Any question answered...

It's not quite that simple. The printers will actually arrange the pages to print so they can be bound into a book (imposition). So if there was a bleed, it wouldn't be from a left-hand page to its following right-hand page, but might be from e.g. page 4 to 13.

The 'gap' between bound pages (which is hidden in the binding, or is cut off in perfect binding) is a 'gutter' - although that has more than one meaning. You should generally bleed an image into the gutter to prevent white space at the spine in the finished book. Printers should prevent this from actually bleeding to another page as part of pre-press.

Check with your printers though....

So what's really confusing me, is that when it goes into the preview on the printers' website, it looks like this:

The left page with a strip of the right, and vice versa. They'll both be lost in the gutter it looks like, so I'm not that arsed tbh. It's a mystery to me.

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Bear in mind the green is (presumably) the trim mark, so the area outside that would be removed

I am extremely rusty here, but I think you should probably read that as confirmation that even in a worst-case scenario, the image on the left-hand page won't be visible at all on the left edge of the right-hand page.

One factor that comes into play is that the effective gutter in a bound book varies a bit between different pages, aside from normal variance in trimming. Depending on where the page is in each 'booklet' of maybe 16pp, which is a folded and cut single print sheet, the spine will open up a little more or less. But the printer should look after all that, and should alert you if anything in your artwork might cause problems.

I can find various figures, calculations and discussion on what’s worse for carbon emissions - driving or flying. They’re all based around commercial passenger jets though. What is the comparison between a car and a 2-seater light aircraft?

What is the comparison between a car and a 2-seater light aircraft?

The archetypal 2-seater would be the Cessna 150, which will apparently go 480 statute miles on the usable 18.7 imperial gallon fuel capacity. That's 25mpg, which is poor for a person who's trying to be green but better than a lot of sociopaths will be achieving in their completely unnecessary 300HP+ SUVs

What if you’re just going to the shops? Serious though, I assume taking off will use more fuel than cruising, so when does it become less efficient?

Cheers, that’s actually better than I assumed it would be. Rich uncle has a plane but likes to think of himself as very eco-aware etc. His car is obviously a Tesla, so he presumably feels one balances out the other 🤷‍♂️

Trying my memory here, but I think for short haul flights, approximately 10% of the fuel consumption for the journey is in take off. So it’s quite a lot.

actually better than I assumed it would be

There's a lot of potential for it to be better yet. Most very small light aircraft suffer from engines whose basic design dates back to the 1930s, and they weren't even cutting edge then. Specific fuel consumption suffers from large parasitic losses and poor thermodynamic performance as you would expect from two-valve air cooled petrol engines with no exhaust energy recovery. Modern automotive turbo diesels of comparable power use about a third less fuel. Also, many of the aerodynamic and structural designs are quite primitive, resulting in high drag and high mass. Applying the full suite of modern technology (refined aero, lightweight composite structure, turbo-diesel power) would easily yield 60mpg for a two seat aircraft.

I have 8 PDF zines that I want to assemble into one booklet and print and bind. Is there decent free software for doing a layout where originally they were designed around half an A4 page?

Thanks, I figured as much.

decent free software for doing [imposition]

pdftops and psutils along these lines

I’m switching out some old post/IS mount forks

My new forks are flat mount

I have a hope Rx4 post mount caliper and the appropriate adapter

I also have a sram force flat mount caliper

Which should I use? I prefer the Hope as I have a sram flat mount as the back brake, and I think the Hope has more stopping power, but is the adapter a compromise I don’t need?

A compromise in looks you mean? I’d just go for the better brake / whichever one I liked more.

More wondering about the integrity of an adapter which adds another link in the chain as it were

Another point of failure

I'd be surprised if a fully functioning RX4 had more usable power than a fully functioning Force calliper. It might look better, but then it's on an adapter, so it won't.

The flat mount caliper will use an adaptor on the forks anyway if it's a conventional flat mount fork where the mounting bolts go in the back of the fork leg.

Thanks I’m definitely in the function over form camp. Those bike porn nonces freak me out.

From this information is it possible to work out the inside lengths and angles of the main quadrilateral of this frame?

Reach 446
Stack 632
Top Tube (effective) 625
Seat Tube C-T 457.2
Head Angle 66
Seat Angle 72
Head Tube 150
Chainstay 445
BB Drop 60
BB Type 73
Fork Rake / Offset 80
Fork Length (A2C) 455
Seatpost Diameter 30.9
Headset EC34
Seat Clamp 33

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I can ask on the Stooge owners group if you just want the internal frame dimensions?

yes please - it's to make a template for a frame bag. I made one last year which worked well enough, but I'm keen to use actual measurements this time.

is it possible

No, because you haven't specified the tube diameters or their intersection coordinates. For example, although you know from the specified dimension the exact location of the head tube axis, the intersection with the down tube axis is at some arbitrary point between the two ends.

Have all the good usernames on all the main services already been taken? A former colleague just gave me their private email address. I thought they had a relatively unique name. It turns out it appears not so. They have name.surname12345@emailprovider.com which led me to thinking, what happens to everybody who didn't get their username for one of the main online services in the initial rush? Is everybody in the future destined to have john.smith45453323@emailprovider.com?

yes.