Fatboy40
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- Mar 25, 2021
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A Maple Leaf Macaron 60 Degree and Omega nub are playing nicely in my stock DE M904E hop unit ?
Double Eagle M908B
- Thread starter JakeF
- Start date
A Maple Leaf Macaron 60 Degree and Omega nub are playing nicely in my stock DE M904E hop unit ?
RostokMcSpoons
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- Sep 3, 2021
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Ok, next thing is my rate of fire does feel really chuggy when I'm dry-firing it.
I'm comparing it to my CA M16 which quite frankly sounds like it's got a mad RoF on a LiPo since m'Tech did his servicing on it, but my TM AK47 (also serviced) is noticeably faster too.
Maybe Jake and I are both being afflicted by the same problem, though mine has take a bit longer to become noticeably poor.
If the whole thing was under-lubed to start with and has dried out after a few games that might be an issue...? Or is that a bit of a reach?
Or is it another sign of a weak spring? To be honest I'd have thought weak spring = higher RoF, not lower, but I'm willing to hear opinions.
Could the motor need raising / lowering?
A worst case scenario popped into my head - could my gears have lost some teeth?
I'm comparing it to my CA M16 which quite frankly sounds like it's got a mad RoF on a LiPo since m'Tech did his servicing on it, but my TM AK47 (also serviced) is noticeably faster too.
Maybe Jake and I are both being afflicted by the same problem, though mine has take a bit longer to become noticeably poor.
If the whole thing was under-lubed to start with and has dried out after a few games that might be an issue...? Or is that a bit of a reach?
Or is it another sign of a weak spring? To be honest I'd have thought weak spring = higher RoF, not lower, but I'm willing to hear opinions.
Could the motor need raising / lowering?
A worst case scenario popped into my head - could my gears have lost some teeth?
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Tactical Pith Helmet
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- Jul 5, 2016
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May not even be the rif. A shit balance charger can charge your batteries to all sort of random states of charge. Are you testing them on the same battery?
RostokMcSpoons
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Yes, all on the Titan 7.4v Li-Ion.
Ebeneezer Goode
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Yeah, if its labouring might be the battery. Also check motor connection.
If you'd lost teeth in the gearbox I'd imagine there would be other noises and weirdness so dont think that would be it...
If you'd lost teeth in the gearbox I'd imagine there would be other noises and weirdness so dont think that would be it...
RostokMcSpoons
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I haven't done any of my famously wonderful soldering on the M906, so I don't think the connection to the battery is a problem. The battery is working fine with the other guns. I could retry one of my other Li-Po's but they're at storage charge levels at the moment.
The gun does sound a noisier than the other guns - perhaps it needs some shimming. Opening up the gearbox is not something I really want to try because I'll probably end up with a bunch of parts and insufficient skills to put them back together properly (as happened with my AK)
I will make a slight adjustment to the motor height from the pistol grip baseplate, see if that changes anything, as that's a simple thing to try!
The gun does sound a noisier than the other guns - perhaps it needs some shimming. Opening up the gearbox is not something I really want to try because I'll probably end up with a bunch of parts and insufficient skills to put them back together properly (as happened with my AK)
I will make a slight adjustment to the motor height from the pistol grip baseplate, see if that changes anything, as that's a simple thing to try!
RostokMcSpoons
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Ok, as it's lunchtime I've picked up my guns and connected the batteries in, and I have to say the DE doesn't sound nearly as sluggish as before. Maybe it was just too damned cold from a day's skirmishing, and hadn't fully warmed up when I test dry-fired it in the house.
I've made videos of the DE running on both the fully-charged Titan 7.4v Li-Ion, and the probably-almost-empty Turnigy 11.1v Li-Po
See what you think...
https://www.youtube.com/watch?v=3-xsDy7hO-M
https://www.youtube.com/watch?v=vssqdmNKVIA
(Not much difference in the RoF between the two batteries to my ear, that 11.1v needs a full charge and I'll maybe re-upload it)
and for comparison my Classic Army M16 (which might have been upgraded a gazillion years ago)
https://www.youtube.com/watch?v=wpU5RuvkxeA
I've made videos of the DE running on both the fully-charged Titan 7.4v Li-Ion, and the probably-almost-empty Turnigy 11.1v Li-Po
See what you think...
https://www.youtube.com/watch?v=3-xsDy7hO-M
https://www.youtube.com/watch?v=vssqdmNKVIA
(Not much difference in the RoF between the two batteries to my ear, that 11.1v needs a full charge and I'll maybe re-upload it)
and for comparison my Classic Army M16 (which might have been upgraded a gazillion years ago)
https://www.youtube.com/watch?v=wpU5RuvkxeA
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- Thread starter
- #68
Yeah mine has both the screws you are talking about so will try that did see them but i hadnt a clue what they where so thought lets not mess with it 30 mins before the games started haha.
After some reflection i personally dont think my ROF is that bad as i am only using a 7.4v when the recomended is a 11.1 so that will be one reason. Also have been watching a few speedy boi videos and there HPA ROF is just a different level anyway so comparing it to them is going to make it look like a massive difference.
RostokMcSpoons
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Did you watch my videos? How's yours compare to mine?
HPA is ridonculousness, can't compare with that!
ak2m4
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- Feb 23, 2014
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@RostokMcSpoons just watched your video's, I would have expected a bigger jump from 7.4 to 11.1. Of course a lot of other factors at play. Ideally it's worth testing with another motor you have have the running in another RIF and compare the 2. Still the original motor? I imagine the stock motor is super bargain basement.
- Thread starter
- #71
not yet as im in work and cant access youtube but will have a look on my lunch and get back to you.
RostokMcSpoons
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Do please bear in mind that the 11.1v is right down near storage-level charge... ~10.5v total, ~3.50v per cell
I suspect that'll be the real reason...?
I'm bunging one on charge now, I'll re-test and re-upload at lunch.
- Thread starter
- #73
Yeah the charged one shoulkd 100% make a difference like never know motor might be topped out but more likely the charge of the battery. let me know when you have uploaded again im keen to see the difference.
RostokMcSpoons
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Oh bejeezus... I've been charging my Li-Po with the selector switch set to Li-Fe. Have I buggered it?
- Thread starter
- #75
if it hasnt blown up it should be fine i'd give it a proper balance charge just to be safe and then it should be back to normal
RostokMcSpoons
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Yeah it seems ok after a 'proper' charge. Phew!
There's now a noticeable difference between the 7.4v and 11.1v, as expected. I'm a bit too busy to do the video now.
There's now a noticeable difference between the 7.4v and 11.1v, as expected. I'm a bit too busy to do the video now.
- Thread starter
- #77
no rush let me know when you upload them and ill have a look
RostokMcSpoons
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Finally got around to re-doing the video for the fully charged 11.1v battery, and also I meddled with a video editor to see what it was like. 
edit: video replaced, see post below.
edit: video replaced, see post below.
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- Thread starter
- #79
RostokMcSpoons
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My Chinese cheap-as-chips chrono has arrived!
Interesting results so far, given that when I chrono'd my M906C at the site, in the bitter cold, it showed 230fps! My AK was at 270fps which is what I'd been told it ran at by the site tech after he'd meddled with it, so I have to trust that chrono.
Now nice and warm it's showing at 295-310fps depending on a bit of fiddling with the hop
It actually got the highest fps as set for 0.28's at the site, but as I've only got 20m range at home, I don't really know how it's hopping now.
The rate of fire showed at 12rps with the fully charged 7.4v Titan, and 15rps with the 11.1v Li-Po. However, that's not fully charged (again). I'll repeat the experiment once that's done.
The horribly low fps tells me the stock hop rubber or perhaps the lube (or lack of), or the seals ... maybe even the tolerances within the gun do not like cold temperatures. At all.
Now I've got the chrono and I'm on holiday til the New Year, I'm going to test the accuracy as it is now, videoing as I go. I'll then upgrade the gun with the M100 spring, Macaron 50deg rubber and Omega nub, and see where it's after that. I'll even try leaving it out in the cold for an hour or two to see if that changes things.
Interesting results so far, given that when I chrono'd my M906C at the site, in the bitter cold, it showed 230fps! My AK was at 270fps which is what I'd been told it ran at by the site tech after he'd meddled with it, so I have to trust that chrono.
Now nice and warm it's showing at 295-310fps depending on a bit of fiddling with the hop
It actually got the highest fps as set for 0.28's at the site, but as I've only got 20m range at home, I don't really know how it's hopping now.
The rate of fire showed at 12rps with the fully charged 7.4v Titan, and 15rps with the 11.1v Li-Po. However, that's not fully charged (again). I'll repeat the experiment once that's done.
The horribly low fps tells me the stock hop rubber or perhaps the lube (or lack of), or the seals ... maybe even the tolerances within the gun do not like cold temperatures. At all.
Now I've got the chrono and I'm on holiday til the New Year, I'm going to test the accuracy as it is now, videoing as I go. I'll then upgrade the gun with the M100 spring, Macaron 50deg rubber and Omega nub, and see where it's after that. I'll even try leaving it out in the cold for an hour or two to see if that changes things.
