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Re: Scania airport fire truck
Some clips from the first test of the roof monitor and pump mounted on the truck. Seems to be sucking air somewhere, possibly the filter on the supply side. Nozzle also needs some work.
The pump is currently drinking about 2.5 liters per minute. https://www.youtube.com/watch?v=fGMQzeoWdYY edit: if you're as easily entertained by flashing lights as I am, here's a minute of flashing blue lights: https://www.youtube.com/watch?v=q4rnpqTKm18 |
Re: Scania airport fire truck
Happy to see you’re ready for the last part of the fire season;)
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Re: Scania airport fire truck
Hopefully it's an easy fix getting the air leak repaired, & we can see some RC fire fighting action videos soon.
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Re: Scania airport fire truck
Working on the water tank. It's made from 1mm styrene and comfortably holds about a half gallon / 2 liters of water. The bottom is sloped to help the last bits of water find its way to the pump.
http://i.imgur.com/5CE0hEcl.jpg I want a large opening for maintenance access. Using a 2mm plate for the lid. I hope I'll be able to make it somewhat water tight. http://i.imgur.com/unq5WoFl.jpg The water level sensor drops down through a hole in the top. 5 wires connected directly to an arduino with its pins configured as INPUT_PULLUP. When the water reaches a powered sense wire a connection is made to ground and the arduino does whatever it needs to do. http://i.imgur.com/xYoOxhnl.jpg http://i.imgur.com/zhpoR5hl.jpg Here it is in the truck. The plan is to add another tube to the top that will let air in and out, and a tube somewhere for the fill/drain pump. http://i.imgur.com/oPlnMfol.jpg Video of sensor, tank level lights and telemetry: https://www.youtube.com/watch?v=VphOW5oXx9A |
Re: Scania airport fire truck
Got the red stripe painted and have started test printing some decals.
http://i.imgur.com/o3aYJCwl.jpg |
Re: Scania airport fire truck
How do you print decals?
Tnx |
Re: Scania airport fire truck
Sorry, I should have been more precise. I've just printed them on normal paper after making and scaling them with photoshop and illustrator. When I'm happy with them my plan is to either use printable water slide decal paper at home or have someone cut them out of vinyl for me. I have two local companies that does signs and car graphics, so I can check with them how small they can make the details.
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Re: Scania airport fire truck
Quote:
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Re: Scania airport fire truck
The quote I got for making the decals was about 100$ more than I expected, so there's a chance I might have a go at making them myself.
Meanwhile: Chest for the roof. Started by making a small table out of 2mm styrene, then wrapped it in Plastruct styrene tread plate. It doesn't open, but it's hollow so it can slide over the water tubing sticking out of the roof. http://i.imgur.com/eDe0Adol.jpg http://i.imgur.com/a9pPE1fl.jpg Started making the ladder. I was going to use precut strips for the sides and rod for the steps until I realised the total length of just the steps are more than 6 feet. Now I'm cutting strips out of 1mm styrene instead. The sides are 1x4x300mm + 2 pieces 1x2x300mm. Steps are 2 pieces of 1x3mm in 30, 36, 41, 36 mm lengths. Ladder itself is 3 elements and it rests on another element that is mounted to the roof and slides+tilts down to ground level. http://i.imgur.com/SKDGuJYl.jpg |
Re: Scania airport fire truck
$100.oo for decals, OUCH!
100ft of plastic is a LOT too! |
Re: Scania airport fire truck
Quote:
I've just ordered 3 sheets of 20x25 cm size filled with text and logos printed on clear vinyl for $30 from stickerapp.com . I'll have to cut them out myself and I don't know how thick or invisible the clear vinyl is, but I'll make sure to update when I get them. Another alternative is printable waterslide decals, but I feel those need another layer of clear coat to protect them, and I don't want to risk messing up anything else right now. |
Re: Scania airport fire truck
:jaw: Skills here are incredible. Matching bodywork and curves like this is amazing!
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Re: Scania airport fire truck
Thank you!
Ladder progress. I'm not sure how the pulley system works on the real one, so I don't know if I'll make it functional or just glue everything together. http://i.imgur.com/4nsaL0Vl.jpg http://i.imgur.com/lQ2UbOtl.jpg I think I finally found the perfect water tubing for the monitor. 3mm ID, 5mm OD, 1mm wall thickness black silicone tubing. I tried 0.5mm wall thickness too, but that was way too thin and would kink at almost any bend radius. This one doesn't kink but is still very flexible and won't stress the servos. http://i.imgur.com/g8hMHz6l.jpg |
Re: Scania airport fire truck
Glad to hear it works right, and the black monitor tubing looks good on there. What use was it originally intended to have?
It's come this far, got to make the extension ladder work... I'm assuming ground ladders? Is that like a single 3-fly ladder with a support base, or a pair of 1-fly ladders? |
Re: Scania airport fire truck
It's apparently nitro fuel tubing, although I've never seen anyone use black fuel line in an rc car, and I've never seen these dimensions. https://www.ebay.com/itm/401073783505
As far as I can tell, it's one ladder with 3 sections. Some kind of pulley system mounted to the side, a pair of spiked feet that digs into the ground and a pair of long support legs that can fold out from the sides. A short section is mounted to the truck and can tilt up. The final section seems to be mounted to the tilting bit and can slide out and down towards the ground. I think the ladder is then just strapped to this sliding section. I'm having trouble finding reference material of it in use, but here's one image.(Image of aftermath of house fire, noone physically harmed)https://www.folkebladet.no/nyheter/a...leks%20Olsborg Better image of the truck mounted section extended, and a video that I just now discovered of that part being retracted by a firefighter: https://www.sa.no/varteig/nyhet/matt...n/s/5-46-50230 |
Re: Scania airport fire truck
Finally found the ladder. Wibe NOR-BAS. Here's a spare parts pdf with good drawings of the ladder and pulley system. Maybe there's hope of figuring it out now.
http://www.wibeladders.no/globalasse...parts-list.pdf Edit: and here's even a video demonstrating how to use it. I love how you can look for something for months on the internet with no luck, and then suddenly you find that golden clue and everything turns up. https://m.youtube.com/watch?v=LrFnRqdL4rU |
Re: Scania airport fire truck
Got started on the pulley system. Still not sure if it will actually work, as there will probably be too much friction in those tiny pieces. And I'm 99% certain that the rope actually passes through one of the steps to go from the right to the left side at one point, so I might have to simplify that.
It's also one of those fun situations again where I can't paint it until it's finished, but I can't disassemble it to paint it after it's done because of interlocking pieces. http://i.imgur.com/auWFZ9ol.jpg http://i.imgur.com/JBzB75Il.jpg |
Re: Scania airport fire truck
A lot of friction, but it's working!
https://youtu.be/u6E1-i7fYuM The people who designed this ladder are a lot smarter than me. The pulley system for the bottom/middle section has a 2:1 reduction ratio with no loose rope ends. It starts attached to the lower left of the middle section, then loops through a pulley on the upper end of the bottom section, goes down to a pulley on step 2 of the middle section, through the step to the right side, through a pulley there and up to a pulley on the top of the bottom section. Then down to a double pulley on step one of the bottom section, up to a pulley on step 2 of the middle section and back down to the double pulley on step 1 of the bottom section before it ends attached to the middle section right side. Simple, right? |
Re: Scania airport fire truck
Now it's back to the "how did he do that" level of awesome! The ladder reeving sounds like a headache to set up. I used a razor perpendicular to the work to adjust some sticking points on the FWD extension ladder, but it's much simpler...
If you say the ladder were to have been powder coated aluminum, it wouldn't need painted. |
Re: Scania airport fire truck
Got the ladder smoothed out a bit, so it's actually not too bad now. Currently working on the part that's mounted to the roof.
Got the stickers from Stickerapp. I expected it to be printed in the US, but I'm not actually sure where they're from. I ordered them from the Scandinavian version of the web store (stickerapp.no). I got a shipping notification from USPS with a tracking number after a few days, but the tracking info only shows that a shipping label was made. Turns out that the very same day they actually arrived at my local post office in what seems like a Norwegian cardboard envelope with a different tracking number. Quality seems very good. They're printed as a single large sticker on clear vinyl like the Tamiya decals. Neither my vernier caliper nor my digital caliper can tell a difference in thickness (0.1mm), but the Tamiya decals are much more stretchy and somehow feels thinner. The clear vinyl in the Tamiya decals are maybe a very tiny bit more clear, but it's on the order of 97% vs 99% transparency. Print quality is very good. Blacks look about 5% lighter than the Tamiya ones. Colors look like I expected. Most importantly, the size is pretty much exactly as ordered. What I did to make them: I measured the size of the decals on the truck and on photos. I used Illustrator and made the text and numbers with the type tool, imported logos found on the internet, traced them if they weren't in vector format and modified them if they were not accurate (like adding "austria" to the Rosenbauer logo). I made the artboard 20x25 cm and added a thin border around everything to help mark the exact size. When I was happy with everything I used the stickerapp web store, selected a custom 20x25 size, imported the illustrator file and resized it so the border matched the template. For info, 3 identical sheets cost me about 30 USD shipped. http://i.imgur.com/m3HRoPOl.jpg Quality example: The smaller of the computer thingy is 14mm wide. The smallest visible text near the knife "BRANNTEKNIKK AS" is 0.7mm tall and looks good. http://i.imgur.com/1mBFezul.jpg The Rosenbauer logo is from stickerapp. The Tamiya logo on the right is from the Tamiya decal sheet. http://i.imgur.com/Ew5ta1rl.jpg Tried cutting away the clear vinyl around the text. http://i.imgur.com/VqetWjtl.jpg Used a weak masking tape as transfer tape. This is my first time trying this. http://i.imgur.com/DNYcVGfl.jpg http://i.imgur.com/3PK1yu2l.jpg Applied to the truck on the second attempt (Had to scrape off 3 letters very carefully and reattach to the tape after I accidentally touched it to the surface. It's almost straight! http://i.imgur.com/mcTL44Zl.jpg Air force bird logo. http://i.imgur.com/0rLzvAPl.jpg |
Re: Scania airport fire truck
Looking good!
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Re: Scania airport fire truck
Finished the top of the light mast. Plastruct diamond tread plate on top. Front part of the lamps: Sanded lexan as glass surrounded by 0.5mm styrene strips with 24AWG wire as bars. Painted with primer -> gloss black -> TS-17.
http://i.imgur.com/1j78jrjl.jpg http://i.imgur.com/4cc795bl.jpg |
Re: Scania airport fire truck
The light mast and ladder both ended up a bit too wide, so I've very carefully cut out some support pieces to shrink the light mounts. I'm very happy with how the paint finish ended up on these.
http://i.imgur.com/8eF0Eq5l.jpg http://i.imgur.com/wXfPM6yl.jpg Made a joystick and control panel for the cab interior. http://i.imgur.com/5PDtqHol.jpg http://i.imgur.com/yBr3Lx1l.jpg The control panel / display is a box with a 3528 LED with a transparent plastic piece and reflective tape to spread out the light, and a sticker on the front. http://i.imgur.com/FZmIWXbl.jpg The joystick paint doesn't look super clean in this shot, but it's tiny and looks fine in real life. For reference, the control panel is 14mm wide and the widest part of the joystick is about 5mm. http://i.imgur.com/VdusJK6l.jpg |
Re: Scania airport fire truck
The light mast looked good, but that remote station for the cannon is absolutely killer!!!
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Re: Scania airport fire truck
Very nice
Great job. |
Re: Scania airport fire truck
It's a bit rough, but I don't think I'll dive deeper into the details than this. Obviously missing a steering wheel and gear lever.
I'm no expert, but I believe the main joystick has all the relevant controls for the big monitor on the roof. The small stick would be the small monitor on the winch platform? The display / control panel shows info about and controls all the added functions on the truck, like emergency lights, flood lights, siren, pump, tank levels, and so on. In addition to that there would be a portable remote control for the winch and optional jet fighter rescue platform (which this truck does not have), which I have yet to model. http://i.imgur.com/pE9bS6nl.jpg |
Re: Scania airport fire truck
http://i.imgur.com/KXmrdQkl.jpg
The dash panel sticker is mounted on a 0.5mm styrene plate which diffuses the light nicely, but that unfortunately means the turn signal indicators look lit even when off. Will have to fix that. The switches are painted with liquid chrome and white paint, but the next build I'll definitely add light boxes to the whole panel after seeing how good the hazard light switch accidentally looks as it's right on the border of the backlight for the gauge panel. http://i.imgur.com/MWqDcA0l.jpg |
Re: Scania airport fire truck
I've been looking for wheel hubs for the rear wheels, but never found a good match. Turns out the truck has reduction hubs, with planetary gearing inside, and that's why they're so big.
https://www.scania.com/group/en/wp-c...res-033241.jpg I've also been looking for a better match with the wheels. I believe Tamiya's rear wheels are made to match the front wheels of the American trucks like the King Hauler, and after some research I believe those are modeled after 24.5 inch wheels with a 285.75 mm bolt circle. That means the scaled down bolt circle is very tiny compared to the European style 22.5 inch wheels with a 335 mm bolt circle that I'm using for front wheels. The real fire truck uses 20 inch wheels, so the perfect scale version would probably use 1.55 rims, but I'm not going to get custom wheels 3d printed and cut down the tires. What I will try is to do some basic modifications to the Tamiya rims. I've mocked up a couple of different sizes of the hub to find a good looking compromise between what's actual scale and what looks scale. http://i.imgur.com/ATKoELil.jpg (And for reference from the first page: ) http://i.imgur.com/ctpy2rFl.jpg edit: I think this will work http://i.imgur.com/uL2f6PNl.jpg http://i.imgur.com/u4E3Za0l.jpg |
Re: Scania airport fire truck
An eye for details :)
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Re: Scania airport fire truck
I've spent a lot of time playing around with building a sound unit, so there hasn't been a lot of updates to the build. I never planned to use a proper sound kit, because I was never convinced they sounded good enough to be worth the price, so I didn't design a space for it in the truck. This winter I found an open source engine sound project, using an ESP32 microcontroller to play multiple sounds together with the engine sound. It's also in control of the ESC signal, so the truck has a simulated inertia, with slow acceleration and coasting.
I liked it better than the TBS/Dasmikro/Benedini micro sound unit out of the box, so I started to play around with modifying it to my use. I've now coded in an approximation of an Allison automatic gearbox, so it sounds like it's changing gears, and I've added recordings of two Norwegian sirens (a fast one and a slow one). Because it's now in control of the ESC, I was also able to code in a function that lets me switch between reverse and forward mode with a separate transmitter switch, while keeping the brake function of the ESC. It works by sending a "double tap" of backwards input to enable reverse mode, and staying in backwards range when the switch is flipped, and makes sure to blip the throttle in normal mode when coming off the brake, to ensure it doesn't accidentally enter reverse mode when it shouldn't. This is what it currently sounds like: https://www.youtube.com/watch?v=9ex9XDmr8_Q& Short test drive: https://www.youtube.com/watch?v=qc6XIntvkuc Youtube channel of the original author of the project: https://www.youtube.com/user/TheDIYGuy999 And the original code: https://github.com/TheDIYGuy999/Rc_Engine_Sound_ESP32 My poorly documented and highly specialized fork of the code, for anyone curious: https://github.com/Wombii/Rc_Engine_Sound_ESP32 I managed to squeeze the controller and amplifier under the rear bench in the cab. The amplifier has a volume pot sticking out under the cab floor. Well hidden, but usable without opening the cab. http://i.imgur.com/jm3lue2l.jpg I also made a custom telemetry screen for the transmitter. Here's a shot of that, with an overview of my control layout. http://i.imgur.com/lDhw4zWl.jpg After some digging, I was able to find the correct SCBA fixtures / rear seating. Here's a nice reference pdf from Rosenbauer: https://www.rosenbauer.com/fileadmin...A_fixtures.pdf 1mm + 2mm styrene sheet with the Tamiya seat as size reference: http://i.imgur.com/HCxeRxYl.jpg http://i.imgur.com/HCEv17jl.jpg Mounted using magnets and shims http://i.imgur.com/B6dn42Yl.jpg http://i.imgur.com/MvrWkzhl.jpg Most of the interior is now painted. Still needed are some hand rails, door panels and rear bench. Very happy with how much the locker box between the front seats looks like painted metal. I painted the seats with a brush because I wanted a slightly worn look, but I went a bit too rough, so I might have to do another coat. http://i.imgur.com/4Kj2OfXl.jpg http://i.imgur.com/51hNNurl.jpg Warm white cab dome lights when ignition is off http://i.imgur.com/iu5Lsrpl.jpg http://i.imgur.com/14pPJiCl.jpg http://i.imgur.com/5lvSRmal.jpg Low intensity red lighting when ignition is on http://i.imgur.com/xI4vNb6l.jpg |
Re: Scania airport fire truck
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Re: Scania airport fire truck
Some more wheel hubs. Rear:
http://i.imgur.com/k4FRmbIl.jpg http://i.imgur.com/XjPzohll.jpg Front: http://i.imgur.com/zjqYgVRl.jpg http://i.imgur.com/ZUivwljl.jpg http://i.imgur.com/b7WXCwol.jpg I made them so they screw onto the end of the center axle bolt, to cover the wheelnut, but if you're smarter than me you will of course know that the bolt and nut on the non-driven front axle doesn't actually rotate with the wheel, so I might have to find a low tack glue and stick them to the rim instead. I've been trying to come up with a simple way to add baffles to the water tank without ripping it apart, and I spotted some spare separators from some component / assortment boxes. Perfect fit, can be assembled inside the tank and are easily removed for maintenance. Video: https://www.youtube.com/watch?v=m6BDHUII7Jo Bonus picture. It's odd how small details change the whole truck. The black wheel hubs helps a lot with making it look heavier, and makes the wheels look less like plastic: http://i.imgur.com/ZOqYhXLl.jpg |
Re: Scania airport fire truck
Spectacular !
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Re: Scania airport fire truck
Exhaust pipe. Styrene tube with Tamiya primer, then a smooth coat of Motip gloss black as base for the silver. Top third is then sprayed with Tamiya TS-85 Rubber Black and the bottom half a light dusting of TS-30 Silver leaf. I'm starting to see that I would really like an airbrush instead of spray cans for my next build.
http://i.imgur.com/iDamQXFl.jpg http://i.imgur.com/fcfxxHal.jpg I've also started on some shackles for the rear end. Yes, scale shackles are cheap on ebay, but it's hard to find accurate measurements for most, and it's fun to try and make stuff even though I'm finding I don't have the patience for doing metalwork properly. http://i.imgur.com/hmVO5o3l.jpg http://i.imgur.com/ML6v5ujl.jpg http://i.imgur.com/M2C2n8ol.jpg |
Re: Scania airport fire truck
Your patience is top tier :D
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Re: Scania airport fire truck
You've got more patience than you give yourself credit for! It is extremely difficult to make a matching set of shackles.
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Re: Scania airport fire truck
Tank internals. The black stuff around the edge is a thin rubber or silicone sheet with adhesive backing.
http://i.imgur.com/eBCs2FAl.jpg I wanted a way to access the tank without removing the roof plate so I stole a screw top off a juice or milk carton and made some holes. http://i.imgur.com/rpnvCQOl.jpg Hot glued on the inside of the tank lid. http://i.imgur.com/28AfnZPl.jpg Very low profile, but just enough grip to unscrew it. http://i.imgur.com/agReRZGl.jpg It will be hidden below one of the tank inspection hatches. http://i.imgur.com/KHCbjtvl.jpg I had to do a lot of guesstimation as I don't have any good direct reference shots, but the end result is passable from a distance. (Top left is the model, the rest are all the reference material I have. http://i.imgur.com/yI9vGPql.jpg |
Re: Scania airport fire truck
Blind spot mirrors and front work light. The work light seems to be mounted on the sun visor on most Norwegian fire trucks, but looks like it's mounted on a plate sticking out from the roof platform on the RNoAF one. This is the only non-functional light on the model because when I planned this out I didn't actually know that it was a light. Carved and sanded from a few layers of styrene. The reflective part is from a roll of a sort of self-adhesive home interior vinyl (d-c-fix) that will last me several life times at this rate.
http://i.imgur.com/Nn5L6nnl.jpg http://i.imgur.com/mB9kWg4l.jpg http://i.imgur.com/LUX5MHPl.jpg |
Re: Scania airport fire truck
Emergency stop button for winch/hydraulic rescue platform if mounted and activation switch for remote controls.
http://i.imgur.com/qHWWJE9l.jpg http://i.imgur.com/NJ4nPyel.jpg Driver's side external start button. The driver can hit this button while getting dressed and jump into a ready to run truck. http://i.imgur.com/cJHBJL2l.jpg |
Re: Scania airport fire truck
Such attention to detail, I don't even know how you even handle something that small. I like your reflective material, I tried something like that with some silver mylar ( actually a poptart wrapper) the first attempt didn't work so well I'll probably try it again at some point.
Very impressive truck..!! |
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