# Recent content by cvairwerks

1. ### P-51 Mustang Replica Tehnical Question

The fuselage longerons are one of the trickiest items for building one from scratch. Last time I saw some for sale was about 20 years ago and they were getting 8 grand for the set of 4 parts. Screw one up and they would only sell you a set.
2. ### P-51 Mustang Replica Tehnical Question

Something to understand about certain skins used on the Mustang...they were formed in a stretcher press. There is no way to form them otherwise.

9. ### Drill bit sharpener or new bits?

Buy your bits in bulk from one of the better known suppliers, such as MSC, McMaster-Carr or others. Stay with the better brands such as Cleveland. You can’t recover the cost of a decent drill sharpening rig when doing a single aircraft. Look at the cost of a Darex or Black Diamond sharpener for...
10. ### Bolt holes, burr and fatigue life effects

Orange wire or yellow wire, depending on the company is flight test instrumentation wiring....
11. ### Bolt holes, burr and fatigue life effects

David... What programs were you an orange wire guy on? The NF-16 was one of the last -16's I built before going to the orange wire world for a number of years. :pilot: F-16, F-111, A-12, F-22 and a bunch of weird stuff was my world at that time.
12. ### Bolt holes, burr and fatigue life effects

Lol Mark, I was meaning to look at the relevant section on the hole stuff and not read the entirety!
13. ### Bolt holes, burr and fatigue life effects

It gets deep into fracture mechanics, but essentially a burr creates a very localized stress riser. Depending on a number of things, that riser can lead to localized cracking, at loads or fatigue cycles way under the design limits. Go thru the Aloha 243 investigation report for some analysis on...
14. ### Cable pulley tensioner/mount

Adding 12 ounces of additional weight to eliminate a 3 ounce turnbuckle in a system where weight is the enemy, is a sign of not thinking this through completely. Also, only relying on sliding friction with minimal clamping pressure is not a good design. Call it what you want, but consider...
15. ### Cable pulley tensioner/mount

You do realize that a complete turnbuckle assembly weighs less than 1/4 of what your slider contraption does? Using two bolted swage fittings makes the junction longer than the turnbuckle assembly too.