Ed

What is the best flap angle in degrees, that produces the most lift when landing ?

Ed

BobH

My Feedback: (2)

Depends on what you want. Flaps will either increase lift or produce lots of drag. A little flap 0-30 or so. Creates lift. Greater flaps give more drag than lift.

Ed

" produces the most lift when landing ? " I asked about LIFT . What flap setting produces the MOST LIFT ? ? ?

Boomerang1

Good, reasonable, accurate answer Bob, on a figure that will vary from model to model.

My answer would be if you want to type in large, coloured, bold, text with lots of spacing
between question marks you can shove your flaps where the sun doesn't shine.

John.

s3nfo

My Feedback: (14)

I love "How far is up" questions.
What airfoil are you using, what's the Reynolds numbers of the wing, taper or no taper, sweep back or no sweep back, high wing or low wing, barn door flaps or split flaps, how big a gap, what's the hinge type, percentage of chord, percentage of span???????

BobH

My Feedback: (2)

So Ed. Everything isn't simple is you imagined. No single number for you. No completely mindless button pushing or programming. You may have to establish what's the best setting for your plane!!
I gave you a range for lift. go try some out.

NickC5FE

My Feedback: (31)

Is it a split flap, a fowler flap, a plain flap, a slotted flap, a slotted fowler flap? Is it a flat bottom airfoil, a semi symmetrical or full symmetrical airfoil? Is the aircraft flying at a greater AOA?

YOUR QUESTION DOESN'T HAVE A ONE-SIZE-FITS-ALL ANSWER.....If you start a post about something requesting an answer, you should try and work on your internet forum dialogue.

In general, very general- split flaps will have a higher drag/lift ratio for any setting. This is due to the separation of airflow top/bottom of the airfoil. Fowler/plain flaps will have higher lift/drag ratio at lower AOA in most settings due to the increasing camber of the airfoil.

In short- go with the manufacturer settings.

dasintex

My Feedback: (10)

After the tantrum, it appears that Ed has disappeared!

Idigbo

My, what a rude individual. I hope you are just having a bad day and do not normally respond to those helping in such a disgraceful way!??

Ian.

lawrence b

Ed,
The angle that will give you the most lift is 26.34 degrees.
Larry B

FLAPSDOWN

You're a dope Lawrence, everyone knows it's 26.37 degrees! You should consider selling all your RC gear before you hurt someone.

No seriously, Ed if you're still listening, start somewhere say 30, and fly the airplane. Make changes in 5 degree increments until you're happy with the performance. I've flown many scale models that all seem to react differently. Some pitch up, some just slow down, some snap roll into the mower shed. No, not really,

If all this doesn't make sense to you, maybe I'll buy all your RC gear. Look me up.

lawrence b

Maybe I'll give up flying and get into R/C tanks. Wanna buy some R/C airplanes?

geoffnet

I just found this… not happy with some of the answers!

Researching for info on flaps for my 72" scratch-built DHC-2 Beaver, I found that the actual aircraft uses 15º down for take-off and 45º down (Max 50º) for landing, so that's what I'm using.

Hope that might be a little help.
Good luck with your build.