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HelicopterMain Discussion › Tail swings out during tail-first loop?
01-28-2007 07:18 AM  10 years agoPost 1
irq

rrKey Veteran

San Diego, CA

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I've been trying some tail-first loops on my Evo 50 lately, and almost always the nose rotates clockwise about 90 degrees when i'm going into the "up" part of the loop. I'm running a GY-611, with the servo arm in the 3rd outer most hole of a 4-hole Futaba cross servo arm (sorry, wish I had mm measurement) and on the tail rotor, I have the ball in the middle hole. I originally had it on the outer hole and moved it in one, and that helped a bit, but not much.

I've tried various gain settings, from 20% to 70% (just for a minute) and that didn't make a difference either.

I'm running the stock Evo50 tail blades (MAH) but I did upgrade my tail rotor to the Freya tail rotor (new spindle, grips, bearings.

Any suggestions?

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01-28-2007 03:27 PM  10 years agoPost 2
Swoop

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Newark, DE USA

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Not trying to insult your intellegence, but have you had someone watch your thumbs while performing this maneuver to make sure your not giving tail inputs? Many times you give unwanted inputs without realizing it. You didn't mention your tailblade size. Go with 95's, you may need a longer tail fin to keep them out of the dirt though.

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01-28-2007 03:33 PM  10 years agoPost 3
3Dx

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Monterrey NL

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Are you using carbon vertical fin???

That may be the problem, if not using them.

Team JR/Spektrum, Team Vibe, Team CYE, Team Next D/Rave, Team Outrange Batteries, Team RedFox Fuel

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01-28-2007 03:47 PM  10 years agoPost 4
rookie5

rrVeteran

Harlow, Essex - United Kingdom

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put some carbon tail blades on the evo50 the tail will hold alot better.

the stock blue tail blades are crap for 3d

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01-28-2007 10:07 PM  10 years agoPost 5
Droid

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Deep down in the Southwest- UK

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Are you using carbon vertical fin???
And how exactly does that effect the tail holding capability in a backwards loop

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01-28-2007 10:13 PM  10 years agoPost 6
Yug

rrMaster

UK. Herts

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A solid fin offers more resistance, so as soon as you'r tail is not perfectly aligned with the direction you're travelling in, the wind catches it, overpoweres the tail blades and bingo. A pretty good test for gyro setup is doing big sideways loops.

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01-28-2007 11:06 PM  10 years agoPost 7
Leif

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USA

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OK. Sounds like you have most of the bases covered:

- Freya tail upgrade
- MAH carbon blades
- High-end gyro/servo

I wouldn't recommend going to 95mm blades with the Freya hub/grips as that's like putting 103mm tail blades on with stock grips. The MAH 90s are fine.

The vertical tail fin suggestion is a good one. If you don't have a carbon 3D fin, you can try cutting the openings out of the stock fin to reduce the amount of "sail" from the fin.

The other thing to check is your headspeed. I find that I often bog the head during backwards loops. This is simply due to dumb thumbs and putting in too much cyclic/collective at once. Losing headspeed can cause the tail to blow out.

The suggestion to have a buddy watch your fingers is also good advice. It's amazing what those fingers do all on their own sometimes.

Leif

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01-28-2007 11:29 PM  10 years agoPost 8
irq

rrKey Veteran

San Diego, CA

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I do have a 3-d fin and I did have someone watch my fingers... I think your suggestion of bogging the headspeed is what's causing it. Thinking back, the few times I was able to do it without the tail swinging out was when I tried doing them more slowly and less, um, "twitchy".

I'd love to go try this advice but unfortunately I've got some sort of stupid flu and I'm in bed. But hopefully next weekend I can Thanks guys!

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01-28-2007 11:37 PM  10 years agoPost 9
Yug

rrMaster

UK. Herts

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Sorry to hear of your flu. bummer. What you say makes sence in that if you are new to this manouver, then there is a greater tendency to 'snatch' at the sticks which will put undue loads on your heli. Perhaps you should practice doing them big and progressively making them smaller and smaller until you end up with a flip. This way, you'll get a better feeling for smooth inputs without overloading the system. There's plenty of time to get through backwards loops, same as forwards loops, so take your time.

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01-29-2007 12:24 AM  10 years agoPost 10
Leif

rrElite Veteran

USA

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I find backwards "loops" easier to do starting from a tailslide. Gives you all the speed in the world to start with. It does take practice to keep from overcompensating on the controls.

I'm using just a 401/9254 on the tail but it holds through the maneuver and also through sideways loops if I don't let my fingers twitch too much.

Leif

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01-29-2007 12:36 AM  10 years agoPost 11
irq

rrKey Veteran

San Diego, CA

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Hey, one thing I wanted to check, it's okay for the GY-611 servo to be mildly warm after a flight, right? Just not actually "hot" but barely perceptibly warm?

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01-29-2007 02:21 AM  10 years agoPost 12
Leif

rrElite Veteran

USA

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You mean the servo right? Heck yes, they get warm. The motor is pulling juice and moving all the time. That generates some heat.

If it feels HOT then you've got a problem, but all servos will get a bit warm when you run them.

Leif

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01-29-2007 02:33 AM  10 years agoPost 13
GatorUp

rrApprentice

Palm Beach,Fl.

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why don't you try tracking the tail. It sounds out

Living life on a razors edge,.. Go GATORS!!!

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HelicopterMain Discussion › Tail swings out during tail-first loop?
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