hypersonic

i was so speechless playing ksp today. I landed on slope of Minmus and when kerbal got off from external seat they just fall all the way down the hill. I waited for a long time hoping he would stop, but due to low gravity he just gain speed and finally died. it's so annoying and I can't switch on his EVA thruster to stable him. are there any ways to make sure kerbals stand straight after leaving external seat? Thanks all

hello kerbalnauts, can someone recommend some mods to make computer faster? with the new thermal system, my computer slow as hell during reentry, and sometimes just quit when there're too many parts, I guess RAM isn't enough?

HaHa Cool, Thanks Padishar

Thanks everyone for the reply so there is a little bug in Isp calcs? Can someone report to mod coders? BTW, how to reply to a single thread instead of posting a new one? I believe I pressed the 'reply' from the right corner

I built like this only for testing in VSB. the reading is same no matter how you rotates the engine. (when you actually fly it it will be different of course.) They are in same stage, and fires at the same time. the original problem arise when I fly satellite with an ion thruster in the middle and liquid fuel engines attached radially, dV shown is above 10km/s, but actually feels like a few thousand, so I doubt the Dv calcs.

Hello Kerbal-nauts, I posted this on GamePlay section and someone suggests me to post it here: The problem arise when I fly satellite with an ion thruster in the middle and liquid fuel engines attached radially, dV shown is above 10km/s, but actually feels like a few thousand... so I simplify it and make a test prob: - - - Updated - - - - - - Updated - - - change amount of xenon gas to 140 units so that the two engines burn about the same time. Therefore adds additional 140 unit of Xenon gas and an ion thruster adds 4891m/s ?? It's not possible, just estimate it, using TWR and burning time. I did some calcs: Isp=T/mdot/9.81=(2000+60000)/(0.04849+17.728)/9.81=355.53 (I think gravity on kerbin is same as that on Earth?) but on KER and mechjeb it shows 794.7 I'm little confused now, can someone help? Thanks.

Thanks for the tips! here're the links to the pics, hope those works. http://imgur.com/bdIu70k&hXYBsRc#0 http://imgur.com/bdIu70k&hXYBsRc#1 why can't just upload pics from desktop? - - - Updated - - - - - - Updated - - - - - - Updated - - - Yes you're right. It confuses me when Dv drops like 40m/s but the acceleration shown is around 10m/s. I think Isp it calculates is not right. Isp=T/mdot/9.81=(2000+60000)/(0.04849+17.728)/9.81=355.53 (I think gravity on kerbin is same as that on Earth?) I sent the pics and it says 794.7 Dv calculated using -Isp*g*ln(mf/mi) is correct how does KER and Mechjeb calculates it?

Thanks for replying! this is my first time post on this forum, can't figure out how to sent pics... I test in space of course. The problem arise when I fly satellite with an ion thruster in the middle and liquid fuel engines attached radially, dV shown is above 10km/s, but actually feels like a few thousand... so I made up this new test prob: 1. choose a MK1 command pod. 2 connect Oscar-B fuel tank,FL-T200 and rocketmax X200-8 fuel tank 3.connect a LV-909 'Terrier' engine on the bottom. so the TWR is 0.85, Dv= 4346 and burn 4m 53.2s. Next attach small Xenon container on top of MK1 pod with an ion thruster, change Xenon gas to 140 units so the two engine burn about the same time. ignore the thrust direction... have no influence on KerbalEngineer calculation. the result is TWR=0.84 and Dv=9237 Therefore adds additional 140 unit of Xenon gas and an ion thruster adds 4891m/s ?? It's not possible, just estimate it, using TWR and burning time. Hope someone will help me, Thanks:D

any ideas why adding an ion thruster with 210 unit of xenon gas adds addition 4891m/s of deltaV?? I tested it and find out it's not right. Can anyone figure it out? Thanks!! Edit: I send pics to #9.