[Rhodes22-list] motors

[Bill Effros]

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)
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>>>>
>>>>
>>>>         
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>>>       
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