Hatz Biplane Association

Thanks so much Doug! Really appreciate it.

Blue skies,
Keri-Ann

The rib template is not on the Makelan cd. Sent you a pm.

I will have to check my CD, I only remember pictures of the build, which seriously needs updating.

Could someone e-mail a copy, ribs & fittings? Use my PM an I will forward my address to you.

Blue skies,
Keri-Ann

... rib material and spars on order!

The full size rib drawing is in the plans. I also have it electronically along with the cad drawings for most of the flat steel parts.

John, where did you get the full size rib drawing from I see on you jig table?

Thanks for the feedback. It's why I asked. No big concern.

Thansk again,

The process does not need to be elaborate, beyond the spacing for the spars. Now is the last time the ribs will be measured. The picture someone included above appears to be an eligant approach to rib building with the duplex capacity and screw clamps. EAA Tips for Homebuilders has an excellent video on rib building. Other examples are even more imimalist in approach. Some adaptability of the jig is desireable because there are at least 4 different configurations of the "standard" rib plus the smaller tip ribs. You probably won't want to build discrete jigs for each.

I agree with John. The ribs have a fair amount of flex in them when completed so I seriously doubt the 3/32 bow will make any difference. As John said, if there is a bow you can straighten it on assembly, but again, I doubt you'll see any effect from the jig.

Don't make a science experiment out of it... if you are really concerned build one as a "practice" rib and see how it turns out. I think you'll be fine.

Hi John,
Don't get too wigged out on some of this or you will never get done. We just plotted the airfoil out on a plywood table top, glued some locating blocks on and
built the ribs. Your ribs will be somewhat flexible and can be lined up straight during the assembly to the spars.
John Hanson HC-012.

Due to heat and humidity extremes here in South FLA, maintaining flatness of any fixture when working with wood is a concern of mine. My cabinet maker friend and I built a box out 3/4 oak ply to hopefully maintain flatness for however long it is that I'm building ribs. Once the box was built the bare wood was as flat as wood will ever be. After gluing on the Mylar template, there is about a 3/32" bow from tip to trailing edge. Could be expansion of wood from glue, could thick glue in various locations, etc. Anyone have to deal with this? Is the bow a major concern, or will this true out during construction? Obviously I can built another box and template, but if this is not any concern I won't waste the time