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01-23-2007 04:54 AM  10 years agoPost 1
Trackhappy

rrNovice

Glasshouse Mountains, Queensland, Australia

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OK, next problem...

Got the baby hovering, but the tail jus won't hold. Keeps letting go and you have to manage it. Setup is:
401/9254 combo. Hover head speed around 1550, but varied it up and down and it makes little difference. Tail servo ball is approx. 14mm out from center (Moved it in from where it matched the tail bell-crank link after somebody here told me what theirs was). Sensitivity is almost at max and at lesser settings it is worse (normal mode). Gyro resets ok as per instructions (all the guys run 401's at the field so plenty of experience to say that part is ok). Tail blades as shipped, standard black (95mm?) ones. Main blades Curtis Youngblood 710mm 3D blades. No governor yet. Seems to be a "normal" amount of delfection when the tail is moved by hand. Servo is about 6" in front of the engine on top of the receiver strong box. It was 2 inches further back than that and moving it made little difference. Added 3/8" foam but that made little difference.
I am thinking tail blades need to be 105's... any comments? Guys suggested I need 611 gyro for that sized craft but members here run 401 so it must be ok. Also suggested moving gyro behind main mast closer to center line. I know this one is always debated hotly. There is still more vibration than I would like from the engine, but we have not yet finished on that front. Can't hink what else to add.

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01-23-2007 01:12 PM  10 years agoPost 2
shuttlepilot

rrElite Veteran

Mullins, South Carolina

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I'm still thinking about what you have going on. I'm the guy who is running the linkage 14mm from the center of the servo. The machine might could do better with 105's, but the stock tail blades are doing fine for me. I have my 401 mounted about 1/2 the way back from the front of the rx tray and a little to the left side. I also have the 401 mounted on a piece of hard foam that came from one of my broken blade holders that are used in transport. I think the 401 is fine unless you are into fast backward flight, but mine holds pretty well doing that, of course I'm not a 3d pilot.." If I think of anything to check that you haven't, I'll chime in.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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01-23-2007 01:28 PM  10 years agoPost 3
Trackhappy

rrNovice

Glasshouse Mountains, Queensland, Australia

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One other thing I should mention is that the first time I tried to spool her up and play, the tail would stop deflecting when she was spooled up to hover speed. I fixed that by polishing the tail shaft and adding a little grease. Is it possible that is still too tight and causing some issue? I don't like using anything abrasive on the bronze bush, as the particles embed in the soft metal and it starts wearing the shaft, however I could make something to burnish the inside of the bush a little. Got a GV-1 on its way as another suggestion is torque swing if the motor is a little erratic.

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01-23-2007 02:10 PM  10 years agoPost 4
shuttlepilot

rrElite Veteran

Mullins, South Carolina

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I know that during breakin mine would be a little erratic because of the richness of the engine. If you can take your linkage rod and move the pitch of the tail blades easily, everything should be free enough. I also saw my tail pitch rod vibrate terribly until I lowered the rpm of my engine. After break in that went away, but I also added a 3rd guide to the pitch control rod. Swinging one way and not comming back almost seems like something is binding up.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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01-23-2007 02:13 PM  10 years agoPost 5
shuttlepilot

rrElite Veteran

Mullins, South Carolina

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Also, make sure that your pitch slider doesn't go far enough in (left rudder) that it hits the support for the pitch lever. Mine comes close, but doesn't hit. I think one other OD owner ran into this.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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01-23-2007 07:01 PM  10 years agoPost 6
mike5334

rrApprentice

traveling to North Carolina via MI and FL

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I'm the one that had the tail pitch slider hit the bellcrank mount ... multiple times. It does very bad things to your tail. Heh.

For me, the tail is slow to move. It's flyable, but I don't do pirrotte tall turns like I would with my 50 Pro. I've been seriously thinking of getting larger tail blades for a little more omph.

Mike M

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01-23-2007 08:10 PM  10 years agoPost 7
Trackhappy

rrNovice

Glasshouse Mountains, Queensland, Australia

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Mine does hit the bracket if you don't have the gyro limit set really short. Found that one out real quick. I noticed that one of the mini roll-pins in the tail pitch slider fork tends to work its way out after a short period as well. I think I will have to drill them and fit 2mm high tensile bolts and lock nuts instead.

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01-23-2007 09:29 PM  10 years agoPost 8
shuttlepilot

rrElite Veteran

Mullins, South Carolina

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Mine does hit the bracket if you don't have the gyro limit set really short.
I think my limit is still up above 100 on the gyro without hitting the bracket. I must still have something different than yours. I have also had the pin issue with my Q46. All I did was take a punch to the end of the roll pin and flare it out ever so slightly and never had that problem again. That is one of my preflight checks everytime.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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01-25-2007 12:18 AM  10 years agoPost 9
Droid

rrElite Veteran

Deep down in the Southwest- UK

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Add a couple of 1mm shims to the pivot bolt on the bell crank, this will allow thr fork to clear and gain some travel.

1550 rpm is a little low to get the best out of the tail try 1700-1750rpm.

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01-25-2007 01:17 AM  10 years agoPost 10
shuttlepilot

rrElite Veteran

Mullins, South Carolina

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Droid, I think he may have something else going on. When I'm running 1600, the tail on mine holds really well. I'm using a 401 and 9254.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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