Author Topic: Falcon 9 v1.1 build (3D Maya)  (Read 23176 times)

Offline Jamie T

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Falcon 9 v1.1 build (3D Maya)
« on: 02/02/2015 10:47 PM »
Hi!

I'm looking for some guidance in accuracy as I go about building a scale (in 3D) version of the Falcon 9 v1.1 rocket..

So far I'm in very early stages but will make further progress shortly

Firstly I'm getting conflicting information about the dimensions of the thing. In particular the height of 68.4m taken from the Spacex site.

As you can see here lined up against the graphics from the spacex site..



the heights on the right are taken from http://www.spacelaunchreport.com/falcon9v1-1.html

with exception of the whole stack.. again conflicting
Falcon 9 v1.1 (Merlin 1D) >2013? with 2 Stage Falcon 9 v1.1 (Merlin 1D)
+ 3.6 m or 5.2 m PLF   at 69.2 m


So I'd like some input on what is the deal with the conflicting measurements?

i.e. clarification on each stage.. height of 1st stage plus engines and interstage.. height of 2nd stage excluding dragon or fairing..  dimensions of dragon and fairing (normal or stretched?)

Thanks in advance


Jamie

Offline Ronpur50

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #1 on: 02/02/2015 11:23 PM »
Oh, the dimensions of a Falcon 9!!  What a problem that has been.  I ended up using the ones from the space launch report site too.  But, I mostly have been just scaling my models off of photos, since we know that it has a 12' diameter.  Maybe we will get an official plan with all dimensions on it someday and I can go back and cut my models apart and fix them. 

I don't know if my thread will be of any help to you, since I deal in plastic, not computer models.

http://forum.nasaspaceflight.com/index.php?topic=32895.0

Offline Bynaus

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #2 on: 02/02/2015 11:24 PM »
I think you can get (almost) 68.4 if you add up 42.6 (1st stage) + 12.6 (2nd stage) + longest payload fairing 13.1 m. The rest are rounding errors. Note that the hight of the 1st stage (42.6 m) is without interstage according to the website you linked. Also, the diameter is given as 3.66.
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Offline Jamie T

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #3 on: 02/03/2015 12:39 AM »
Thanks for the input guys..

ok I've revised the measurements based on photography of the actual stack on the pad..  one good photo to work from zoomed in from a distance with minimal perspective distortion..



Basically the measurement from the spacex site is correct.. their graphics however are wrong..  maybe some artistic license from their graphic designer to fit it on the website..

so I think I'll go with these base measurements and refine from there..

Offline Ohsin

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #4 on: 02/03/2015 05:35 AM »
Hi

Thanks for starting this thread ! I was meaning to start this Falcon 9 v1.1 measurements thread for a while kept procrastinating :P.

Like many other I have attempted to get the dimensions using photo references to verify SpaceX numbers made available on their website. I too found out graphics are wrong but reached the same conclusion as you that other numbers are probably correct.

I think you made a mistake in your graphic 49.1 m is wrong probably just a typo.

I used excellent photographs taken and generously made available by Helodriver and JimNTexas for reference. Here are my numbers that are very close to yours. I used 12 ft width as basis to measure everything.

Stage width    12 ft
Fairing height  42.92 ft  or  13.08 m
Fairing width   16.93 ft   or   5.16 m

Interstage       19.51 ft   or   5.95 m

Top of 'First stage + Interstage' to bottom of peripheral engine = 153.04 ft   or   46.65 m

Top of 'FirstStage+InterStage' to ground(Legs deployed) 158.64 ft   or   48.35 m

second stage (minus fairing) = 27.59 ft   or   8.41 m
second stage (with fairing)  = 69.65 ft   or   21.23 m

Total 69.65 + 153.04 ft =  222.9 ft   or   67.94 m

So 0.46m error to 68.4m official height. Add to this middle engine extrusion that we left and ~Close Enough~


I am curious about leg dimensions! I'll post mine later on.
« Last Edit: 02/03/2015 06:07 AM by Ohsin »
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Offline Hobbes-22

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #5 on: 02/03/2015 07:19 AM »
I've done some measurements off photos for my 3D printable models. The results are listed in the instruction PDF you can download from: http://www.shapeways.com/forum/index.php?t=msg&th=14981&start=0&

For F9v1.1:
first stage (full length of the stage) 41 m
interstage  6 m
2nd stage 8,3 m
Dragon trunk 2,8 m
These are 1 m due to distortion in the photos I used.

For F9v1.0:
first stage (full length of the stage) 31 m
interstage  6,4 m (although some flights used longer interstages)
2nd stage 4,6 m

All these are derived from the only measurement known with any accuracy: the stage diameter of 3.66 m/12'. Lengths quoted on the SpaceX website are way off, and so are the drawings on the site.

I'll check my notes for the length of the fairing, but IIRC I just used the data found in the F9 user guide.
« Last Edit: 02/03/2015 07:49 AM by Hobbes-22 »

Offline Jamie T

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #6 on: 02/03/2015 09:38 AM »
Cool! Thanks for additional measurements Hobbes!

Yeah Ohsin the length of the 1st stage tank is what it is based on the photos.. but anyway I'll refine as I go..   meanwhile I modelled the legs up in a suitably dodgy way.. and threw in some joints for good measure.. animatable!

So now have very rough guesstimates of heights while walking..  of course with and without the 2nd stages.. :D



As for my height while walking it's probably way on the high side.. I did find this good photo of one leg deployed in the spacex factory.. and given the scale.. it looks like you could just walk underneath the engines and have a sniff..

« Last Edit: 02/03/2015 09:51 AM by Jamie T »

Offline Ohsin

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #7 on: 02/03/2015 11:25 AM »
Here are a bunch of references for 'raw' leg

https://www.flickr.com/photos/jurvetson/9848223155/
http://farm8.staticflickr.com/7299/13138831323_9d00b26383.jpg
https://www.flickr.com/photos/jurvetson/11360768016/in/photostream/

https://pbs.twimg.com/media/BJSV3UQCAAITfKN.jpg:orig
https://pbs.twimg.com/media/B5LZYrdCQAAAJeR.jpg:orig
https://pbs.twimg.com/media/B5LZXzeCEAIuSeQ.jpg:orig

imgur.com/a/92rC5 has a leg being transported by road but I think there is something weird with its attachment points position on side.

Also this thread might be of some use http://forum.nasaspaceflight.com/index.php?topic=33788.0

Taking 6ft radius leg width would be sqrt(72) i.e. 8.485 ft  height is tricky.. if I treat it as 30' from raw tip to hinge, then angle of leg while deployed is 22.5 degrees and telescopic struts at 45 degree which appears rather nice and precise :P the hump on leg should be so that  when retracted it is parallel to body and end tips should be parallel to ground when deployed ... I have no measurements yet though.

Edit : Added correct image

« Last Edit: 02/03/2015 02:56 PM by Ohsin »
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Offline Prober

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #8 on: 02/03/2015 11:37 AM »
Thanks for the input guys..

ok I've revised the measurements based on photography of the actual stack on the pad..  one good photo to work from zoomed in from a distance with minimal perspective distortion..



Basically the measurement from the spacex site is correct.. their graphics however are wrong..  maybe some artistic license from their graphic designer to fit it on the website..

so I think I'll go with these base measurements and refine from there..

Looks like some real nice work you have going there.  You planning on making the launcher snap fit for the 2nd stage?  Don't think anyone has done that yet for a Dragon/launcher combo. 

If you plan on 3D printing this, make sure you try and design for the printers (it will save you money)  This is one way...http://www.thingiverse.com/thing:25557/#instructions

Note: in the instructions Has 3.5mm holes for centering pieces when gluing up.

=======================================

The other method is the so called "snap fit"  can't find the linkage but its basically a tab on one end and an rectangle on the other piece.  It works real well.

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I have not failed. I've just found 10,000 ways that won't work. ~ by Thomas Alva Edison

Offline Jamie T

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #9 on: 02/04/2015 06:56 AM »
Ok..  quick test of the landing gear deploying..  it was pretty tricky getting the tolerances right in the model..  SpaceX hasn't left alot of room in the legs for the telescoping arms..  they barely fit.. must be only centimeters covering them..
[youtube]ACGTkh_NXvc[/youtube]


As for the model detail.. the legs are close to the actual thing.. the telescoping arms are in five sections and deploy as expected.. as for the piston at the end (polished one) I'm leaving that already extended.. before the deploy..

So I've based all the hard mount points on the only flight of the F9R..  not sure if this is final flight hardware for the landing leg assembly thou..  the telescoping pistons are of considerable girth.

« Last Edit: 02/04/2015 07:00 AM by Jamie T »

Offline jgoldader

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #10 on: 02/04/2015 09:33 AM »
Would love printable 1/144 legs, folded and deployed both!
Recovering astronomer

Offline Prober

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #11 on: 02/04/2015 01:11 PM »
Would love printable 1/144 legs, folded and deployed both!

What color would you like those printed in?

me bad  ;D
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Offline Ronpur50

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #12 on: 02/04/2015 09:40 PM »
Would love printable 1/144 legs, folded and deployed both!

What color would you like those printed in?

me bad  ;D

Color wouldn't matter to me, lol.  Scratch building 4 nearly identical legs wasn't easy in plastic.

This is looking awesome!

Offline tea monster

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #13 on: 02/04/2015 11:28 PM »
Really nice work there!

Offline Jamie T

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #14 on: 02/05/2015 04:12 AM »


More refinement to the legs completed.. plus some of the sub assembly..  the top latch.. the reinforcing brackets along each side of the leg.. and some air scoopy thing that does whatever its supposed to do..

Kinda getting all tripped up on the bottom hinge assembly.. the pivot points look offset and angled in the photo.. but they can't be as that wouldnt even swing open.. thoughts welcome on this one..  I also have no doubt this is where they'll bolt/chain the thing down on the deck when it lands on that sea platform..

« Last Edit: 02/06/2015 06:37 AM by Jamie T »

Offline jgoldader

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #15 on: 02/05/2015 09:39 AM »
Would love printable 1/144 legs, folded and deployed both!

What color would you like those printed in?

me bad  ;D

No preference, I'll be priming and painting anyway.  As Ronpur says, it isn't fun trying to scratch 4 identical, symmetric legs.  Bleh.
Recovering astronomer

Offline Jamie T

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #16 on: 02/05/2015 10:53 AM »
Anyway.. built some of the barge.. to scale



and I'm hating maya more and more.. loves to crash!
« Last Edit: 02/05/2015 11:14 PM by Jamie T »

Offline DatUser14

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #17 on: 02/05/2015 01:00 PM »
Ooh, that ASDS would look good in KSP.
Titan IVB was a cool rocket

Offline Ohsin

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #18 on: 02/05/2015 01:31 PM »
Looking Nice!  ;D I think hinges are 90 degree to each other. What height you settled at for legs? Do they make a squarish profile from top view and is their spine parallel to body?

Also if you attach your images instead of embedding them it wont break page or you can use 'img' tag like this
<img width=640 height=480>
or just for width
<img width=640>
replace <> with []
to fit images nicely

 attaching is preferred though.
« Last Edit: 02/05/2015 01:34 PM by Ohsin »
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Offline tea monster

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Re: Falcon 9 v1.1 build (3D Maya)
« Reply #19 on: 02/05/2015 07:53 PM »
Looking good. Love the animations. Are you going to be doing the different staging at all?

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