[Public-List] A-4 Two blade propeller survey

[Gordon Laco]

Right on, George.  A30’s back up exceptionally well, so long as one doesn’t try to make them do things they can’t.  Holding a straight course in reverse is one of the things our boats do very well, provided you let the boat do it as you describe below.


Gordon Laco
426 Surprise
www.gordonlaco.com




> On Apr 26, 2020, at 11:57 AM, George Dinwiddie via Public-List <public-list at lists.alberg30.org> wrote:
> 
> I have the stock 13x7 two-blade, and it works just fine.
> Hull speed is around 1500 RPM, I think, but my tach hasn't worked for many years.
> Thrust is fine in both forward and reverse, though not what Mike Lehman gets with his diesel 3-blade. But it's adequate.
> Prop walk helps me turn the boat in tight quarters. I make sure I try to turn to starboard.
> I've seen Phil Beigel back up a hundred yards or more, straight as an arrow. The key seems to be to get a lot of thrust at first, and then go to idle or neutral so the water flowing past the keel directs the boat in a straight line.
> 
> - George
> 
> On 4/25/20 1:10 PM, charles pleisse via Public-List wrote:
>> If your Alberg 30 has an Atomic 4 with a two blade prop,
>> What diameter is you propeller?
>> What is the pitch is your prop?
>> At what RPM do you achieve hull speed?
>> How content are you  with,
>> forward thrust
>> reverse thrust
>> amount of prop walk
>> Charles Pleisse
>> Sookie #221
> 
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