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Charlie's eplanes
Bleriot III

You may click on any picture to view a larger size.

frontentire.jpg

Ikarus Bleriot III with wing warping.

frontcomposite.jpg

Front view showing warping positions.

wingwarpingdrawing.jpg

Conceptual drawing of wing warping.

blsparbracketsrear.jpg

Closeup of hinged rear spar brackets. Taken from underneath plane.

blfrontview.jpg

Front straight spar bracket tied and epoxied to the stock mount that has dihedral. The modified wings have only around 1º of dihedral.

biiifrontspar.jpg

At the suggestion of some of the kind people on the ezone I lashed very thin CF rod to the front, main CF spar, ran it along the leading edge of the wing and wraped it around to the trailing edge. The photo above shows the lashing technique and the relative sizes of the rods. In the "front view warping" photo at the top of this column you can just make it out. I glued it with UHU Por and taped it. This stops the wing from being ripped if it runs into something.

rearcomposite.jpg

Rear view.

blunderneath.jpg

View from under plane. Rear king post to left. Warping lines pass from upright servo through 1/8" OD Teflon tubing tied to king post and out to wing spars. Hinged spar bracket shown behind king post where it meets the fuselage.

blbottomrearkp.jpg

Closeup of bottom of rear king post. Lines are of Cabela's Ripcord™ Si Plus Xtra Body 20# test Kevlar fishing line. It doesn't stretch and the Si allows it to slide easily.

blfront.jpg

Front view of plane with wings and wires attached to front king post.

biiitape.jpg

Another modification I did before the warping was also suggested by someone on ezone. I ran tape across the gap between the wings. This eliminates the inefficiency of having four "tip" vortices. Another way of looking at it is that it traps the air better. The plane gets more lift. The tape isn't shown in the warping photos, but I replaced it afterward.

Flight Characteristics:

As may be seen in the warping photos at the top of the page there is more effective down aileron than up. This causes large amounts of adverse yaw. A significant amount of rudder is required to make it turn at all. Even at that it still turns in a more natural, "follow the ailerons" manner than it did when using just rudder and dihedral.