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HelicopterHIROBOHirobo Sceadu › EVO 50 SWM wearing quickly
09-06-2009 06:02 PM  8 years agoPost 1
Hoosier_Flyer

rrApprentice

Terre Haute, Indiana

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I have an EVO 50 SWM that is new this flying season. This heli has roughly four gallons through it and I noticed last night that it is developing quite a bit of play in the washout base and arms and between the anti-rotation pin and the guide.

What is the lifespan of these parts? I'm shocked that this is already happening. My R50 Titan has countless flights and is still as tight as can be.

Thanks in advance for any input.

Brian

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09-06-2009 06:18 PM  8 years agoPost 2
John Benario

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Las Vegas

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Play between the antirotation pin and bracket is kind of a fact of life, it happens, but not usually so badly that it gets your attention. The same parts on my Turbulence have gone through more than 20 gallons of brutal 3D with no excessive wear.

The Hirobo washout unit is a very good unit and is not known for wearing out. It sounds as if you have some vibration being generated that is going down from the head to the swashplate since you have now have two wear issues between the head and swashplate.

The obvious questions:

Have you balanced the flybar?
Have you balanced the blades on the head?
Are the blade bolts reasonably close in tightness?
Was the washout pin block overtightened and distorted so it binds the washout?

John Benario

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09-06-2009 06:32 PM  8 years agoPost 3
Hoosier_Flyer

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Terre Haute, Indiana

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All good questions John.
Have you balanced the flybar?
I haven't balanced the flybar as an assembly but the paddles are equidistant.
Have you balanced the blades on the head?
Not on the head. What is the best way to do this and the flybar assembly?
Are the blade bolts reasonably close in tightness?
As close as I can get them by feel. I typically run them pretty tight.
Was the washout pin block overtightened and distorted so it binds the washout?
I upgraded to the EX pin block during the build as the members on here seemed to think that the stock plastic unit had an issue with cracking.

The only vibration problem I've had is with the tail and I changed the tail blades and shaft and it is now very smooth. I haven't noticed any marked vibration in flight. The fuel stands pretty still. I run a YS 50 and it does seem that if the mixture isn't spot on, there is a vibration. Would that be significant enough to cause the wear.

Thanks,

Brian

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09-06-2009 06:45 PM  8 years agoPost 4
Dr.Ben

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Richmond, VA, USA

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If I understand you to mean you're seeing wear between the pins and the slots in the washout base, you can exponentially DEcrease the speed with which wear occurs by keeping the pin and groove interface lubricated with grease. Clean the two parts often and reapply fresh lubricant.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
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09-06-2009 06:52 PM  8 years agoPost 5
John Benario

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Las Vegas

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There is nothing wrong with the plastic pin block. The issue is people overtighten the 2 mm bolts and crack it. Don't overtighten and it will last forever.

Lubing the pins will decrease the wear, but you still have the vibrational energy there wearing things out until everything is balanced.

John Benario

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09-06-2009 07:00 PM  8 years agoPost 6
Hoosier_Flyer

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Terre Haute, Indiana

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The wear I'm seeing with the base is between the bushing and the main shaft. The fit of the pins in the base is great.

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09-06-2009 07:04 PM  8 years agoPost 7
Hoosier_Flyer

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Terre Haute, Indiana

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I'm using Tri-Flow oil to keep everthing smooth. Is this oil sufficient?

I don't typically have to clean and change very often as the places I fly aren't dusty with the exception being IRCHA which was practically a dustbowl where we were flying. I had a major cleanup when I returned home from there.

Brian

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09-06-2009 07:15 PM  8 years agoPost 8
Dr.Ben

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Richmond, VA, USA

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Correct. Lubrication is not a band aid for a bigger issue, but even on a dead smooth model, unlubricated metal on metal wears quicker than it does if lubricated.

I just saw the clarification of your post. The stock 412-110 mainshft is plain steel (hardened to a degree, of course). Thus over time may wear a bit relative to the fit of the washout base if you don't oil it routinely. The reason I believe this may be your wear source is that I've run the EX on the SS Freya shaft for over two seasons with no apparent wear between the base and the mainshaft. Is there any black wear indication on your mainshaft where the washout base is riding? I've seen this a few times over this past season on models with pretty dry mainshafts, IE no routine lubrication of parts.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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09-06-2009 07:22 PM  8 years agoPost 9
Hoosier_Flyer

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Terre Haute, Indiana

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I'm using the stock plastic washout base with the EX pin block. I have noticed the black on the main shaft where the base slides. I generally wipe it off and re-oil. Like I mentioned, I use Tri-Flow to lubricate that spot, among others. If I should be using a grease, any suggestions?

Thanks,

Brian

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09-06-2009 08:25 PM  8 years agoPost 10
AAKEE

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Boden, Sweden

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After about 300 flights my Evo50(HPM) became the nr2 heli, I got a SDX.

This is changed due to wear:

- Clutch shoe with shaft, two times, about 120 flights each.
- Main gear, one time...about 140 flights, then I got the DTDS type.
- Counter gear, after about 200 flights, now use DTDS type.

Have been changing some worn rod ends too.

Upgraded the sliding block of the washout to the 'alu' type for safety reasons.

It doesnt feel worn out, it feels and handles like new :-)

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09-06-2009 09:39 PM  8 years agoPost 11
Dr.Ben

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Richmond, VA, USA

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OK. Gotcha. I apologize for misreading your original explanation.

Continue to use the triflow; don't grease the mainshaft. Please understand that I am not implying that the stock washout base is of poor quality or design. It's just that you can't typically include an ultrapremium, honed bushing washout base in kits of this price range. Most companies don't bush the assembly at all.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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09-06-2009 11:26 PM  8 years agoPost 12
payne1967

rrElite Veteran

uk

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after 4 gallons you shouldn't suffer wear
my non evo sceadu hpm is 8 years old with the original std washout block and has a little wear but the model has had hundreds of hours flying on it
i also run the std mainshaft (not so old due to making love to mother earth the odd time or two)

and it doesn't take a number 2 slot with my sdx50 they get flown the same amount

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09-06-2009 11:52 PM  8 years agoPost 13
Dr.Ben

rrMaster

Richmond, VA, USA

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And it's for the reason of his apparent unusual and premature wear that John said what he did early on.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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09-07-2009 12:01 AM  8 years agoPost 14
payne1967

rrElite Veteran

uk

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Ben
I can confirm that the std shafts are perfectly ok to use
if the std hirobo shaft is out of stock whenever i bend one i use a quick uk shaft

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09-07-2009 12:50 AM  8 years agoPost 15
Dr.Ben

rrMaster

Richmond, VA, USA

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I went back and revised my original post. As is often the case, when anything but the stock part is mentioned in a discussion(in this case the SS upgrade shaft), people will instantly jump to the conclusion that there is something wrong with the stock part. THERE IS NOTHING WRONG WITH THE STOCK EVO/SDX MAINSHAFT.

I repeat: THERE IS NOTHING WRONG WITH THE STOCK EVO/SDX MAINSHAFT.

The ONLY reason had had mentioned the SS shaft in the post since revised is that its mirrow like surface (what you'd expect in a $40 shaft)doesn't tend to create the slight black residue and very slight wear in the interface between the washout base and the shaft. That's ALL. Nothing else. Period.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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09-07-2009 04:35 PM  8 years agoPost 16
AAKEE

rrApprentice

Boden, Sweden

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Stock main shaft, 300 flights, still in use. The surface where the swash is sliding isnt that polished any more, a bit matt in the tone, but other than that perfect.

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09-07-2009 06:02 PM  8 years agoPost 17
Against Gravity

rrVeteran

Pottstown PA

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Mains and tails

I try to polish both the main and tail shaft before assembly. Makes your sliders move very smooth and I should help with bushing wear.
I also use tri flo and have good luck.

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09-08-2009 05:33 AM  8 years agoPost 18
Lewd Skywalker

rrApprentice

Manila, Philippines

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I think that wear is normal. I got about 4 gallons on my SDX too and I do notice that black dirt on the main shaft after flight during cleaning (same with the tailshaft). I just clean them and relube with Trinity bushing lube (used for r/c car bushed motors). No play though and the washout base hugs the main shaft tight and smooth enough.

Again if you notice play, they're right you may have some fine vibration issues wearing that washout base fast.

SDX FBL | Eagle3 SWM | Trex 600EFL Pro

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