Gurney Lip

[Rick Iverson]

Gents;

I’ve been thinking about this. Applying Gurney wickerbills to the winglets, canards, diffuser and rear wings, I got my panties in a wad about making them moveable longitudinally, to fine tune if you will. Then, an epiphany.

Why not just epoxy them and micro adjust the angles of attack of the aerodynamic surfaces? Can’t do the diffuser nor lower rear wing, but everything else is manageable. Thoughts.

V/r

Iverson

[Bardahl77]

My understanding of the aerodynamic effect of a Gurney flap is it's performance is based on the sizing of the flap according to the wing chord and the size of the boundary layer. I'm not sure what you mean by moving them longitudinally, do you mean along the length of the wing? Which would mean there were gaps in the flap?

I've also wondered how a Gurney performs in conjunction with large side plates. Also, from what I read the flap tends to add drag on smaller wings, and I think they would be useless on any non-airfoil shape like a dive plane.

Who's got a wind tunnel?

[S Lathrop]

The description of a Gurney that can slide forward or back on a wing is usually called a Slider. It increases the the wing force by increasing the cord of the wing and it is quite effective. It is thought to be a lower drag alternative to increasing the height of the Gurney.