ORIGINAL: mr_matt
ORIGINAL: olnico
Fully balance your elevators.
LOL where have I heard that before :-)
Seriously, great post, this spreadsheet looks as good or better than the one I have been using (which is not free).
Does this software take slop into account? I like these tiny servo arm lengths for a lot of reasons but it seems to magnify the effects of slop.
Thanks again for the great post.
LOL sorry for the suggestive sentence
...
You're perfectly right Matt. The short arms do "amplify" the servo slop. It is very easy to understand. A 0,05" slop over a 1" inch travel is 1/25 in ratio. A 0,05" slop over a 1/2" travel is 1/10 ratio and become not so negligible. In that case, the slop on the control induced by the servo will be doubled compared to the previous setup.
This is why I mostly use JR DS 8611A for most of my big planes. Only a couple of $ more expensive than the DS8411, almost the same size, and much more powerful with no slop.
This freeware does not take the slop into consideration in this page. However ther is a "buzz" page that computes the flutter resonnance. Have a look at the complete spreadsheet here:
http://www.geohei.lu/olin/data/model...calculator.xls
Courtesy of Craig Tenney.
The spreadsheet was originally posted on the Michigan State College of Engeneering and I assume that he was a student there. Unfortunately have never been able to reach him...