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Post by dmar836 on May 1, 2016 9:41:39 GMT -6
I'm a little confused as to why there are very few numbers or recommendations for control surface limits, CG, etc. on plans for a plane that has been flown as much as the V Witt. I know I can set CG at say 25% of chord and test but elevator? 25 up, 15 down? I have not exhausted EAA archives or even my local experts but curious if there are standards that prevent designers from including them unless unique to their design?
BTW, if someone has stumbled on hard numbers quoted by Wittman, other than V speeds, I'd sure like to see them.
Dave
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Post by Supervee on May 1, 2016 11:11:20 GMT -6
Dave, Do you have V-Witt plans? Let me look at some of my historical notes from Neal LaFrance, the original builder of #7 Mr. Smiley V-Witt, and see if anything is mentioned……
Surprised to think that someone as respected as Wittman would not have any control surface deflections on the drawings….I am not near my office right now, but I will look for this stuff within the next day or so…Ed
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Post by dmar836 on May 1, 2016 15:00:09 GMT -6
Appreciate it. My plans are from Aircraft Spruce so may not be the most complete. I ordered them after I bought the project to check the accuracy of the build and see what wasn't there. They came with a reprint of the 3/70 SA article, a "poster" of photocopied in progress pics from #1, and rib templates. Plenty to build by but such setup details eventually arise. Perhaps there are "builder notes" somewhere but I have never seen them.
Dave
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Post by Supervee on May 1, 2016 17:19:47 GMT -6
I found some CG info of Neal LaFrance's, and stuck it in the mailbox…Have not found any control system travel limits., will keep looking…..
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Post by dmar836 on May 1, 2016 21:28:17 GMT -6
Much appreciated". Mocked up the brakes tonight. A buddy gave me some $1100 ea. Cleveland brake cylinders. I drilled/reamed a hole to align with my tabs and disabled the e-brake plungers. Looks like it will work.
Dave
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Post by Supervee on May 2, 2016 5:20:06 GMT -6
Wow…"$1100 ea."…?
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Post by dmar836 on May 2, 2016 5:53:14 GMT -6
That's new price each from Aircraft but I was shocked when I looked them up. Especially when I've rendered them useless for certified use and Matcos are only $100.
Dave
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Post by Supervee on May 2, 2016 6:34:22 GMT -6
That's why I put up with the lesser stopping power of Azusa mechanical brakes , and wheels….For a few hundred bucks, you can have wheels,brakes, tires , tubes, everything……
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Post by dmar836 on May 2, 2016 7:00:33 GMT -6
I'm sure these will be way overkill but I'm trying my best to use what's available to me or what I have. The wheel cylinders are integral with the backing plates and were badly pitted. I sleeved them and still need to ream them. I'll make my own pistons to size and use o-rings. Maybe in the end I'll chuck it all for mechanicals. Doubt it will need too much brake.
Dave
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Post by Supervee on May 2, 2016 7:47:51 GMT -6
On these little airplanes, brakes, for steering, are not the way to go. A good mechanical link between tailwheel and rudder takes care of steering….The brakes are only needed for run ups, in my opinion, and the Azusa's are only good to hold it for a minor run up…….
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