Anyone know this formula?

[e-geezer]

So far, I've only flown 3-channel (elevator, throttle, and rudder). I want to go 4-channel (aileron) and I want a slow-flyer to do it.

I design and build my own planes. I believe that the lower the wing loading (ounces per square foot) the slower the plane will fly.

Can anyone give me a formula or table with minimum flight speed on the left hand side and wing loading on the right?

[slipstick]

Do a search for "stall speed formula. A very rough estimate is:

Square root of wing loading x 4.5 (or pick your own value between about 4 and 5 ;))

e.g. wing loading 16oz/sq ft, square root = 4, x 4.5 = approx 18mph.

For an accurate answer you need to know wing area, the density of the air and the maximum coefficient of lift.

Note that ailerons are much less effective at very slow speeds so you could have fun if you make it too slow ;).

Steve

[e-geezer]

Thanks Steve,
Just what I need - a nice simple formula! :)
What speed do you think I should go for? Assuming calm conditions.

[DRETW]

You might want to look at www.roomflight.com , in tech tips at the top of the page is a really useful calculator, it includes what you ask plus more.
Ted

[BMatthews]

Even calmer days have some turbulence. I'd shoot for a stall speed of around 8'ish mph. That's a speed typical of many lighter 2 meter beginner gliders. I think you'll find that such a speed is a good compromise for calm to lighter medium conditions.

[vintage1]

I find it very hard to get much slower that 12-15mph stall on any model.

With ailerons, its much easier to handle turbulence, andc you WILl want to gly inm slightly gistier conditions. I'd shhot for about 14mph, which is well withinghand launch range, and about 50W/lb or a bit more. That gives you plenty in reserve. And the overall model weight will be high enough not to be tossed around too much in 5-7mph breezes.

[adam_one]

Thanks Steve,
Just what I need - a nice simple formula! :)
What speed do you think I should go for? Assuming calm conditions.As a rule of thumb the stall speed in mph is approximately equal to four times the square root of the wingloading in ounces per square foot.
But if you know the whole wing's max lift coefficient, you may get a more accurate result with following formula:

Stall speed (m/s) = [2*Weight / (Clmax*1.225*Wing Area)]^ 0.5
Where the Weight is in Newton, Area in m2 and standard air density 1.225kg/m3

Or try following link:
Calculate stall speed (http://adamone.rchomepage.com/calc_stallspeed.htm)