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Message |
    
Scott Walters
Member
Username: air0msw
Post Number: 9
Registered: 11-2005
| | Posted on Sunday, October 11, 2009 - 12:10 pm: | 
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I am converting my 2001 Glastron GS249 5.7 from a Volvo SX to a DP outdrive. My boat is about 25' long and weighs about 5800 lbs wet. Which props would anyone recommend for this? I am looking to have a decent hole shot while keeping my top end speed. Appreciate any suggestions. |
Byron Withjack
Member
Username: byron
Post Number: 4
Registered: 12-2006
| | Posted on Sunday, October 11, 2009 - 07:22 pm: |
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I have a 2006 Larson Cabrio 260. It weighs in at 6400 lbs. It's powered by a 5.7 g.x.i. 320 hp. Specs read out max r.p.m. at 5200. When I got the boat new it came with F-6 duo props. and only maxed at 3900 r.p.m. I complained to Larson and they sent me a new set of F-4 duo props. I now max out at 4900 r.p.m. at 41 m.p.h. The hole shot is good around 6 sec. to plane. I cruse at 3,400 r.p.m.'s going around 27 m.p.h. burning 8 g.p.h. Which is comfortable with a boat at 27 l.o.a.
With your boat I feel that the F-4 duo props a good choice. F-3's would probably get you to high on the r.p.m.'s with your weight and length. Each step up or down on the F series duo props will mean around a 500 r.p.m. change. At a list of $1,400.00 a set you don't want to miss. |
Ricardo E.
Advanced Member
Username: ricardomarine_vp
Post Number: 669
Registered: 03-2009
| | Posted on Sunday, October 11, 2009 - 11:56 pm: |
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With the Duo Prop, you must perfrom the WOT RPM test just as you would with the single prop drive, in order to determine which prop set is suitable.
It's Trial and Error, my friend. |
Brett S
Advanced Member
Username: roscoelab
Post Number: 137
Registered: 09-2007
| | Posted on Monday, October 12, 2009 - 01:54 pm: |
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I have a 2001 glastron gs229 with the 5.0 tbi GI motor, the question is wether your carburated, tbi or tpi injected, a gx, a gi or a gxi. if you want an opinion i agree with Byron, you will need a F4, maybe an F3. I run a F4 at 3900 ft turning 4900 rpm, my boat is about 1500 lb lighter, I run a F3 at 6000 ft at 4800rpm (lake powell and flaming george). If you find a prop shop with a few of these F props you may be able to do some trial and error, and as he said at 1400 a shot it can get expensive. Ebay has some deals when you can find them. if ya want to buy a used F3 set,e mail me. |
Scott Walters
Member
Username: air0msw
Post Number: 10
Registered: 11-2005
| | Posted on Monday, October 12, 2009 - 05:06 pm: |
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It is a carb. I do most of my boating on Lake Cumberland in Kentucky which is probably about 680 ft. I was thinking F4 but everything I have read makes me think I am right on the edge of using either a F3 or F4. Thought about contacting Glastron and see what they use from the factory. I might be interested in the F3. I will let you know. |
Connor Davis
New member
Username: cdavissc
Post Number: 1
Registered: 11-2009
| | Posted on Thursday, November 05, 2009 - 06:59 pm: |
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I have a 25 ft Seacraft Seafari, 25.5 degree deadrise, 5.7 Gsi 280 hp, max rpm range 4600-5000. Duoprop, D2 aluminum props.
Loaded for a long trip, it weighs about 5600 lb. and turns 5050 max rpm (at sea level). Loaded light, it will turn 5200. I need more prop.
The volvo book says rpm drops 200-250 with each higher number and go one more number up if going from aluminum to stainless. If that's right, going to an F4 would give me a max rpm loaded heavy of 4800. Does this sound right?
Prop shops in my area say they can take a duoprop up or down one number, i.e. F3 to F4. Any different opinion?
Thanks |
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