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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › (PM!) Preventative Maintenance
08-02-2007 06:01 PM  13 years ago
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floop

rrVeteran

Southern, NJ

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(PM!) Preventative Maintenance
How often do you replace parts that wear?

1. Plastic ball links
2. Tail Drive belts
3. Main Gear / Pinion
4. Bearings
5. Others

I have 60 flights on my T-rex 600 and I am a newbie. Just wondering in general if anyone has set procedures or tips.
IT's what I do.
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08-02-2007 06:05 PM  13 years ago
Cy Paul

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Hamilton, Ontario

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I usually go over the heli once i get home after a day of flying, and when i'm cleaning it, for the evening. I check over the links around the engine, frames, tail area, gears etc.. a total "once over"...

Thanks,
Cy
Helis currently flying =
Aurora,
Synergy N9,
Trex 600,
Trex 450
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08-02-2007 06:36 PM  13 years ago
TerranAce007

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Austin, TX

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You should always check the heli over thoroughly before every days flying. If you don't find problems, they tend to find you.

Wear on parts depends on several things. If you fly hard or crash often, you will probably need to replace things more often. When in doubt, a $5 replacement part is a lot cheaper than a crash...
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08-02-2007 06:49 PM  13 years ago
floop

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Southern, NJ

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Thanks all for post.

I am checking things before and after every flight and hoping to catch anything. So far I haven't found any parts going bad.

But I am wondering if anyone just replaces parts regardless of wear in a specific timeframe?
IT's what I do.
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08-02-2007 06:52 PM  13 years ago
RobRoy

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Huntsville, Alabama

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I do an extensive post flight which includes clean up, bolt check, and linkage check. Pre-flight is less intrusive, but do perform a quick linkage and control check along with a visual front to back, left to right.Ignorance is curable, stupidity is for life.
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08-02-2007 09:21 PM  13 years ago
colsy

rrElite Veteran

Cambridge, UK

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I've never owned a Heli that's 'managed' 60 flight's without either being destroyed or re-kitted.

Otherwise i would offer advice

Colin.
Only Quote From Experience.
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08-02-2007 09:34 PM  13 years ago
Leif

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USA

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->Plastic ball links - When they get too easy to pop off
->Tail Drive belts - When they have lost teeth or are broken
->Main Gear / Pinion - Only if damaged or stripped
->Bearings - When notchy or if too much play.

Bearings and links are the ones to watch, but unless you're crashing a lot or live where the environment makes things rust quickly these should hold up for several seasons. Check mainshaft bearings and blade grip bearings after any crash. Mainshaft bearings will feel notchy when they are damaged, while smaller bearings will just show more play than normal compared to a new bearing. Most of my ball links have lasted for many years, but they can need replacing if they've been stressed in a crash.

->Others: Batteries..... They must be managed properly.

Leif
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08-02-2007 10:19 PM  13 years ago
flyingquisinart

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Detroit Area

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After a crash, I will be replacing linkage ends on all linkages to the main grips, not just checking them. I put everything back together after a nasty one just to have a rod strip out of the link to the main grips. By some luck this happened just as I was spooling down from my test flight to get things dialed in & tracked. Ruined a brand new set of blades, tail boom, mainshaft, fins, and probably spindle ("looks" straight but probably isn't).

Putting all new ends before going up again. Two wrecks within 10 minutes of actual flight time because of it.
must have been a downdraft
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08-29-2007 09:17 PM  13 years ago
floop

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Southern, NJ

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Here is was my 85 flight maintenance:

Switched to metal grips.
Switched to 11T pinion. More is better?
replaced dampers using black ones
blade grip ball links
seesaw holder ball links

Everything else is still stock.

Anyone have other suggestions. I would like to make it to 100 flights without mechanical failure.

Thanks in advance for help
IT's what I do.
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08-29-2007 09:23 PM  13 years ago
RyanW

rrKey Veteran

Edmond, Oklahoma

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Depending upon the machine, I would say at 150~200 flights I would do a tear down. Remove the rotorhead and check mainshaft bearings, radial bearings in the blade grips, tail box bearings, etc. While you disassemble these areas you can check the that the bell cranks don't have slop and replace any hardware that seems worn. Installing new 'Jesus' bolts is a good idea along with new set screws if you happen to take apart anything that uses them.-Ryan
Mikado USA, Kontronik, Opti-Power, MKS Servos
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08-29-2007 09:31 PM  13 years ago
red_z06

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Dumont, NJ

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Floops:

Metal grips are not necessary unless you expect to exceed 2400 head speed.

Goiing with higher head speed will give you more pop on high energy maneuvers like tic-toc but will consume more juice.

Smooth 3D moves like piro-flips, funnels will work fine with 10T and give you more flight time.

We had original (updated) plastic grips that are 300+ flights with 3-5 crashes that are still good. We finally had to replace it to metal when we upgraded to 9s power setup.

Move the ball links in and out and see if it has developed a slop. If so replace them. However, if you are doing mild maneuvers, I doubt that they would require replacing.

If you have plastic pulleys for the belt, check for wear and replace as needed.
www.JustinJee.com
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08-29-2007 10:34 PM  13 years ago
gullie667

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Brooklyn, NY

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Metal grips are not necessary unless you expect to exceed 2400 head speed.
Gotta disagree on that one. I run metal grips on anything over 2000rpm on a 600mm blade. And when it comes to Align grips, I would be really tempted to run metal ones even If I where running less.

Saw a guy just the other day catch a grip just as it cracked but before failure. If he would have kept flying it probably would have failed but he "felt something funny"
Helicopters - 1000 parts flying in formation.
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08-29-2007 11:35 PM  13 years ago
Yug

rrMaster

UK. Herts

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Metal grips - do the maths - scary stuff

I tend to give my helis a good check over as I'm cleaning them and service anything that's required. The heli is then ready to fly so very minimal preflight apart from the usual stuff like checking links before each flight. Also saves time getting in the air. I usually give the heli a quick check over as I'm carrying it back to the pits after a flight. It's amazing how much one can check in that short walk - again, saves time

As for a major service, that happens after a crash, on average about every 130 flights which I reckon's about right

I like to always be aware of those inner voices. Occasionally, for no apparent reason, I find myself disasembling a bit of a heli only to find the reason for doing so.
Vegetable rights and Peace
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08-29-2007 11:39 PM  13 years ago
RadioFlyerMk

rrApprentice

Trenton, Ohio,

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With my electrics, I do an extensive check during an evening when I am not flying. That way I am not rushing myself to get in the air and when I do get to the field, I am ready to go. I check all servo mounting screws and output shaft screws. I then check all ball link connections. I check frame screws and pretty much every screw/bolt on the heli. I check the tail case closely including the belt. And I oil the main shaft and tail and clean as needed. The elctrics stay pretty clean except for the tail, so I clean that as needed also.
I also do a brief inspection in between flights, usually just a visual and I may tug on the mixing arms and things just to check them out.
I also periodically check mt Tx making sure nothing is out of whack there, such as switch nuts, settings, etc.

With my nitro machine, I check it closer in between each flight. Looking at all screws/bolts, I check ball link connections and the tail belt/case. When I return home, I clean the machine quite well and double check every moving part. Then I plug it in to the charger to get it ready for the next flying day, I leave it on trickle (Nicd).

As for ball links, if they are easy to remove, I replace them. I have also learned the hard way, not to over tighten things.

I am a firm believer in keeping a clean heli, and making sure everything is tight. I also visually check servo wires, especially if there are any near the engine, like with a gov. Just my ideas on what I do. It doesnt take that long and I prefer to do this stuff in between flying days, sort of like getting the grass mowed before the weekend. Take the time to do it, it may save you some headaches.
-----------------------
"I'd rather hover a Heli......than fly a plane"
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08-30-2007 02:08 AM  13 years ago
bigdad390

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East. Liverpool, Ohio

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I just check over and replace parts as needed. I have two Identical helis that I have been flying lately, both have approximatly 4 gallons throught them. Just this morning, I replaced the upper main shaft bearing, (felt notchy) on one of them.
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08-30-2007 02:13 AM  13 years ago
aviation

rrVeteran

Quebec Canada

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PM's
You can tell by how a machine is keep as to the finace of how one flys, even look at how neat or not how neat the wiring is done, one thing to watch is that there are no wires rubbing on the corners of the carbon fibre side frames, no wires dangling towards the main gears and no wires to tightley tie-rap together so the tie-rap cuts the wires due to vibration. I always put a piece of velcro around the wire before it is tie-rapped to anything.
After each flight the machine is cleaned and all oil wiped off as it is only a dust collector and a grinder to all the surfaces. Even cleaning of the main and tail blades is very important as they are factory balanced and with a lot of grass stains could unbalance them or a small clump of dirt.
Maintenance is a fine art and if you appreciate your machine, you will spend the time to keep it that way.

A Helicopter can be a dangerous weapon if not maintained correctly as a loose bolt on a blade could let go and who know's what can happen.

This is why I think that we all need to spend more time on PM's

aviation
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09-10-2007 07:21 PM  13 years ago
floop

rrVeteran

Southern, NJ

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104 flight PM
Well, I made it to 104 flights so far:

Did my 100th flight at the AC fun fly (Gathering) Thanks for letting a newbie register!!

11T pinion cut my flight time to 4:30 I think I am going to switch back to 10T

The metal grips show no flight difference as suggested by red_z06.

I am going to replace the rest of my ball links. And I am thinking of replacing the main gear when I check the bearings.

After seeing Alan Szabo fly I am considering the 600N. But I don't know if I could part with my electric 600. Plus nitro engines seem to fail a lot.

Thanks everyone for the PM advice. I am hoping my first crash will be pilot error and not mechanical...... knock knock..
IT's what I do.
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02-23-2008 01:22 PM  12 years ago
floop

rrVeteran

Southern, NJ

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Switched to Nitro 600N:

I have 75 flights on the nitro: So far I replaced the dampers, glow plug and rear bearing.

Any suggestions for maintenance on a Nitro bird?

How often to change parts?

Thanks
IT's what I do.
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02-23-2008 01:43 PM  12 years ago
kcordell

rrElite Veteran

O Fallon, MO

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I just wait until winter hits and then one of those cold snowy weekends, tear the model down and rebuild it. Good way to check all the bearings, wear points, radio gear and anything else going on. One thing for sure, I always replace the switch (and regulator if so equipped) along with the battery EVERY year. Pretty cheap insurance there.Team Synergy/Rail, Team Scorpion, YS Engines, VelTye
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02-23-2008 01:52 PM  12 years ago
AltecLansing

rrElite Veteran

North Carolina

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Every so often, I replace the ball links. I've crashed so much, the parts don't usually get to wear out. I try to keep the bearings well oiled and I check them after every crash. I have rebuilt the heli twice from the ground up in one year, but I did those during crash repairs so I could clean up everything and relube everything. I figure just before spring, I'll be breaking down my evo for another rebuild if I don't crash between now and then.Man, I miss the eighties.
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