old man emu

what is the strain can be put on a RAA aircraft ropes.

Let's see what the question is about.

It is not about what is the wind velocity that will lift an aircraft against its tie-downs. That's easy. It's the wind velocity that is equal to the stall speed of the aircraft in level flight. (Assuming the aircraft is tied down on level ground with the wind coming from head on. For those with slide rules, you can calculate the head-on wind vector of a wind blowing at an angle to the centre of gravity on the longitudinal axis of the aircraft.

The question is: What strain can be put on the ropes? The assumption is that the question relates to the amount of strain the ropes can accept before one of three things happens:

1. The ropes break
   
2. The ropes pull out the stakes in the ground
   
3. The aircraft suffers damage at the tie-down hooks.
   

The answer to No. 1 depends on the ability of the ropes to resist the Stress of the lift force acting along the rope to the tie-down. If the Lift force exceed the Stress capability of the rope, the rope will break.

The answer to No 2. depends on the contact area of the stake with the ground, and the density of the ground. In some cases, the weight of additional material attached to the stake (concrete block).

The answer to No. 3 depends on the the design of the tie-down points and where they are on the located. If the tie-down points were located at the wingtips, then we would expect bending of the wing to occur when the G rating of the spar was passed. In other places (wing strut attach points, or undercarriage axle attach points the lift force would be much greater.

The argument is probably more theoretical than practical for those who do not live in hurricane or tornado areas. Consider that the fastest wind speed not related to tornadoes ever recorded was during the passage of Tropical Cyclone Olivia on 10 April 1996: an automatic weather station on Barrow Island, Australia, registered a maximum wind gust of 220.2 kn. During the cyclone, several extreme gusts of greater than 161 kn were recorded, with a maximum 5-minute mean speed of 95 kn. That means that a tied-down aircraft is not likely to have to deal with winds much greater than its normal cruise speed, or even grater than its Vne. And we all know that the Vne has a fudge factor adjustment.

Log tables - yes; Trig tables - yes, but never really got into slide rules until I started using a whizz wheel. Wasn't the slide rule an essential tool in designing the first electronic computer?

I still use Tables of Imperial to Metric measurement regularly in the workshop, although now I have this Convert for Windows for the office.

Red wine with chicken??!!! It must be the Sixties.

Welcome to the club, Skellywelly. We welcome people from all over the world. Probably the closest member to you lives in Cannock and operates out of Otherton, near the M6 at Penkridge.

Aircraft are aircraft and there is a wealth of knowledge and experience here to assist you.

You'll do a lot more than $260's worth of damage if the fuel pump gives up the ghost at 3500'.

Fuel pumps in cars, at least, are pretty reliable things. How many have you had to change in the cars you have owned over your life? I think that the biggest problem for aircraft fuel pumps is the fact that they are not used enough, and this leads to deterioration of the diaphragm. Compare the number of hours per year your aircraft's fuel pump works with the number of hours your car's one does.

R.Sole, NSW Public Servant, wouldn't let Mum, Bub and Dad drive through NSW by the most direct route. Told her to stay in Victoria.

An 11 hour trip to cross NSW along the Newell, with a stop at Dubbo after 6 hours.

I've had my Jeppesen whizz wheel for over 45 years. Its batteries never go flat, and its screen doesn't crack if I drop it. It has a carbon track memory with a thumb-driven data eraser. The circular arrangement of its logarithmic scales enable easy input of variable data, resulting in micro-second computation times to a degree of accuracy that ensures accurate navigation and aircraft performance management.

I'm a bloke and single. Why would I read New Idea?

If you have to ask, you really don't look into the New Idea. Your first post was like a front cover come-on typical of that publication. The New Idea seems to have taken the publication of the results of a round of Chinese Whispers to new heights. Mind you, the puzzle pages are good for a mental workout.

Am I correct in thinking that Mark is an Angel Flight pilot?

avdata (a private company) now have everyones name, rego and address....... without their express permission.

I was wondering if the passing on of that information could be an offence against the Privacy Act, so I had a look into it. I don't think RAA broke the law, unless, as a "small business", its annual turnover is more than $3 million. It all has to do with the protection of "personal information", which is explained here:

What is personal information?.

A major part of that protection process is the consent of the person to the use of personal data. An organisation doesn’t need your express consent to handle your non-sensitive personal information; but they need to reasonably believe that they have your implied consent. It’s not sufficient for an organisation or agency simply to tell you of their collection, use or disclosure of your personal information. Unless they presented you with an opt-out option they cannot assume your implied consent.

https://www.oaic.gov.au/privacy/your-privacy-rights/your-personal-information/consent-to-the-handling-of-personal-information/

Did RAA provide an opt-out option when you provided it with your personal information?

Been reading New Idea?

A huge thank you Red from every site user

I am writing a one page history of each 19th century gold mine in my list.

See, Ian, there is a lot of scope either here or in the other site for non-aviation categories

Jabiru drones could carry a 300kg bomb each,

Why go to the trouble of fitting out a Jab for drone work. All we have to do is dust off the plans for the Jindivik, GAF Jindivik - Wikipedia Replace any 20th Century radio control gear with 21st Century stuff and possibly look at weight reduction by using fibreglass or other composites in the construction. Originally the Jindivik had a MTOW of 1451 kg, so there should be some Jenny Craig results possible. Since the idea is to use it mainly as a weapons delivery system, it's going to be a one-way flight, so it doesn't need to be built to last for years. Also, modern turbo jet engines would have to be better than the Rolls-Royce Viper Mk.201 that powered the Jindivik.

But wouldn't you like to fly the Jindivik's sister, the Pika? RAAF Museum: Hangar 180: GAF Pika

Curse you, Red Baron!

Now I will definitely have to get stuck into my task of transcribing the data for Army Registration Numbers of WWll Indian and Harley-Davidson motorcycles into a spreadsheet database.

Just near the end of the video, you see Fairbairn carrying out an inspection of trainees - a formal occasion. Note that his right arm, showing a distinct bend, is in his coat pocket and his left hand shows the loss of the ring and little fingers. One wonders how he could control the engines of a Percival Q.6 (Petrel) with limited arm movement.

When calibrating an EFIS for magnetic readouts, you need to establish 'dip' for your location and it is done via some website or other,

Here it is:

http://www.geomag.bgs.ac.uk/data_service/models_compass/wmm_calc.html

Now there's a possible cause for a compass reading incorrectly. If you buy a compass fro one of the suppliers in the States, you have to make it clear to them that you want one set for southern dip.

https://www.skybrary.aero/index.php/Magnetic_Dip

Is the GPS derived compass in a smart phone correct? I think so.

Also, there's a thing called a Compass Deviation Card that you can fill in and paste beside your compass. If you copy this image, you can paste it in Word and make up a whole heap of them.

That's good that it's going into socialaustralia. I think it will be of great use there, catering to more generalised scope of interest. Car books, DIY books, novels and non-fiction. I wonder how long after it goes live some shining wit will post the Karma Sutra.

That looks like a good way to create entries, but the entries are basically sales blurbs. How an a discussion be carried out.

The same thing, elsewhere, would allow the movies to be dealt with.

Is it possible to have Plain English weather converter for New Zealand?

If New Zealanders spoke Plain English, a special one wouldn't be needed.

You got it all wrong. Another Covid 19 death

Alf, please read post #3 above.

Hi Phil!

I was wondering if you were OK since you haven't been posting for a while. But don't worry, Jerry has been holding up the flag for you Poms.

a guy asks if I want to go up in an old bi-plane. So next thing I know I am in an open cockpit. There was something about chugging along nice and slow and just enjoying the scenery.

Hallelujah! The man has gotten over his NASCAR fetish and come into the Light.

Maybe you guys have heard of Will Power? I had some of that once, but like my get-up-an-go, it got up and went.

Don't forget that it's airspeed AND angle of attack that create lift.

MODERATOR'S COMMENT.

There's a time and place for being witty, but perhaps not when reviewing a fatal incident. Please try to show a bit of decorum.