Raising / Lowering a 40' aluminum antenna tower

[sophiecentaur]

a Mac comes with a mast-raising pole as standard equipment.

I'm wondering where the OP's pulley is attached. Sky hooks would be ideal for sailing but you can find them on the sides of buildings - it's another world on land.

The original Westerly centaur had a massively over-specked mast and it was not intended for bridges or for towing (two massive iron keels) so the mast raising pole was not standard equipment, afaik).

I don't really understand that,

A worm drive is often very inefficient and will only work from worm to pinion. A great example where Velocity ratio is much higher than 1/mechanical advantage - People still insist on using the wrong one, even here on PF.

 

[sophiecentaur]

The hardest part is when the tower is on the ground, because the angle θ is the sharpest.

Lifting it off the ground manually and resting it on a prop (or another person) can take care of the worst case of theta is zero). They can also hold a rope to control rotation when near vertical.
Basically there's no substitute for a few spare muscular blokes for these events.

 

[DaveC426913]

I'm wondering where the OP's pulley is attached.

 

[sophiecentaur]

Sorry I missed that image. Another thing to reduce the extreme of tension the lifting from the ground would be to use a pole or A frame, starting at say 45 degrees elevation - like the boat mast lifting gear. It would make things much less dramatic and stressful on the pulley fixing.

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