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The phrase swash leveling is actually a misnomer. We are actually making sure the swash is perpendicular to the main shaft in all geometric planes or more correctly described as "normal to the main shaft". If the main shaft was perfectly vertical, then the swash would be perfectly level. The reality is that the main shaft in most helicopters is not vertical so whats important is not that the swash is level, but that its normal to the the main shaft . For simplicity, lets continue to call it a level swash.
Why does this matter? It matters because a level swash is a prerequisite for making all blade control symmetrical. We control the swash and the swash controls the blades. If the swash is not level, an error is introduced in what the blades are told to do.
Don't be fooled by your tools
Nothing is perfect. As much as we would like to adjust everything to be perfect, nothing is perfect. There are limitations on how precise every mechanical part can be made and these same limitations apply to the tools we use to make measurements. We can only be accurate within the limits of the tolerance of devices and tools we use.
For instance, how accurate is the pitch gauge you are using? With all those digits after the decimal point, they look like they are extremely accurate but are they? You can convince yourself of its limitations pretty quickly by measuring an edge of a fixed triangle ten times in a row and then comparing the measurements when you are done. Then, flip the triangle so that the gauge is measuring the negative of what it was previously measuring and do that ten times. You will find that not only will it not measure the same tens times in a row, but there will be a difference between the average positive and negative pitch that it can measure. A good gauge will give repeatable accurate results for both positive and negative pitch within an acceptable tolerance, but don't be fooled into thinking you are getting accuracy to .1 degrees.
Now consider the slop in linkages and any moving part. Each linkage and each moving part moves accurately, but within an acceptable tolerance. You may well have .3 degrees or more of slop in the system that you thought you were adjusting to within .1 degrees.
Compounding this, the procedure you use to setup your system can add additional unnecessary errors. If your procedure involves leveling your helicopter, then making measurements in relation to that position, realize the errors in that initial position will be added to every measurement you make thereafter, especially after you've bumped it a few times.
As we said in the beginning, all you really need to do is make your swash perpendicular to the main shaft. Thats why all my Swash Leveling Zip tools and USLTs make all measurements directly in relation to the main shaft. And best of all, no head removal is required.
KISS, keep it simple stupid and your swash will be level before the others even have their heli leveled.
Check out my Servo 90 and Zero Pitch Tools as well. They provide simple fast methods to complete all your setup tasks.
Here is a Helifreak thread from the first Zip Tool I made:http://www.helifreak.com/showthread.php?t=562984
The Swishy Thing
Product: RDLohr's Clearly Superior Products Swash Leveling Zip Tool
Posted By: Maypole
She said, "Why don't you hang it around your neck old man? That way, when you forget who you are, you can just read that swishy thing." I swear, I feel like Rodney Dangerfield.
Title: Rick killed this guys :)
Product: RDLohr's Clearly Superior Products Complete Swash Leveling Zip Tool Set
Posted by: Tony Whiteside (Pro Pilot)
was setting up my mostro , and I always set up by eye, I thought I get
these out to see how close I was, I was not to far off but I was off, I
feel these baby's are easy as hell to deal with and got me real close
to perfect , no more work than it take to use these, I think I will
Using them to get my head fine tuned, I'm really enjoy using them instead of cussing where I had to take the head off before with other swash levelers! Pretty sweet. ! There's a wide range of them 3, 3.5 , 4, 5 , 6, 8, 10, 12, 14, and 15mm size shafts
Simpliest Ideas = Best Ideas!
Product: RDLohr's Clearly Superior Products 8mm Swash Leveling Zip Tool
Posted By: bg
I can't speak highly enough of this swash leveling zip tool. I've used it for my Protos 500 and my Compass Atom and after trying a number of swash tools, including my go-to "eyeball" leveler, I've found this particular level to be outstanding! Best of all, for me, it cuts down on my helicopter set-up times which gives me more time for things I enjoy doing, like actual flying. I love that I don't have to take anything apart to adjust my helicopter's swash plate. Though small, this tool is durable having been through the wash, knocked about the house by my cat and stepped on. It's little things like those that show me I finally made the correct choice in buying the RDLohr level. Lol. Of course, the best quality of all is that it not only works, but works exceptionally well without the hassles I've experienced with the other swash leveling tools out there. As the title of my review states, the simplest ideas always seem to be the best ideas and RDLohr's Clearly Superior Products 8mm Swash Leveling Zip Tool is one of those.
Robert White/Rick Lohr
Robert White/Rick Lohr