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Mechpit Ii: A Practical(?) Approach


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#1 Loc Nar

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Posted 06 April 2013 - 02:44 PM

(x-posted in hardware...)

This is my second battlemech cockpit simulator I've made for MechwarriorOnline. Progress stalled on my first mechpit, owing mostly to my projector dying which in turn left me having to use my normal computer 'battlestation' and monitor. This meant I needed a more practical solution that could serve as both immersive cockpit just as well as casual browsing chair without being overly bulky. I also wanted to come up with something that was easy to build so that others may build their own, along the lines of an Akers/Barnes cockpit or a SimLight, but without the design constraints of needing to fold up into a neat little pile or be all made of wood.

I did however want it to be easy to move around as well as occasionally transport and I don't want it to be an eyesore either. I also liked the way the cockpits in the old school BattleTech cartoon worked and how that type of arrangement can be used for what I am trying to accomplish. Just like my previous open mechpit, there is nothing preventing this fully self contained cockpit from being set up in an isolation pod. This means that if I ever wind up with space to accommodate such a structure, it will be a simple transition. Total time elapsed between hatching this plan and actually sitting in it for the first time was less than 24hrs, although I couldn't test drive it until the stick was installed the following day. Its been a fully functional, work-in-progress since, with many updates as of yet reflected here so I will be updating as I move along.

Please feel free to ask questions or leave comments, your feedback is welcome.


As Ikea delivered it ^_^

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I had a stack of nice 3/4" thick, 22" wide plywood laying around that was reclaimed from a failed business on Haight Street, SF. After looming in my living room for far too long, I put it to use and cut it into the stack of parts you see here.


Taking form...

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With parts propped up against the heater and bar clamps here and there, the shape things to come is a little more obvious. The empty space under the seat will be built into a ported subwoofer cabinet soon, and the plate amp will mount to the back of the chair. The sound system I will be integrating into it is a Klipsch Promedia 4.1.


It's way comfy, actually

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I was pleasantly surprised that my mock-up cushion attempt was incredibly comfortable. Even with bar clamps it's really solid. The seat base is 2" Luxfoam, but will have another 1" of memory foam before getting covered.


Dat controur!

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Browsing many pics of ejection seats and other highly ergonomic/back friendly seating arrangements showed the common trends and pointed a good place to start from. There has been and will be more refinements before the cushion is finalized, but in the meantime my back has never felt better! :)


Arm rail and end cap

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The arm rails are 4" wide and the controls mount the same way as on my first mechpit, since it uses the same controls. The little plate with the oval hole in it is the part the stick will eventually be sandwiched on with, making the stick mounting look very much like all the in-game sticks in MWO.


Joystick mounting plate closeup

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In case you still don't see it:

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This is how the stick will look when fastened by it's mounting plate.


Looking down on things

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Shaping up!

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Total time elapsed between coming up with the idea, and actually sitting in it as seen in this pic was less than 24hrs. I've referred to it as 'overnight sensation' in honor of a set of easily assembled DIY speakers a well known part supplier offers, since literally overnight had a new cockpit to pilot from.


Marked for surgery

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The hole in the deck and side wall are for mounting the stick


aaaaaaaaaand it's cut

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Caveman style. -drilled a bunch of little holes and played connect the dots with a saw, then filed it smooth(ish). Passable, but not my finest...


Temp mount is pretty solid

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Despite only one screw holding the whole thing in place. Final mount will use the thick decorative cover plate above with 2 screws, and the stick's position will be adjustable about 1" total fore/aft movement to accommodate a range of pilot's different length arms. This stick began life as a Thrustmaster Cougar, but I built a custom pitch/azimuth gimbal with no spring centering that uses absolute inputs as well as a new mechanism for the throttle, which is the subject of it's own album and well beyond the scope of this picture's description. http://imgur.com/a/ixi64

Worth mentioning... the stick uses TARGET, Thrustmaster's excellent software for it, which among other things is a fantastic kbm emulator. My keyboard and mouse are active at all times, and can be used instead of or along with the stick as needed. It should also be noted, that the stick itself unscrews from it's mount at the base, and a mousepad flips up in it's to replace it for those who prefer a pure throttle/mouse arrangement, and it's very comfortable to use either way.



Outer rail off

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Outer rail on

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which brings it much closer looking to it's "final form", although my plan is to use single pieces of 4"x2" channel rather than combining angle stock to form a similar channel.


An actual access hatch

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Initially planned on screwing it on, but needed to get in there often enough to fiddle things since with the stick is in-place, this is the most convenient location to access a few key parts, so this 1/16" thick aluminum panel will be a hinged and or have some kind of quick release someday. Till then, tape it is!


Throttle temp mount

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Like the stick, the throttle will also be mounted flush into the sidewalls, but until I make the rest of the parts that bring it out of the 'c clamp stage', it is perfectly functional just simply clamped on


A little closer

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The throw on the throttle is around 7", and the length of the arm around 10". Feels much nicer and manageable than the stock 4" rotation that uses 90deg(!) of travel from stop to stop. This throttle uses <35deg, so the buttons never get too kooked out feelling.


Independent L/R pedals

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16" on center, which makes sitting in the cockpit feel quite a bit more manly than with the pedals 12" on center like they all come from the factory. I may tie them to a central axis since in MWO analog turning is currently only available from a single pot, but if so will retain these dimensions. Fun fact: the reason peripheral companies make them 12" OC is to reduce material and shipping cost... ie profitability.


-Please- Ignore the mess!

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Preliminary test driving was a lot of fun, and spurred further refinement. The cockpit/seat is sitting on a 32" x 42" plywood base that has the pedals mounted to it., and the cockpit simply slides in/out like you would a normal chair, which allows extremely convenient ingress/egress. To achieve pedal adjustment to accommodate different leg lengths, one simply scoots the cockpit in only as far as needed. Not shown, but now has scooter wheels at the back and plastic skids in the front that make it real easy to do. I'm 5'7", but it can take shorter pilots and has worked without issues for friends up to 6'2", but could accept taller as well.


Upgrade time!

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Crude but effective method nonetheless, for those of us without milling machines and the likes, making a jig and cutting a hole with a router is still a handy trick. It *seems like it takes a long time, since 98% of the process is making the jig and setting up the tools, but then the cut itself takes <5min. The results though are repeatable, as well as much nicer than chewing it out like a beaver -the way the last one was done though...


Comparing apples to apples

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The bigger rail came out much better, and the stick also mounted right to it with no problems for fit. It's true, that by the time you finish something, you know enough to start! I was holding off on cutting my big rails until I verified dimensions, which I'm glad I did cause they ended up different sized than I would have had in the beginning. As a result, everything went better than expected.


The Inspiration Gallery:

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This is called a SimLight, it's neat little fold out integrated seat/siderails to hold the HOTAS, that replicates an F-16 cockpit as in it's simplest form. Inspirational, but in the end just too simple.. :P http://www.xflight.de/pe_sim_sml.htm



Looks great though...

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And for it's purpose, getting in/out of a LAN party in a reasonable time, it clearly the winner. I wanted something in between this and a Akers/Barnes, but I also wanted it to look cool and be easy to get in/out of.


Ahh yeah!

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#2 Loc Nar

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Posted 12 April 2013 - 12:45 AM

New side profile

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New side rails are longer and have a 60deg angle for the rear termination. Me likey. Also extended the side walls by 4", which hindsight was kind enough to show me.


Belly of the beast

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What look like bolts protruding are actually the nubs of the allthread pieces that hold it together, of which there are 3. I have yet to screw/glue it together, but need to cut one more piece to close out the seatbase for the subwoofer cabinet and I don't have the sub I'm going to use yet so my motivation is low still since these allthread pieces really hold this thing together.


UHMWPE skids on the front

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(Ultra High Molecular Weight Poly Ethylene) slide easy but have enough friction to not need pins to fix the pit's position in use, much to my surprise


100mm scooter wheels on the back

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with most of the weight on these wheels, the whole pit moves really easy and pushes out away from the monitor/keyboard with ease, and is almost as easy to scoot back in. By grabbing the seatback or headrest and tilting it back, it is easier to move around the house than most of my other chairs...


Alumnium guide rails

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catch the UWMW slides and get it all straightened out without having to manually align anything. Convenience is king!


Closing the gap

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Gap closed...

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'Normal' position

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At 5'7", if it fits me I call it normal. This is where have the seat in relation to the pedals when I am piloting mechs.


From behind

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Hi, throttle

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Hello, stick

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Pilot's view

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...sorta, no legs etc, but really if I put the cam where my head actually goes the pic won't come out due to FoV...


23" 1080p 60Hz Hannspree monitor

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Monitor, keyboard, speakers, and subwoofer are all on an aluminum plate that the keyboard and monitor jut out on. The weight of the sibwoofer allows me to cantilever the whole thing out like this, and it just slides in/out on a felt pad. keyboard rests in place and is not fastened, but can be typed on as is.


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Klipsch Promedia 2.1 speakers

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Excellent setup in case anyone is wondering. It has been made by Klipsch for a decade and they still make them. $150ish new, and competes on even footing with >$500 systems, with parts galore to keep them running. This will be replaced by the 4.1 version of it, which will be built into the pit itself at that point.


My homemade speaker stands

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I got tired of repositioning speakers everytime I moved my monitor, and needed a solution for the keyboard too. I had some 2" wide MDF scrap and put it to work along with a some square metal tube sections. Love it, and when I get a bigger/better monitor I will only need to make a new x-bar. This shot and the previous one show how the subwoofer acts as counterweight that allows the monitor, keyboard, and speakers to hang over free space and still allow typing. Makes it real easy to get in/out of this pit, which is very important to me.


Clothed

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Naked!

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Revealing the seatback to actually be a simple single plywood piece with reinforcements and some strategic contour added. It's way comfy, and already has hundreds of matches on it. Even when I accidentally fall asleep in it it don't hurt!


Scrap masonite

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Hides the uggies and I have tons of this stuff so I can remorselessly use it for templates, paneling, facade material, etc. Cutting more battletech-y shapes and gluing them on is the plan here, then some greeblies.



The headless horseman

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It's still way comfy in this configuration. Note the quick-release bike skewer through the angle aluminum seatback reinforcements, and the row of holes that allow me to attach the headrest anywhere within 3" of adjustment in 1/2" increments.

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Just goofing around with stuff

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Final form will likely be similar, and new/different headrests can easily be made as well, which would redefine how the seat looks in pretty big ways for such a small item...


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#3 CrashieJ

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Posted 12 April 2013 - 01:02 AM

quick question
"Where are the Cupholders?"

Because in a prolonged battle against an unrelenting enemy you NEED that frosty brew by your side to back you up.

#4 Loc Nar

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Posted 12 April 2013 - 01:23 AM

Quote

"Where are the Cupholders?"


Hehe... been joking about using a holesaw to cut them into the 45deg front termination caps. It's tricky work starting a holesaw cut that big on a 45, but *can be done with a longer-than-normal pilot drill, a little stupidity, and a light wrist. There are some other cupholder options I'm considering, but this is serious s*** and I gotta think this one though! :)

#5 Nakamura Takeshi

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Posted 12 April 2013 - 09:07 AM

Excellent design I applaud you, I couldn't do this myself. The only close reference besides the arcade in the Virtual World sims I use to play in. You have the HOTAS (which is superior to the VW design) in place which is great ;). The only thing that stuck out for me is the sound, maybe getting 5.1 in there somehow and not just having sound coming at your face but more true surround sound (if the game supports it). I upgraded my headphones (Boise noise cancelling) and even that little bit immerses me a bit in the game a bit more.

Again awesome job, and I wish I could pull this off.

#6 Loc Nar

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Posted 12 April 2013 - 09:44 AM

Quote

The only thing that stuck out for me is the sound,


Thanks for the kind words! You would probably be surprised at how easy the woodwork portions of this actually were, and how few tools are actually required to make one. As to sound systems, for the time being, MWO only really works properly in stereo or simulated surround through binaural surround headphones as far as I know, but I am preparing for the big transition when discrete 5.1 is the norm nonetheless! I'm a big home theater dork on top of sim stuff, so audio quality and how to achieve it is more second nature to me than even the pit work and I am fairly well versed in this stuff. If there were any what I considered *truly good 5.1 options I would go that route, but they are either lack-luster or really expensive or bulky, or all three. However, Klipsch, the same folk that make my current audio setup (Promedia 2.1 which is just my normal computer station's speakers and no slouch on it's own merits) used to make a 4.1 unit. Umm, 4.1... 'wat'? The center channel in 5.1 systems is 90% for dialog, something not even present in MWO. Any sound designated for the center is simply redirected L/R. With monitors this close (nearfield), a center channel is not only not needed, is difficult to integrate and with no clear benefits. Dropping the center speaker allows much more elegant speaker placement IMO, can be made at a fraction of the cost, and for it's intended purpose actually provides 99% of the performance a much more expensive 5.1 setup would. Even in real home theaters, more often than not people ruin an otherwise OK system with a cheap center channel. In HT, basically until your willing to go over $500 for a proper (be prepared to spend more than that!) single center channel speaker, systems typically sound much better with no center (called phantom center) since the main speakers are usually up for the task. A cheap center channel kills it IMO, mostly owing to how tuned the human ear is between 80-2000Hz, the human vocal range and how easy it is to spot deficiencies in this region. Also note, all the most expensive/high end/exotic sound systems out here are 2ch stereo, and a good 2ch will always absolutely crush a poor or even moderate 5.1.

Either way, the new subwoofer will be built directly into the base of the seat itself which will in turn provide nice tactile feedback as well, with the plate-amp mounted to the back. The front two speakers will be identical type and placement (better described as near-field monitors than speakers), but there will also be another pair for the rear L/R which will mount on stalks and be easily removable when not in use.

#7 IIASBESTOSII

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Posted 14 April 2013 - 08:19 AM

Incredible work!

#8 Loc Nar

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Posted 27 April 2013 - 01:48 PM

Here's my next installment for this pit, detailing the final mounting of the stick as well as the new armrest/mousepad assembly I finally made and documented... enjoy!

Clamped for drilling

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These 4 holes will be tapped with 12/24 threads

Stick removed for cleanup

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From here the shavings got real small so I put a bag over my stick assy to keep the grit out.

Mounting plate roughed on

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Obvious alignment issues were predictable so my original parts were all oversized slightly to allow clean trimming to fit.


Dat bevel!

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A hallmark of all things BattleTech -unnecessary 45deg angles!

With stick mounted

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It begins to look a lot more like the in-game cockpits :)

My 'ghetto mill'

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Aluminum -it's the wood of metals! I first cut the blocks on my table saw, then finished profiling them on my router table I made years ago.

Actually my second attempt

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At that piece. The first one came out below my slop tolerances so I had to redo that piece... sigh. I used a radius bit to round the ends enough for me to chuck this piece in my drill press in order to bore a true hole through it's center.

My 'ghetto lathe'

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Has been taking to a whole new level! This is the boring operation I describe above. This is not drilling, this is boring. My work is spinning and the bit remains stationary. The hole remained true, but the lack of depth to my drill's plunge required me to do this operation from either end.

Off the 'lathe' and onto the choppa

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My miter saw gets a lot more metal action than wood...


Taking form

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Although it's still not apparent, to me it's all but finished!

Sploded view

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Of my parts laid out in their orientation. The metal plate was from an old subwoofer amplifier I rebuilt into an enclosure years ago.

Close up splody

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I bet you machinists can likely spot which will be press fits and which are sliders.

Mounted and aligned

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The wood top is just a placeholder, although it works perfectly fine for a mousepad.


Flipped up

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Revealing the stick's mount

Flipped back

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By now it should be clear what is going on here, although there is no surface material on the armrest yet.

I love raw metal!

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Looking over at all this aluminum really makes me smile when I'm driving :D

Mousepad material installed

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1/4" fabric top mouse mat was my first choice material, and if it ever gets fried I have this really nice 1/4" thick solid plastic mat topped piece of pvc that also works great for a mouse surface.

Moar mouse

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This is my normal browsing mouse, a SteelSeries Kana. With only 5 buttons, it's not well suited for MWO and it will eventually be replaced by a Cyborg RAT9 or RATM.

Delicious wear marks

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In the metal bits where they rub each other. The double hinge mechanism is very robust and stiff. In either position, there is zero movement of this component.

Overhead view

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For some perspective...

Empty nest

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Flipped up

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Armrest material revealed

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I used acrylic sheet for the armrest portions. Due to the sliding nature of one's arm while on the stick or throttle, a super smooth/hard plastic actually works much better than any padded or cloth solutions.

aaaaaaand it's back.

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The beveled edges of the acrylic pads are not apparent in these shots, but there is a 45deg bevel all the way around both armrests. The extremely shiny nature of this material makes it particularly difficult to photograph meaningfully.

Stick back on

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...and ready for a match.


Mirror smooth

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Feels very nice against the skin. Since it's plastic, it immediately gets to the same temperature as your arm, making it extra comfy.


Matching armrests!

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Sort of... the throttle side is much longer since the travel of that control is longer. It's also thinner and fixed in place. When the stick's armrest is in position, the throttle's armrest lines up symmetrically with it other then it's longer tail.

#9 Sean Lang

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Posted 27 April 2013 - 08:52 PM

Pure awesome! This build log looks fantastic! I look forward to seeing this progress more and more!





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