Sail Planes / Gliders

[TX-EcoDragon]

I meant to mention before that you also might not want the ailerons to go all the way to the tip of the wings. . . it will be easier on you to leave one section between the last two ribs intact. Hopefully that leaves enough span for some aileron authority.P.S. only one e in aileron. . .:-PS!TX-EcoDragonBlack 1TX-Squadron XO

[TX-Kingsnake]

Aileron aileron authority=enough? http://members.cox.net/messerschmitt/a/AILERON10-3-07.zipS!

[TX-EcoDragon]

hmm. . .it's not much is it! That would probably work, but if you could, I'd probably want to try to extend them if pssible. . .the problem will be that you will need lots of travel of those surfaces to get much roll response, and that will cause a greater drag penalty than a longer aileron would.Also, bevel those surfaces. . and close the gap between the aileron leading edge and the trailing edge of the wing.Sorta like this: S!TX-EcoDragonBlack 1TX-Squadron XO

[TX-Kingsnake]

After changing the linkage as you mentioned and beveling only the aileron I got 58 degrees up and 58 degrees down of aileron rotation. That is huge, maybe too much. I might be maneuvering in a very tight range on the stick. What roll rate will a 9 inch aileron poduce with 58 degrees of aileron deflection?  http://members.cox.net/messerschmitt/a/SERVOARM10-4-07.zipS!

[TX-EcoDragon]

You only bevel enough that you can get maybe 30-40 degrees of travel. That would mean no more than around 15-20 degrees of bevel per surface. . . obviously you don't need to use all the travel of the surface, but it sucks to need more and not be able to get it with a rebuild. I'd probably go with 15 degrees as the compromise. The reason to not overdo the bevel is that it will make it harder to retain structural integrity the more steeply you bevel. I just looked at your plans, the reason you have so much travel is that you have a huge gap between the aileron and the trailing edge of the wing. If you have a 10 degree bevel on only the aileron, the travel should be about 10 degrees with no gap. . .a bigger gap means you will get more travel than you have bevel. Here is an interesting page that shows various types of hinglines. You don't need anything fancy, just a standard hinge setup such that there is next to no gap. http://www.robart.com/how_to/hinge_points.aspxS!TX-EcoDragonBlack 1TX-Squadron XO

[TX-Kingsnake]

With little gap and a bevel the rotation point is still 50 degrees up and 50 degrees down. Aside form moving the horn aft, not in the same center point of rotation as the hinge pin, I am befuddled as to how I could reduce the rotation of the ailerons to 30 degrees up/down. http://members.cox.net/messerschmitt/a/50%20deg%20rotation%20animated.htmlCool graphic, you like?S!

[TX-EcoDragon]

That is a very cool graphic. . . and that looks perfect to me. It's nice to have a little margin for error. You could do with less bevel if you needed to maximize the amount of spar there, but I think what you'd drawn there should probabl;y work just fine. You just need to be certain that the hingeline has sufficient strength at the spar, and a decent place for the hinges to affix.If you needed less or more travel you just adjust the pushrod positions on the horns. As an example, moving the pushrod at the aileron horn down a hole would reduce the surface travel.S!TX-EcoDragonBlack 1TX-Squadron XO

[TX-Kingsnake]

I tried moving the pushrods down a hole and it didn't make enough difference. This link compares moving the control horn aft against aligning it with the hinge. Is this out of alignment option posing a threat? It sounds goofy to move the hinge out of alignment with the control horn. Out of all the options I have tried for the linkage it seems closer to a rotation within reason. http://members.cox.net/messerschmitt/a/rotation%20comparison.htmlS!

[TX-EcoDragon]

Don't move the horn aft, keep it on the hingeline.S!TX-EcoDragonBlack 1TX-Squadron XO

[TX-EcoDragon]

Maiden flight of the Cappuccino 2.6M Extreme Triple Carbon. These were taken about a year ago at my local thermal flying site where I could put it on a winch and trim it out - of course this is a speed machine, not built for thermal flying, it's built for going 230 mph in high winds so it didn't stay in teh air long after a launch. Zoooooom

[TX-EcoDragon]

My first control tower combat soaring session. . .

http://www.youtube.com/watch?v=nSjf8YbeGWc

 

[TX-Gunslinger]

That's way too cool.  Looks like a lot of fun..

Thanks,

S~

Gunny