Will I get back from the Mun ?

[Lohan2008]

3.76 t with 98/115 fuel, lv909 engine. Will I get back ??

Edited February 28, 2015 by Lohan2008

[EtherDragon]

Should be no problem. All you need to do is get to orbit and Munar escape. Make sure that your Munar ejection burn is arranged such that it ends up sending you retrograde w.r.t. Kerbin. Set your Kerbin Periapsis at 30km, reenter and recover - for Science! I have returned with similar craft with similar equipment many times.

[Reactordrone]

Should make it. I estimate over 1200m/s delta V which is more than enough.

Added- if you want to do the rocket equation delta V = g x Isp x ln current mass/ dry mass which in this case is 9.82 x 390 x ln3.76/2.715 = 1247m/s

Your fuel oxidizer ratio is slightly unbalanced so you can only use 94 of your 98 fuel with that amount of oxidizer.

Edited February 28, 2015 by Reactordrone

[worir4]

Don't forget, if you mess up, you can always get out an push!

[SRV Ron]

You are lucky that tippy thing landed upright. Getting back will be tight. Fly carefully and aim for aerobraking.

[Lohan2008]

Thanks guys!

I made my launch angle 60 and kept going til I cleared the Mun influence.

I am usually conservative and circularise around the 'back'.

[Hobbes Novakoff]

If it has 1200 delta-v that should surely be enough, I've learned (through trial and a lot of error) that LMO->Surface->LMO->Kerbin impact trajectory requires about 1750 m/s, this was with MJ though so I always take along about 2k. I haven't bothered to split that up into bits though.

[Osprey]

Added- if you want to do the rocket equation delta V = g x Isp x ln current mass/ dry mass which in this case is 9.82 x 390 x ln3.76/2.715 = 1247m/s

Surely g =/= 9.82 in this scenario as he's launching from the Munar surface? Just a pedantic point.

[FleshJeb]

Surely g =/= 9.82 in this scenario as he's launching from the Munar surface? Just a pedantic point.

That's how ISP is defined. Think of it more as a conversion factor and don't worry about the source. There are non-geocentric ways of defining ISP. This is just how KSP and most of the scientific world do it.

http://en.wikipedia.org/wiki/Specific_impulse#Specific_impulse_as_a_speed_.28effective_exhaust_velocity.29