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HomeAircraftHelicopterHIROBOHirobo Sceadu › Evo 50 woof and poof help!
10-11-2013 10:39 PM  4 years agoPost 1
Jennifer

rrNovice

Florida

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Hey guys,
I need some help.

I have an EVO 50 standard mix, that goes out of track in flight usually when I come back around zero pitch. I can bump the collective and get it to track again, but it's happening more often. I'm turning about 1800 RPM's.
The heli is stock except for the Metal yoke.

What causes this to happen?
I went thru the head complete, new trust bearings and all other bearings in great shape. Everything in the head appears to be fine.
Any thoughts as to what it could be. I'm lost.

Thanks,
Jennifer

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10-11-2013 11:12 PM  4 years agoPost 2
Ace Dude

rrProfessor

USA

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I had a Sceadu EVO 50 I flew for a number of years, but never had woof and poof with it.

Can you double check the swashplate bearing to make sure it's not loose can you cannot separate the top/bottom portions of the swashplate.

Also, can you check the mast collar to make sure it's tight and the mainshaft doesn't have any up/down free play in it.

  

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10-11-2013 11:33 PM  4 years agoPost 3
Jennifer

rrNovice

Florida

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Ace Dude,
Thanks for the reply, the collar is great, absolutely no slop. I fly inverted so do check that often.
I will check the swash, thanks for passing that on.

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10-11-2013 11:37 PM  4 years agoPost 4
Funky Trex

rrElite Veteran

Westerville, OH - USA

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Check all of your balls and links for something loose. I have had the woof and poof problem on a Raptor 50 but not with my Evo 50 when I had one.

What blades? My Raptor would do it with wood or fiberglass blades but never had the problem with Radix 600s after many, many flights.

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10-11-2013 11:53 PM  4 years agoPost 5
TMoore

rrMaster

Cookeville, TN

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Needs harder head rubbers. The head rubbers on the EVO are too soft. I used to make the rubbers out of Red Raptor rubbers and this correct that issue.

TM

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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10-12-2013 12:41 AM  4 years agoPost 6
dcasole

rrApprentice

Dacula GA

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+ 1 on the blades ... I converted mine to FBL and it flew fine ... for a while then it started

got the woof and poofs and chased every cause known to man

changed the blades to stiff carbon FBL blades and its gone

Dave

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10-12-2013 02:40 AM  4 years agoPost 7
Jennifer

rrNovice

Florida

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Hey Guys,
Thanks for everything, I went thru the head again and addressed all possible suspects and will give it a try tomorrow. I'll post if I have good results.
Thanks, Jennifer

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10-13-2013 09:15 PM  4 years agoPost 8
Dalieo

rrApprentice

SW FL

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Yes... try some different blades, had an old JR Venture that would do the same as you describe.

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10-14-2013 04:33 AM  4 years agoPost 9
DCORSAIR

rrVeteran

Selma, Calif.

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I've had 12 or so Evo 50's since the day they hit the market and they are picky on blade choice. I have only three Evo's now and I run Mah 600 blades on all mine, they just seem to work great on the Evo's for some reason.

D. Lee.....t.Born again.t.....

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10-14-2013 02:25 PM  4 years agoPost 10
KevinB

rrKey Veteran

Saskatoon, Saskatchewan, Canada

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I've used Radix (standard and FBL), Mavrick Pro(standard and FBL), and MAH blades on my evo50s and never had a problem. Never tried wood or FG blades on them though.

KevinB

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10-15-2013 12:31 AM  4 years agoPost 11
Leif

rrElite Veteran

USA

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A few things to check:

1. Check the seesaw to make sure it isn't cracked. (In the middle where it opens around the main hub). I had one that cracked in this area in a crash and I didn't notice it until later when I started to get this kind of out-of-track behavior.

2. Try new blade bolts. The hardened bolts from the SDX are best. The blade bolts can bend, which can induce an out-of-track situation that is lead/lag and headspeed dependent.

3. Check your collective servo for slop. The collective undergoes a lot of torque and if the gears start to wear then the slop in the servo results in the equivalent of linkage play that can also result in woofing symptoms. The cyclic servos can also contribute to this if they are developing slop.

4. As Terry mentioned, harder dampers can help. When I flew the Evo metal head I used one set of regular dampers in the inner position and one set of Infinivation dampers in the outer position. You can probably find Infinivation dampers for sale in the classifieds here. You can also tighten the dampers a bit by adding shims under them to get them to squeeze a bit. Shims can be made from soda cans quite easily.

5. A slightly bent spindle can also cause this symptom.

6. Bad thrust bearings in the main grips can also cause this, or grips where the thrust bearings were installed "backwards". It's important that the thrust bearings are installed the right way around.

Hope this helps.

Leif

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01-19-2014 01:29 AM  4 years agoPost 12
solo

rrApprentice

San Antonio Tx, USA

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I have a Rappy 50 and experience the "WOOF and POOF" due to servo spline screw came loose and back out some. Tighten it back up it was gone.

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