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  1. C

    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.
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    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.
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    P-51 Mustang Replica Tehnical Question

    If you are going to build full scale, then just use the existing prints. Be forewarned that the cost for a flyable engine, prop, radiator and gear set are going to cost you in excess of $250,000 these days.
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    Presurization - Whats it take ?

    What's even more chilling about that incident, is that the guy running the test was using an unapproved, homemade pressure gauge that had never been calibrated and had the capability of going multiple times around the scale with no indication of being past a single revolution. If I remember...
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    Presurization - Whats it take ?

    We run a pressurized cockpit on our fighters. Takes quite a bit of structural engineering on the design side as well as understanding the principles of pressure vessel design. Everything that penetrates the vessel comes into play with the design, down to the control cables that penetrate the...
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    Presurization - Whats it take ?

    Cessna P210 empty weight is between 400 and 500 lbs more than a T210. Most of that is from the pressurization system.
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    Workbench question

    EAA Chapter 1000 tables are good.
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    Drill bit sharpener or new bits?

    A Black Diamond sharpener only goes down to a #70, and it’s a $9000 unit. A Micra10 will do it, but I couldn’t find a price on one, even a used one. I suspect that for doing microbits, you are going to be close to a Black Diamond grinder price for a used one. You couple probably buy a new...
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    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...
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    Bolt holes, burr and fatigue life effects

    Orange wire or yellow wire, depending on the company is flight test instrumentation wiring....
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    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.
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    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!
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    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...
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    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...
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    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.
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