Posted by PaulW on
URL: https://forum.mymorbic.uk/Mast-weight-tp468p515.html

‘Morning Carlos.
You ask “… but 1,5 Kg, is that serious?” – Where does that value appear?
Other thoughts:-
With the wider mast diameter you’ll need a larger hole in the deck.  (Obvious - Sorry!)
Some mast fittings, and mast related features, may need to be up-scaled, though I’ve not thought about which they might be.  Traveller and halyard sheave come to mind.
Re-enforcement of attachment points could be necessary. E.g. cleat/s, bowsprit attachment (if relevant to your build).  Maybe others.

FWIW, I re-paste what I’d copied from an email I’d written on 11/07/2020.  
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(NB - This refers to Sloop rig mast.)
Mast timber as supplied 10.9kg
Mast planed square tapered. 7.9kg
Mast rough round? 6.2kg
Mast round. Nearly finished. 5.9 kg*
Amount removed. 5.0kg.

Yard. As supplied. 3.26
Yard. Finished. 1.66kg
Amount removed 1.60kg

*This would be before final sanding, cutting slot for sheave, trimming sides of base to create the lug which locates in the step, and all long before D1/D2 treatment and fitting the sheave and the pintle-mount for the boswsprit 
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I hope this helps.  
At the moment it’s not viable to weigh our mast and spars because they are at the lake 8kms from home, and the sail is attached.