I received a lot of good replies to my first question.....
http://www.rcuniverse.com/forum/m_50...tm.htm#5252455
Now that my flap installation is complete, and since I have never used flaps on ANY of my planes..... I am wondering how much elevator should be dialed in when dropping the flaps for landing? Let's say @ 45 and 90 degrees of flap. This is a Skybench Aerotech XL Big Bird, electriefied, and has a flying weight of about 59 oz. I ended up making my flaps 20" X 1.75" each side, and a stock size elevator is on my Bird.
I am assumming that this amount can vary, even on the same type of aircraft. I am looking for a "safe, approximate", setting so I have no ....... let's say..... unwanted surprises. (Stalls, or worse, a sudden dive for mother earth)!!!

How much elevator compensation to program in, is hard to tell, it varies with every airplane.
But 20" x 1.75" are some biga** flaps, so it will requiere a hefty amount of down elevator to compensate for them.

For example, I used to have a CHK Cumulus e ( 130 " WS, full house, e-powered, built-up wings ), it required almost the complete available down elevator travel to keep the nose down, when I applied crow, with the flaps deploying to approx 70 deg.
On my 4m all molded Valenta Thermik XL, it takes about 0.5 in of elevator down to compensate for the flaps.

My suggestion is to fly with the flap-to-elevator program open on your radio. Also- be aware of which way is "up" or "down" in your program. Get up to some serious altitude and drop the flaps. It'll probably loop or try to, anyway. Dial in some compensation and try again. Be aware as your speed bleeds off the plane will change its attitude since the elevator effectivness will vary with speed.

What I've found is the plane will "hunch" at cruise speed, slow down, then drop its nose as it slows to a crawl, but again, every plane will be slightly different. I prefer to land with the plane on a gentle "down" line so I simply pull up to flare. Oh, and dont forget to raise the flaps just before you touch down so you dont drag them.

I would pick one landing setting, and IMHO make it 90 degrees. I have a 100" slope racer that will slow to a crawl with 90 degree flaps, and its a tank. Hand catches are easy.

You may have 10 landings to get it right, but I would dial in about 20% down elevator to start out with (frankly thats not near enough for 40 total inches of flap, but its a safe start) and apply them slowly about 100 feet up so you have plenty of time to react.

That is about the amount of flap I have on my Skybird and and I was mixed in at about 35% as I recall. I am switching radios though and I will have to go through this all over again.

Using the five point adjustment for elevator to flaps I pull in a lot of down elevator at first, then back it off as the flaps go past the 45 to 50 degree point then take most of it out.

WOW Guys,
Some great info from all. Thanks a lot. I was glad I ask because I did not realize the amount of down elevator needed. I realize, each plane is different........... but it looks like you all talked about more elevator than I would have suspected. This is a big help because I would have been taken by surprise if I had not have asked. Thanks again ....lownslo

I've only done it with my Katana Mini, but I just take mine up to about 200ft and bring the throttle back to my landing setting. I kick on the flapperons and then adjust the elevator manually and take note on the stick position. I then land her without flaps and bring her in. Then on the ground I see how much travel the elevator had at said stick position, and then I program it in. After that, I fly in the program setting and fine tune it from there. I've found I can get it set in usually the second flight like that, at least that's with my acro planes.