Marty_d

Try about 12 years to get where I am now... mind you I did have to fabricate everything myself. I was hoping to finish by the time I hit 50 which leaves me about 7 months - don't think I'm going to make it!

New diagram:

Sorry, should have mentioned - tank vents are in the fuel caps, furthest point outboard on the top of the tanks.

Hi Nev, As Bob says the T would be on the fuel return line. Theoretically if the fuel return line were full of fuel (not sure how likely that is with 1/4" line) then it could spill down the T'd line into the header tank - so that doesn't matter either. I guess the main thing is that if any air does get into the header tank, it finds the highest point and goes back into the top of the tank. This is just to keep the low fuel sensor off so I don't have unnecessary involuntary clenching. A diagram of what I'm thinking is:

I haven't quite got there yet, but I look forward to the responses! Have you checked out Mark Kyle's thread about his Sav rebuild - not too long ago he was describing the painting process. He got a load of white from one of the airlines I think.

So it seems like I should stick with 3/8" from the tanks onward. On the R/H tank I have a 1/4" fitting at the top for fuel return. According to the Rotax Heavy Maintenance manual, this comes from a 5-way fitting bolted to the compensation tube running between the carbs. 1) Fuel in from the mechanical fuel pump 2) and 3) Fuel out to the carbs 4) smaller fuel out to the fuel pressure gauge 5) smaller fuel out (return) to the R/H tank. That's fine. But the other thing I have on the Savannah header tank is a breather tube that's meant to go to the top of a tank (usually the L/H one I believe). My tanks are hard to get to - unlike the Savannah, the 701 doesn't have an access panel below the tanks. So if I want to get a tank out to modify it, I either have to drill out a fairly large area of wing skin rivets or cut the aluminium away under the tank and replace with a panel (either riveted or screwed) like the Savannah. So I'm trying hard NOT to modify my tanks in any way! Question 1: Could I put a T fitting on the 1/4" hose that comes from the TOP of the R/H tank (this is the fuel return) and run the header tank breather to that? If the T was very close to the tank would that work? Question 2: What diameter hose/pipe do people use for the line to the fuel pressure gauge, and also the fuel return? I'm thinking 1/4" for the return because that's what I have at the tank end - is that standard? Below is a photo of the R/H wing root with top root skin removed, showing the return line at the top left side and the fuel main line at the bottom right side. So question 1 refers to plumbing a T into that top left return line, right before that rib beside the tank, then running that down to the header tank as a breather line. Thanks! Cheers, Marty

Hi all, Trying to work out whether I can get away with 1/4" ID aluminium tube from the wing tanks down to a Y or T junction before the Savannah header tank. From there the single hose can be 3/8" which I think is the barb size at the top of the header. (I can also use 3/8" from the header to the engine). Reason being, I have 4 panel-mount quick release fittings from Aircraft Spruce which I want to use in the wing roots, in case this becomes a trailerable aircraft. These are 1/4". Back of the envelope tells me the area of a 1/4" cross section would be 31.66 sq.mm, so 2 tanks = 63.33 sq.mm. Compared to this a single 3/8" area would be 71.2 sq.mm However I have had advice that it's all about ensuring sufficient fuel flow, based on a maximum of 27LPH for the 912ULS. How do you calculate this? There are online flow calculators but one of the variables is pressure (bar). Is there a set variable for this based on the mechanical fuel pump at the front of the engine? Thanks, Marty

My 172 instructor told me not to worry about sheep in a forced landing situation - he said they'd either get out of the way or slow me down!

I learnt to hang glide in Western Vic - think it was near Beaufort, about 26 years ago. My instructor was a real character. He'd been in some competitions in Europe and told us about landing in a field in the Netherlands, which was filled with tall dark green plants. It was a fortunate choice, as he found out later - there were quite a few buds from these plants in the back of his harness bag where it was unzipped for landing!

Thanks Bob, that's excellent. Gives me the position nicely. Given the 701 doesn't have that nice rounded corner on the fuse sides, I may be able to get it even closer to the side so that port connector isn't so close to the flaperon mixer. So - if one of your big barbs is the breather, where does it run to? I'm assuming somewhere high!

Received the header tank (2nd hand) from Aerokits today. All looks good and has complete wiring to the test button - although not to light, so will have to figure that out. I think the harness that I have on already has the test button and connectors so will probably use that one. Now obviously the tank sits behind passenger and drain cock protrudes below the aircraft (and I'd always thought of it as a "her" before now!) and looks like two small bolts hold it in position. Questions for the Sav owners: 1. Is there any reinforcement below the tank or does it sit on the bottom skin? 2. Is it fairly well centred behind the passengers side? Or over to the fuse side and just enough room to clear the rudder cable? 3. How close to the main gear channel does the front of it sit? 4. On top, there's 2 large barb fittings (from the tanks) and a smaller barb which I assume is for a breather. Where does that line go? Any photos of your installs would be much appreciated! Thanks. Cheers, Marty

Question re: hangar doors. Wouldn't it make sense to use a hell of a lot of hinges and build extremely big concertina doors? Tall but narrow, running in tracks top and bottom. Thinking maybe 1 - 1.5m wide, hinged to the next one. Shouldn't be an issue with wind, pretty strong because of the track connections every panel, allows pretty much full width opening apart from the combined thickness of the panels, can be built from whatever you can get cheaply. Downsides would be hard to seal especially top and bottom (maybe a rubber flap fixed to the frame), and the cost of the track hardware - although you could design/manufacture that yourself.

You had to move the WING? That seems like a big step for a 2.4kg reduction in weight (presumably at the firewall if you're moving the wing aft).

Bit late for that! Hopefully I don't have to put a lot of weight down the tail end. I can move the battery if necessary but I'd rather not.

My fault for not fact checking - I had no idea what Brazil's population was but the maths stuck out like dogs balls. So, my apologies @bull, it's actually 0.278% - NOT 2.9%, but equally not 0.02% as you stated. The fact does remain that comparing it to other causes of death are not really helpful, as those other causes were the same before Covid and deaths from Covid are an additional factor. Far from "being fearful" as one punter puts it (hint: he seems to bounce between "funny" and "caution" responses, in equally inappropriate ways) - it's common sense to use all reasonable means of minimizing the death rate.

Check your maths, 20 mil population with 586,590 deaths is 2.9 percent not 0.02.

They're devils, not tigers - like Elvis the tiger has been extinct for a while.

Hi Dalmo, What plane is your kit? The Aircraft: in your avatar says Jabiru 230D - if that's what you're talking about then some of the folks who have Jabs could probably give you some info. Your first port of call though would be the factory that produced the kit. Many types have semi-official builder sites that have a lot of info - for example I often look at Zenith.aero because there's bound to be a user who's posted useful photos of whatever I'm working on. Good luck with your search.

Agree 100% there are industries where vaccination should be mandatory. If you're medical staff in a hospital or work in an age care facility you can't be moved to an area with reduced contact. If there is some medical reason the person cannot have the jab then the employer will have to deal with that another way - maybe regular testing etc - but if it's just a choice, then perhaps they should be looking at a different career.

Wrong question, really. If you're going to compare the two, think of it this way: If there was a slight change you could make to your flying, either a piece of safety equipment or a change to procedure, that would make you a little bit safer and also make aircraft around you safer, and it was totally free, would you use it? Because that's what the vaccine does. Saying the vaccine does not prevent you from getting Covid and passing it on to someone who is 70 is not entirely correct. The vaccine both reduces your chances of getting it, cuts down the viral load so your chances of passing it on are much reduced, and gives you a much better chance of not getting seriously sick. Did I mention it's free? So not really sure what your problem is with it.

Must have bloody strong spars to withstand those G forces. Lot of pressure with long glider wings.

Good picture Peter. We had a chopper doing powerline inspections around here a couple months back, despite him being about 100ft from me the pictures were crap!

Back to the point of the cops using the check-in app - (sorry I came to the party late) - there's some commentary above along the lines of "anything that catches criminals is a good thing". I think that misses the point. The problem with the cops using checkin data is not the breach of privacy or anything else - it's that the system depends on people trusting it for them to use it. If you take away that trust by abusing it, then a percentage of the population will stop using the app (even pretend by waving their mobile at the signs, as someone else suggested happens sometimes) and then your whole track & trace system goes down the toilet and we lose one of our best weapons against covid.

Total thread drift - but what amuses me about catholic weddings is the need to get advice from a priest first. Naturally the best person to give advice on married life is someone who will stay single their whole life and is (supposedly) celibate...

I did wonder, but I guess some wedding cakes look like they needed engineer advice.