What is it?

I'm having difficulty looking at the OP's pictures in the opening post, but I did get a clear view of them for a moment...and reluctant as I am to quibble, that ruler is 20cm, not 30.
 
I'm having difficulty looking at the OP's pictures in the opening post, but I did get a clear view of them for a moment...and reluctant as I am to quibble, that ruler is 20cm, not 30.

Absolutely correct (now I've looked at it properly). Serves me right for not looking closely and seeing that one of the children had cut it in half and cello-taped it back together without the middle bit !!
 
Rascals.

I had one of those big Toblerone bars one Christmas...SWMBO's nephew did something similar - discreetly removing chunks from the middle, leaving the ends apparently untouched.
 
If there is no undue slack in the pivots or backlash in the gears, then a careful strip down, greasing and reassembly is all it needs. I had an old folder which could jump a cog, yet worked just fine so long as the throttle was opened sensibly (not full ahead to full astern), keeping the pressures on the blades similar.

Rob.
 
If there is no undue slack in the pivots or backlash in the gears, then a careful strip down, greasing and reassembly is all it needs. I had an old folder which could jump a cog, yet worked just fine so long as the throttle was opened sensibly (not full ahead to full astern), keeping the pressures on the b

Rob.
I
have come across some debate about using grease or not - to do with how it might attract grit/sand and thereby increase wear.
Thoughts-....

Oh and by the way don't all rulers exaggerate in any case:-)
 
I guess it's six of one and half a dozen of the other. If the space is taken up by grease, then it will lessen the effects of any grit... In coloured water, full of sediment, I would expect grit to be washed into things if they are not greased. Leave it long enough and it will get in (Sod's Law), but regular cleaning and greasing might prevent it - who knows? I'd grease the blade pivots. Wouldn't grease the gears though, as that will hold grit and sand, being open.

Rob.
 
Oh and by the way, don't all rulers exaggerate...

No, their secretaries of state do it for them.

Why is it that folding propellers are sometimes said to work better in reverse than ahead? (Or is it that they're just better at reversing than non-folding props?) :confused:
 
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