AeroTech Pitts Python 50cc

Rudder finally fitted along with Horizontal stab.

A bit of a quandary now. The two elevator halves each have three 25mm Mylar hinges. I was thinking maybe add two per elevator (easiest mod) or fit three Kavan hinges. The stab is 11mm thick and so is the leading edge of the elevators which is bevelled. There is not much balsa depth on the elevators which is why I am discarding the plan of 1/8th Robarts, especially after the frigging about hinging the rudder with Robarts. Although using stock components these planes were used successfully at IMAC some years ago according to reports.

Am I being concerned to much? Just use what was supplied?

I personally wouldn't use normal mylar hinges on a 50cc Phil, I wouldn't trust them to be strong enough. For that thickness of surface I think flat pinned hinges like the Kavan ones would be the way to go, minimum of 3 per surface.

JonTappin wrote: I personally wouldn't use normal mylar hinges on a 50cc Phil, I wouldn't trust them to be strong enough.

That was my line of thinking Jon but asked for those with more knowledge. Kavans it will be with pinning.

Best method of slotting other than scapels and craft knives?

Use a dedicated slotting tool and guide. The tool looks like a flat blade with a "V" cut out of the front edge. The guide centralises the slot. A second tool is slightly hook shaped and is used for picking out the material removed by the slotting tool. When fitting flat hinges, I drill a 1/8" hole on the centre line of the slot, then cut the slot. The hole is to enable glue to be squeezed in. I prefer to use canopy glue when fitting flat hinges, quick, and easy to clean up. I have slotting tools in two sizes, you're welcome to borrow them Phil.

Many thanks Brian for the offer. Hinges I have are 20mm wide. Have to arrange a meet up.

Phil, I have a set of hinge cutters too, I'll keep them in the car for when we next meet, Sat PM?