Zenith Aircraft Builders and Flyers
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Flaparon counter weights
Has anyone weighed their counterweignts after balancing? It would seem that this should be a known weight that would not vary builder to builder if the flaparon was built per plan. There may be a difference on the inboard and outboard flaparons. Your input appreciated.
Replies to This Discussion
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Permalink Reply by Jim and Amelia Isaacs on
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Interesting question David. I was not aware anyone was balancing flight control surfaces on any Zenith aircraft.
Jim
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Permalink Reply by David Banahan on
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Sorry I didn't specify. I am building a Zenith 750 Cruzer.
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Permalink Reply by Carl Orton on
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Well, there are options such as paint or wrap that might require an ounce or two of adjustment. Or perhaps someone used larger rivets than they had to use. Just tossin' out ideas here...
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Permalink Reply by Gary Reed on
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Carl is correct. Everyone will build a little differently. Most of the difference will be the weight of the covering; I.e., how many coats of paint, how thick the paint coats are, or the thickness of any vinyl wrap.
Commercial aircraft have these factors down to a science but, of course, a home-built has much wider variances of finished weight. Best to just hang it on a fulcrum and do it from scratch.
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So the Cruzer drawings or build instructions call out flight control surface balance criteria? There are none for the 701.
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I read somewhere that the counter-weights are called for on the Cruzer because it is a Single Strut Wing and has different requirements for flutter control/testing. I think the regulations give the designer/manufacturer/builder the option of conducting high-speed dive testing to prove flutter does not occur or you can balance the control surfaces. Balancing is probably the safer and more consistent method when dealing with the variables of home-built aircraft.
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No they do not.
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Permalink Reply by Ralph Powell on
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David,
I copied someone's idea from this forum where you cut a section out of the middle of the counter weight, drill and tap as needed to add a screw to hold things in place, and replace cut out section with fender washers, as needed. Balanced the flaperons and painted the weights bright orange in the vain hope that I would not hit my head on them if I could see them. They look very good and can easily be adjusted as paint or vinyl is added to the flaperons. I had a local metal fab shop do the cutting and tapping of mine. Somewhere on this forum someone posted pictures of the process and explained sizes of washers and screws needed to make it all work. Much, much better idea than grinding the weights down.
Ralph
N750RP
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Permalink Reply by geo. keyes, jr. on
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Ralph,
it sounds like a very 'tight' solution which allows for future adjustments if details are changed or added later. i briefly searched for past posts... i would love a photo or link. thanks for this info. geo.
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Search in 750 Cruzer Forum. Use "counter weight" as search term. Lyndon has a written description and photos. I found using washers made balancing flaperons very simple. If you use this method, make certain that the section you cutout is beyond the rounded nose area. It is fun to read and look at pictures of the creative and impressive methods folks have used to improve the looks of the counter weights.
Ralph
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Permalink Reply by Greg Kulosa on
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I know this thread is ancient - but I'm currently building my Cruzer - and I like the idea of this alternate way of being able to add/remove weight to the flaperon counter weights with washers.
I've searched on the site, and I cannot find the original post that you refer to. Does anyone have a link to the original post, or maybe pictures of your own version of flaperon weights that are threaded in this way?
Thanks for any info.
Greg
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I think I found it:
https://zenith.aero/forum/topics/flaperon-counter-weight-mod-to-hel...Still would love to see pictures of how anyone else approached this. Thanks!
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