re prop.

Top banana · 13 October 2008, 21:48

Took the new rib out today with waverunner to give it a trial, great day, had most of Tremadog bay to ourselves. The ribcraft performed just as expected,
but have a dilema on prop choice, maybe some one with a simillar set up could advise, the prop that came with the rib was a 19" pitch and we had our doubts before setting off. the max revs for the suzuki is 6,000. With a good blip of the throttle we were hitting 5,000 revs then straight up to 6,000 with plenty of travel left in the throttle. we were then doing 37knts. but not wanting to over rev the engine we had to keep under 6,000revs.
The 19" will have to go and barring being able to borrow a 21" or 23" which would be the logical prop to go for. We did try dickies boat yard to see if they had any props to lend us as sujested by Jono but to no evail.

codprawn · 14 October 2008, 12:50

I would go for a 21" - maybe a 4 blade. And don't worry about over revving - it will have a limiter built in!!!

Try pushing the throttle all the way and see what happens - it could just be dead travel.

Chris · 14 October 2008, 14:23

Quote:

Originally Posted by codprawn

And don't worry about over revving - it will have a limiter built in!!!

Try pushing the throttle all the way and see what happens - it could just be dead travel.

Errrm are you sure that is sound advice for a new engine that I should imagine is being run in?

TB - Have you checked the props for sale / trial thread to see if anyone has a prop you could try?

I would say 21" or possibly 23" would be a good start. If you are after top speed then 3 blade probably better than 4

Chris · 14 October 2008, 14:29

http://cgi.ebay.co.uk/Suzuki-Stainle...d=p3286.c0.m14

Or this one. Going for £5 on ebay at the moment, could be a steal

codprawn · 14 October 2008, 15:27

Quote:

Originally Posted by Chris

Errrm are you sure that is sound advice for a new engine that I should imagine is being run in?

TB - Have you checked the props for sale / trial thread to see if anyone has a prop you could try?

I would say 21" or possibly 23" would be a good start. If you are after top speed then 3 blade probably better than 4

If it's being run in I wouldn't be going anywhere near 6000 either!!!

Jono · 14 October 2008, 15:53

Don't worry about 6000 revs... there's a "boat dealer" on here who reckons they'll rev to over 8000.....

Jono.

PS..... I'm talking out of my "elbow"....

jyasaki · 14 October 2008, 16:33

Quote:

Originally Posted by Chris

Errrm are you sure that is sound advice for a new engine that I should imagine is being run in?

If he's already revving to 6K, the break-in is out the window anyway.

Can't really make a guess on choice without knowing what it's doing now.

jky

Top banana · 14 October 2008, 18:51

cheers for the help guys, When i say new rib, What i meant was new to me
Its a couple of years old so no probs with running in. but i had it on the lap top and it is showing several over rev periods.
Having allso talked to Ribcraft today they sugested trying either a 3/16/21.5
or 3/16/23. Cheers Chriss had already been alerted to the Ebay prop,and that sounds like a good starting point. have allso been loaned a 3/15/21 prop so things are certainly looking up.Trying to get all the niggles sorted so we can come down for the solent cruise.
Next sort out a reliable fuel sensor, as the float gauge seems all over the place. any sujestions.

JSP · 18 October 2008, 20:25

Dickies would over charge you anyway, one of the dearest places I've been in.

Bigmuz7 · 18 October 2008, 22:35

Quote:

Originally Posted by codprawn

maybe a 4 blade

Dont talk mince codders,... 4 blades wont help the man .. not that way anyway