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Combined with a weight(mass), it becomes a ‘disconnect while crashing’ safety device…

It’s Ben Franklin’s fault. He had a 50/50 chance of getting it right…and…. Pos to neg is “conventional current flow” and generally in mil standard documentation, is portrayed as flowing from top of the sheet to bottom. (and signal flows left to right)

By my experiments, the bottom vents reduce CHT by 5 deg F each.

Safety on take off: extended flap increases the effective twist of the wing, insuring that a stall will tend to be confined to the inner region of the wing, and, perhaps, increase tail buffeting. I always felt like I had more roll control, also.

Attaboy Bill, I retired 22 years ago and still wonder where it all went. When I was working, I was always tired. Now I’m re-tired……

M Thats a lot of work for no result. Did you measure anything else besides CHT before the build? At this point I would say measure the hot side pressure compared to ambient. Should be zero. The big effect of the box is to lower hot side pressure, not just CHT changes....

1. Front ramps...20F, if you drill 12 1/4 inch holes in them, you will not raise front temps and still drop rear temps. 2. box around front of engine.....27F 3. Lip on lower cowl exit...10F Measure pressure on hot side of cowl at 100 mph indicated, should be zero(compared to ambient) cold side...

The ten BILLION dollar dice toss.....it can still come up Snake Eyes. Once the shades are configured, it will stand a better chance.

9/16 grip bolt with no washer fits perfect....

Thanks again to tempdoug for sending me the service bulletin that makes clear the strut bolt configuration! http://www.shortwingpipers.org/photopost/data/509/piper_sb1172a.pdf too impatient to be a craftsman...

Yikes! The old bolts/ nuts had washers...so, I thought it was standard practice to use a washer under every nut. Are they just for spacing, and not to isolate the nut from torsional forces?

I expect that if they decided to use castellated nuts on the strut fork bottom ends, they had a good reason. A more certain containment of the nut, for example. Apparently the old bolts were a NAS1103 series, which is obsolete... replaced by NAS 6203 ...?

Recently I found myself reattaching my wings, (long story) and my IA sent away to Univair for replacement bolts. When using the new 3/8 bolts on the strut forks, I discovered that the short castellated nut could not be tightened enough to pass through the proper sized cotter pin unless really...

Yep, but that introduces fit problems.... Actually, tensile/ yield point depends on cross sectional area of the steel itself, so it can go either way between diameter or wall thickness. Bending or compression strength improves more with diameter than wall thickness.

Simplicate and add lightness...Geoffrey DeHaviland Although, by starting out too heavy, you could probably avoid a weight spiral, and maybe even run one negative...8) Although, if I was wanting to increase tubing thickness, it would be the lower longerons from the firewall to the baggage...

I am assuming you mean “pre heating” when you say “heat treating”....??

Back in the day, (the 1970’s)(sheesh...) when I started teaching myself how to weld airframes, TIG was illegal to use on airframes, (or so I thought, anyway...I’ve been unable to locate any printed evidence of this since) because of microcracks which formed along the edge of the heat affected...

My understanding was that the ride was primarily intended to be a check on the pilots instruction/ instructors....

15 watts maximum output power......

There’s one for a PA-12, also..... http://www.fadodge.com/pa-18-lift-strut-reinforcment-bracket/