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A hangar partner's '49 Bonanza blew its RH main gear strut cap off, making a big pimple in the top wing skin. Again it was the slight chamfer radius side that was out. I saw it happen. The environment around a crank damper pin is pretty severe. The exact shape of the snap ring groove is...

Park facing downwind too.

Our 172M burned out the flame tubes about every 400 hrs when it first ran on 80 octane way back then, and again when it ran for about 1400 hrs more on MoGas. Our mechanics would only allow the flame tubes to be come so warped on annual. The purpose of fuel is to provide heat. There is no...

Automotive crankshafts are cast out of nodular iron because of its superior self damping properties. Years ago (>50) they were simpler forgings, like aircraft crankshafts are now, because of the better physical properties although self-damping isn't a superior property of forgings. Automotive...

From discussions w a McCauley engr - A prop at takeoff is 3/32" to 1/8" inch bigger in diameter. It is a non-redundant fatigue-loaded component that can down an airplane if it fails.

I believe aircraft engine crankshafts are forged from SAE4340, which through-hardened and is about as tough as any steel alloy can be found. The fatigue properties are further enhanced by nitriding, which puts the outer fibers in compression.

I'll never forget his article describing his apprehensions on the new first Braniff 747 flight takeoff from DFW to HON with full revenue load. The combined flight crew 747 experience was well under 10 hrs TT. Still brings tears to my eyes.....

Occasionally wash and dry any driver tips in lacquer thinner or similar solvent to remove any traces of lubrication or anti-seize.

I would expect that someone nearby on the ground could hear a strange cackle in your exhaust note. There's obviously been a lot of fire coming out of that crack.

Better be an extra-good loan rate - or a bank loan officer might be in trouble from screwing up a sizeable bank profit opportunity.

Our 172M used 6.7 GPH (Tachometer hrs). He must have been in a hurry.

The obvious solution to this conundrum is there should be mandatory yearly pressure testing of all aircraft tankso_O

Use old CD disks & hang from a string. Not verified to work though....

Some versions may, but it is not obvious that they all do. Earlier Battery Tender Jrs, while excellent battery maintainers for example, don't.

I have had very good luck restoring a sulfated 12V lead acid motorcycle battery using a pulse de-sulfator. Years back there was one sold by EAA Ch 79 for less than $25. It was probably just a chapter fund raiser. It was simply a kit of components with a small circuit board that when connected...

You might be able to find a bad connection by feeling each potential one for heat with your fingers immediately after cranking, but be prepared for the guilty one being very hot:eek:.

That's an unusually big door. I'm convinced there's a lot of shade tree engineering that goes into many of these systems.

Unless there's a spacer that has been completely omitted from the OP pictures, that would place unwanted heavy compression loads between the mounting tangs of the alternator.

I had a kit intercom in our 172M from Jim Wier of RST Electronics. The advantage of kit stuff is that you end up with a schematic. I added a small zener diode to the RST package to get 9 V to power the HI headset from there even though HI tech later told me that wouldn't work. I couldn't...

I have also had impressive reduction with the Headsets-Inc kit - installed in my David Clark H10-40 about 25 years ago. Being an engineer, and comparing an analog rejection system, it would seem like they would be better rejecting random vibration (especially at frequencies below say 200 Hz) vs...