancey21 I agree! There are still a million little things to tidy up like that. Getting ready for release is total chaos.
+1 6.1 years ago@SupremeDorian Early Access price will be $14.99. After we finish Early Access, we plan to raise the price to about $19.99.
+1 6.1 years ago@BaconAircraft That video is amazing and so is your Proton-M. I do feel bad about blowing it up so much recently. But not really.
+1 6.1 years ago@ACEPILOT109 @SupremeDorian When you click on a part you get a popup that has an EXPLODE button. It was intended just for us for development and testing, but I think we're going to leave it in because it's too much fun. The size of the explosions are now based on what the part is and not necessarily how hard they hit the ground. Fuel tanks with RP-1 and monopropellant blow up nicely. Xenon gas is actually inert.....ie BORING!
+1 6.1 years ago@SupremeDorian I think it was trying to tell me that I needed to start working on SR2.
+1 6.1 years ago@NazyaMilitare That won't be until next year. I've proven that I'm terrible at estimating, so I won't even venture a guess.
+1 6.1 years ago@Mod I saw your submission! @HellFireKoder also submitted one....
+1 6.1 years ago@XjayIndustrys ha! Thanks, but I will buy my own licorice!
+1 6.2 years ago@SupremeDorian Yes, there are quite a few quality settings that can be adjusted to help improve performance.
+1 6.2 years ago@Wadzworth929 No, it doesn't give you a recommendation, but you can easily see where the target will be along any point of your orbit by hovering. It will show you the closest approach info. From that you can fairly easily decide how to change your orbit to get an encounter.
+1 6.2 years ago2. Yes you can see how an encounter affects your orbit. You can see briefly in that GIF that my orbit around Smoon is hyperbolic and my resulting orbit after exiting is highly elliptical around Smearth.
@arcues @AstronautPlanes Yes, with the ion engines you can burn while you are time warping. We don't have SRBs yet, but we will add them at some point.
AstronautPlanes, you must have 100 points on SimplePlanes.com to get the 100 point bonus here.
+1 6.2 years ago@JohnnyBoythePilot No plans for aerospike engines at the moment. Make sure you leave a suggestion if that's something you want to see in the game.
+1 6.2 years ago@Buntfalke123 Yes, we will have manuever nodes that you can plan in map view.
+1 6.2 years ago@Nooneoone I'm sure we will add more engines over time.
+1 6.2 years ago@tinypoo Yes, there is support for building your own custom subassemblies.
+1 6.2 years ago@Nooneoone No plans for different fuel types at the moment, but feel free to leave a suggestion.
+1 6.2 years ago@Nooneoone We currently have RP-1, Xenon, Monopropellant, and Battery fuel types.
+1 6.2 years ago@DPSAircraftManufacturer We do have prices and plan to do a campaign mode, but what exactly we are going to do is still up in the air.
+1 6.2 years ago@mjdfx150529 That's great feedback. Can you show me which of those equations you are using to calculate the power consumption?
I will include a gravity turn in the flight tutorial with SR2. I don't know what I was thinking with SR1.
I haven't researched SRBs much yet, but I was thinking we could implement them as normal fuel tank pieces with a special SRB nozzle that is attached to the end. Perhaps this nozzle could have a way to configure the thrust curve.
+1 6.2 years ago