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Ace Hobby . Esprit Model . Thunder Power RC

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Main Discussion > cant see the point balancing blades or
 
 
datidun
Senior Heliman
Location: n ireland

My Posts This: Topic  Forum		always used to balance the blades on every heli ,but after doing research there is no point balancing the blades without the head .i balanced the blades as usual but when i put the whole head including the blades on the balancer it was way out ,now i have balanced the blades with the head on, with tracking tape seems to work ,what do you guys think
07-03-2009 02:56 PM
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TOSH
Elite Veteran
Location: UK.Peterborough

My Posts This: Topic  Forum		l think the head must be way out of balance. What heli is it?

Flybars. Who needs `em.
07-03-2009 03:03 PM
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excellone
Senior Heliman
Location: Arlington, Virginia

My Posts This: Topic  Forum		The head is not as critical but should be balanced separately. The "way out" you may be experiencing is at the blade grip bolt. A slight off axis will move center of gravity of a blade/blades from balance.
07-03-2009 03:24 PM
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datidun
Senior Heliman
Location: n ireland

My Posts This: Topic  Forum		so your saying balance the blades seperately from the head ,if the head out of balance what could you possible add to the head
07-03-2009 04:32 PM
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ruddernate
Key Veteran
Location: sulphur,Ok.

My Posts This: Topic  Forum		http://runryder.com/helicopter/t518...=balancing+head

just a few more opinions.

fly it like you stole it
07-03-2009 04:45 PM
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GMPheli
Key Veteran
Location: W. Bridgewater, MA USA

My Posts This: Topic  Forum		IMHO the only way you can really balance a head with the blades mounted is to spin the head and blades first, to "seat" them to actual flying position. You then have to be very careful not to bump them at all prior to balancing. Just like excellone said. I have found this to be totally unnecessary. Balance the head sans blades, and then balance each set of blades individually. Once this is done, you can use the same blades on many different machines. I have more helis than sets of blades.
07-03-2009 05:03 PM
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life2short1971
New Heliman
Location: Fort White,Florida

My Posts This: Topic  Forum		To Balance my head/blades or just head I remove the main gear from heli so the head spins freely.(With good bearings of couse) I then lay my heli on its side at the edge of the tableand give the head a spin. If it rocks backward at the end i know it is off. Then I give it a spin the other way.If it doesn,t rock backwards or stop in the same place it did the first time I consider it balanced.Cheaper than those high dollar balancers too. Thats just me though. try it if you want.It works best if bearings have a little time on them so they are nice and free.
07-03-2009 07:36 PM
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predatorman
Senior Heliman
Location: Falkland Islands

My Posts This: Topic  Forum		I would balance both, but not together. I dont see the point.

To balance the head, to answer a question: depending on which axis...you can add a little bit of thin wire to the flybar...just before the paddle...add a little superglue to bond the wire once you are happy with the balance.

Other axis? you can gently file the end of the relevant (heavy side) blade bolts end...and mark the bolt and grip accordingly so you dont get mixed up.

Quality takes........time!
07-03-2009 11:56 PM
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HydroJoe
Senior Heliman
Location: SF,CA

My Posts This: Topic  Forum		The reason to check your blades is to just make sure they are matched. To say it does not matter makes no sense to me. Sure, mabey the head is out of balance too... but by balancing the blades, you can rule them out if there are issues. I guess i'm just lucky...I have never balanced my head, clutch or tail (never needed to.) If you trying to track down a vibration, it's a good idea. Otherwise, just fly it!

T-Rex 450 SE V2 , T-Rex 600 NSP, Stryker F27 C....Yea, it's a plank.
07-04-2009 12:30 AM
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Raptor Pilot
Senior Heliman
Location: Northern Ireland

My Posts This: Topic  Forum
Quote 
I have never balanced my head, clutch or tail
Funny enough, neither have i. I do balance the blades or as is the case now a days, check them for balance as they are usually spot on. 99% of the time the heli is smooth enough that the fuel in the header tank doesnt even have the slightest bit of foam in it. Quiet often all that is required is a bit of insulateing tape on one blade or as the one time ever i had to do was to put a bit of tape on a paddle. Everyone has their own ways of doing things, as long as the end result is the same ie, a smooth heli,does it really matter?

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!
07-04-2009 01:09 AM
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excellone
Senior Heliman
Location: Arlington, Virginia

My Posts This: Topic  Forum		"so your saying balance the blades seperately from the head ,if the head out of balance what could you possible add to the head"


Yes. Each blade should balance: weight, span cg and chord cg. Head balance could involve adding washers to the blade grip bolts.
07-04-2009 01:48 AM
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Gyronut
Elite Veteran
Location: Martinsville In.

My Posts This: Topic  Forum		You should always check the balance of the blades.

Just because they say Radix, for example, doesnt mean they're in balance.

Rick
07-04-2009 02:01 AM
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outhouse
Veteran
Location: auburn ca

My Posts This: Topic  Forum		Its plain silly to balance the head and blades together.

The head is built with tight enough tolerances that it should never be off balance ever.

Blades absolutly need to be checked well thast it [on electric]
07-04-2009 06:49 AM
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zaw
Key Veteran
Location: Lebanon, NH - USA

My Posts This: Topic  Forum		plus they're close to center of rotation it won't effect too much. if you put piece of tape near the center of the a blade won't vibrate much but if you move the tape to end of the blade.....

ಠ_ಠ HBK2 built with inexpensive parts! ٩๏̯͡๏)۶ Gaui425
07-04-2009 07:29 AM
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predatorman
Senior Heliman
Location: Falkland Islands

My Posts This: Topic  Forum		Well, for the little time that it takes its worth balancing blades.

Tail rotors? I only ever check the tail blades...its quite suprising just how far out they can be.

Clutches are not worth the effort, though checking the fan/clutch assy is not a bad idea...certainly the fan is worth checking out..more important is the run out.

Power settings can be an issue with most vibe cases. I struggled with my Predator gasser for some time...until being kindly shown that the mid point power was too high. I had chased the vibes for some time...dialled in the revised power setting and viola! a much more settled machine.

Quality takes........time!
07-04-2009 12:32 PM
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datidun
Senior Heliman
Location: n ireland

My Posts This: Topic  Forum		i plan to fly the new titan se with 600mm rotor blades any benefit of jumping to 620mm ,thanx
07-04-2009 08:53 PM
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predatorman
Senior Heliman
Location: Falkland Islands

My Posts This: Topic  Forum		There might be. Its suprising what that extra 20mm can do in terms of lift.

I wont profess to know a great deal, but it seems to me that since the average RC heli blade doesnt have washout then the outermost part of the blade has a great influence on overall lift. I tried flying a Hawk with short blades...around 500mm I think they were...switched to 550mm and what a massive change.

Quality takes........time!
07-04-2009 09:51 PM
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Yug
rrMaster
Location: UK. Herts

My Posts This: Topic  Forum
Quote 
There might be. Its suprising what that extra 20mm can do in terms of lift.
not really given the lift is a function of r^2

Quote 
cant see the point balancing blades or
Can't stress enough how important it is to balance every rotating part. Any inbalance results in loss of energy and undue wear of mechanically linked components.

Vegetable rights and Peace
07-05-2009 02:06 AM
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aadams1278
Senior Heliman
Location: Wilson, NC - USA

My Posts This: Topic  Forum		datidun,

i don't know. i've been running 620s on my raptor titan since i tossed the woodies and i've had mixture and high temperature issues ever since the hot summer temperatures came(90F+).

through a LOT of guidance, i've nearly narrowed it down to simply longer/heavier blades putting more load on the engine. of course that has a lot to do with my fuel. i have been using 15% cool power. just this past week i tried 20% nitro as well as some 600mm blades and the difference has been significant.

if you use high nitro fuel, or don't have hot/humid weather conditions to deal with, you'll most likely be ok. especially if you're not pushing the heli to its limits doing 3D.

it's more stable, but less responsive with 620s
07-10-2009 04:43 AM
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Main Discussion > cant see the point balancing blades or
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