This is only the same scenario as with a hybrid alloy tube/wood topmast, so I wouldn't be concerned about it, so long as the design of the joint is good, and the joint is as high up as possible (ie, if there is excess length, trim it from the top). I'd bond the join with toughened epoxy, I'd prefer not to rivet.

If the tube diameter is chosen well, for sufficient strength and stiffness, there's no need for a sleeve, and in any case, it's difficult to find tubes that mate well. My mast has an internal sleeve that was made by cutting a lengthwise sliver out of a piece of tube, compressing it and hauling it in - I'm not at all sure that it does a great deal of good.

PJR talks about adding a sleeve (inner or outer) at the partners to spread out the bending force.  Sounds sensible to me. What do others think

Hello, 

I've just received quotations for lamp posts for use as unstayed masts. Needless to say, the cable entry hole and access door would not be cut. The options for finish are: 

10m 222x5 base, conical column, brushed finish:  £995.29; clear anodised:  £1,033.51 or powder coating: £1,075.82

The appearance of a white powder coating appeals, and I believe this may be durable enough to withstand the wear usual in a junk rig, but I'm not sure anodising might not be the best option.

Any views?

Incidentally, the company providing these quotes is the Aluminium Lighting Company, Port Talbot, Wales.

Cheers, Asmat