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Archangel MK1 (Aka Matt can't CAD part 2)
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Still plenty of refinements to make, however this is the sort of thing I'm going for on Archangel. Those Hardox bulkheads are 233mm front to back and 5mm thick, will be welded together with a 30mm fixed shaft acting as the 4th wall on that inner box, if that makes sense?
Black sections are HDPE, and the box section bits are mild steel - 4mm wall, 50x60mm. Bar's 330mm now and about 4kg.
It's 530mm wide too, not including those wheels (which are only placeholders, as is the bar) - do intend to have a single toothed bar and some monstrously chunky wheels but you can get the rough idea of what I'm going for with this! Still plenty of improvements to be made, but it's on the way now to being finalised.
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I like the rear wedges / stabilisers :). There seems to be more 'dead air' than needed in that central section; I'd look at moving the bulkheads in towards the blade a bit to give you more space for parts in the rest of the frame - it won't affect the strength either way and might save weight by allowing a smaller frame. Also with those bulkheads, adding some cut-outs in the area just behind the box section will save plenty of weight with hardly any strength reduction.
Those small triangular front wedges are going to get hammered by horizontal spinners; of course if NST is retired for next year, you won't have anything to worry about :). You might still want to make them out of two layers of Hardox. The floor level front prongs are also going to be spinner bait; depending on how far out they stick, you might find floor scraping spinners like 720 will hit them before you make weapon contact. Based on fighting Demon for years, I would change the prongs to just one wider and shorter prong which will be stronger for the same or less weight.
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Thanks! I got the idea after seeing how Demon occasionally flips itself over backwards, thought it'd be handy to keep everything on the floor at least!
The plan (though I realise it's not clear in the slightest from that awful, awful CAD) was actually to have both the front and back wedge things as bolt-on pieces so I could replace them if needs be, or just do away with them entirely if fighting a drum. Would need to watch the speed of the bar though, given I'd not have the stabilisers on it!
Regards the bulkheads, I need to refine the whole weapon system so I can push them closer together, it's an NTM 5060 that and already is half sunk into the bulkhead , need to get that sorted as soon as I've refined the mounting method too (thinking an aluminium block which would then be bolted onto the bulkhead itself). I will certainly look at some cut-outs though! I'm going to attempt to learn to use a higher end CAD software that has the stress-testing function to see exactly what I could cut out without losing any strength.
Hopefully I'll end up learning to CAD properly sometime soon and can keep making adjustments but it's a lot tougher than I thought haha!
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Well, the inevitable's happened and Archangel's had to be shelved for the time being. Because 'massive vertical bar spinner' and 'student budget' don't seem to get along too well. Instead, I'll be putting HardWired 2 back in the ring. Probably with a weapon though!
On that side of things, does anyone know if there's anywhere else other than AlienPower that sells sensored outrunners? Alien's have been out of stock for quite a while now if I recall rightly, rather hoping they haven't gone out of production for good...
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I know of one other place and they have been out of stock for a year or more :(. I can't see why sensored outrunners are so scarce!
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I would assume it's because they're 'custom' (at least in the case of Alienpower) but I can't understand it either to be honest! Rather wish Hobbyking would do a range of sensored NTMs but I don't know if that'd work out cost effective for them...
Shame though, guess I'll just have to keep waiting for the Aliens to come back in stock!
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Actually, I've just seen this on there... http://alienpowersystem.com/shop/ser...nsors-service/
Not sure if this replaces the existing stock of sensored outrunners!
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Question for anyone who's relatively spinner-savvy, are inrunners or outrunners better for a small, high RPM disc?
Plan I have at the minute is to go for a 150mm OD single tooth disc, probably made of 10mm hardox 500 (or whatever gets it to about 1/1.5kg) on 20mm HDPE bulkheads (fixed shaft if possible) and I'd like to aim for around 10-15,000 rpm which might be pushing it a bit but means it'd get some very nice engagements. There are a few outrunners that would do it on the 6S I'm planning to use at maybe 1:1/2:1 sort of ratio, but is it a smarter idea to just go for an inrunner and gear down some more?
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The problem with using a small diameter disk is that there is less space to use a high reduction unless you want to risk the pulley on the disk getting hit. In this scenario, I would go for a high KV inrunner and a lower gear reduction. Will the disk be single toothed? 10K rpm and above is a bit high for a multi-toothed disk.
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Definitely single tooth, more awkward to design I guess but definitely worth the effort!
As for motors, I'd spotted this - http://www.hobbyking.com/hobbyking/s...or_2350KV.html which for, let's say a 15k-ish rpm on 5S would need a 3:1 reduction... Not sure if that'll be good enough though. I don't know how brushless motors react to overvolting either, but it could be an option to run it on 6s, perhaps?
In an ideal world I'd like to put a really small pulley on the disc and essentially hide that within the bulkheads, but it's if the reduction suits it really. 2-stage isn't that much of an option given it's going to be sitting on top of a machine that's no bigger than a postage stamp either!
