OFMM Science Goals - Surface: Discussion

[Loru]

either my calculations are wrong or tungsten cone will be 70 cm high 27cm in diameter

...and thing weights 257.165 kg

 

[MaverickSawyer]

Sounds about right. a 4 meter long, 20 cm diameter rod comes in at over a ton.
So, we kick that out and raise apoapsis, then drop periapsis, and then BAM!

 

[Urwumpe]

either my calculations are wrong or tungsten cone will be 70 cm high 27cm in diameter

...and thing weights 257.165 kg

Sounds realistic. Tungsten is a VERY dense material. Is comparable to depleted Uranium, but lacks the flammability of DU in use for projectiles.

You should make the cone hollowed out at the aft end, so the CoG is further in the front, this makes sense and is a good optimization...maybe have 80% of the hull cone empty (effective density 80% lower).

 

[garyw]

You don't need my authorisation for this - I'm only co-ordinating, it's up to you guys flying the missions what you want to do - I'm just aware that we don't want to get caught up in development hell.

The final supplies lists still have to be defined and that'll be a different thread for mission planning those supplies drops.

 

[Loru]

So let's assume effective density at 4g/ccm and I det around 1.2 meter long and 45cm wide cone. Time to make mesh for it

 

[mojoey]

Looks like something from KSP! :lol:

thats what i thought!!!

I like the idea, and if its a ground impactor, don't we want maximum speed on impact?

 

[garyw]

I like the idea, and if its a ground impactor, don't we want maximum speed on impact?

No. You want to cause a seismic event to analyse the planets interior. You don't want to crack the crust or anything.

 

[Loru]

I think for a minor mission component it looks good enough:

 

[Urwumpe]

I think for a minor mission component it looks good enough:

Good enough for government work!

 

[Loru]

Earth orbit trials...

 

[Urwumpe]

How much dV do you plan with? Depending on how we deploy it, we need different maneuver budgets for it.

When we release it during Earth-Mars-Transfer, we only need a little bit of dV for correcting impact site.

If we release it from Mars Orbit, we need much more dV for getting a steep enough reentry angle.

 

[Donamy]

Hope you don't break Mars. :lol:

 

[Cras]

Looks good! I think she will go boom quite adequately.

 

[Urwumpe]

Hope you don't break Mars. :lol:

if it doesn't fit, use a bigger hammer! :lol:

 

[Woo482]

It has around 500 m/s dV with the current code, using solid motors for deorbit

 

[PhantomCruiser]

if it doesn't fit, use a bigger hammer! :lol:

First rule of mechanical engineering?

 

[Loru]

somoeone might want to inspect impact crater after impactor hits mars surface:

 

[MaverickSawyer]

Good idea! no work needed to expose multiple layers of regolith. If we kick it out while in transit, then give it a slight nudge, and have it target near the planned LZ, it's a short hop away. However, we would need to have the sensors emplaced beforehand. :hmm: Could we place them on the cargo landers (the seismometers)?

 

[Loru]

Short before reentry

 

[mojoey]

Good idea! no work needed to expose multiple layers of regolith. If we kick it out while in transit, then give it a slight nudge, and have it target near the planned LZ, it's a short hop away. However, we would need to have the sensors emplaced beforehand. :hmm: Could we place them on the cargo landers (the seismometers)?

how close to the LZ? If its too close, you run the risk of the guidance going kaput and you smashing the LZ to shreds. About 15-20 KM seems about far enough. Or am I missing something?