Rear Deck Block Size

[sonic]

Fairly new to the sport. Have an older DN just put a rear block adjuster on the deck. Was wondering what the difference is between running small blocks opposed to larger ones?

[Bob Rast DN1313]

Not  much difference,some sailors like small blocks to get boom lower on the deck.
some like larger blocks better mechanical advantage, more head room when tacking
And some sailors use a riser with either small or large blocks
Bob rast
DN 1313

[sonic]

Thanks for the feedback bob just got a new boom from ron and still figuring out the block placement. I think i will switch to the larger blocks i could use more head room.

[Bob Rast DN1313]

I use a 2" riser and like the clearance,when on port you can sheet out a little and look under the boom instead of a small window in the sail also keeps you goggles on when you tack .
I started with a track on a 1 Inch square tube (steering tube and eventually added another piece under  to get 2"

[sonic]

Thanks for the advise going to start off without it and see how i do. Always have the summer to work on the riser and i like the pics you posted.

[Geoff Sobering]

Thanks for the advise going to start off without it and see how i do.

That's the approach I would take.

FWIW, I think the two sizes of blocks people commonly use are 40mm and 57mm, so the difference isn't very big either way.

There's a related post about boom/deck height (and the reason you want the shortest distance) I made in a thread about the Forstman boom that might be interesting: http://dnamerica.org/forum/index.php?topic=1061.msg3529#msg3529

[sonic]

Funny i read that the other day. I found the forstman boom did make a difference in performance. I'm just tweaking the block sizes around and the placement of them.