kenh3497

I'm working on plans of a Kraft Super Fli from the original drawings and would like to use the original airfoils used on the Fli. They are NACA 63A018 (root) & 63A015 (tip). The original pilot reported the Fli had some "landing issues" as it had a fairly high angle of attack before stall. In fact the tail wheel would touch before the plane would be in a full stall. It would also loose some points in spins because of it's "odd' stall characteristics. Now I'm no genius at airfoils so I may be barking up the wrong tree here.

So, does anybody have the numbers needed to generate these foils or should I be looking at something else?

Thanks!

Ken

limeybob

My Feedback: (6)

here you go
attached

Bob

kenh3497

Thanks Bob!! You're cooler than a preschooler

limeybob

My Feedback: (6)

Polars, note funny behavior at low Re

bob

kenh3497

Without looking I'll bet the 63A015 does the same thing. Maybe this series of airfoils is not the best to use for models???

Ken

speedracerntrixie

My Feedback: (29)

Ken, I think you will find that for this type of airplane that airfoil selection is not going to make much difference. The wing loading of our models is so much less then that of the full scale airplane that they really can't be compared. I would say that if you want to use the scale airfoil then do so.

kenh3497

I'm "in love" with that very thick airfoil at the root of the wing. It will be right at 2 3/4 inches thick. To me the Fli has such nice lines. Well i guess it is a classic

OK back to airfoils... I know the 4 digit NACA airfoils are very popular. They might be the better choice at least for the tip airfoil and leave the 63A018 at the root. This should ensure the root stalls first but looking at the graph it might have a funny stall . This airplane designing thing is starting to get above my pay grade

OK one last question, ya right What are some of the popular airfoils used for model aerobatic aircraft? Like I said, I want to use a very thick airfoil at the root as that is part of the character of the Fli.

Thanks!

Ken

limeybob

My Feedback: (6)

I use the NACA 0016

Bob

kenh3497

I decided to use the NACA 0018 at the root and the NACA 0015 at the tip. The tow airfoils are drawn and the basic wing planform is laid out. No in to creating the ribs so the wing can be built. I was given a tutorial on lofting ribs but it looks like WAY to much work. I guess I'll just have to break down an buy Profili of something simular.

Ken