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10-25-2004 01:54 AM  13 years agoPost 1
fosterchild56

rrNovice

Local Hobby Shop

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I just put together a new/used Raven 50 c/ OS50 and flew it for the first time today.

Very impressed with the overall performance except for the tail.

It wagged non-stop. Futaba 401/9253 combo on the tail. Tried all sorts of gain settings. No luck

No slop or binding.

Just finished doing a search on tail wag and came up with the conclusion that my tail blades might be too long.

How do you measure them. Bolt hole to the tip or the whole thing.

They are carbon fibre with no mfg. decals. Bolt hole to edge/tip 100mm-105mm long.

Are these too long for the raven. I see most people run 92-95mm.

Any recommendations for c/f tail blades?

Thanks guys!

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10-25-2004 02:13 AM  13 years agoPost 2
SteveH

rrProfessor

Texas

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fosterchild56,

You are measuring them correctly.

Stock length is 85 mm, I believe, and I've been using 95's with good success. 105's are pretty long for the Raven, but you might be able to get by with them by moving the ball on the servo horn in one or two holes. That will effectively slow the servo output and reduce the change effectiveness of the tail rotor. I would give that a try, at least, before buying new blades.

The government cannot give you anything without first taking it from someone else.

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10-25-2004 02:26 AM  13 years agoPost 3
fosterchild56

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Local Hobby Shop

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Thanks for the advise SteveH.

Run'er with the new set up and I'll see what happens.

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10-25-2004 03:38 AM  13 years agoPost 4
AGRAV8

rrProfessor

Mosquito​Coast......Houston​Texas

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Check this.....

had the same kind of condition.....weird.....gain setting were not getting it done. Payton and I tracked it down to a LOOSE GRUB SCREW ON THE TAIL ROTOR INPUT SHAFT......was allowing it to "wind down" when a load was put on the tail. Give that a look too....

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10-25-2004 09:44 PM  13 years agoPost 5
beavis1

rrKey Veteran

New York state

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Check thrust bearing

Make sure the thrus bearings are in with the right ID races in and facing out. If they are backwards you will get the wags bad and will scratch your head forever.

Been there did that !! I put it together propperly and bingo was its nammme OOOO.

Take a look !!!

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10-26-2004 12:03 AM  13 years agoPost 6
fosterchild56

rrNovice

Local Hobby Shop

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I tried the stock blades with no luck.

I guess it's time to rip er apart. I'll check out the thrust bearings.

Thanks

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10-26-2004 12:58 AM  13 years agoPost 7
Syclic

rrApprentice

Northern Hemisphere​Ont.

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Beavis1

Good point re: the T/R thrust bearings. Found this to be the case with a number of different helis that use the great 3 bearing tail blade grips on their tail rotors.

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10-27-2004 02:39 AM  13 years agoPost 8
Sticky

rrApprentice

Frederick MD

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My Raven was wagging like a dog. It was second hand and the ball on the blade holder had been moved outward from its stock hole to one that provided more throw. Well there was way to much throw and I moved the ball to the stock hole and that cured it, and it still has plenty of power.

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10-28-2004 12:57 AM  13 years agoPost 9
RICH.L

rrKey Veteran

east springfield​p.a.

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did you ever move the ball on the tail servo horn,like steve h said?
i moved my servo on my hawk from up front to the tailboom,with it way up front i had the ball way out on the servo horn and worked o.k..
but when i moved it to the tailboom and took out all the slop,the tail wagged no matter where i had the gain set.
i moved the ball in to where the manual said and was able to increase my gain to 70% and no wag.
rich

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10-28-2004 01:08 AM  13 years agoPost 10
slammers

rrApprentice

Delta, BC

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As beavis1 said check the thrust bearings but also check that you installed the tiny spacer between the radial bearing and the thrust bearing race. If that is missing the tail will hunt all over the place. I think it may be missing from the manual but this little spacer is very important.

http://www.centuryheli.com/support/...ion01/30_31.pdf

In this picture there should be a small spacer/shim between the outer most radial bearing and the outer most thrust bearing race. If this is missing the thrust race will ride/bind against the outer race of the radial bearing.

It should be like the Predator instructions on page 15 step 73

http://centuryheli.com/support/manu...ator_manual.pdf

Shawn

Free Flight Log Software
www.lammers.ca/FlightLog

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10-28-2004 02:14 AM  13 years agoPost 11
fosterchild56

rrNovice

Local Hobby Shop

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To give you guys an update...

1) Found the micro washer to be in the wrong place pointed out by "slammers". It was right after the nylon lock nut instead of the first ball bearing. (Found an ammendmant to instructions on century's site for the raven).

2) Put on an old set of hawk sport blades. Same length as stock raven blades. Same part number anyway.

3) Not too sure how the thrust bearing was inserted. I all came apart on the bench when I popped them out. Cleaned them up and made visual confirmation that the larger on went in first on re-assmbly.

4) Ball link on t/r blade grip is in the hole as per ammendment diagram below.

5) For all you newbies out there. Just because you bought a new/used heli...don't take for granted that is has been assembled properly by the previous owner.

6) Best part of all this.... my OS50 is giving me grief on starting. Way too rich. Troubleshooting the motor so I can't tell if the wag is gone with new corrections.

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10-28-2004 11:37 PM  13 years agoPost 12
oldfart

rrProfessor

Vancouver, Canada

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Shawn,

Good call.

That is a common one I used to run into on a few occasions. The current Falcon and Raven manuals show it correctly but some from the first production runs did not.

Phil

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10-29-2004 06:01 PM  13 years agoPost 13
jldesign

rrApprentice

Erie, PA (EDINBORO)

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maybe your headspeed is too low? tail can't grab as it should? just a thought

jlDesign :: happy flyin'

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