RunRyder - another blade tracking issue

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Blades, Night Flying and Painting > another blade tracking issue

deckerv
Veteran
Location: Wellsville, NY

I'm sorry, I know it has been covered.. but what do you do when you try to track your blades and no adjustments seem to make it considerbly better?? Do I just stick with one blade?? I just don't want to mess things up beyond comprehension for this newbie.. my brain gets fried easy enough

There is as much as 2" difference in the tips of the blades.. way too much for my taste

Oh.. it's a Kyosho Nexus, 550mm SAB carbons. Bought the blades used.. could this be the problem?? I recently rebuilt the head since a tip over on landing.. replaced the main shaft, feathering shaft, and the flybar. My paddles are KSJ and they're aligned right.. Would it be possible to have the swashplate alignment off?? How can I check that to be sure I have it right??

Sorry for all the questions..

Thanks

04-20-2002 Over year old.

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heliman41
Key Veteran
Location: Valparaiso IN. USA

You can try switching the mains in the bladeholders, also mark a bladeholder or add tape to a blade to be sure your adjusting only 1 blade. It should come into track, otherwise something has serious slop or you have accidently adjusted the wrong blade or the wrong direction. I have never seem a head that couldnt be tracked so your probably just adjusting the wrong rods or something, be SURE to only adjust the long rods from the swashplate and not the short ones otherwise the blades will have differential throw, a no-no.

04-20-2002 Over year old.

Monty_Burns
Heliman
Location: Sunny South West England (Yeah right!)

Take the blades off, switch your radio on and then move the blade holders by twisting them in opposite directions while holding the flybar straight and level - it might help to look at another Nexus without the problem first - then see if there is any considerable movement in the blade holders.

If there is then you will need to trace the slop in the linkages - see if the swashplate moves up and down on its verticle axis, if it does then the slop is between the swash and the servo, as opposed to the swash and the head - you'll get the idea. Some servos have a slight movement in them even when alledgedly holding a position - this is only about 1/2mm and is usually attributed to the servo head flexing in the frame. Make sure the servo is held down tight though.

Otherwise it mostly due to either bad blades (one flexes more than the other) - bad bearing fit in the blade holder or you are adjusting the wrong rod each time.

I assume you replaced the blades when you had unwanted contact with mother earth.

04-21-2002 Over year old.

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deckerv
Veteran
Location: Wellsville, NY

When it tipped over, i ended up putting some blades I bought used from someone.. They looked almost new.. but maybe that was why they were for sale?????

They're SAB 550's.. I had some go-quick 550's on it when it tipped over, and before that all my flights were on stock woodies (530mm) I'll check things over a bit more. It flew fine with the woodies, and tipped over with the quicks only because I put a new gyro in it and had the manual gain way too high, and it wagged on uneven ground as it touched down

.. Thanks for the info, and I'll check it out.

Thanks a ton!!

04-22-2002 Over year old.

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Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

If it's the Nexxes with the flapping rotorhead, it's very hard to track. First thing you need is head speed. Too much pitch at hover, or too little throttle, and you will chase that tracking around. The blades need to be tight enough also. Second, some experienced help. Third, some experienced help.

04-22-2002 Over year old.

deckerv
Veteran
Location: Wellsville, NY

It's the standard version.. The only changes I made to it after the tip over besides putting these SAB blades on it were the following:

Helimax hard main shaft (geeze that sounds bad

)
and a Helimax hard flapping shaft (sounds bad too

)
and a Concept 32vr swashplate (identical except it has metal balls rather than the plastic ones..)

I wish there were more heli pilots in the area here.. I'd have to go 2 hours to find one. Wellsville, NY is kinda in the sticks

Thanks!!
deck

04-22-2002 Over year old.

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Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

Deck, are they 530 or 550 SAB's. I have spare 550,s to try.

04-22-2002 Over year old.

Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

Ok . If it's the standard head then try this. Turn on the radio, turn on the receiver. Put the left stick up to your hover point ( 1/2 or 3/4) stick, however you set it up. Choose one blade and mark the top of the blade holder. I use a drop of whiteout. Put the pitch gauge on this blade, and adjust the pushrod until you get the recommended pitch setting(maybe5º). Now don't touch the radio during this. Now put the pitch gauge on the other blade and turn the pushrod until it matches. Then fly the thing. Only adjust the blade that is not marked. You should be closer this time. Let us know...Al

04-22-2002 Over year old.

Isaac F
Key Veteran
Location: Panama Republic of Panama

How the hell you are runing 550 blades on the Nexus!
Are they are not touching the tail blades????
I am pretty sure the maximun blade size for this heli are 530.

Also I know that the Nexus Main mast collar have four screw and if you tight one more than another can cause this problem.

What we do is put a Dial indicator on the tip of the main mast and tighted the collar. Yes I know is a PAIN IN THE ASS!

http://community.webshots.com/stora...57Opcytc_ph.jpg

04-22-2002 Over year old.

deckerv
Veteran
Location: Wellsville, NY

Thanks all of you!! I'll check that collar on the main mast as well. The 550's don't come near the tail rotor. Another RunRyder member, nexusnz was running them as well. Pleanty of clearance, especially since it is not the flapping head design.

Thanks for the offer rchelial.... I know the phase I'm in right now with the choppers, and it'd be against my better judgement to borrow someone else's blades to check

... Thanks a ton for the offer though.. If I can't get these tracked well... I have some new go-quick's and some NHP Razors I can try as well.. I was just saving the NHP's for the raptors... or I can simply stick to the stock woodies for the nexus and leave the better ones for the Rappy's... Thanks!

I'll try the pitch gauge tonight.

Thanks again everyone for the help!!

04-22-2002 Over year old.

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nexusnz
Senior Heliman
Location: Auckland/Taranaki, New Zealand

deckerv

You are having exactly the same problem I had with my Nexus but my blades went out of track when I went into idle 1.
I had 2 experienced Kyosho flyers look at my machine both of them NZ F3C champions one time or another and they didn't know why it was happening. This happened after I had a crash, they suggested to replace the plastic blade grips because the bearings in them had a bit of play, (bearings were new, put new ones in yours and see what happens)but they couldn't work out why.
I didn't replace my blade grips but sold my machine and have purchased a Caliber 30 (quick fix!) but I needed a new machine and didn't want to spend heaps of money trying to fix the problem.

Iain
www.nzhelis.xrs.net

04-23-2002 Over year old.

deckerv
Veteran
Location: Wellsville, NY

Mine seem in track when I'm close to 0 pitch, and as I increase pitch one blade flys out of track.. by about 3 inches!!!! So you think it may be the blade grips??

04-23-2002 Over year old.

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Alan Szabo Sr
Key Veteran
Location: Las Vegas, Nevada

Vo Decker , Sounds like you bought nexusnz nexus that he sold. I know everyone has a different opinion, but look down the blade from the tip on each one and see if one appears to have any mor wahsout or warpage.

04-23-2002 Over year old.

deckerv
Veteran
Location: Wellsville, NY

lol.. definately not his nexusnz's nexus.. It worked fine till I needed to disassemble it and replace parts due to a tip over. I think I'm going to toss in the stock blades and try those. I know they flew nicely.. and so did my go-quick 550's........ I gotta re-check the flapping shaft (god that sounds bad) and make sure it's 100% centered.. I know nothing is bent though.. replaced almost everything in the rotor system.

The blades look true to the eye anyway

Thanks!!
deck

04-23-2002 Over year old.

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deckerv
Veteran
Location: Wellsville, NY

Just wanted to thank all of you who replied.. The blades were the problem.. I put the stock woodies back on and they track perfectly.. I'm going to try some NHP Razor blades for it soon (530mm)

Thanks again!!
deck

04-28-2002 Over year old.

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clive45
Veteran
Location: NSW Australia

Blades out of track

I had the same problem on a second hand TSK 30.
Set up heli on the bench and check the blade pitch on both blades at say half stick. Guess what! Mine was 3.5Degrees different. This was traced to a blade arm being bent. This was put straight and checked pitch, both blades now very close. Checked tracking on the pad and only a turn on one to get perfect tracking.
Worth checking. Hope this helps

Fly safe and enjoy.
Clive

05-09-2002 Over year old.

deckerv
Veteran
Location: Wellsville, NY

Thanks again for all the replies.. I ended up getting some 530mm NHP Razor's for it, but for now just flying with the stock woodies.. The tracking is perfect with the woodies.. so I'm guessing the problem were the other blades.

Thanks again!!
deck

05-09-2002 Over year old.

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Raj Patel
Senior Heliman
Location: Humble, TX

blade tracking

I have a nexus 46, flapping head, and use NHP Razor 550's, with cut down tail blades for clearance. They are fantastic! I tried to use some TG 550's semisymmetrical blades which weighed 139 grams, well, the head would not track no matter which rod you adjusted.

The problem here is that the Nexus does not use any thrust bearings and can't track heavier blades.

Blades around 100 grams track perfectly!

Raj

05-11-2002 Over year old.

deckerv
Veteran
Location: Wellsville, NY

Thanks for the info Raj!!! I never knew that!! That would explain why the NHP's track well... they're very light.

06-10-2002 Over year old.

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Blades, Night Flying and Painting > another blade tracking issue

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