Thinkin' of a New Prop for My 'Rude

[Hooper]

Hi Guys-

I got a suggestion from someone recently who suggested I drop from the 14 3/4 x 19 three blade stainless to a 17. I was told that I would turn up more rpm's and attain a higher cruise.

He runs the same 225 Ficht on his 23 SeaCraft and gets much better performance numbers than I do on mine...

I run about 5400-5500 rpm and get a cruise of about 25-26kts at 4500prpm's.

I would appreciate your thoughts...

-Hooper

[Capt Chuck]

Hoop

Running a 250hp with a 3 blade S/S 17" Viper Prop without a bracket on my 23'. I have a T-Top, full fuel of 135 gal and 15 gal water and equipment:

According too GPS and system matched gauges, here's my numbers:

RPM GPS MPH
3500 13.5 (not planed off)
4300 30.0 (cruise)
4500 33.4
5000 37.9
5400 40.5
6000 46.0 (Trimmed)

I hope this helps [img]/images/graemlins/wink.gif[/img]

[afernand]

Capt Chuck: what is the weight of your boat when fully loaded? Is there a "formula" that lets you calculate the size engine for a given boat weight? Thanks for info, aaf.

[Hooper]

Thanks Capt. Chuck

Looks like it is probably worth a shot at least... [img]/images/graemlins/wink.gif[/img]

[Capt Chuck]

aaf

what is the weight of your boat when fully loaded? Is there a "formula" that lets you calculate the size engine for a given boat weight?

Sorry, I don't know the weight nor a formula but I do have a Theory [img]/images/graemlins/tongue.gif[/img] "Move the beer to the bow and the fat girlfriend to the center of the boat when your feet get wet" [img]/images/graemlins/grin.gif[/img]

[FELLOW-SHIP]

Ha Hooper
All the SeaCraft I have seen at the showroom with 225 on the back run 17”. I have talked to a some prop guys which also said run a 17” I also looked a performance charts of similar boats and that seemed to point to a 17” there has been some discussions on this site in the past and most guys also said run a 17” so when it was time to buy a prop I bought a new 17” for my 225 Yamaha. It gives me what I am looking for I don’t have lots of figures for you but I can bring it up to 5600 rpm’s and I cruse around 3400 to 4000 depending on sea conditions and desired speed. I would save the 19” for your spare prop.
FellowShip [img]/images/graemlins/grin.gif[/img]

[afernand]

Thanks for the good info! But I'd rather use all beer for the balancing.-- aaf

[Hooper]

Fellowship

Much thanks for the info. I wanted some feedback before I throw the cahs down on a new one. I am going to see if my dealer has a shop prop to experiment with first, if not, I'll just bite the bullett.

Thanks a lot, Hooper