danny_galaga

1 hour ago, Thruster88 said:

Making the engine more beautiful on the outside will do nothing for reliability. Get some Alibright in the ignition system may reduce reliability. 

Totally agree. Leave it be I say.

1 hour ago, Moneybox said:

 

This is the kit I hope to get. I could probably save some money buying from the states but I've been ripped off by Americans more than any other race that I dealt with and I used to trade internationally. 

It's actually quite hard getting genuine Rotax stuff from overseas suppliers. They seem to be region -locked, like a 1990s computer game 😄

1 hour ago, Red said:

I agree that is best practice and already provided with the Carmo,  did you end up with the case grounded anyway just because its easier to mount to something metal thats probably grounded itself and adds some heatsinking?

I haven't looked at it closely but I seem to recall the mounts are stand off, which lets air circulate behind. My firewall is fibreglass, with aluminium covered fibreglass heat shielding, so maybe it's grounded on that but (again from memory) the regulator is potted in a generic heat sink So I don't know if there is even an electrical connection, in other words I have a feeling it's above ground.

2 hours ago, Blueadventures said:

 

Just asking if the green wire from the RecReg going to the battery negative; also has a connection to the airframe? Like in the schematic.

 

On my build I has three negative ground posts that all grounds connect to so I'm not relying on the airframe connection to the battery negative for grounding circuit.  Cheers.

No. I'm not even sure why they put that earth symbol there, other than to say if you've wired your aircraft with negative earth (that is, instead of having a negative wire going to devices, the battery negative connects to the metal airframe and your device gets its negative from the airframe, like a car does). In any case it's probably best to use wire for the negative of your regulator, not the airframe.

Yeah, we are saying the same thing in different ways. Electrically, saying "earth" on DC voltage electrics in cars, trucks etc implies a common "ground" connection, nowadays always negative via a metal chassis, body etc. as you know, that's what is happening in your car. Just saying "negative" doesn't automatically tell you how it's created. That's why I was trying to be really clear. Some cars up until the 1950's had positive ground! Pommy of course 😄

So with my auto electrical background, knowing how problematic earth return/ground/common is on things like trailers and boats, I fully understand and embrace "earth return" wiring in an aircraft. That is, wire carries the current for both positive and negative. No device on my aircraft is powered via current transmitted through the metal of the airframe.

1 hour ago, Blueadventures said:

And the negative green connects to airframe. As well as battery negative?  Agree heat sink / mount does not need to be grounded.

The only "earth" on my plane is the negative battery cable going to a bolt on the starter motor rear housing. Everything else is negative wired. The airframe almost certainly has negative potential because something will ground the engine to it somewhere along the way (for instance the throttle cable. Or maybe the Facet fuel pump) but it's not part of the "deliberate" electrical system.

55 minutes ago, skippydiesel said:

Nice clear schematics Danny - Although not shown, would still run a dedicated negative/earth return circuit connecting to the device body.

Although chassi/airframe returns are common, I don't like their  potential, over time, for a little bit of oxidisation /paint/dirt/movement to increase the return resistance, in some cases, to the point of nil continuity.

The cost & weight of dedicated return circuit (usually in parallel with the airframe) is negligible.

You're preaching to the converted. Earth return on everything on my build. My regulator is hooked up directly to the positive and negative of the battery (well from memory to the bus bar) and the heat sink itself doesn't require an earth from memory as you can see from the differences in the two regulator diagrams. 

It's pretty much ready to fly, the paperwork is taking forever. Here is what $900 odd dollars worth of weighing looks like 😄

27 minutes ago, skippydiesel said:

I ground my rectifier/regulator case by;

• Fixing it to the metal airframe
• Running a dedicated earth/ground wire, from one of the fixing screws, to a negative bus 

 

I strongly recomend the installation/use of a dedicated negative/earth return circuit for all 12 volt systems.

Agree. In this case we are talking about the CARR5115 regulator. 

4 hours ago, Red said:

Danny I just got a carmo reg/rec.....did you ground the case?, the accompanying drawing shows no ground connection to case which tbh would make things difficult mounting wise, I'll give carmo a call on monday but saw you mention them and thought worth an ask

You don't need to ground the case per se as there is a negative lead. I hadn't given that much thought as mine is in a new build so I wired it accordingly. Good question!

Its a friggin nuisance. Like I say, the same picture posted on FB will be the right way around. I've lost interest in figuring out why. I'm finding I'm losing interest in a lot of things nowadays, particularly modern things that should just work.

Aha. Just tried an experiment. I just did the slightest edit (cropped it a smidge) on the picture and saved it. Didn't rotate it. It now posts the right way around. Editing it seems to change some mysterious Android -y info that turns it around on this forum. 

I have a picture of my first CL model. Very grainy 110 film, taken by a 12 year old so not the best 😄

You'll need to look carefully, it's behind the cats 😄. I'm.sure I took a closeup too, will have to do some more digging.

I've decided when I build the K K Phantom, I'll paint it to resemble as much as I can my Aeroflyte Cherokee. I can do much better paint jobs nowadays, but it will be a homage to Dad and 12 yo me 😊 

Edit: I rotated the picture. Murphy's Law means I'll rotate it 3 ways before I get it right, so live with it 😁 

15 hours ago, spacesailor said:

Parramatta Radio Control Aircraft club Inc 

The site has map of the field .

spacesailor

 

 

I can't tell where their control line circles are.

Took a bit of doing but heres the satellite views of the brissie CL club.

Second pic shows the whole lease. That other part is what they sub lease to the dog club. The whole situation is a breath of fresh air from a council.

13 hours ago, spacesailor said:

A gram of mercury occupies how many millilitres. 

 " 0.074 millilitres "

spacesailor

Damn, that's nearly as dense as me 😄

Um, probably getting a bit off track there spaceman. But yes it's mostly glow engines, the occasional diesel and some guys are messing with electric.

The guys that got this club going some really good arrangements. The field is ex rubbish dump, so no building on it for the foreseeable future. It's also located in an industrial area so no problems with noise. It's also pretty close to Archerfield so no radio controlled models allowed. They have three circles, which is a pretty rare thing nowadays. They have such a large lease, they are subleasing the unused half to a dog club that does that 'chasing things on a wire and pulleys' thing. I call them control line dogs 😄

The dogs don't seem to mind the noise.

1 hour ago, onetrack said:

There's a big difference between grams and millilitres, you're comparing apples to oranges. Grams is weight measure, ml is volume measure.

You can have a vast difference in quantity for the same numerical amount, depending on the S.G. of the particular product.

Eg, a millilitre of mercury compared to a millilitre of air. And put another way, what volume does a gram of mercury occupy, compared to a gram of air.

That's quite neat 🙂. Mine just has green rectangles, but then again it's free software so I can't complain about that.

Interestingly, the don't seem to be doing combat. They do seem to be doing a club speed class. Every club does their own thing. The idea is everyone builds the same plane, engines are standard. The class they devised is right up my alley. They used a modified plan of the Keil Kraft Phantom, which was originally a trainer from the 1940's. And run relatively modern standard .15 sized engines instead of 1940's .10 sized. 

I still have my OS .15 that dad bought me for my 12th birthday. It came with an Aeroflyte Cherokee. Model is long gone of course, but this club class racer would be a lovely use of my old engine 😊

Photos at the bottom of this link are from one of the planes at the club. Actually the same guy that made that aerobatic model .

http://outerzone.co.uk/plan_details.asp?ID=1397

Australian design from 1967. Has a more modern Ukrainian engine in it. I think maybe a .60 

9 hours ago, kgwilson said:

Again depending on the Navigation software traff In Enroute FP only ADSB out enabled traffic less than 20NM horizontally and less than 1500 metres vertically will be displayed so you won't see all the RPT flying overhead at 35,000 feet.

 

That's one of the few positives of living near a flight path.I  see all the traffic coming in to brissie airport from my place. 

I'm not sure if I'm ever going to fly again so at least I can use this for plane spotting 🙂

Oh, it's  picking up flights now. But still gives me the same warning 🤔 

Thought I'd watch riverfire from home on my tablet, since who knows when I'll actually use this for navigating 😄

But it's been so long, I can't remember how to make it work. It used to be fairly automatic. Any ideas? Dunno if I'll get this sorted out in time. But theres always riverfire 2025...

2 hours ago, BrendAn said:

another good photo .aircraft tug still chained to the deck of a sunken aircraft carrier 5300 mts deep.

😲

Amazing it stayed in place. I'm guessing the carrier went straight down rather than sliding in 

Whats the launch speed of a Corsair? Maybe 200 km/h? Barrel rolling into the drink at 200 km/h. Dunno. You'd cross your fingers for him, but...

10 hours ago, BrendAn said:

another good photo. corsair wing lock failed when it took off

He probably died on impact 😔