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Everything posted by Rudivdk
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[TC15] Project Cockpit
Rudivdk replied to m00se's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
That's pretty nifty, nicely done! -
Thanx guys! Actually it took me only 5mins to find this solution, but I spent a good hour and half trying other similar solutions. Didn't improve so I'll stick with this. From now on most of the weight will be added in front of COG, so I think I'm good now. Might have to change the rear wheels though, in current setup they have moved one stud outwards and they will touch the fuselage I think... I'll go through my collection to see what other options I have.
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Succes!!! In the end a very small and simple redesign to the landing gear leg solved the issue. I kept the entire landing gear mechanism in place, but added a small 2x4 l-beam that secures the wheel two studs back. I might 'beautify' this later, but for now it works. I was also able to remove all added weight in the front, cleaning up that part as well. Ain't she a beauty...: Edit: one more pic, just because I can...
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I didn't measure it, but on the real P38 the rear wheels are in similar position, slightly behind the center of the wings. Since they retract backwards, moving them towards the rear will cause a redesign to parts of the tail section as well. But I already checked the current COG, it is only 3 to 4 studs backwards so it should be possible and not too far out of scale. Then again, it would probably interfere with the flaps control axle... I will first try to finish the plane as it is, I still have to add some panelling to the front and some more details, so after that is done I know how much weight or wheel redesign is needed. Worst case I can always flip the rear wheels around, making them extend backwards and thus putting them far behind COG.
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Another update: Mainly working on the 'insides' of the plane now. I've added landing gear and motorized it, with an up/down gearbox with control switch in the cockpit. I have 1 really big issue now... the plane is very tail heavy and does not stay on it's wheels. So for now I added a display stand... Will have to see what I can do later to minimize weight on the tails, but I do not think I can shave of a lot there. I already added some boat weights to the front, but it's nowhere near enough... Front wheel mechanism: This was a particularly difficult one to create, as I have my PF batterybox sitting between the gearbox and the front wheel. I only had the tip of the nose to house some mechanism, but the final solution works like a charm and is really compact. It's not very visible in above picture, I will make a 3D render of it later. Rear wheel (only one wheel connected to gearbox right now): In above pics you can also see flaps assembly: 4 flaps in total, 2 on center wing and 1 on both outside wings. They will be motorized as well, and controlled by another up/down gearbox on the other side of the cockpit: All the black/dbg levers and links running under the gearboxes are coming from the 3-axis control stick. Ailerons and elevator are already connected, rudder still to be done, but I've designed it so just need to build it. Aileron control mechanism detail:
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I have it built inside my 7 seater family car moc for over a year now, not using it regularly, but my 3 and 5 year old boys play with it now and then. Never any problems with shifting or getting out of sync. In my build it is 'encased' in a framework of 5x7 frames and beams, so pretty darn formlocked. I think the structure around a gearbox is the key for that gearbox working or not... Edit: as shown above it is really flimsy indeed, the frame is just there to put all things in place and show the POC.
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Thanx! Final result is pretty clean and simple indeed, but it was a long road getting there... I've been thinking about transverse gearbox as well, but it would introduce an extra level of complexity switching the movement of the gearlever 90 degrees towards the gearbox. And it would become wider as well I think. Maybe one day I'll attempt 1:8 scale building, then it might be doable...
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[TC15] AH-77S - HUNTER
Rudivdk replied to steph77's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Very nice heli indeed. Knowing you and your build quality, all flight controls will be there and working like a charm, but did/will you add other functions as well? -
This heli, ...ehhhr plane, ...ehhm 'thing' is coming together real fast. Did you already plan out how to go about beforehand? Or are you just this fast It is a real interesting aircraft, with a nice set of functions/controls. Best of two worlds actually. Cool that you where able to integrate flightcontrols from the cabin! But did the rudder also not make it? And what does the 16tooth gear on the back do, landing gear?
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Problem with wormgears is that in order to achieve some movement on the adjacent gear you need multiple turns of the wormgear... 8tooth gear is most responsive to a wormgear, but still needs a few full revolutions before it makes a visible movement on the output. That will be hard to achieve unless you use a motor... Thats also way I have a very hard time connecting all my control surfaces to my controlstick...
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42039 or another 42069?
Rudivdk replied to Yevhen's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Like @Erik Leppen said, it's up to personal taste. If you like exterior parts (panels etc), 42077 has the most commonly available colors ( white and dark azure). If you like technical parts, 42069 has the largest range of offroad oriented parts and a total of 6 springs, but no gearbox elements. 42039 has a somewhat smaller selection of parts, but usefull suspension parts aimed at racer type vehicles and a gearbox. And apart from the unique green, it also has quite some white panels etc. I wouldn't know which one to pick to be honest... You could also save the money now and wait for 2019 1H to be available if the new lineup has anything you like... Edit: after reconsidering, I think I would also advise 42069. 4 small turntables, small linear actuator, those springs in two types, large number of 11l axles, all new connector types, lots of black and (dark) grey elements etc is actually much more versatile as a parts pack compared to 43039 and 42077 both. -
[WIP] Airbus Eurocopter EC135
Rudivdk replied to T Lego's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
That's an iconic helicopter, I see these fly by regularly. Looks like your off to a good start, and the number of functions is doable in the time left. Would be an interesting colorscheme if you intend to replicate the Dutch police version. The yellow ADAC livery also is great btw.- 26 replies
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Grum's Shed
Rudivdk replied to grum64's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Looking really good! I bought the Porsche quite early on myself and built it from original instructions, with only Crowkillers' fix for the gear sequence. Got it to run pretty smooth by taking the same precaution as you, triplechecking every axle and gearmesh before moving further. But looking at your build, I feel I have to do an attempt at the pimped version as well. Especially the gearbox area looks way different and more interesting compared to the original. Keep up the good work, once finished you will have an excellent display piece, and one that is working flawless as well! It was a magnet to my kids, your grandchildren will love it as well I'm sure -
Wow, that is a cool control system. I especially like the mixer for the elevons in the rear, very clever compact solution! Have you built it in bricks already? I worry a bit about possible slack in the control system due to the gears, u-joints and long control axles. Hope it is still controllable, beautiful engineering nontheless
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I would love to do that, it's indeed a distinctive feature, but I set myself a goal to have all functions be controlled from within the cockpit. I am already struggling on how to fit all current functions, let alone implement yet another function in there.... Will keep it in mind though, might be doable if I make that controllable from the top of the fuselage or the center wing piece or something like that.
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Is it possible to have a subforum behave like a topic under the main forum? Meaning that any activity in the subforum displays as an unread topic/message on main forum page? This way the subforum will be actively pushed 'in sight' if any activity is there, when you visit the main forum.
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Jackpot, the batterybox is in front of the cockpit. Directly right of the cockpit on the front of the center wing piece is a PF switch (you can just see the 3l axle sticking out of the switch), which connects the motor to the BB. The motors are at the position of where the real engines would be, at the front of both fuselages just behind the prop (under the black and white panels), I had to mount them as much to the front as possible to get some counterweight to compensate the long tails. Might still not be enough... The motors will each drive 1 prop, and a secondary forward/reverse gearbox, 1 for landing gear and 1 for flaps. Gearboxes are mounted left and right of the cockpit in the center wing pieces.