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About sonar
- Birthday 05/24/1985
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Technic
Profile Information
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Gender
Male
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Location
Vilnius, Lithuania
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Interests
Electronic music, anime & manga, PC gaming.
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sonar changed their profile photo
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[HELP] Building an RC Tank
sonar replied to Kelso's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
My advice would be to roughly build whole tank without motors for the propulsion. Then according to the weight of the model you add either 2, 4 or more XL motors. At minimum you should use XL motors (NTX, EV3 or RC buggy are better). Neither Large nor Medium motor is powerful enough to move tanks around reasonably fast. By fast I mean faster than big construction models you see in this forum. Tanks ar not construction equipment. They must go fast! -
[HELP] Tank Width
sonar replied to oracid's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
The width of any tank is determined by the turret ring in my opinion. If you examine real tanks you could see from the moment the Main Battle Tank concept was developed, every tank uses the hull as wide as the turret ring allows. This is always a balancing act from tank development perspective: the breech of the main gun increases the size of the turret ring the higher caliber of the gun goes, the smallest frontal profile is desired which is achieved by decreasing the turret ring. If you plan on adding turret with mechanisms inside it, I would suggest taking into account the space between tracks these mechanisms will take when turning the turret. I'd suggest examining Kelkschiz Mark 6 Autoloader Tank to see the modern real life tank development concepts applied using Lego. -
LEGO - Tank climber test
sonar replied to oracid's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Thank you for your updates on the research. That is an excellent solution! -
Planetary Wheel Hub - Please Help
sonar replied to PlanetaryHub's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
My thoughts exactly. The combination of wheel hub and sprocket into one part is a very very good idea. -
LEGO - Tank climber test
sonar replied to oracid's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Another excellent video! Also these window seals can be found made of different materials and the grip between surface and tracks could be adjusted accordingly. Might I suggest increasing weight of the model and testing the performance. Right now these are just bare bones of any tracked vehicle. In my experience even dual XL motors struggle on the finished model when I add body and other mechanisms (pneumatics, compressors and what not) to the similarly sized vehicle. Adding another kilogram could change performance drastically I think. -
New Track Rubbers Test
sonar replied to KirTech LAB's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
From my experience you need to decrease traction between ground and tracks for tracked vehicles. Increased traction eats away too much motor power to the point where the vehicle even struggles to make a turn. This kills off ability for a model to turn around on it's own axis ( ) assuming the model is in the 3-5 kg weight class.Either way I prefer performance on even terrain over steep climbing abilities like demonstrated in the video above. Few thoughts from my point of view. -
Cleaning LEGO "aggressively"
sonar replied to miguev's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
I had success removing sticker glue with WD-40. I was cleaning glass jars though. Not sure if WD-40 is harmful to plastics. Spray the lubricant on a paper towel, press it against the area with glue and let the glue soak it in from the towel. After couple seconds wipe it all off with the towel. Obviously the part needs to be washed with soap to remove the lubricant. -
[HELP] Universal Tank Chassis
sonar replied to Kelkschiz's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Thanks for the update. The Mark 6 is very innovative in Lego tank design in my opinion. Looking forward to your next creation. -
[HELP] Universal Tank Chassis
sonar replied to Kelkschiz's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hello, Kelkschiz. How's progress on Mark 7 Autoloader tank (if you are still upgrading Mark 6 version)? -
Cadmium - Bouncing Lowrider
sonar replied to mahjqa's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
The video composition and camera shots are very good! -
Modular future combat drone
sonar replied to Samolot's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Awesome MOC. The tracks look very cool. I wonder, what part is used as a sprocket? The track would slip without a sprocket I believe. -
[LDD Idea] Spinning Gyroscope
sonar replied to sheo's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Reminds me of the Machine from one of my most beloved sci-fi movies - Contact. Please post a video of this mechanical sculpture if you can. Would like to see it in action. Edit: just got an idea. Maybe it helps you. You could simplify the contraption by using rectangular frames instead of circular frames. It should work the same. -
Problem with Old Style Pneumatic Cylinders
sonar replied to Freekysch's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
How about putting them in hot vinegar for couple of minutes? The chemical cleaning should be safer instead of mechanical abrasive cleaning like sanding and polishing. It works for cleaning pennies if I recall correctly. -
LEGO Tank Suspension Types Video
sonar replied to Kelkschiz's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Yes the leaf spring suspension is different because unsprung suspension elements mount directly onto the leaf spring. This system is different. The rest work on the same basic principle: coil spring element on one end of the swing arm and roadwheel on the other end. One coil spring + one swing arm - basic trailing arm suspension. Combine bogie suspension with two trailing arm suspensions - you have VVSS suspension. Change direction of the coil spring - you have Christie suspension. Mount two Christie suspensions back to back - Horstmann suspension. Replace coil spring of trailing arm suspension with torsion bar - you have torsion bar suspension. All of these work on the same principle. -
LEGO Tank Suspension Types Video
sonar replied to Kelkschiz's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Well these cylinders look big enough to fit only in the biggest models. Besides any use of spring elements is by definition a Christie suspension. What I am thinking as Hudropneumatic suspension is all pneumatic cylinders for every roadwheel connected into one closed pneumatic system. But I guess it is not so easy to pull off.