[Rhodes22-list] motors

[Brad Haslett]

Bill,

Tuesday for you, we're almost exactly opposite sides of the world.  I'm on
reserve to teach over the weekend and have a full schedule of students the
following week. Two weeks in China is about the limit of my attention span
so I'm more than ready to go home.  We've got a big family dinner tomorrow
(family dinner bullshit is universal) and then Jia wants to show me another
real estate deal (don't bet against her advice, you will lose).  There's no
reason to go shopping this trip, that's what Walmart is for.

Brad

On Sat, May 31, 2008 at 11:01 AM, Bill Effros <bill at effros.com> wrote:

> When is Wednesday in China?  MJM always makes good points, and I'll have
> to think about what he says.  Plenty of time, just thinking, and I don't
> have to be able to think as fast as he does.
>
> B.
>
>
>
> Brad Haslett wrote:
> > Bill,
> >
> > MJM's got a point here.  Someone who is better with physics can explain
> all
> > this but for the max ooompth you need a bigger prop at lower rpm's.  To
> get
> > 8hp out of an 8hp engine you need to run it wide open.  Getting 8hp out
> of a
> > 15hp engine would be about 60% power and near the peak of the torque
> > curve, and, you'd be turning a bigger screw at a more efficient rate.
> > Nothing beats cubic inches! (that's what the girls tell me anyway)
> >
> > Brad
> >
> > On Sat, May 31, 2008 at 10:49 AM, Bill Effros <bill at effros.com> wrote:
> >
> >
> >> Thanks, Michael,
> >>
> >> So nice to hear your voice.
> >>
> >> B.
> >>
> >>
> >>
> >> michael meltzer wrote:
> >>
> >>> Bill get the Yamaha t9.9 high thrust, the issue you are having are not
> >>>
> >> hp,
> >>
> >>> but getting the hp into the water, the  11 3/4 inch prop with the high
> >>>
> >> cross
> >>
> >>> surface area turning slow (the 2.92 gear ratio) is what you need, have
> >>>
> >> stan
> >>
> >>> use the long rails on the boat(i.e they go above the transom) and get
> the
> >>>
> >> 25
> >>
> >>> inch version (it will give you more wave height).
> >>>
> >>> Ran it for years on the sound in gale warnings, all you need, the
> problem
> >>> when you get down to it is the Tohatsu is designed for a light planning
> >>> boat(i.e. a small high pitched prop turning fast, and changing it prop
> >>>
> >> does
> >>
> >>> not help, the "size is constrained" and gear ratio is fixed), it will
> >>>
> >> work
> >>
> >>> in claim days but pushing it is fails... not sure the 15 Tohatsu helps,
> >>> still wrong gear/propsize so you will never get the rmp's for the hp
> (it
> >>> only 15 hp when the motor is turning 5000+ rpm and hull speed will
> >>>
> >> prevent
> >>
> >>> that or it will be "forming" up the water without doing much)
> >>>
> >>> -mjm
> >>>
> >>> Ps. What to waste some money on a remote kit on the Tiller?
> >>>
> >>>
> >>>
> >>> -----Original Message-----
> >>> From: rhodes22-list-bounces at rhodes22.org
> >>> [mailto:rhodes22-list-bounces at rhodes22.org] On Behalf Of Bill Effros
> >>> Sent: Friday, May 30, 2008 9:59 AM
> >>> To: The Rhodes 22 mail list
> >>> Subject: Re: [Rhodes22-list] motors
> >>>
> >>> Too Bad!
> >>>
> >>> The Tohatsu 15 weighs only 114 lbs -- 10 lbs more than the current
> >>> Yamaha 9.9, and about the same as earlier Yamahas that were ripping the
> >>> motor mounts off R-22s.  (I've gained more than 10 pounds since I
> >>> started sailing my Rhodes, and I sit in the back of the boat, too.)
> >>>
> >>> Stan can beef up our motor mounts.
> >>>
> >>> What do you suppose would happen if you put the 15 on an R-22?
> >>>
> >>> I'm roughly 35 statute miles from NYC.
> >>>
> >>> It takes me roughly 7 hours motoring each way.  (5 mph ((not kph) seems
> >>> to be the top sustainable cruising speed for almost any sailboat in the
> >>> 20-40 foot range as a practical matter.)
> >>>
> >>> Could I travel at 10 mph for 3 1/2 hours if I had a 15 hp motor?  Would
> >>> the boat become completely unstable?  Has anyone tried?
> >>>
> >>> Bill, you could have been the first!
> >>>
> >>> Bill Effros
> >>>
> >>>
> >>>
> >>> Bdunn1 at aol.com wrote:
> >>>
> >>>
> >>>> I checked today; the only difference between the 9.8 and the 8 hp has
> a
> >>>> smaller carburetor and smaller air induction.   I purchased the 9.8.
> >>>> Bill Dunn
> >>>>
> >>>>
> >>>>
> >>>> **************
> >>>> Get trade secrets for amazing burgers. Watch "Cooking with
> >>>> Tyler Florence" on AOL Food.
> >>>>       (http://food.aol.com/tyler-florence?video=4&amp;
> >>>> ?NCID=aolfod00030000000002)
> >>>> __________________________________________________
> >>>> Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> >>>>
> >>>>
> >>>>
> >>> __________________________________________________
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> >>>
> >>> __________________________________________________
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> >>>
> >>>
> >>>
> >> __________________________________________________
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> >>
> >>
> > __________________________________________________
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> >
> >
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