Class S1...380 sized Speed!

[Tomy.]

Originally Posted by Konna

Undusting is started by cleaning my wiring and now i need to order batteries. 9S will be setup. And i will install LED lights on tailboom to help with turns. First testflight maybe in two weeks

If you don't mind me asking, what headspeed are you targeting with the 9S setup? When I was chatting with Kyle (Stacey) about the limits for the 380 as a speed machine he was comfortable with going in the 3800's range but not much beyond. I think I was running 3650 on it. 9S can probably do a whole lot more, but will the machine take it?

[KiloXray]

Tomy, I'm at around 3800 on the Protos 380. I'm on 8S and hoping to eventually push up to around 4200! Maybe this year!

I'll admit, though, I do worry about it simply letting go at some point. No idea what that point is.

[Tomy.]

Rob, you and I are chasing the same numbers ;-) I moved up to 8S plus a little "special sauce" just lately but other than very basic tuning I did not have a chance to fly it yet. On paper 4200-4300 is very doable with the Protos, but I'll want to see where the performance will start plateauing with the 2 bladed head. I have a number of different 380-390 size blades to try out. Still waiting for the NW winter to clear. They are forecasting snow for the weekend

(PS I honestly would not dare to come close to these HS numbers with the Goblin380 but I might just be wrong there)

[KiloXray]

Totally agree. Though, I have no intention of flying it again until things warm up a good bit. I'm not interested in flying it when my thumbs are even remotely cold, lol.

Also, to be honest, even at 120mph and these size helis get VERY small, VERY quickly. Pushing up well faster than that is going to be pushing my eyesight pretty quickly. Notable is that my vision is 20/15!!

[Konna]

Originally Posted by Tomy.

If you don't mind me asking, what headspeed are you targeting with the 9S setup? When I was chatting with Kyle (Stacey) about the limits for the 380 as a speed machine he was comfortable with going in the 3800's range but not much beyond. I think I was running 3650 on it. 9S can probably do a whole lot more, but will the machine take it?

Headspeed will governed around 4200-4300. Same as autum when it was raced last time. But with 6S HS dropped around 3600-3800 when loaded. Trying to keep 4000+ loaded with 9S. If it breaks then it breaks mid air, i'll sure get loud applause from audience on that point

I'll keep you posted when theres something new to tell.

[Tomy.]

Hah, I got new glasses in December still getting used to them. I'll either see the heli at 120mph or it'll be like ... what heli?

[Konna]

Originally Posted by Konna

Headspeed will governed around 4200-4300. Same as autum when it was raced last time. But with 6S HS dropped around 3600-3800 when loaded. Trying to keep 4000+ loaded with 9S. If it breaks then it breaks mid air, i'll sure get loud applause from audience on that point

I'll keep you posted when theres something new to tell.

And i'm aware that this is totally out of G380 design envelope and what is safe operation limits to this heli. Everyone who attemps this should be mentally prepaired to crash heli if things are getting wrong so nobody is hurt. Safety must come first!
I need to buy helmet...

[Tomy.]

Haha that's the healthy spirit there, entertainment for the people! Make sure you swap out the bolts often enough in the head. And probably new blades every once in a while would not hurt either. Just stay safe my friend!

[KiloXray]

What do you guys suppose that the weakest link in the head setup is? My gut tells me blade roots, but I have nothing to back that up.

[Konna]

Originally Posted by KiloXray

What do you guys suppose that the weakest link in the head setup is? My gut tells me blade roots, but I have nothing to back that up.

I dont know yet. Gaui X3 didnt fail on head and neither has G380 failed yet... Hard to say where it would explode... Heres my couple tests of Gaui X3 where head was fine but chassis didnt make it. Headspeeds were 3800-4200-4600.

X3 Speed Edition By Konna (1 min 43 sec)

Gaui X3 Speed edition By Konna Test 2 (2 min 38 sec)

[Konna]

Tested my Goblin 380 today with 9S setup. Keeps headspeed great but i gues it needs little weight on nose to get rid of head wobble.

Short video of todays flights.

Goblin 380 speedtest (2 min 20 sec)

[MikeW9788]

I don't know if you guys saw the YouTube video titled goblin 380 need for speed. He is running 4300 headspeed. Love what you guys are doing. Super cool.

[Konna]

Testing continues. Little weight on front helped alot but now i`m having aileron woble... But speed is going up
Now i have to open head to check the bearings to see if bearings on head are going bad.

If todays testing GPS logs are somewhat true i can say this little Goblin 380 is fast!
LOOK AT PICS!

And oneway bearing is finished, limit has been reached for it

[MikeW9788]

I would think the weakest point on the head would be the bolts on the feathering spindle. Mabey even the threads on the bolts.

[Konna]

Originally Posted by MikeW9788

I would think the weakest point on the head would be the bolts on the feathering spindle. Mabey even the threads on the bolts.

I dont't worry those bolts they will hold surely. I'm more concerned about the blade roots.

And yes pressure bearings are bad and inner ball bearing on the head. Ordering new ones and lets hope that woble goes away...

Chase for 200km/h is on!

[Konna]

More testing done. No fast results... Can`t get head shake away which eats speed away...

Is weight the problem now or something else?

Next week more testing with couple ideas...

[Justin Pucci]

Konna,

I haven't read all of the previous posts, so I may have missed some of your adventure, but...

Head shake can be caused by a couple things in speed:

1. Head gain is too high for the head speed you're running. The higher the head speed, the less gain you need.

2. Blade weight is too high or too low for the head speed and gain you're running. Yes, both can cause it and it's a pain to work through when you're trying new blades. If this isn't on a different set of blades for you, then just refer to #1 and find the tune that your blades "allow."

[Konna]

Originally Posted by Justin Pucci

Konna,

I haven't read all of the previous posts, so I may have missed some of your adventure, but...

Head shake can be caused by a couple things in speed:

1. Head gain is too high for the head speed you're running. The higher the head speed, the less gain you need.

2. Blade weight is too high or too low for the head speed and gain you're running. Yes, both can cause it and it's a pain to work through when you're trying new blades. If this isn't on a different set of blades for you, then just refer to #1 and find the tune that your blades "allow."

Setup is:
Goblin 380
Motor scorpion 3226 custom made power monster
Cyclic servos KST 315 HV Tail MKS 9767
ESC HW 100HV
Gryphon BEC
VBar NEO with VControl
Batteries 3000 mAh 6S and 3S
HALO 385 blades

I`m thinking that total weight is too much for microsize cyclic servos... But i have few ideas to test before changin battery size and/or cyclic servos to MKS. Mainrotor gain is allready lowered without results. Lowering governor gain did make some results so im going to lower it little more.

And why i think total weight is issue? Because it worked fine with 6S 3200 mAh battery but not with 9S batteries. With 6S there is not enough power to go 200km/h but with 9S headspeed doesn`t drop at all.

If anyone has a manual how to push these little helis to 200km/h average speeds just let me know peak speed is allready done... But who cares about peak speeds... Average speed is all i`m aiming for

Work on this goes on

[Konna]

Burnt my ESC today. BEC stayed on so i managed to save heli.

[Raptorapture]

Originally Posted by Konna

Burnt my ESC today. BEC stayed on so i managed to save heli.

Very fortunate. Separate BEC?