G'day

I think, from your photos, you are trying to make what are called STRUTS. These are the (usually wooden) pieces which go between the wings of a biplane. Am I right?

If that is the case, you can use any soft wire (bike spoke would probably be OK) that you can bend to the shape you want.

There are two common types of wire found in hobby shops. This has previously been mentioned. They are called piano wire and I call the second type, pushrod wire. Piano wire is very hard and springy. It is hard to bend and tends to spring back to its original shape. It is used for things like undercarriages where strength and spring characteristics are needed. The push rod wire is much softer, easier to bend and does not spring back if you bend it too much. It is often threaded on one end so it can be fitted with a clevis which is the fitting you use to connect to an elevator or rudder or aileron horn (the horn is the (usually) plastic fitting which is on the movable surfaces so that the servo can make them move.)

A SPAR is usually the long structure inside a wing, usually at about the thickest part of the wing, which gives the wing its strength.

To make struts I would use the softer wire as you need to bend the ends so you can connect them to the wings. There are many ways of doing this. One plane I built (Cirrus Moth) used balsa struts which were made with a piece of soft wire sandwiched between two pieces of balsa. The ends of the wire had hooks on them which hooked into little loops which poked out of the top and bottom of the wing.

The struts on the Tiger Moth I have are made of harder wood and do not have any wire fittings but have flat metal fittings which hold them to the top and bottom wing. I could take some photos if you want.

I hope some of this makes some sense to you. I am sure people here will be pleased to help if they can.

Cheers

Mike in Oz