I just saw this online. never knew it existed. how are these booms with the internal adj outhaul ? good.... bad ? can you use a shim ? my slalom sails rig on an RDM mast.

Do you have a product link? I've only ever seen the LISA boom with the internal outhaul system, though I don't know anyone in my local that's shelled out for it. Common sense would also dictate that something internal is going to be harder to repair than a traditional external outhaul, where you can easily go to your local sailing club and find all the rope and pulleys you need.

I have couple of these NP Innerouthaul booms, had them for 3 years now and very happy with them,
I will point out the pro and cons
PROS
-very tidy and no clamps to bang your hands on in the gybe etc
-easy to pull apart and service if required, boom is fully dismantlable in all respects but I have not needed to service or change ropes or pulleys in my 3 years and 20,000km of sailing with them
-the NP RDM shim fits the boom head, so head is good for SDM and RDM
CONS
-price is high
-not as easy as external system to pull on rope and when letting off rope is a bit slower to spool out, this is because internal pulley is smaller diameter to fit inside tubing, in saying this I am happy with it's function
-where the cleat is mounted I pay attention not to let it allow sand to enter if laying rig on the beach because as with all booms you don't want sand in the tail to boom body connection

Hope this answers your questions
PM me if you need any more info or pics

Another PRO - boom diameter is nice too. I use one for my big sails. nb it didn't come with RDM shim

i got one when they first came out and sold it after about ten sessions. being used to the outline of the Severne and North/Duotone, i wasn't able to get used to the new position for my front hand.

i mostly agree with the PROs and CONs; with some extra comments:

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tonyk said..
PROS
-very tidy and no clamps to bang your hands on in the gybe etc
-easy to pull apart and service if required, boom is fully dismantlable in all respects but I have not needed to service or change ropes or pulleys in my 3 years and 20,000km of sailing with them
-the NP RDM shim fits the boom head, so head is good for SDM and RDM

* the oval/squash grip was very comfortable.
note that the RDM shim had to be purchased separately (this may have changed since), so that may be a CON.

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tonyk said..

CONS
-price is high
-not as easy as external system to pull on rope and when letting off rope is a bit slower to spool out, this is because internal pulley is smaller diameter to fit inside tubing, in saying this I am happy with it's function
-where the cleat is mounted I pay attention not to let it allow sand to enter if laying rig on the beach because as with all booms you don't want sand in the tail to boom body connection

* i did not find the adjustment system to be very friendly for changing sails sizes with 10cm or more difference in boom lengths. i like my sheets tidy and not a fan of lots of lines flapping about, yet i often ended up with something like that when changing sails in a hurry (long sheeting lines, traveler lines spilling out the back) - which greatly defeated the purpose of an internal system.

* the head is a generic one like you'd find on a contract mid-priced carbon boom rather than a premium product. locally, a number of sailors were breaking these heads regularly. the bloke that purchased my boom immediately changed it to a Streamlined head - and he loves the bend i couldn't get used to.

^^^^
That makes me sad to see a premium product fail early . All these years of development , and life spans are getting shorter Has Anyone priced one of these booms lately , frighteningly expensive . I would expect a frighteningly expensive boom to last unless crashing from a height or getting smashed in waves .

Thanks for the input. I guess I will go with external setup.