old man emu

Good thing he was wearing a cup[ATTACH=full]36177[/ATTACH]

OME

Using a .22 Magnum loaded to give a muzzle velocity of 610 m/s, we can calculate the Force applied to the target using the Law of Conservation of Momentum.

Bullet weight = 40 grains = 2.6 gm - 0.0026 kg (m1)

Muzzle velocity = 610 m/s (v1)

Target = 100 kg (m2)

Target initiral velocity = 0 m/s (v2)

m3.v3 = momentum of bullet after impact

m4.v4 = momentum of target after impact

m1.v1 + m2.v2 = m3.v3 + m4.v4

(0.0026)* 610) + (100 * 0) = (0.0026 * 0) + (100 * v4)

1.56 kg m/s + 0 = 0 + 100v4

(1.56 / 100) = v4

0.0156 m/s = v4

0.0156 m/s = 0.056 Kph

If we knew how long it took for the bullet to stop, we could calculate the deceleration (v1 - v3)/t and from that work out the force exerted on the target by the bullet, F = ma.

OME

Reminds me of that great piece of classical music - The William Tell Overkill. Hi Ho Silver. Away!

OME

I like to think that we are more civilised now than the Romans when it comes to the treatment of violence. However I think you hit the nail on the head by raising the image of a big hit on the racetrack. I suppose I should have qualified what I said in the first place to indicate that the crowd likes to see the machine destroyed. When there is a bit hit, the crowd is excited by what they can clearly see is happening to the vehicle, but after everything stops whizzing around, they remember that the vehicle has a person inside, and then they become concerned for the welfare of the person. That is an explanation for what TP wrote in his first paragraph.

I think it would be the outlawing of alcohol and the resultant drop in bad behaviour that would have convinced people that an outing to the speedway was a good one for the family. But I still think that a lot of the sons and dads would be hoping to see some collisions.

OME

Amazing, how many accidents have occurred at air shows,over the years!....A real tragedy. Frank.

It's an unfortunate reflection on the human psyche that humans like to see things meet a violent end. That's why the Romans enjoyed their gladiators; the medieval crowds flocked to jousts, and why we watch full-body contact football. It's why the media always includes "plummets" in its reports of airplane crashes.

Actually, for you word buffs, "plummet" derives from an naval word for a small lead (Pb) weight used for determining depth of water. Hence the phrase "to plumb the depths of [a subject]" Its verbal meaning relating to a fall only dates from the 1930's (the golden era of air shows), and actually refers to a high speed, vertical line descent. If you have the slightest knowledge of ballistic motion, you'll know that the trajectory of an object departing from horizontal motion is like the blue line in the diagram (don't worry about the real reason the graph was created, it's only for illustration.)

So airplanes never 'plummet' from the air unless their components lose all ability to create aerodynamic lift. How many times have you read WWll reports of the wings of bombers 'falling through the air like giant, fluttering leaves'?

Old Man Emu

There also doesn't appear to be any reason why RAA can't release the bare facts; clearing up the registration status(so that stops conjecture), and the basic status of aircraft, what it was doing etc.

OME

Gentlemen...I believe this post is done.....mods ?......

After the first couple of posts, (and with the exception of expressions of condolence) the thread has drowned in a sea of vitriol. Perhaps we should call a halt to the discussion until there are some confirmed facts.

My only thought is that a ballistic parachute might not deploy well enough to protect an airplane at low altitude in an EFOT.

OME

And what the hell is Grumpy gunna do about it?

OME

Pedantic Spelling Moment:

ADVICE: (Noun) Helpful information

ADVISE: (Verb) To give helpful information.

How to determine when to use the noun form or the verb form

The noun form contains "ice", which is the name of a thing.

The verb form contains "is", which is a verb. A verb is a word that describes an action.

And for the observant, "surprise" is comes as a surprise exception to the above.

OME

While I admit that John's posts, usually in this thread, can be somewhat tiresome due to their constant reliance on sexual innuendo, I cannot see why they should be pilloried as horribly racist when, as I have said before, there are plenty of posts here that rely on making fun of ethnic stereotypes. The ability of real Australians to take a joke is one of our great national characteristics, that goes way back in our history. Who hasn't chuckled at the humourous poems of Lawson and Patterson? Who hasn't laughed at a prat fall?

If I was to make any critical comment about the post, I'd ask John to give the jokes with sexual connotation a rest for a while and try to produce humour on other topics.

Old Man Emu

#624 is just the thing for the indecisive.

OME

Stop doing all your flying at the clubhouse bar. The beer taps absorb all the GPS signals.

OME

I wonder if the Stuka with the undercarriage spats might not have been an early prototype the factory was testing. The pilots and ground crew seem to be civilians.

I think that the folding wing version was being design for the Kreigsmarine, but they didn't have a flat-top.

OME

Phil,

There's anti-Christs and anti-heroes. You're anti-Viagra.

OME

This article provides a detailed explanation of how electrical circuits stop working. The knowledge it provides is an essential asset for the tinkerer.

http://www.lrfaq.org/series/Perils.smoke.html

OME

I think that the fact that the kids are in the shed with Dad is as important as their being 'hands on' in the work. I'd give each his own area of responsibility while they were pre-teeners. Find tasks around the shed that they can take charge of like keeping tools stored neatly, or making sure components and hardware are to hand. Of course they need to be shown how to waltz a broom. They should be taught how to identify each of your tools and how to size nuts, bolts and screws. Read to them each night from OME's Blue Bible.

The big "don't forget" is that you can't spend all you time on the plane. Make sure that you spend time with them doing their things, even if it means that you have to re-certify yourself on a skateboard. And be careful that they don't steer billycarts with the front axle. They'll never learn to do cross ind landings if they do.

OME

Although an Australian Court would not be bound to follow a legal decision made in another country, it would be considered unwise of a Court here not to acknowledge a foreign decision if the matter involved the application of law that were closely related in spirit and effect.

I'd say that if you operate from an airfield and have neighbours who whinge about the noise, bookmark the report of the Mile-Hi Skydiving case.

OME

Here's the link to the proposed amendment: www.casa.gov.au/ADFiles/equip/prop/PAD-PROP-001.pdf

Read Appendix 1 to see what's involved in a hub/blade inspection.

As the manufacturer of the prop, you have the one who sets the manufacturer's requirements for the prop, including TBO and balancing criteria. Therefore, you don't have to get anyone else involved unless you want to sub-contract any of the work.

OME

In the local New Jersey press:

http://www.mycentraljersey.com/story/news/local/hunterdon-county/2015/05/04/judge-slams-readingtons-solberg-airport-take-plan-abuse-power/26867311/

I'd love to read the judgement document.

OME

Dont even know if my Brolga has a TBO?

I've just typed in "brolga propeller" to Google and got this hit: http://www.competitionaircraft.com/Brolga.htm from which I got this:

Maintenance

The propeller has no definite life. An expectation of 2,000+ hours is not unrealistic, provided the proper inspection and maintenance schedule as follows is adhered to:

1. Every 20 hours, retorque blade bolts to 124-150 inch lb. And prop mounting bolts to appropriate value in table 2.

2. Every 200 hours, dismantle prop and inspect all parts for cracks and/or wear. Visually check the bolts and bolt holes and the "spline" area where the blades and pitch blocks are joined. No wear or elongation is allowed. Patches of surface corrosion on the blade bolts dictates replacement. Replace any defective parts. Inspect the blades for water ingestion or delamination.

3. Any prop strike is cause for a complete disassembly and inspection as described in #2 above. The presence of any stress fracture emanating from the bolt holes in the blades dictates blade replacement.

4. Every 1000 hours, replace all hardware.

No wonder CASA has to issue stringent ADs to get owners to look after the safety of their airplanes.

OME

No. Not all coming from overseas instances. There are plenty of unloved props in this girted land. The CASA AD/PROP/1 Amdt 2 currently in force specifically excludes RAA and sport Rotorcraft aircraft. Amendment 3 "applies to all propellers".

Variable pitch props each have a log book, so keeping the maintenance up to date is easy. Fixed Pitch Props (wood, composite or metal) don't have a log book, so their maintenance is not so rigidly controlled. Wooden props don't have a TBO, however they are covered under AWB 61-007, http://www.casa.gov.au/wcmswr/_assets/main/airworth/awb/61/007.pdf

OME

Clue? There's an app for that : http://www.helloclue.com/

OME

Yes, it is another expenditure, but the issue draws attention to the need to regularly give the whirly bit a bit of a closer look.

Periods of operation or elapsed calendar time are calculated from the date of initial installation. There is a permitted storage period of up to 2 years after manufacture, but the clock starts clicking at the end of two years of storage.

OME

That illustrates the wind conditions better than the BOM weather radar.

OME

Wife: "Honey, what are you doing?"

Husband reply No 1: "Nothin'."

Wife: "That would be right. You sit around all day doing bugger all, while I'm working my fingers to the bone. Hrumph!"

Wife: "Honey, what are you doing?"

Husband reply No 2: "I'm busy at the moment."

Wife: "That would be right. You've always got time to be messing aroung with that bloody plane, or being on your forums talking about planes, but as soon as I ask for the slightest bit of help, you're "busy. Hrumph!"

Husband: " What can I do for you?"

Wife: "Nothing. I'm too busy to explain to you what should be obvious to you."

Husband:

OME