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HelicopterBeginners Corner › Need Help Again 2
12-27-2008 05:48 AM  8 years agoPost 1
nrad2000

rrVeteran

USA

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How do you ALL atach your main rotor head to the main shaft. Everytime I pull off and put back on the main rotor head it's not always straight. Should the cap screw and locknut be on tight? what do you guys do to make it go on straight? Or is that a Century thing.

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12-27-2008 06:51 AM  8 years agoPost 2
rakabun

rrNovice

Suzhou-China

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screw and locknut must be on tight.
Is your main rotor housing metal or plastic?if it is metal one,check it broken or not. I am chinese,english is poor

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12-27-2008 07:38 AM  8 years agoPost 3
nrad2000

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USA

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I have metal head on the Hawk Pro 50 and metal head on the Raven 50. I also have the plastic head on the Swift. All 3 do the same thing. If I place the head on the shaft and tighten the locknut - all 3 has a tendency to be miss aligned. When I slowly try to get it straight (by luck) I get it aligned. seems like when I suddenly torque the nut it slightly twists or moves the rotor head block in the same direction (if that makes any sense). Yes, their is a very slight (very tiny) play between the rotor head and the main shaft.

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12-27-2008 07:57 AM  8 years agoPost 4
rakabun

rrNovice

Suzhou-China

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In order to eliminate slight play between the rotor head and the main shaft.You can try to clamp metal main rotor housing a bit by the bench vise。just a little bit

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12-27-2008 08:24 AM  8 years agoPost 5
nrad2000

rrVeteran

USA

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Oh, I know where that extra play comes from now. I sand off the protective dark stuff that they coat the main shaft with (rust protector). It allows me to get a smoother swash movement and washout hub movement. Do any of you guys do this?

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12-27-2008 01:12 PM  8 years agoPost 6
JRjoe

rrElite Veteran

Jonesville , IN ​USA #1

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Does the instruction manual tell you to sand the main shaft????


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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12-27-2008 06:04 PM  8 years agoPost 7
Rafael23cc

rrKey Veteran

Junction City, KS

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Oh, I know where that extra play comes from now. I sand off the protective dark stuff that they coat the main shaft with (rust protector). It allows me to get a smoother swash movement and washout hub movement. Do any of you guys do this?
I think you are the creator of your own problems. Why would you remove the "rust protector" of a metal part? The parts of these helicopters are machined with pretty low tolerances to keep the play between the parts at a minimum. Some type of lubricant would have been a better choice for smoother movement. Triflow is the most popular lubricant.

The head block should fit on the main shaft with very little to no play. If you have play at the head hub, you also have play at the swashplate, at the main shaft bearings and at the main gear. All these parts are attached to the main shaft you sanded.

Hopefully nothing is damaged. If you torqued down the jesus bolt too tight, you could have deformed your metal head hub.

Rafael

Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com

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12-27-2008 06:57 PM  8 years agoPost 8
nrad2000

rrVeteran

USA

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Instruction manual does not tell me to sand the main shaft nor does it tell me to improvise when parts don't fit.

My first Heli was a Swift. It came with this dark material on the main shaft. the photo on the box was a shiny metal. I thought the shiny metal was an upgrade so i did not think of it as much. I assembled the rotor head, washout, and swash as described in the manual. It did not say anything about sanding the main shaft. I tried moving the swash on the main shaft and it was notchy on certain parts of the swash travel. so was the washout. the completed rotor head was also a very snug fit. I tried using different lubricants because the manual did say to lubricate the shaft area - still it was notchy. I don't remember which model but some of the older older helicopters came with a dark oxide covering on the main shaft that everyone removed. Thinking about that - I attached the main shaft to a power drill and spun it in a fine grit sandpaper removing the darkk layer. Presto!! very smooth movement. No play in the washout nor swash. only in the head. I now realize that I should not have removed the last tip of the shaft because the rotor head doesn't move. I'm sorry if this sanding upsets you guys but I did what I thought was the best.

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12-27-2008 07:24 PM  8 years agoPost 9
BeltFedBrowning

rrKey Veteran

Kansas City

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No one is upset. These are a great bunch of guys. Just order another mainshaft. Please do not put the head block in a vise or try to squeeze it. If you do you will need one of those too. I have lightly sanded the washout area of mainshafts with 1500 grit sandpaper to take out notchieness. A few passes with your finger will do the trick. Sand a little and trial fit, repeat as necessary. Remember to just have fun.

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12-27-2008 08:23 PM  8 years agoPost 10
nrad2000

rrVeteran

USA

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So technically I should be able to just slide the head assembly onto the main shaft and tighten tight - correct? It should be true and aligned, correct?

I'm wanting to order some new upgrades so I'll go ahead and order a couple new main shafts. I'll avoid the head part of the main shaft.

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12-27-2008 08:35 PM  8 years agoPost 11
BeltFedBrowning

rrKey Veteran

Kansas City

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Yep, slide the head on the main shaft and snug the bolt down. Not overly tight as you can distort the head block. There should be no play in the head when mounted on the mainshaft, even without a bolt through them.

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12-28-2008 12:54 AM  8 years agoPost 12
Rafael23cc

rrKey Veteran

Junction City, KS

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I'm sorry if this sanding upsets you guys but I did what I thought was the best.
Nobody is upset. It seems that you have some experience when you said this:
I don't remember which model but some of the older older helicopters came with a dark oxide covering on the main shaft that everyone removed.
So it is a good improvisation, but a little old school by today's standards. Just replace the main shaft.

Rafael

Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com

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HelicopterBeginners Corner › Need Help Again 2
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