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OFMM Discussions for the OFMM project.

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Old 01-07-2012, 11:28 PM   #76
MaverickSawyer
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Ah. I see what you mean. I always thought of the RV from the Titan II.
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Old 01-07-2012, 11:33 PM   #77
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Originally Posted by MaverickSawyer View Post
 Ah. I see what you mean. I always thought of the RV from the Titan II.
That is old technology. NASA uses it as reference shape because they want to have something left they can recover.

Modern ICBM warheads have extremely low drag, get much more heating as such a blunt shape, but at the same time, don't slow down much before reaching their target and experience such high heating for only a short period of time before impact - the structure of the reentry vessel acts as heat sink and is permitted to get very hot.

It doesn't matter since it is destroyed anyway during the explosion - or in our case, for the impact.

Such a warhead gets the same peak deceleration as your blunt warhead would get during ballistic reentry - but it gets it at very low altitude, sometimes the nuclear warhead explodes even before reaching theoretical peak deceleration.
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Old 01-07-2012, 11:35 PM   #78
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OK, then I retract my previous statement. BOMBS AWAY! If Loru can get it up, I think we can use it, subject to final authorization by Gary.
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Old 01-07-2012, 11:47 PM   #79
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Originally Posted by MaverickSawyer View Post
 OK, then I retract my previous statement. BOMBS AWAY! If Loru can get it up, I think we can use it, subject to final authorization by Gary.
Loru is at it, I am pretty sure he can make something good of it, it is just a question, if he can get this done before Gary freezes the mission manifest.
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Old 01-07-2012, 11:48 PM   #80
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GO LORU!
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Old 01-07-2012, 11:49 PM   #81
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either my calculations are wrong or tungsten cone will be 70 cm high 27cm in diameter

...and thing weights 257.165 kg
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Old 01-07-2012, 11:51 PM   #82
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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!
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Old 01-07-2012, 11:54 PM   #83
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Originally Posted by Loru View Post
 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).
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Old 01-07-2012, 11:56 PM   #84
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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.
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Old 01-08-2012, 12:07 AM   #85
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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
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Old 01-08-2012, 12:07 AM   #86
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Originally Posted by MaverickSawyer View Post
 Looks like something from KSP!
thats what i thought!!!

I like the idea, and if its a ground impactor, don't we want maximum speed on impact?
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Old 01-08-2012, 01:45 PM   #87
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 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.
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Old 01-08-2012, 03:23 PM   #88
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I think for a minor mission component it looks good enough:



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Old 01-08-2012, 03:35 PM   #89
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Quote:
Originally Posted by Loru View Post
 I think for a minor mission component it looks good enough:
Good enough for government work!
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Old 01-09-2012, 12:01 AM   #90
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Earth orbit trials...

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