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 Author  Topic: Elco Rudders
  TED WALTHER

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of TED WALTHER   Send Email To TED WALTHER Posted on: Jul 3, 2013 - 6:17pm
Jerry;
I knew you would like that one! That 77' Elco had to be PT 66 RON 8, she is the only one I know of that made it back to P.I. This was July 4, 1945 right? PT 66 was re-designated a small boat on Feb 23, 1945. Even though, her motor macs must have really loved the "Cheetah" to have her moving like that! I wish someone had actually filmed this race, it would be great to watch!
Take care,
TED
HAPPY 4TH OF JULY!!!!!!


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TheBridge

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of TheBridge  Posted on: Jul 5, 2013 - 3:43pm
Roy, my PT-157 model has three motors/shafts/props and when running it throws up the identical rooster tail and 'trough' behind the fantail (stern) when running at higher speeds such as I see in still photos and film of PTs of the period. It evens has the pronounced yaw when running in reverse as noted by skipper in an article a read some time ago..

I can say that given the running characteristics of my PT-157 very closely (if not exactly) emulates the those of the full scale boat, the rudders provide ample maneuverability. It surprised me as as well considering their smallish size however whether be the total square inches of area (when all three rudders are added together) or the rudders' placement right in back of the props or maybe even both, it is fine. I'm not aware of any complaints by Skipper Liebenow of the 157, of maneuverability in this regard but will ask the next time I speak with him.

To the point that the rudders maybe were shorter as they patrolled hallow waters, the props were about another 12 to 14 lower then the bottom of the rudders so I don't think that was a design limitation and even here the center prop/rudder were much lower then the outer props/rudders.

The PT-157 model emulates the full size version in maneuverability very well....

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bubbletop409

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of bubbletop409  Posted on: Jul 10, 2013 - 11:29pm
I am currently doing a scratch build of a 1/16th scale 85' Air Sea Rescue Boat from plans drawn by Al Ross. These boats were very similar to the 80' Elcos in general hull shape and powered by two Packards. The rudder size and shape are also similar to the Elcos, however while the props were located 45 inches outboard from hull center line, the rudders were much farther apart being 64 inches outboard from center line.

I wonder what the reason was for such an un-conventional setup, and what if any benefits were derived from that arrangement?

Larry
62 Bel-Air
260 Eagle EXP
79 Cole TR-2

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