wow - you are ` aiming high `
i looked at this and thought ` thats so freaking easy ` - but having read the eintire thread - i am struggling to avoid ` how i would do it ` crap
that might be out of the OPs league - and suggest SENSIBLE plans
now 2 ` solutions ` spring to mind
1 - build or have built for you a single ` lattice ` mast in 3 to 5 sections
a micro vesion of this design :
with 2 banks of 3 guy wires , the main drawback is that this design ` swallows steel ` - and needs to be proffesionally fabricated and errected by
crane - as it will warp if you try to lift it from flat
it will look cool - and do the job - but the budget might go out of hand
2 - the simple solution - a tripod design
the advantages are - ` relativly easy ` self build - and POSSIBLY self errection
the disavantages - a massive ` footprint ` and relativly unsightly
but here goes with the basic outline
construction is of fairly cheep 50mm scaffold pole - joined by internal welded ferrules
step one - get everything you need :
basaically - 18 * 6 m scaffold poles [ for the tripod ] another 10 for ` other uses ` various brackets , strengthening fillets and other misceleny ,
enough concrete to make 3 ` base pads ` a ` yoke ` to top the tripod and a platform for your ` payload ` , a lightening conductor ,
step 2 ground work - you will need your 3 base pads to be rock solid - so you will need to dig a trench / hole - fill it with concrete - and set your
base bracket into it
step 3 - build 2 legs of your tripod + the yoke - flat on the ground - so you have a ` vee ` with the ground ends secured to the bases by loose clevis
pins
step 4 - attatch your payload - and all elecrics etc - and lightening conductor - and test EVERYTING - remember you will need IP 67 connections al
the way down - and fix everything to be wind resisatant - inservice maintainance will be trickey
step 5 - errection - this is the " fun " part - that is easier said than done - there are so many ways it can go wrong - it is not funny
basically you are going to raise the 2 ` fixed ` legs incrementally – and attach the 3rd leg in sections from the top down
it sounds easy – but doing it without warping is harder than it sounds
here are a few illustrations – nothing to scale just a demonstration of concept
get your vee of 2 legs attached to two of your bases – and attacht everything at the top end
Heres how it looks ` from the side `
Now to raise it
Use a simple a frame [ shown in red ] supplemented by supports [ green ] to raise the top end with block and tackle – and simply fit the 3rd leg [
blue ] from the top down
PS – having a ` hinge ` at this joint will make life a lot easier – and less stressfull – for both you and the errection
And up she goes – once you reach the limit of you’re a frame – simly move it back beyond the ground pivot – and pull it up
Also – once you have sections of the 3rd leg on – you can “ push “ the leg up too using intermediate brackets – and a single spar
Lastly – up – secure the bottom of the 3rd leg to the last base – and its built
" just like that " - it sounds oh so simple - but actually raising it without warping - requires know how or blindingly good luck
it is possible though -
but like i say - there is a lot of prep and groundwork required to do this right and if one thing fails then over 300kg of steelwork is going to come
crashing down