My experience (and I've played with 12, 14, 16, 18 and 20-inchers) is
you probably won't feel much seat-of-the-pants difference by propping
down only one increment or just 2-inches less in pitch. You will see
it on your top-end and final WOT engine RPM, but I'd go to a 14 x 14,
if you want the holeshot effect. If the 14-pitch doesn't get you
there, try the 13-inch SST and add the hydrofoil. Beyond that it gets
(really) expensive and hence impractical for most: re-gearing, trim
tabs, or re-powering for more torque/horsepower.
You didn't say -- but are you trying to yank up a 250-lb'er on a
slalom ski? Also, have you weighed the boat (on a public scale) to see
if it's lugging a few hundred pounds of water around under the floor?
Sometimes these symptoms are subjective and actual data can help
analyze the situation better.
Lee
On Jun 7, 2009, at 10:28 AM, <wheresjerry@...> wrote:
> The prop that came w/ the boat is a 14x18....I have a guy that will
> sell me a 14x16 prop that will fit. I am more for getting out of
> the hole than overall top speed, so I am hoping that a lower pitch
> prop, and foil might help me dramatically. Thanks for the input,
> and if anybody else has more to give, let me have it!
>
>
>
>
> karl/wheresjerry banach
> 105 browns pasture rd
> strafford, nh 03884
>
>
>
> --------------------------------------------------
> From: <omc-boats-request@...>
> Sent: Sunday, June 07, 2009 12:00 PM
> To: <omc-boats@...>
> Subject: OMC-Boats Digest, Vol 26, Issue 17
>
>> Send OMC-Boats mailing list submissions to
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>>
>> Today's Topics:
>>
>> 1. 1969 silverline riviera (wheresjerry@...)
>> 2. Re: 1969 silverline riviera hole shot (DOUGLAS JULIEN)
>> 3. Re: 1969 silverline riviera hole shot (Lee Shuster)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Sat, 6 Jun 2009 14:10:41 -0400
>> From: <wheresjerry@...>
>> Subject: [OMC-Boats] 1969 silverline riviera
>> To: <omc-boats@...>
>> Message-ID: <BAY117-DS8902F50ABFE0574090D52AD490@...>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Going to finally get my boat in the water this weekend for it's
>> second season in almost 20 years. I have been in the process of
>> rebuilding the boat and the usual stuff it has required after
>> spending 18 years in a garage. I have an OMC Stringer Buick v6 w/
>> 155 hp.
>>
>> Last season, I noted it had trouble getting out of the hole, (heavy
>> tri-hull) and had looked into the possibility of getting a SE
>> Sport 300 Hydrofoil, question is, has anybody had good luck out
>> there with a similar vintage boat?
>>
>> Thanks!!
>>
>>
>> karl/wheresjerry banach
>> 105 browns pasture rd
>> strafford, nh 03884
>>
>> -------------- next part --------------
>> An HTML attachment was scrubbed...
>> URL: <http://lists.ultimate.com/mailman/private/omc-boats/attachments/20090606/3cbaf2a6/attachment-0001.html
>> >
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Sat, 6 Jun 2009 14:08:55 -0700 (PDT)
>> From: DOUGLAS JULIEN <dfjulien@...>
>> Subject: Re: [OMC-Boats] 1969 silverline riviera hole shot
>> To: "Evinrude & Johnson Boats of the 1960's and 70's"
>> <omc-boats@...>
>> Message-ID: <553945.65790.qm@...>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Hi Jerry:?
>>
>> The Silverline is longer but lighter than a Sportsman 155, so hole
>> shot should be fine.? The hydrofoil is mostly useful for reducing
>> porpoising - sometimes a problem with tri-hulls.? If I were you I'd
>> make sure the engine is performing properly, first, then I'd try a
>> lower-pitch prop.? With props you must choose what is more
>> important - acceleration out of the hole, or top speed/fuel
>> economy.? With a lower-pitch prop your acceleration will increase,
>> but your putt-putt speed will decrease, so you won't be ramming so
>> many docks.
>>
>> -Doug Julien
>>
>>
>>
>> --- On Sat, 6/6/09, wheresjerry@... <wheresjerry@...> wrote:
>>
>> From: wheresjerry@... <wheresjerry@...>
>> Subject: [OMC-Boats] 1969 silverline riviera
>> To: omc-boats@...
>> Date: Saturday, June 6, 2009, 1:10 PM
>>
>>
>>
>>
>> Going to finally get my boat in the water this weekend
>> for it's second season in almost 20 years.? I have been in the
>> process of
>> rebuilding the boat and the usual stuff it has required after
>> spending 18 years
>> in a garage.? I have an OMC Stringer Buick v6 w/ 155 hp.
>> ?
>> Last season, I noted it had trouble getting out of the
>> hole, (heavy tri-hull) and had looked into the possibility of getting
>> a?? SE Sport 300 Hydrofoil, question is, has anybody had good luck
>> out
>> there with a similar vintage boat?
>> ?
>> Thanks!!
>> ?
>> ?
>> karl/wheresjerry banach
>> 105 browns pasture
>> rd
>> strafford, nh? 03884
>> ?
>> ?
>> -----Inline Attachment Follows-----
>>
>> _______________________________________________
>> OMC-Boats mailing list
>> OMC-Boats@...
>> http://lists.ultimate.com/mailman/listinfo/omc-boats
>> -------------- next part --------------
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>> >
>>
>> ------------------------------
>>
>> Message: 3
>> Date: Sun, 7 Jun 2009 08:35:28 -0600
>> From: Lee Shuster <lks@...>
>> Subject: Re: [OMC-Boats] 1969 silverline riviera hole shot
>> To: "Evinrude & Johnson Boats of the 1960's and 70's"
>> <omc-boats@...>
>> Message-ID: <D11996CF-E694-4100-91C4-E1C065F30B18@...>
>> Content-Type: text/plain; charset="us-ascii"; Format="flowed";
>> DelSp="yes"
>>
>> Carl,
>>
>> Doug's comments are right-on the money.
>>
>> You didn't mention your boat's gross weight or length, but assuming
>> it's typical, you can check your boat's theoretical performance
>> using
>> this calculator:
>> http://hhscott.com/evinrude/docs/BSLAC.htm
>>
>> What this calculator will basically reveal our the laws of physics,
>> which you are up against.
>>
>> I have done a ton of waterski pulling in a variety of situations with
>> my tri-hull Evinrude sportsman. I have a disadvantage that you don't
>> have and that is I do it at 7500 Ft Above Sea level so I give 25%
>> right away.
>>
>> Three things you can do to improve getting out of the hole:
>>
>> 1) Prop properly: Use a 13-inch OMC SST. The stainless steel has less
>> flex and will bite better. Next best is a 14 inch Alum. The 12-inch
>> prop is too much of a compromise. You will give up fuel economy and
>> top speed. (You could also change upper case gear ratios but that
>> would be very expensive and not practical).
>> 2) Install trim tabs. They when placed in the down position, they
>> will
>> raise the stern (Lower the bow) and help the boat get on plan better.
>> Conversely you can move all you passengers to the bow (not very
>> practical or safe).
>> 3) A foil (which extends the area and lift of the anti-ventilation or
>> cavitation plate) will help somewhat, but in my experience it has the
>> least effect and that's why I've placed it third in this list. It
>> does
>> help in turns to keep the prop from catching air and "blowing out"
>> resulting in over-revving. I've got a String-Ray (and like it) from
>> Marine Dynamics: http://www.marine-dynamics.com/ But don't expect
>> it
>> to perform miracles. It is probably the most cost-effective
>> improvement you can make.
>>
>> Lee Shuster
>>
>>
>> On Jun 6, 2009, at 3:08 PM, DOUGLAS JULIEN wrote:
>>
>>> Hi Jerry:
>>>
>>> The Silverline is longer but lighter than a Sportsman 155, so hole
>>> shot should be fine. The hydrofoil is mostly useful for reducing
>>> porpoising - sometimes a problem with tri-hulls. If I were you I'd
>>> make sure the engine is performing properly, first, then I'd try a
>>> lower-pitch prop. With props you must choose what is more important
>>> - acceleration out of the hole, or top speed/fuel economy. With a
>>> lower-pitch prop your acceleration will increase, but your putt-putt
>>> speed will decrease, so you won't be ramming so many docks.
>>>
>>> -Doug Julien
>>>
>>>
>>>
>>> --- On Sat, 6/6/09, wheresjerry@... <wheresjerry@...> wrote:
>>>
>>> From: wheresjerry@... <wheresjerry@...>
>>> Subject: [OMC-Boats] 1969 silverline riviera
>>> To: omc-boats@...
>>> Date: Saturday, June 6, 2009, 1:10 PM
>>>
>>> Going to finally get my boat in the water this weekend for it's
>>> second season in almost 20 years. I have been in the process of
>>> rebuilding the boat and the usual stuff it has required after
>>> spending 18 years in a garage. I have an OMC Stringer Buick v6 w/
>>> 155 hp.
>>>
>>> Last season, I noted it had trouble getting out of the hole, (heavy
>>> tri-hull) and had looked into the possibility of getting a SE
>>> Sport 300 Hydrofoil, question is, has anybody had good luck out
>>> there with a similar vintage boat?
>>>
>>> Thanks!!
>>>
>>>
>>> karl/wheresjerry banach
>>> 105 browns pasture rd
>>> strafford, nh 03884
>>>
>>>
>>>
>>> -----Inline Attachment Follows-----
>>>
>>> _______________________________________________
>>> OMC-Boats mailing list
>>> OMC-Boats@...
>>> http://lists.ultimate.com/mailman/listinfo/omc-boats
>>> _______________________________________________
>>> OMC-Boats mailing list
>>> OMC-Boats@...
>>> http://lists.ultimate.com/mailman/listinfo/omc-boats
>>
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>> OMC-Boats mailing list
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>>
>> End of OMC-Boats Digest, Vol 26, Issue 17
>> *****************************************
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Received on Sunday, 7 June 2009
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