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HomeAircraftHelicopterHIROBOOther › looking for alum.evo tail pitch boss
02-11-2006 12:43 PM  12 years agoPost 1
GURUMODS

rrApprentice

Poughkeepsie,New York

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I am looking for an aluminum "tail pitch lever boss" for my evo 50.The part # for the plastic one is (Hirobo) 0414-141.
I can't seem to find an alum.one.Apparently there are not a lot of upgrades for the evo as i thought.This part keeps wearing out very fast on my heli.I have disconnected the linkage and checked for any binding,checked the bearings,checked the throw.Everything seems to work freely,but obviously something is wearing this out.
This part is a plate which slides over the tail shaft and is connected to tail slider mechanism.There is a groove in it where two pins are in it to control the slider.I have done a SEARCH quite a few times with no luck.
I sure would appreciate a link if you see one for this part.
Thanks

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02-11-2006 12:49 PM  12 years agoPost 2
z11355

rrMaster

New England

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I've never seen or heard of that done in metal.

acutally, I'd think an aluminum version would have worse
wear characteristics.

As you noted, something is wrong because I've never worn one
of those out on 3 different machines.

are you seeing any slop movement of the tailshaft (in/out)?
how about the pitch boss on the brass slider?

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02-11-2006 01:22 PM  12 years agoPost 3
GURUMODS

rrApprentice

Poughkeepsie,New York

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I have checked everything.I am about to replace anything that is near the plate.What is happening is the two pins are making a footprint into the groove .They still move the slider easily,but they stay in one place and prohibit the plate from spining if it wants to.
I guess it is time to order some parts and replace averything in that area.
A fellow pilot has an evo and he does not even clean it.He has beaten that poor thing and his boss plate is still like new

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02-11-2006 01:37 PM  12 years agoPost 4
Leif

rrElite Veteran

USA

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It is most likely that the cap screws/pins on the pitch lever are threaded at an angle, causing them to grab and wear on the boss. It is critical that these screws are straight, and if you try to use the screws to cut the threads in the arm it is very difficult to get them started straight.

I would recommend that you get another stock pitch lever and pitch boss. When you thread the holes in the pitch lever, do NOT use the short cap screws. Instead, use a long M3 bolt or a M3 tap and make sure that you thread it straight. If you don't have a M3 tap, you can make a good substitute by cutting some slots in a standard M3 bolt using a dremel and cut-off wheel.

An aluminum pitch boss would probably wear just as quick, and would also be a source of RF interference due to the metal-metal contact.

Leif

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02-11-2006 01:51 PM  12 years agoPost 5
mrNoodles

rrProfessor

Borlänge, Sweden

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Never had any problems with the plastic tail pitch plate boss.

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02-12-2006 07:33 AM  12 years agoPost 6
Ivan

rrVeteran

Wichita

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FYI, plastic (nylon and ABS, etc) have much better wear characteristics than aluminum, which has really terrible wear characteristics. If you have ever seen plastic and aluminum rub together on your heli, the plastic always wins, the aluminum gets the groove. This is why they make bushings out of plastic and brass, but not aluminum. The tail pitch boss would be an extremely bad place to use aluminum. Although delrin or glass nylon may be a good choice.

Back to it!

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02-12-2006 12:41 PM  12 years agoPost 7
GURUMODS

rrApprentice

Poughkeepsie,New York

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All posts read.Thanks for your input

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02-12-2006 01:59 PM  12 years agoPost 8
angelob

rrKey Veteran

Stoughton WI

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Here's a topic with some more info for you:

http://runryder.com/t211990p1

I've run into the same issue and when I showed it to a well-respected evo pilot, he told me that he sees it all the time and he has to replace that part every couple of months or so. Not sure why it wears on some and not others, but I do keep a couple of spares around.

Angelo

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02-12-2006 02:15 PM  12 years agoPost 9
GURUMODS

rrApprentice

Poughkeepsie,New York

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angelob,that is exactly what i'm talking about.Funny how some never even show any wear and others wear very quickly.I did grease mine also and rotate pins.I'm still gonna replace pins and boss again. THANKS

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