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HelicopterFlybarless Rotor Head SystemsV-Bar › Tail not holding...
02-17-2011 01:59 AM  6 years agoPost 1
Justin Stuart (RIP)

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Plano, Texas

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I've got an old FBL Trex 450 running the 4.0 software. I recently bought some new 45C ThunderPower batteries for the helicopter and took it out to have a little fun. I only got a couple of flights in, but with these new batteries the tail wasn't holding well on full collective maneuvers. I don't remember if I have the optimizer set on the tail or not, but assuming I do, how many flights does it take for the 4.0 software to "learn" my new flying style?

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02-17-2011 04:26 AM  6 years agoPost 2
OICU812

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Edson, Alberta,​Canada

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So that tail was good "prior" to the new TP packs? If so then you need to adjust your tr gain and your tr precomp, and that should get you back to where you were prior. The new packs these days are a HUGE difference in the power and tourque they produce, so it is bound to make changes in headspeed and in tail holding control, adjust your paramaters and you'll be back to being happy.

...Once upon a time there were Nitros, flybars and frequency pins...

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02-17-2011 04:27 AM  6 years agoPost 3
Stolla

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Port elizabeth South​Africa

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It will not "learn" not to blow out you'll have to tweak and change parameters as you go along, saying that i could never get my furion tail to hold in v4 the way i wanted but after upgrading to v5 it was good so instead of wasting time chasing your tail get 5.1

Common sense may not be common after all

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02-17-2011 04:35 AM  6 years agoPost 4
Justin Stuart (RIP)

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Plano, Texas

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Yes, the tail was good prior to the TP packs. These packs make a HUGE difference.

To go from 4.0 to 5.1, I'm going to have to pull the head and do the swash leveler again, right? I hate having to do that.

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02-17-2011 08:29 AM  6 years agoPost 5
MrMel

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Gotland

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This wont fix itself, perhaps not even if you tweak the VBar at max.

As you introduce very high power there is a few things that will matter much;
Headspeed
Tail blade size
Good Tailservo

That said you should already make sure you run zero at sensor deadband and higher I-Gain and maximum throw.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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02-17-2011 11:22 AM  6 years agoPost 6
Justin Stuart (RIP)

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Plano, Texas

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What is the relationship between headspeed and the tail holding? I thought since the head and the tail blades were always spinning the same speed, increasing the headspeed would do nothing to help the tail hold.

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02-17-2011 11:24 AM  6 years agoPost 7
MrMel

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Gotland

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Higher headspeed gives more torque for the tail, it has a big impact.

(for sample, when you see those flying extreme low headspeeds, like Ulrich does on a L600SE, he's using up to 120mm tailblades to make the tail hold)

I'm pretty sure that the actual torque imposed on the tail from the main rotor also change with decreasing head speed, not sure exactly in what relationship though.

Base is though, higher headspeed = easier for the tail.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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02-18-2011 04:38 AM  6 years agoPost 8
Stolla

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Port elizabeth South​Africa

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Justin dont worry about pulling the head and using swash leveler, you
can use any thickish spacer, just make a cut so it can slide over the mainshaft between bottom bearing, (or collar) and swash, it does not have to touch the swash in centre position close is good as you can easily see if the gap is not perfect. V5 is really a huge improvement over 4 for small heli's espescially

Common sense may not be common after all

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02-18-2011 06:35 AM  6 years agoPost 9
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Thanks for the advice.

I can understand now how with low headspeed you need to pull more pitch to get the same amount of force from the main blades, and therefore you need more pitch on the tail blades (or longer tail blades) to compensate. That makes sense now.

I'm going to increase the headspeed a little bit first. That is easiest to do. Then I'll go to more extreme measures if that doesn't work. I will eventually upgrade to V-bar 5.1 since I know from experience this makes a big difference on the larger helicopters.

Going from 30C batteries to 45C batteries makes an incredible difference with this 450 helicopter.

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