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Helicopter
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Align
Other › 450sa help
11-22-2006 06:39 PM  11 years agoPost 21
caseyjholmes

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Portland, Oregon

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well compared to the normal method of taking the blades of the heli and balancing it on a balancer and a scale , whats the advantage to your method?
a blade grip on one side can be longer than the one on the other side, or dampeneing, etc. If the blades are balanced on a scale only, they still might shake like crazy on the heli. This is when the tape comes in to play..

I learned this from Walt Ferrar (I can never spell his last name right!)
who is sponsored by Hirobo, MEdusa Research and others.. So I'm sure it is good info, and has worked for me many times. Once I learned this, my heli flies much more smoothly.

You have to do this to the tail blades too mind you, and it helps to do it with the paddles as well, before main and tail blades are installed.

I have to do a writup on this one on my website. I've typed it out too many times now

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11-22-2006 06:50 PM  11 years agoPost 22
oopsididitagain

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Dubai

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yes a write up would be awesome casey.

so u mean take of the main and tail , put tape on the paddles u until it doesnt shake with trial an error with increment of 1/2" tape(electrical tape?) then do u move on to the tails then only the mains or something?

sounds like a lot of trial an error in terms of where to place the tape , how long must it be and type of tape(thickness that doesnt affect flow?)

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11-22-2006 06:57 PM  11 years agoPost 23
caseyjholmes

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Portland, Oregon

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so u mean take of the main and tail , put tape on the paddles u until it doesnt shake with trial an error with increment of 1/2" tape(electrical tape?) then do u move on to the tails then only the mains or something?
Right. paddles first. Then install tail blades and balance them. Now, with tail blades and paddles installed and balanced, install main blades and balance them too.

Don't use electric tape. It slips off. Use standard scotch office tape, 1/2" - 3/4" wide stuff..

This thin tape won't effect flow unless you have a wind tunel and smoke pipe
IT only takes 5 minutes to do the whole proceadure once you get good at it, and it is worth the smooth flying vibe free heli it will create.

place tape on bottom of blade. start with 4" piece and trim accordingly once you find the blade that needs the tape. might end up having to add several 8" pieces of tape in some seriously shakey cases..
(imbalanced blades to begin with, rebalance on scale first and try again)

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11-22-2006 07:19 PM  11 years agoPost 24
caseyjholmes

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Portland, Oregon

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Thought I would add..

When I rebuilt my SA from it's first crash, I used an old and a new white plastic tail blade. They were way off balance when I spooled up, and this made the SA look like the rotor head was wobbling so hard, I thought it was the blades bigtime.

I took the main blades off, balanced the tail blades (required several inches of tape) and put the main blades back on without changing them at all. This solved the issue. It's amazing how a simple imbalanced tail blade will make the whole rotor head look like it is ready to fly appart into pieces..
Not to mention the nasty vibe tricks that can play on your gyro.

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11-22-2006 07:34 PM  11 years agoPost 25
oopsididitagain

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Dubai

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casey: thanks a lot for the procedure i will note that down , is it clear scotch tape or those half transparent ones? and means you don't overlap them on top of one another?

do you place them on the rib of the blades or the tip of the blades? (thicker or thinner side) ? and do you put them in the middle, inner towards the rotor head or the furtest possible on the blade?

so you never really balanced your blades on a scale and using those blade balancer?

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11-22-2006 07:52 PM  11 years agoPost 26
caseyjholmes

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Portland, Oregon

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I balance on a gram scale first, then slap 'em in the head for rotational balancing to the rotor.

start from tip of blade and work your way in. Overlapping doesn't matter, but of corse better adherance is obtained by applying straight to the blade covering, and not on top of another piece of tape (unless you have to, to get it balanced)

Place tape directly on the center of the chord. Not hangin off the trailing or leading edge. No need to wrap anything AROUND the blade but tracking or flash tape.

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11-22-2006 09:12 PM  11 years agoPost 27
oopsididitagain

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Dubai

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would be really nice for us newbie if you could do a write up casey.

and you length of 4" does it only apply to trex or from bcp all the way up to raptors?

so on a gram scale , you put tape on the middle of the blade until both blades are the same weight?

then slap em on the rotor head , then only u start to cut the tape down first or shifting it further inside of the blades towards the rotorhead.

You dont have to u se the gram scale on the paddles and tail blades do u ? ( anre are they .01 scales?)

sorry i have so many question this technique seem so new to me and i have no idea what u mean by trial and error to do it. and why does electrical tape slips off? i've seen people use it for tracking?....

thanks a lot again

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11-23-2006 06:12 PM  11 years agoPost 28
oopsididitagain

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Dubai

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any updates casey?

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11-23-2006 08:08 PM  11 years agoPost 29
drdot

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So. California, Orange County.

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fwiw..

In looking at your initial picture, it looks like you have the ends of the cage reversed...hubs go in, not out...5mm is a build error, even Align can't make parts that bad...

John.

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