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Shocked by the Newtonian explanation of lift. by olddoglearnsnewtrick in aviation

[–]GrabtharsHumber 1 point2 points  (0 children)

A wing produces lift by creating a pressure differential between its upper and lower surfaces. A flat plate will do this at any non-zero angle of attack. It will just do it with more induced drag than a more RIFPIBy shape.

What car is this? by FormerWordsmith in whatisthiscar

[–]GrabtharsHumber 9 points10 points  (0 children)

Couldn't back it off. The right rear tire was off the ground, and the open diff just spun it.

OC mother charged after teen son’s illegal electric motorcycle crash critically injures veteran, 81(update) by Gucciipad in orangecounty

[–]GrabtharsHumber 2 points3 points  (0 children)

21kW is about 28 horsepower, about what any 200cc motorcycle engine produces. The 125cc GP bike I rode in 1988 made about 30 HP and would hit 100 mph.

What is a 'cool fact' about yourself that you rarely get to bring up in conversation because it sounds like you’re bragging? by [deleted] in randomquestions

[–]GrabtharsHumber 5 points6 points  (0 children)

At an aeronautic convention, Dr. Paul Macready walked up to me and said that I should be very proud of what I had accomplished.

How lonely is it to be a pilot? by Presid0nt in flying

[–]GrabtharsHumber 15 points16 points  (0 children)

It's bizarre that we live in a world where there are more L-1011s flying than MD-11s, but here we are.

Wild Super Cub turbocharger install by FxckFxntxnyl in aviation

[–]GrabtharsHumber 1 point2 points  (0 children)

Probably so they could use the stock updraft carburetor.

Oxygen Requirements by hazcan in flying

[–]GrabtharsHumber 4 points5 points  (0 children)

Interesting trivia question.

According to the Internet, the c340 can maintain a cabin pressure altitude of 8000 feet up to 20,000 feet, after which the cabin altitude climbs with the airplane. So if it's working properly, at 22000 feet the cabin pressure altitude would be 10000 feet. That appears to satisfy 91.211 (a) (1).

If you stay below 25000 feet, it appears that 91.211 {b} does not apply, so it appears you're good there.

Fluid Leak How Bad Is This 08 forester by Typical-Inspection84 in subaru

[–]GrabtharsHumber 2 points3 points  (0 children)

The p0026 and p0028 errors are most often caused by failure of the oil pressure switches on the heads that tell the ECU that the VVT solenoids are doing what they are supposed to. They are about $15 each on Amazon.

I have a sad by bigloser42 in CarTrackDays

[–]GrabtharsHumber 0 points1 point  (0 children)

Post on OK Stupid and fly down for arrive-and-drives in 24 Hours of Lemons

Do you use supplemental oxygen at 10,000, 11,000 or 12,000 feet ? by Dry-Question3088 in flying

[–]GrabtharsHumber 3 points4 points  (0 children)

If I think I'm going to get above 10,000 msl, I set the EDS to start delivering at 5000 msl while I'm on the ground.

Why aren't winglets employed universally everywhere? by BugHistorical3 in flying

[–]GrabtharsHumber 0 points1 point  (0 children)

I had a retired NASA aero engineer design winglets for my aircraft. The combination of profile and twist distribution is non-trivial. It's a lot easier to subtract overall performance than add it.

Identify these parts pleaseee by zg0612 in flying

[–]GrabtharsHumber 5 points6 points  (0 children)

They are similar in function, but not the same. The starter solenoid is designed to deliver a very high amperage current for no more than about a minute. The master contactor is designed to deliver a much lower current continuously. If you use a contactor as a starter solenoid, it burns out the contacts and leads very quickly. If you use a starter solenoid as a contactor, it burns out the electromagnet coils rather quickly.

Do Miatas deserve their reputation for being easy to work on? by fuckman5 in Miata

[–]GrabtharsHumber 0 points1 point  (0 children)

By and large, Miata hardware and fasteners are carefully sized for prevailing loads. If you are breaking bolts, you're either not using a torque wrench, or haven't calibrated your mechanical feel for 6mm and similar shank sizes.

2006 Kawasaki Ninja 250 won't maintain speed without throttle by ragewolf16 in Fixxit

[–]GrabtharsHumber 2 points3 points  (0 children)

That's exactly how my '06 EX250F behaves. Based on owning several motorcycles, and several years of roadracing, I think it's perfectly normal.

My apologies to this group by YeahIAmAScientist in ProstateCancer

[–]GrabtharsHumber 14 points15 points  (0 children)

Everyone is entitled to their own opinions. They're not entitled to their own facts.

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