Is It Worth Upgrading to 8s Power?

We took the ‪@fmsmodelRC‬ 8s 1500kv motor and 120 amp ESC combo and tossed them into the E-flite Viper 90mm RC plane. It's debatable as to whether this is truly an upgrade overall, as some aspects of the jet do suffer while others improve. You get more low-end thrust at the cost of higher end speed. This could also be a case of wind interference, but the model's tendency to stall easier is definitely a consequence of adding more weight to the wings. It can be a super upgrade for those of you who want the most power under any circumstance.
👀 Like what you see?
✈️ Pick up your own Viper 90mm: bit.ly/3JGRS30
🌬️ FMS 8s 1500kv motor: bit.ly/FMS1500kv
⚡ FMS 120 amp ESC: bit.ly/FMS120ampESC
🔋 SMC Batteries
We're flying on SMC Batteries from www.smc-racing.com and you should too. The LiHV packs are outstanding and you won't believe how well they perform until you try them for yourself.
🔥 5280 RC
Be sure to pick up a BlueFire or TrueFire 🔥 afterburner for this jet. Larry's afterburners look amazing - brighter than what you can get elsewhere, and cheaper too:
fiftytwoeightyrc.com/products...
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🎥: ‪@rcpilotwill‬
📦 Products We Recommend
Receivers:
Spektrum AR10360T Receiver: bit.ly/3SuAlPv
Spektrum AR8360T Receiver: bit.ly/3QBdgtc
Spektrum AR637T Receiver: bit.ly/3dCjiuO
Transmitters:
IX20SE: bit.ly/3BI3eBD
IX20: bit.ly/3BQvB0u
NX10: bit.ly/3Qm6BSR
NX8: bit.ly/3bA4dcA
NX6:
Servos:
AGFRC B13DLM: tinyurl.com/B13DLM
AGFRC B11DLS: tinyurl.com/B11DLS
Hitec HS-85MGs:
Batteries:
4s 30c 2200 Smart packs: bit.ly/3SsoUrB
4s 50c 2200 Smart packs: bit.ly/3dcdBU3
6s 50c 5000 Smart packs: bit.ly/3A0jVY2
6s 50c 4000 Smart packs: bit.ly/3JANxOL
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rc plane, aeroplane, rc planes, airplanes, airplane, aircraft, model airplane, flying model, tutorial, learn to fly, crash, rc plane crash, plane crash, tail heavy productions, brian phillips, rc saylors, the rc geek, flite test, flitetest, petrincic bros rc, eflite, horizon hobby products, horizon hobby, e-flite, viper, eflite viper, viper 90mm, 90mm edf, edf jet, sport jet, viperjet, fms motor, fms 1500kv, 1500kv
0:00 Introduction
1:25 Takeoff w/ 8s 3600 HV
3:30 High Alpha Performance
4:20 Landing & Battery Swap
5:40 Speed Testing w/ 8s 4400 HV
8:20 Touch & Goes
9:45 Landing & Battery Swap
10:47 Performance Flying w/ 8s 4400 HV
13:58 Landing & After-flight Thoughts
15:47 Tradeoffs on 8s Systems

[@thekingofdarts]

That is a lot of power with the SMC's! Great flights Also props to Will because it's difficult as hell to follow the planes going that fast and with your flying style. He makes it look easy.

[@manicfour]

Very well done video. ❤ it.

[@Icarusthe2nd]

Jon, welcome to the dark side of EDF setups 💪😁 Greetings from Belgium 🍻

[@scottyd035ntknow]

Welp, now I need to get one of these ARF+ next time they're back in stock. You are 100% spot on with your 8S assessment as well. Little more weight and some more cost but a LOT more punch or you can baby it for more flight time and the SMC LiHv packs are a game changer for this. Not sure I'd fly on the 3600s but the 4400s seem like the sweet spot. The 5300s are not too much heavier but there does need to be a cutoff.

[@TwoBrosRC]

4400s are definitely the sweet spot, but the 3600s also perform admirably if you don't abuse them! We'd recommend placing a backorder for the ARF so you can save your place in line - they'll sell out quick like anything related to this jet does: bit.ly/3ZF69UG

[@reconrc1787]

More power is always better! 💪

[@TwoBrosRC]

Not always. More power at the cost of more wing loading can make for a much poorer flying aircraft.

[@MrLew1965]

More Power and streamlining is what it's all about !!

[@air-headedaviator1805]

Is this the equivalent of an LS swap

[@TwoBrosRC]

Not sure what that refers to.

[@benosborne7890]

It for sure is 😂

[@benosborne7890]

​@@TwoBrosRC Car talk 😁. LS swapping is dumping a big old American V8 into cars that shouldn't have them 😁😁

[@manicfour]

​@@benosborne7890 😂

[@shanehoule9477]

Bad ass

[@WDRC]

Awesome demonstration of the 8s power. Man she is much more boosty.

[@ironmover5800]

Pretty cool for sure ,

[@airhammer6203]

Whiplash acceleration!! I don't recall, but was there any g force readings on the short throttle bursts?? That was cool, great flying and video, Jon. AirHammer out!!

[@TwoBrosRC]

We can either get GPS data or g-force data on the screen recorder, but not both unfortunately.

[@ArthurRC]

Hey braaaaah where’s ur speed gun ??? 😂😂😂 (you know what I mean huh?) 🤣 nice demo my man, 8S kicks ass for sure !!!!

[@aussiedigger1441]

Man that's powerful! Have you ever used a JP unit?

[@TwoBrosRC]

Nope.

[@TheWingedblade]

w8, is the music from the research screen in ace combat 7? liking it already hahaha ^^

[@TwoBrosRC]

The music on the ground is the hangar theme.

[@may4092]

Due to the increased weight, the viper will be at a higher angle of attack (AOA) at any given speed, which could result in approaching the critical AOA at a higher speed than it would have before. I have the FMS Viper with 6S configuration, and it is relatively weak. I am considering upgrading to an 8S setup.

[@ficosk8]

Nice Video, I would try two lightweight 5S packs for maximum speed if current isn´t too high

[@txkflier]

8/6=33% more voltage. You can use it for more power or more flight time. The cost will be well over 33% more.. 😊

[@sendit_rc]

I've been runnin 8s😎 it's a good setup. I'm doing a repaint on my viper 90. Bought a jetfan v3 90 with a het motor 700-68-1680 should be around 5kg. So happy you tried 8s!!

[@octane2099]

This is what I run on all my 90s its actually the 1680KV very hot motor about 4.6kg tons of power with a 1500kv I would run 10s

[@may4092]

hi, I fly on 8s with the FMS EDF unit. how will the jetfan v3 fit ? there are pre threaded holes on the engine mount

[@sendit_rc]

@@may4092 the jetfan v3 was a perfect drop in fit. You do have to epoxy the mounting tabs yourself and drill the screw holes to secure it but not that hard at all. I'm currently running the jetfan v3 and het 1680kv motor on 10s.the power is insane with good flight times of 4-4 1/2 minutes. I just picked up a Fms super scorpion 90mm and installing the Fms 1500kv. Gonna test 8s,9s and 10s to see what works the best!

[@may4092]

​@@sendit_rc Very nice, top speed? peak current draw? what ESC do you use? I guess you get these flight times with SMC batteries. I'm not from the USA, so it's kind of a problem for me, I get barely 3m (;.

[@sendit_rc]

@@may4092 top speed 160 mph in a dive.140 mph level flight. Esc I use is a castle creations HV 160 amp. Peak amp current 135 amps using 2x 5s in series RoaringTop 5800 mah 35c.

[@dbirds21]

Try the f16 tbirds 70mm on 8s. It's insane.

[@xXRapToRiXxGamer]

One more question, Do you mess with any esc settings on your setups? I am uncertain about what timings I should use with this FMS motor to get the optimal performance out of it... Do you just leave all settings stock as they come from FMS?

[@TwoBrosRC]

They're usually just left stock, not much reason to mess about with them.

[@octane2099]

Ones you go 8s hard to go back however ever would run 1680kv and some 5,000mah that's the best performance for any 90mm.

[@agapoabruzzi249]

Thats so crazy a completely different flying airplane, what gps are you using

[@TwoBrosRC]

bit.ly/3hDkcsY

[@mr.maneuver287]

did you have to program the esc at all ? or was it just drop in and play?

[@TwoBrosRC]

It was pretty much drop in.

[@mr.maneuver287]

@@TwoBrosRC so no programming at all ? besides calibrate?

[@Aero_Rc.]

How much time you get on the 3600 ?

[@TwoBrosRC]

Flight times are listed in the video.

[@M4rkmcc21]

Wow I'm so suprised them 2x 3600 4s lipos managed to CG the Viper with the heavier 1500kv. I had to fit 1 kg of lipo all the way upfront to balance the jet on how it was with the stock 6s set up/book CG. You must be maybe 3 to 4cm back from book CG? The 1500kv is great on 9s and the fms 1850kv is a peach on 7s. I think you're gona boost 8s sales now 👍🏾

[@TwoBrosRC]

It flies really well with the CG directly over the mains, whether on 6 or 8 cells.

[@M4rkmcc21]

​@@TwoBrosRC I'll give it a go thanks.

[@xXRapToRiXxGamer]

I have this very same EDF ESC combo for my F22 90mm that I am setting up currently. Just need to sand down the foam to make the bigger can fit. I am planning to fly with 850g total for both batteries...should be nice. Dude how do you connect the EC5 to the XT90 ESC? I don't see any adapter there.

[@rotormasher]

He probably plugs them in straight, I've done it many times but it's a bit lose fit

[@TwoBrosRC]

EC5 plugs directly into XT90. No adapter is needed.

[@xXRapToRiXxGamer]

Oh thx I can't believe I never just tried doing it LoL. Already ordered an adapter that I will end up using.

[@rotormasher]

@@TwoBrosRC I believe this isn't ideal, the plugs aren't the same exact size. I've done it myself but on this high power edfs this might be asking for trouble 😂

[@JustPlaneNutzRC]

@rotomasher Your absolutely correct. The XT90 connectors are 4.5mm vs 5.0mm for the EC5's. They do physically fit each other, but you get a very poor connection with high resistance. Try pushing just one side of an XT90 into one side an EC5, you will see how loose the fit is.

[@benosborne7890]

Holy mother of god that acceleration is insanity. It accelerates like a huge 3D prop plane

[@TwoBrosRC]

That acceleration comes at a cost of weight, though. On this jet it was definitely worth the tradeoff.

[@benosborne7890]

@@TwoBrosRC has always been my thought. You have thrust but you either have a heavy plane or 1.5 minutes of flight time. Ok for a giggle but wouldn't be my go to set up

[@shanehoule9477]

Bad ass

[@may4092]

By the way, the total weight of your batteries setup is 1184g. Does it works fine ?

[@TwoBrosRC]

Yep!

[@may4092]

@@TwoBrosRC my bad, it’s actually 816g total. Not too heavy..

[@brianhahne9623]

I wonder what the A-10 would do on the 8 cell.

[@TwoBrosRC]

It's already really heavy on stock, it would be hard to imagine going higher.

[@Streetreaper89]

great setup. i have a eflite 1.2m p51 that goes 126mph 6s 3300 and gets 7min flight times. although i fly Fpv. check out some videos.

[@ShaneSeiber89]

Is it a pain to install the motor?

[@TwoBrosRC]

Nope, drops right in.

[@tomling9310]

Much better with 6000 packs. Iv got mine running 9S 6000 packs with the fms 1500 edf unit. UNLIMITED vertical.

[@TwoBrosRC]

But way too much weight.

[@tomling9310]

@@TwoBrosRC na it’s not. 4:45 flight time. Much more stable and penetrates wind more like a jet and less like a foamy. But still lands nicely. There is too much emphasis on high Alfa etc with these models. It’s a sport jet, not a 3D model.

[@TwoBrosRC]

@@tomling9310 We prefer not to add extra weight. What works for you doesn't work for everyone else.

[@tomling9310]

@@TwoBrosRC absolutely I agree.

[@AN-ce1nd]

Stock setup is best. You want a faster model just get a turbine sport jet.

[@TwoBrosRC]

Best is a matter of opinion. We don't agree entirely.

[@ProjectMotoGraphics]

Should figure out a 24s system 😂

[@TwoBrosRC]

🔋

[@dbirds21]

There's not one jet that keeps me remotely interested on 6s. Except the su35.

[@steelrainfpv3383]

It's funny to me that when you reviewed the new Freewing Eurofighter I said that I bought it in the 8s version, yet your reply seemed to scoff and disregard 8s as if it was sacrilegious in that size edf model, I guess you're eating crow and your own foot at once?? Just messing with you brother, I knew that you'd come over to the dark side eventually, and 12s is only really intended for the bigger edf jets, the plus 100mm size.

[@TwoBrosRC]

Jokes aside, the FW Eurofighter is heavy enough on 6s. On 8 we can't imagine it flying any better, it'll just stall easier under the kind of maneuvers we like to perform. We tried out 8s to see how it would work on a jet that the 1500kv would drop into - and this was the best choice of the ones we had available. And surprisingly it did well enough that we'll probably keep this Viper at 8s for a while, though we can always change it back by just putting the heavier 6s motor into it that we used before.

[@steelrainfpv3383]

@Two Brothers Radio Control yeah it appears that the new Eurofighter has little room to adjust the cg backwards, especially for an 8s setup, and it looks like I'll be relegated to using two of the smaller and lighter 4s SMC LHV 3600mah batteries to keep the weight manageable. I do believe that I'll eventually have to swap it over to the 6s power train setup for my high alpha and acrobatic flying style, maybe in the future they'll release a thrust vectoring option to help this model with maneuverability.

[@lancelink88]

If you go 8S with standard motor and ESCyou will be inviting catestrophic failure.

[@TwoBrosRC]

Hence why we didn't use the standard motor or ESC.

[@franciscoduran3688]

Cra zy

[@wargor]

Slow down and take your time with the videos. Informative video but the rushing was so annoying.

[@TwoBrosRC]

It was 17 minutes, fellow. That isn't rushed at all. People want to see flying, not just talking.

[@michaellussoro2295]

Man up mines on 12s

[@TwoBrosRC]

Interesting, but probably at a high cost of low end flight envelope performance.