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Pitch gauges

Old 05-15-2002, 11:17 AM
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xp8103
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Default Pitch gauges

A buddy and I were setting up my Xcell 60 lastnight (he has the tools and the know how...)
He has a Robart pitch gauge which he has used with pretty good success. The only question I have is the accuracy of the "jeweled movement" degree scale. Noticing that the actual guts of the Robart unit are the same as their incidence meter and knowing how "exact" it can be at times, we would set a particular point and then move to the next. But as I started to adjust that point, we might move below the previous point, curve-wise according to the readout on my Tx. So, cycling the blades thru from first to last point and then returning to the point being set would show a different degree, forcing more adjustment on the tx. While I think we have set it up fine, my question is, is there a better way? A better pitch gauge - something with more accuracy? Anyone make a digital unit?
Old 05-15-2002, 12:46 PM
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fritzthecat
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Default Pitch gauges

The Robart unit is one of the more accurate pitch gages. Most others rely on you eyeballing the top of the gage to the flybar.
What you are seeing is the inherent slop in the pitch and cyclic control system. If you grap the blades and twist them while the pitch gage is on then you will see at least a degree or two of movement. The easy way to get consistant readings is to move the pitch stick the same way every time before adjusting the numbers. So start out at 0 deg, install the gage, wiggle the blade back and forth to find the natural center. Then do the positive part of the curve. Go all the way negative then move up to the desired positive stick position and adjust. Then move the stick back down and then back up to the next positive position. Once the positve is done return to zero and do the negative curve the same way (go all positive first then to desired neg position).
With the build in slop in the control system, you will get different pitch readings when you move the stick from neg to pos vice pos to neg. So always move the stick to the desired position from the same direction to get consistant readings.
Fritz
Old 05-15-2002, 01:12 PM
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Hivoltage
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Default Pitch gauges

A pitch guage is just to get you in the ball park anyhow. You will do the fine tuning when you get to the field.
Old 05-16-2002, 12:10 PM
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xp8103
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Default Pitch gauges

Thanks guys... Fritz, what you describe is essentially what we ended up doing.
Old 05-16-2002, 12:31 PM
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Dazzler
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Default Pitch gauges

Hey guys, quick question: I was talking to a guy at Ricks Helicopters yesterday, I was going to order a pitch gage and blade balancer, and he said that I really didnt need that stuff, so I didnt order it. Looks like from the above post a pitch gage just gets you close, but I'm working on a JR Venture, and maybe the blades comes set close out the box, and I can just tweak it from there. What do you think from experience, should I get these items? Thanks, Daz...
Old 05-16-2002, 02:48 PM
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Ergo60
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Default Pitch gauges

I use the in expensive Miniature aircraft pitch gague, and only set the low, middle and high with it. I adjust from there at the field. But I find the gague in-dispensable for getting the starting values, and I use it all the time. I do not use it to set all 13 points o the curve though, this is done with lots of time at the field(Backyard)
Old 05-16-2002, 04:45 PM
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tisrich
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Default position of pitch guage?

While on this topic am I wrong to assume that if a blade has no washout then the guage can be placed near the rotor head, correct? This is what I was told since I normally measure from the tips. I have noticed that it appears I do get a more accurate read nearer the head though since there is less vertical play. Or does it really not matter?
Old 05-16-2002, 07:32 PM
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DavidH
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Default Pitch gauges

The outer 1/3 of the blade is what creates lift. And with blades that have washout, if you measure inward next to the root, the tip of the blade will have anywhere from 1.5 to 2.5 degrees difference. That is why the washout is in the blade to give the inboard area of the blade less drag while the tip is doing the work. Washout blades work well for contest type flying and when you want the heli to be faster.

David

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