Scratch building a Windward w/ extended wingspan

[why2cay]

I have just finished the fuse of a Windward sailplane using a set of 70's plans. I am now cutting out the ribs for a 88" wingspan. this is 16" more span than the stock 72". I want to leave it as a diheadral wing (as this was the predecessor to the Windfree}. My question is this, how much diheadral do i use in the wing? Thanks for your help in advance

Thermals,
steve

[kzimmerm]

I built one of these during the mid-70's. Does that bring back memories... What is wrong with the existing dihedral? ... considering you are adding only 8" per wing panel...

Kurt

[dinchl]

I also built one back then. Still have the plans(which are not in one piece). I slope soared it in SoCal. Folded the wing pulling out of dive. Built another wing with spuce spars. Would like to see pics of yours.

Dan

[why2cay]

kurt,
I thought about that, but just wanted to make sure there was no set rule for the diheadral.

thanks
Steve

[why2cay]

Dan,
I will post pics of the progress of the build of the wings.

Steve

[histarter]

I have just finished the fuse of a Windward sailplane using a set of 70's plans. I am now cutting out the ribs for a 88" wingspan. this is 16" more span than the stock 72". I want to leave it as a diheadral wing (as this was the predecessor to the Windfree}. My question is this, how much diheadral do i use in the wing? Thanks for your help in advance

Thermals,
steve
I have found that a simple evaluation works for me.
Wing tip height relative to wingspan. One inch for every 14 inches of span seems to be popular, and works well for slope with ballast. thermalling empty (light) one inch for every 12 inches of span yields a bit more roll authority for working lift (my personal preference). :D

[Flyinb]

I also built one back then. Still have the plans(which are not in one piece). I slope soared it in SoCal. Folded the wing pulling out of dive. Built another wing with spuce spars. Would like to see pics of yours.

Dan

HeHe....Built one as well in the early 70's (my first sucssesfull rc plane) and also sloped in so. cal, palos verdes area. Looks like you can still get kits here http://www.skybench.com/slnost.html

Bruce