Old Koreelah

12 hours ago, Geoff_H said:

...an experimental made of Kevlar also spun into the ground.  The pilot got out and walked away.  The Kevlar all stretched and destroyed but the energy was absorbed by the Kevlar.  When I trimmed Kevlar on a layup the Stanley knife had chips in the blade from cutting it.  Very tough stuff that.

Kevlar laminates are great at absorbing impact and then returning to the original shape, but It’s mongrel stuff to work with; you can’t tell by looking whether the layup is saturated with resin. 

It’s almost impossible to cut the raw fabric. Decades ago George from FGI told me the trick they learned when cutting the sails for Australia II: buy boxes of cheap scissors, cut a meter or so until the blade is blunt then get a new one.

I discovered another trick: extend your layup over a temporary boundary and when it’s hardened, cut it with an angle grinder.

Your RAA membership carries the public liability insurance.

3 minutes ago, Blueadventures said:

Not really a new model just a wing design and testing. Should result in more sales.  When I see Dan in Mackay I’ll politely hit him up. Their aero engineers need a challenge i’d expect otherwise life will be boring:) cheers.

It would be more of a challenge than just a new wing, which alone would be a major job (I’d be hanging slats on the front edge)

Doing STOL stuff would require far more elevator range than the standard Jabiru design.

Then there is the testing regime to match the standards of their current models. Expensive.

Perhaps our best hope is for someone to develop a home-built modification kit.

1 hour ago, Geoff_H said:

I think that I would rather have my cabin remain enclosed.  It broke at the highest loaded parts, the side window struts.  I am glad all survived.  

Having the cabin remain intact would be ideal, but having a structure absorb a large part of the impact is probably more important. Other Jabiru crashes have also resulted in the firewall being ripped out- allowing the occupants to clamber out without serious injuries.

2 hours ago, Blueadventures said:

Absolutely agree, proven performance. Jabiru is a winner hands down every time. I recon they should offer a closer to stol performance wing in their range.

Too plurry right, Bluey!

I’d be in the market for a STOL Jabiru, but I can understand the factory having no interest in developing a totally new model.

The Jabiru airframe seems to tick most of the safety boxes; it has an exceptional record of aircrew survivability.

Heavy engine and its mounting frame in front, fiberglass from there back, with a big strong wing structure around the cabin.
Fiberglass may not be as light and strong as carbon, but is better at absorbing impacts progressively.

5 hours ago, facthunter said:

...The taste of the grape is in the wine and you won't make good wine from poor quality or contaminated grapes...

I worked on the 1975 harvest which suffered a severe beetle infestation which spraying couldn’t fix.

I delivered tonnes of grapes heavy with them directly into the crusher. That vintage won several awards.   

4 hours ago, waraton said:

Just got home from a river trip along the the darling river in NSW from Menindee to Wentworth then along the Murray to Renmark and Loxton. South West NSW is still dry as bone which is hard to imagine given the drenching other areas have had. Few pics of some river towns along the way. Weather was about as good as it gets...

 

All this long green grass, soggy ground and low cloud puts a dampener on flying.

Good seasons are great for farmers and lots of others, but droughts are better for pilots. 

16 minutes ago, spacesailor said:

MAYBE tomorrow! .

It,s our 59th wedding anniversary.

I,ll take the missus out for Chinese.

spacesailor

59 years?

Spacey your’e a stayer!

45 minutes ago, spacesailor said:

I bought a $ 8 bottle of wine, and now it is up to $80 at auction.

Should  l drink it ?.

OR

Hide it away for MY  wake.

spacesailor

Depends on whether I’m invited to your funeral...

59 minutes ago, planedriver said:

For those among'st us that like flight simulators, be grateful of the progress that has been made in recent years.

After all, you could be trying to learn how to fly on learn on one of these.

I like it!

You can actually see the effects of your inputs.

Those of us who learned to drive on open-wheel tractors quickly realised you have to straighten up the front wheels after turning.

My grandies, learning in my car, took ages to master that simple concept.

Just had a look at the BOM chart and OzRunways. Tried to see a correlation between the weather and lots of aircraft (on OzR) currently in the air over SE Qld.

Then the penny dropped. That would be people heading home from the Clifton Fly-In, which I missed again this year.

An impressive machine. The driven wheel for ground movement is a good idea.

4 hours ago, skippydiesel said:

Hi OK -

 

The foam you used to fill  the buttock mold ??

No idea, Skip. I formed the base obituary fiberglass over the plaster cast of my buckside, then lined it with a layer of foam rubber.  

Quote

How durable is the foam in service ??

It’s still comfortable, but I have only actually sat on it for only about 250 hrs over decade or so.

I support your plan of getting it professionally upholstered; mine certainly has that “home-made” finish.

I made mine very comfortable by mounding it to my butte (sat in pile of gravel, lined it with glad wrap, poured in plaster to make cast of backside) then adding 20mm of foam.
I suspect some people concentrate on making their seat light and comfortable and forget about the secondary function: protecting your spine in a crash. Mine has a lumbar support and the whole thing sits on polystyrene blocks to absorb crash impact.

Some wrap-around rally car seats seem to give excellent protection, if they can be made light enough.

Gyros are starting to look more attractive.

2 hours ago, RFguy said:

... I wouldnt run PULP in my jabiru in summer without a fuel return  back to the tank or header tank from a fuel pump bleed...for fear of vapor lock concerns.

As one who is changing to MoGas, that made my think of ways we could cool the fuel line to the engine. Maybe a cool-air tube like the ones running to the coils and fuel pump?

5 hours ago, danny_galaga said:

CORR! I've always wanted to build a Bleriot or Bleriot-like replica. Their three cylinder radial would be just the thing ❤️

Danny that engine would probably make your replica heaps safer than the original; have a look at this historic photo of the intrepid man just before his historic crossing of the Channel. 

To me, that is a look of sheer terror.

2 hours ago, Bosi72 said:

Everything you know is wrong.

This guy explained everything...

 

 

He’s a lot like that devout Moslem who was lecturing the crowd about how the earth is flat, because it says that in the Koran...

...and they pray to the same god, sometimes in the same language.

An easily manipulated species.

4 hours ago, Mike Gearon said:

wife doing her first ever weld in pic. I was surprised as it was okay... 

Mike an intellectual type I once knew surprised me with his impressive welding skills. He said his mum had taught him.

1 hour ago, Kyle Communications said:

Until they get the battery technology far better you wont see them in aircraft....not only the length of time available in the air is the issue but then its charging. If you fly out west you just cant plug it into a tree...

Mark, you of little faith...

Some of our little aeroplanes are ideal for adapting to solar/battery power, especially “out west’ where grid power is thin on the ground.

With a high wing covered in super-efficiency panels, we’d no longer be looking for a shady hangar for our planes. Fly in early morning stillness and recharge the batteries while we avoid the mid-day bumps. A couple of extra fold-out panels to cover the cockpit might speed up the process.

4 hours ago, RFguy said:

OK, understood. I'll fly up there  and say hello when I get the 230 back together.. cheers

Glen you’d be made very welcome, as would any visitors. Just let me know when you’re coming and we’ll kill the fatted calf...chicken?

On 27/02/2021 at 12:43 PM, RFguy said:

...OldK- are you using the stock general airbox Bing  - Jab manifold heater setup ? 25C rise eh ?

Glen I have the standard under-sump intake manifold, but my own air cleaner setup: a large air box with Corolla filter diagonally across the middle, then a straight run thu firewall into carb.  Nice even EGTs.

Carb heat air comes from a sheet metal sleeve fitting close around the muffler. I’d get much hotter air further upstream on an exhaust pipe, but the necessary cuff would cause the pipe to run extra hot when carb heating isn’t required. Some of that extra heat would conduct back to the head...

12 hours ago, RFguy said:

Pretty much like mine. no/negligible  rpm drop with 1 mag  and no change with carb heat...

Mine too. I have a probe just upstream of the carby which shows a slow temp increase of about 25C, but have never detected any change in engine revs. It’s not easy to get enough hot air for a really effective carb heat setup; it’s supposed to raise intake temps by about 50C in a few seconds.