It goes in hard!

[Stolla]

none of that crap since I changed to beast x, certain elevator movements on vbar causes hectic responses, been there done that! Especially in gusty conditions its a bitch.

[marcosp]

Yeap, though the 5.3 update is pretty solid. I agree with Danny that a mechanical failure is also possible.

[jamin_00]

Trouble is its hard to say.

I still have to download the log to see what that says.

[rctintin]

Put a BeastX on there Ben!!

[Vinger]

Never had it, but when I had a BeastX on my TRex500 it ballooned for any bit of disturbance, when my repaired VBar came back, fit it and it was and still is rock solid. I believe it is all in the setup and using the right blades for what you want to do. All my VBar equipped helis fly rock solid at speed, TDR with mini blue, Radix standard blades has done 239kmh in level flight with no bad tendencies.

Any heli will pitch violently at speed if you hamfist the controls, remember to use lots of expo and less cyclic if you want to do the speed runs and this is where the banks on the VBar come in real handy.

[Stolla]

can't speak for trex but I had just the opposite 3 tdr's on vbar switched to beast x, day and night difference, it doesn't care which blades, been using vbars since first versions came out, not anything anyone can tell me about setup with vbar. Haven't tried latest version though but merely the fact that they claim its better is acknowledgment it didn't work perfect before. But just my opinion...although I don't think there's many vbars at speed cup events in germany from what I heard. But I can say this running 100% thr on 1.6 mm. yy winding,4035 motor 560 kv 15t pinion 14 deg pitch pulling out of a high full speed knife edge dive 2 m above the ground is no problem for beast, something I would never even attempt with vbar. I haven't logged yet but did log the same flight pattern before on weaker motor governed at 65% 510 kv, at 242 kmh so imagine the difference in headspeed from a high dive. Setup on beast takes a little more knowledge of fless systems as they don't have the easy setup pages like vbar, although easy to setup a little more difficult to get perfect. And I'm not against vbar, still have them on all my 3 d machines some with vbar gov which is excellent again just my opinion!

[jamin_00]

Bits arrived this morning but I'm missing the TT drive shaft Email sent, hopefully receive it before the weekend???

[marcosp]

I've been waiting for parts from Jan to reconstruct my rotor head for 28 days and counting, not even arrived to my country........

[jamin_00]

Oh damn, I got an email about 1/2 hour after I placed the order to say they on the way and obviously being close to Germany they only take a couple of days.

I ship stuff worldwide from work and excluding customs can get goods anywhere within 48hrs so its possible

[marcosp]

Yeah, too bad Jan doesn't use EMS, only regular mail. In my case this means it is always stopped by customs and I must go pick it up, even for a $20 box, times are absolutely variable, the fastest was 8 days, very normal between 8 and 15 and this the longest at 28 without any news yet of arrival in the horizon.
The heli is still in flight though with a shake I am 99% sure is a bent main hub.

I read yesterday some people claim the SpinBlades Matt Black go out of track at high pitch. I am having visible shake on the canopy at high pitch........... Once I solve the regular shake I'll see if this other one persists and try other blades to rule that out.

[Stolla]

did you roll your spindle on glass surface to check (listen) for bend, logo shaft drop in btw, and doesn't bend in flight!

[marcosp]

Yeah, happens with brand new spindle too. I already ruled out everything, every bearing, blades, gears. It's a shake so not in the frequency of the tail. I don't want to hijack the thread, we discussed this, thing is it's been a month since my hub and blade holders shipped from Germany.......

[jamin_00]

guys, I don't think it was a retreating blade stall the more I analyse what happened. Surely a roll would have been the first evidence of this yet I had none. I know it happened very quick but it was defo only ele that gave up and I suspect this was due to the servo not having enough torque and the vbar not compensating for this with the front servos.

So I have gone with some BLS157's which have more than 3 x the torque so should be enough for it

Then I may even try the Beastx as I do see a few commenting about this over the vbar but I don't know on that yet.

[ZuvieleTeile]

Originally Posted by jamin_00

guys, I don't think it was a retreating blade stall the more I analyse what happened. Surely a roll would have been the first evidence of this yet I had none. . .
.

Imho a retreating blade stall will result in a pitch up because of the gyroscopic precession . . .

[marcosp]

Should be up and right on a normal clockwise rotor, don't know with FBL.

[Mercuriell]

Originally Posted by ZuvieleTeile

Imho a retreating blade stall will result in a pitch up because of the gyroscopic precession . . .

I'd agree - good point. Seems worth keeping HS up anyway.

[Vinger]

Originally Posted by jamin_00

guys, I don't think it was a retreating blade stall the more I analyse what happened. Surely a roll would have been the first evidence of this yet I had none. I know it happened very quick but it was defo only ele that gave up and I suspect this was due to the servo not having enough torque and the vbar not compensating for this with the front servos.

So I have gone with some BLS157's which have more than 3 x the torque so should be enough for it

Then I may even try the Beastx as I do see a few commenting about this over the vbar but I don't know on that yet.

Banshee did the world record with TDR head and 451 servos!

[marcosp]

And Jamin's Rotortech blades? Makes ALL the difference...

[Mixmaster Pilot]

Originally Posted by ZuvieleTeile

Imho a retreating blade stall will result in a pitch up because of the gyroscopic precession . . .

Yes it pitches up due to gyroscopic procession, but it also rolls right at the same time (in a clockwise rotating rotor) from the loss of lift from the retreating blade.

If it's just a pitch up it's not RBS.

[Vinger]

Originally Posted by Mixmaster Pilot

Yes it pitches up due to gyroscopic procession, but it also rolls right at the same time (in a clockwise rotating rotor) from the loss of lift from the retreating blade.

If it's just a pitch up it's not RBS.

Roll the FBL units can keep it in check, same with flybar, although at slower speed. If the retreating blade stalls it also precess through 90 degrees and cause a severe pitchup. Mikado changed the way the cyclic ring interferes in 5.3 to allow larger pitch changes to enable the head to be more stable at high speed!!

See

http://en.wikipedia.org/wiki/Retreating_blade_stall
http://www.copters.com/aero/retreating.html
http://www.helis.com/howflies/maxspeed.php
http://helicopterflight.net/rbs.htm