Sewdhull

The stroke is very short for a solenoid, as magnetism works best close up, like our motors ( put the magnets closer to the armature and the motor performance rises) You want something like a linear motor dragging the the piston back, but i wonder how well they miniaturise. Brushless motors are like a linear motor curved back on itself, the airsoft ones have 6 poles, but the drone type can have many more.

You should definitely try the same experiment with a lipo instead of a nimh. Also a lipo alone to see how much the caps compensate for the NiMH batteries. Conducting the experiment on the same set up allows you to compare where others would have to do the entire suite of tests from scratch. I posit there would still be some benefit to be had, esp if the capacitor esr could be reduced. Certainly you don't need that much capacitance, but the esr gets higher with smaller caps because the electrode area decreases so its tricky to find parts with small size enough capacitance and high enough rated voltage. I used anti surge xt90s on drones because of the surge of current into the electronics when batteries were connected, it was quite a pop connecting 20Ah of 26v to the things, im doubtful there's enough draw with caps, unless you get their esr down.

Lipo packs are used now to even the battery load for hi power in car entertainment. Its not my thing, but interesting none the less.

I can see why benefit is derived from the addition of supercaps with NiMh batteries, because NiMh is inferior in current delivery, by a long way in comparison to lithium batteries. I can tell you that just as lithiums have wild variance in quality, so too do Nimh or Nicads for that matter, but you'll notice it less because they are generally lower performing. I suppose what I was suggesting before was that as useful as adding caps to NiMh batteries might be there's no reason to suppose it is as well performing as a lithium, nor that there would be anything to be gained from adding caps to lithiums. You could easily run the tests to show what happens, id be interested. -Airsoftlabs is calculating the currents, from IR values derived from experimental data with a 70% variance from a simple load model and choosing the one that suits. It is important to understand that IR varies by load, time, state of charge and method used, probably some other things too. A battery isn't a resistor, proper devices measure IR taking account of battery resistance, capacitance and inductance. Certainly you could compare the same battery over time to see its health and snapshot the IR for a specific circumstance. I use my meter to monitor battery health and see if what I have bought is as good as what I have. I couldn't use the data to compare my batteries to the data sheets with any accuracy. -You wont see volt drops like Airsoftlabs says because its not possible to drop voltage and maintain the current. They are calculations from data, hypothetical. -You cant extrapolate because of the above line. -You can't make any assumptions if you are being sciency, you can measure data and draw conclusions. Airsoft labs did some cool experimentation, i wish there was more, but more sciency.

I dont need more batteries... but now im looking...

I love this kind of research/investigation. You are using the caps to compensate for the batteries and nothing wrong with that, the data says it improves them. Would you see further improvement if you used a lipo? Since you are drawing comparisons with them it would seem a good idea to find out if a super capped NiMh comes close to a lipo, or life perhaps and go some way to validate your summary, which it needs since there's some claims in it. It should be noted that the ESR for the cap pack is 300mOhms, a NiMh (9.6v) pack 60 to 100mOhms and a lipo (7.4v) 6 to 20mOhms.

Yea, when you start min maxing it's clear you are in small gains territory. Unless you can find quality bearings you are just guessing. Bushings are easy to make consistently and wear rather than fail, as are happy with loads that aren't rotational ( read side to side). Bearings, whilst efficient, have issues with loads that aren't rotational and are complicated to make. Air soft gears also tend to have variable shaft diameters which batters the bearings as the shafts wobble about. Decent cages are essential to keep the balls in place. Stainless bushings are essentially metal on metal, impregnated bushings like phosphor bronze self lube to a degree. Lubricating bushings is largely a waste of time unless you regularly relube them. Bearings are very quiet and efficient ( if you lube them correctly), shielded bearings will come lubed and you shouldn't have to touch them again. Open bearings require at least the same attention that bushings do, but they wear slowly and at low loads often don't need any lube ( lube for airsoft) Gearboxes are very quiet with bearings and it does make it noticeable when they wear, and they will keep the gears in place better than bushings as they wear. If you can fit 3mm deep bearings you are raising the load ability quite a bit and if you actually service your gun regularly you can keep the bearings in good condition. For airsoft in the UK, with our low powers and soft springs a bearing should be fine... but as Psuedo says with all the variables bushings are more reliable. If you build your gun well, use decent parts with decent tolerances, service it, which might only be some correct lube in the bearings and can detect wear before the bearing cages give way you can use bearings... I do. But I also build with bearings in the fast bits and bushings for the sector gear. If you just shoot your gun, bushings only is probably better in that case. The one thing I would say is that bearing failure is rare, they wear for sure, but failure requires the cages to collapse, which requires either a lot of wear to allow the balls to move, or uncharacteristic loads on the bearing. But quality, installation, servicing etc etc ...

You're right, it isn't important, I don't even have one. I'm guessing things like this are to make things proprietary. Clearly the third wire has no discernible function on the rif.

Most etus have some low battery detection, no need for a third wire. Say the 3rd wire has no voltage on it because you use a 2 wire battery on it, if the etu was measuring voltage it would measure 0v and the rif would not work right? Bottom line is that TM have added a BMS to the battery for whatever reason along with a connector no one else uses. Drone types do use this connector, but that's because brushless motors have 3 voltage supplies from the speed controller altho I preferred to save weight and use bullet connectors. Honestly tho, balance charging on a 2 cell battery is probably unnecessary, but still better than not doing it.

Yes, one of the posts ever made. At least we know you are human

If it were me, putting a lipo of that type in a recoiling gun, I'd pad the battery bay enough to stop the battery rattling around. I notice TM put thiers in a hard case.

So it seems the TM battery has no seperate balance connector, but it does have a Battery management system covering balance charging, over and under charging and discharging and battery temperature. What the extra wire is I dunno, or why the rif needs one I also don't know. Maybe there's a manual somewhere

I am puzzled, why didn't you put a deans on the rif instead of making 5 new connections? It's up to you ofcourse, but the mr30 is inferior to the dean's in everyway.

The only breakdowns I've had have been gas pistols, I still like to have more than one gun because it's nice to have a choice. I even have a couple of aeps if I feel the gods are against me. If I could find better parts for my aeps id probably bin the gas pistols.

The only thing gbbrs have going for them is realism. Now that can be awesome ofcourse but realism brings difficulty, aiming, ammo capacity, weight and physics issues. Gbbrs aren't that real ofcourse but you can kind of get into it and pretend. Sadly for me they cost way too much and bring too much technical difficulty. Hpa, well that just ruins the immersion for me.

Well they hold up favourable against some of the human posts I see.

The main change I have seen is batteries ( lithium instead of nimh or nicads) and MOSFET use. So far as I can tell there's been little evolution in aegs, gbb pistols seem identical, gbb rifles and hpa are more common and account I think for any progress made over the years. Oh brushless motors are finally here, not common but here.

I don't know really, probably none, altho I don't really need any of it I suppose. Just a MOSFET to protect the switch contacts. I can see fast trigger being useful regardless of the gun unless it's full auto. Much of shooting is feel, or not having to do thing and just be able to shoot. Granted in Airsoft we have few of the real problems in shooting and if it were a no brainer (thank you America) everyone would use precocking all the time.

There's loads of those pointless summary posts.

Yeah goggles or a mask for me. Asking for trouble even with snug glasses if you don't know where the damage is coming from.

I'll let you know if it's a real thing or more a feel thing. Having the shot fire immediately would feel right and be faster than one not precocked, maybe I'll measure it. Hope the motor doesn't mind.

So I have filled in a pair of cut outs so the first position on extending the stock is a useful one. I cleaned the slot, undercut it a tiny bit then used tape to hold in the epoxy on either side leaving the inner rail bit open and dribbled the expoxy in. I used JB weld. A little trimming with a knife took off any high points.

Can't really compare the two. Leviathan has better MOSFETs, more features, BT, data logging, trigger, etc etc. Perun is half the price but offers what I'm after at the moment. Sadly the leviathan can only be purchased via socom tactical minus all the normal choices you'd get from the manufacturer.

Nothing wrong with those for Airsoft. I've worn PPE for work of many types for years, goggles glasses etc. Those type you have there will stop point blank sniper fire.

I have always made my MOSFETs but have just bought a perun hybrid for my mp5 because I fancied a burst mode and precocking. It was the cheapest of those type otherwise I'd have sprung for a leviathan or just gone with my homemade one. Time will tell if it was a wise move.