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Missile Speed
http://jkpeterson.net/forum/viewtopic.php?f=6&t=2496		 Page 1 of 1
Author:  Centurian57_369th [ Mon Oct 11, 2021 21:51 pm ]
Post subject:  Missile Speed
So, an interesting discovery, maybe it isn't new.
When a missile runs out of fuel, it will decelerate to 68% of its velocity and sustain that velocity until it runs out of time.
I did not test if it loses more maneuvering - might do, might not.
Either way just something I discovered.

Image

Also FYI doesn't matter what you set the min to here (even if you set it to 0), it will slow down to 68% of its velocity.
Author:  CAG Hotshot [ Tue Oct 12, 2021 06:48 am ]
Post subject:  Re: Missile Speed
You have to have the deceleration rate set and the boxes clicked for Gravity drop when Unpowered and Initial 32 fps Gravity Drop checked to have it slow down from gravity effects and drop as well as from drag modifiers when unpowered. Have you tried using the Help Files?
Author:  Centurian57_369th [ Tue Oct 12, 2021 07:52 am ]
Post subject:  Re: Missile Speed
CAG Hotshot wrote:
You have to have the deceleration rate set and the boxes clicked for Gravity drop when Unpowered and Initial 32 fps Gravity Drop checked to have it slow down from gravity effects and drop as well as from drag modifiers when unpowered. Have you tried using the Help Files?


I have indeed they're mostly vague for me to understand.
I don't think I had gravity or FPS on that one for testing, the next round I'm going to test to see if it goes below 68% with those two settings.
Deceleration rates I've always ever left at default (same for accel), never had a good feel for what those ought to be.
Author:  usnraptor [ Tue Oct 12, 2021 11:51 am ]
Post subject:  Re: Missile Speed
I hope you two are writing down notes for the manual you'll co-author.
Author:  Centurian57_369th [ Tue Oct 12, 2021 14:06 pm ]
Post subject:  Re: Missile Speed
It's why I keep posting stuff here so we have it saved somewhere.
Author:  CAG Hotshot [ Wed Oct 13, 2021 06:39 am ]
Post subject:  Re: Missile Speed
usnraptor wrote:
I hope you two are writing down notes for the manual you'll co-author.


Centurian57_369th wrote:
It's why I keep posting stuff here so we have it saved somewhere.



That is what the forums are for. That was why I had hoped to move all this dev work over to VNFAWING because I make backups of that database constantly and I know nothing is done over here very often so any crash or hack will mean all of this data will be lost for good.
Author:  Centurian57_369th [ Wed Oct 13, 2021 08:47 am ]
Post subject:  Re: Missile Speed
Zephyr did respond to a PM I sent him not too long ago (June).

Quote:
Centurian,

Good to hear from you. I am regularly backing the board up. I've been busy with other things but will look into the board issues.

- Zephyr


It's beyond my computer expertise but perhaps he'd be willing to share the backup or create another backup somewhere else or something that could be parlayed into data for VNFA?
At this point our game is 24 years old and I want to say we've all grown up quite a lot of years since then so we really ought to just combine all our efforts at this point because what's really left anymore?
Author:  Centurian57_369th [ Wed Oct 13, 2021 19:19 pm ]
Post subject:  Re: Missile Speed
So I just set the same weapon with the Initial drop and gravity drop when unpowered.
When it ran out of propellant it began to fall but speed still steadied at 1064 kn (from 1559 kn).
So it seems even with those settings, the missing just hits 68% of its velocity and that's as much as it slows down - at least in level flight - maneuvering it slows down more so I think this is a good test.

Now just to figure out what's reasonable for a corner speed.
I mean that information isn't available whatsoever, hell whenever they list a missile's speed in Mach I've always wondered at what altitude (always just presumed 36K) that correlated to in mph.
I'm probably going to just take some random - but maybe reasonable close number - on a missile and stretch that to all other missiles. Maybe it's 75% of the max speed?
Author:  Centurian57_369th [ Wed Oct 13, 2021 21:54 pm ]
Post subject:  Re: Missile Speed
Why do the missiles go to 68% velocity? Well that's why!!!

Image

Because somewhere along the way I got into the habit of putting the final speed as the same speed as max speed.
Well 1 mph = 0.68 ft/sec.

So 1795 isn't MPH in this, it's ft/sec because 1795 ft/sec = 1064 kn!

I'm almost positive I just relearned something I learned forever ago.
That explains the 68%. Well it's like learning from zero again.

So I went back to see what the help file shows and it's blatantly wrong.
Obviously this is the final speed in unpowered flight and you should enter this in ft/sec not kts.
Image

It's rather annoying that here in these speeds you have to enter ft/sec but on the movement info area you enter in MPH and it converts to ft/sec in the JT file.
Author:  CAG Hotshot [ Thu Oct 14, 2021 00:41 am ]
Post subject:  Re: Missile Speed
You need to revisit your own tips page...
Author:  Centurian57_369th [ Thu Oct 14, 2021 19:05 pm ]
Post subject:  Re: Missile Speed
Can't say I see anything in it on this stuff, in fact I see a few things that are wrong based on my own testing here.
Author:  usnraptor [ Thu Oct 14, 2021 20:56 pm ]
Post subject:  Re: Missile Speed
Maybe he meant revisit it to update it?
Author:  Centurian57_369th [ Thu Oct 14, 2021 21:34 pm ]
Post subject:  Re: Missile Speed
usnraptor wrote:
Maybe he meant revisit it to update it?


Ha - very unlikely I'm out of the website game.
Author:  CAG Hotshot [ Sat Oct 16, 2021 07:52 am ]
Post subject:  Re: Missile Speed
usnraptor wrote:
Maybe he meant revisit it to update it?


That is exactly what I meant... You sent out those tips in html format. Now would be a good time to update and correct them...
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