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12-15-2017, 03:34 PM
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#1
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Ensign
Join Date: Oct 2016
Posts: 9
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Bigger Trim Tabs!
Howdy, '92 2300 SCR, 5.7, Alpha I, 3 blade 14 pitch aluminum prop, usually loaded with 5 adults (my three kids got a lot bigger in the last year!), a dog and a cooler... boating at 3600' elevation (Lake Powell).
I installed a new swim platform in June of '17, a very nice addition indeed! After the install she struggled to plane and didn't want to stay on plane. My mechanic said to try bigger tabs, so I found a set of 9x18 (the old ones are 9X12) on ebay for $55. I used the existing rams and had them on within two hours. What a difference! She pops right out now and I picked up some rpms and speed! I am going to put the 15 pitch she came with back on next trip and see what happens, she is winterized right now. As a disclaimer, I will mention the air temperature last trip was about 40 degrees cooler which probably gave me a little more peak power...
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12-15-2017, 04:32 PM
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#2
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Moderator
Join Date: Apr 2008
Posts: 5,675
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Are you sure 14" and 15" is the Pitch and not the Diameter? When I run through a prop calculator, I come up with options for 14" and 15" diameter and either 17" - 18" of pitch.
14" of pitch would be very low.
Diameter usually stays the same and pitch is what is tuned. There is only so much space to swing a blade between the prop shaft and the anti-ventilation plate.
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12-15-2017, 05:20 PM
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#3
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Ensign
Join Date: Oct 2016
Posts: 9
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The props are 16" diameter, I am hitting target RPM at 3600' elevation, we are loaded heavy, I've not had her on any other lakes at different elevation. The prop ears look like Mickey Mouse ears... I figure to get close to 40 mph with the 15 pitch.
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12-15-2017, 07:03 PM
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#4
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,587
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I didn’t know the Alpha could take a 16 inch diameter prop.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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12-16-2017, 03:52 PM
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#5
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Captain
Join Date: Jun 2016
Location: Mn.
Posts: 664
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The firs number on the prop is the diameter and the second number is the pitch (14.5X16) as an example!
I am with Mike as I have the same drive and I don't think a 16 diameter prop will fit!
Don
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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12-16-2017, 05:02 PM
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#6
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,587
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Did a little reading and it seems a 16 inch will fit but is used on houseboat applications. Just doesn’t sound right for the OPs boat nor have I heard of someone using this diameter before.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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12-17-2017, 01:00 AM
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#7
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Admiral
Join Date: Mar 2012
Location: Lake Powell
Posts: 1,613
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Lake Powell = The Best Lake EVER!!!!
We are heading up for 3 days tomorrow.
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12-17-2017, 01:15 AM
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#8
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Ensign
Join Date: Oct 2016
Posts: 9
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Pretty Sure...
I’ll put a tape on it when I get home. Some of y’all are taking this a little too personal... My boat has been serviced by the same shop since 1993. I thought this was about trim tabs! How many of y’all “experts” are dealing with altitude? Anywho, Merry Christmas!
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12-17-2017, 01:16 AM
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#9
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Ensign
Join Date: Oct 2016
Posts: 9
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Awesome!
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12-17-2017, 01:25 AM
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#10
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Ensign
Join Date: Oct 2016
Posts: 9
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Powell, that is...!
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12-17-2017, 04:48 AM
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#11
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Captain
Join Date: Jun 2016
Location: Mn.
Posts: 664
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You brought up the prop not us!!!!~!
Don
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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12-17-2017, 05:02 AM
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#12
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,587
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Quote:
Originally Posted by donald
You brought up the prop not us!!!!~!
Don
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Yep. Might not be an expert in altitude boating but you brought that into the discussion.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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12-18-2017, 04:24 PM
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#13
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Moderator
Join Date: Apr 2008
Posts: 5,675
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Quote:
Originally Posted by DANWHOLIKESTOFISH
How many of y’all “experts” are dealing with altitude? !
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I'm not taking anything personally. I wish you the best of luck.
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12-20-2017, 05:50 PM
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#14
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Ensign
Join Date: Oct 2016
Posts: 9
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On the boat: 48 16338 A40 14P, will post again when spring gets here with news on the 15P. Thanks. Merry Christmas.
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10-20-2018, 11:00 PM
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#15
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Ensign
Join Date: Oct 2018
Posts: 3
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Where did you get swim platform looking for one 97 1900
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02-04-2019, 08:02 PM
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#16
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Ensign
Join Date: Oct 2016
Posts: 9
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Swimplatforms.com, Phoenix, AZ.
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