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Mar 19, 2006, 04:03 PM
Registered User
Nice weather job !

I thought the Elco had 3 tiny old paddle style rudders. Higgins had the biggie deep spade types.

Nice detail on the stern deck !
Mar 19, 2006, 04:09 PM
Hotjava
Pat,

Awesome!!!
I really love the turrets!

Oliver
Mar 19, 2006, 04:19 PM
Registered User
A real masterpiece, Pat. An especially fine job on the Dewandre turrets. Thanks for sharing her with us.
Bill
Mar 19, 2006, 04:36 PM
Red, White, & Mahogany
patmat2350's Avatar
Thanks all!

Quote:
Originally Posted by cyclops2
Nice weather job !

I thought the Elco had 3 tiny old paddle style rudders. Higgins had the biggie deep spade types.

Mine are quite a bit over scale, and the boat still won't turn worth a hoot.
See scale drawing attached, builder's drawing from the National Archives.

And photo of the Higgin's deep rudders. Note three same-handed props... same was done on Elco, simpler transmissions that way.

But real PTs COULD turn... check the 80 footer, above, in this ad. And the 80's were said to handle worse than the 77's!

PM
Last edited by patmat2350; Mar 19, 2006 at 04:51 PM.
Mar 19, 2006, 04:42 PM
"Old 8140"
Old 8140's Avatar
One word for this build ~~~ AWESOME !!!

Pat, great job.

Jim
Mar 19, 2006, 05:04 PM
Registered User
Pat
My 8' Higgins has over sized twin rudders, 20 % and twin screws.

At full speed, hard over is a instant bank into the turn and in 20 + feet, it is comming back at me. Out of the hole and on plane in 2 seconds.

What you and I have as turn differences agrees perfectly with WW II PTB captains who ran both types.

Thumbs up to us both.
Mar 19, 2006, 05:59 PM
Red, White, & Mahogany
patmat2350's Avatar
Quote:
Originally Posted by cyclops2
Pat
My 8' Higgins has over sized twin rudders, 20 % and twin screws.
Let's see that thing!
PM
Mar 19, 2006, 07:35 PM
Grumpa Tom
Kmot's Avatar
Awesome job!
Mar 19, 2006, 08:31 PM
Custom Course Wrecker..

Pats PT


It looks the same to me as when I first saw it.....

And I can tell you firsthand...it goes like stink (our term for fast)!!!!!!

Scott
Mar 20, 2006, 11:34 AM
Registered User
Pat. I think your turn problem is simple to cure and make yours actually out turn mine.

The bottom of the rudders in the picture are triangles. The have very little blade area in the props high flow area .
I can send you some scans by email of my rudders. I will take one off and you will see that they reach below the bottom of the 4.5" 5 blade props. They just clear the bullet tail piece.

I have the largest sailboat servo as the rudder servo to prevent sucking the rudder into a reversing prop. Overbalance of the rudder is 25 %.

Let me know if I can help more on the rudder.

Rich
Mar 20, 2006, 11:38 AM
Registered User
Pat. I found some model pictures. I can scan them to you . I tried posting them and got frustrated.
Mar 20, 2006, 12:37 PM
Red, White, & Mahogany
patmat2350's Avatar
Cyclops- if you have the pix as files, you can post 'em!
Just click on "Go Advanced", below;
scroll down to "Manage Files", click on "Manage Attachments".
Trick- after browsing and finding the files, you MUST hit "Upload", then wait a bit. It'll let you know when it's done;
Then "Close This Window";
Then "Submit reply".

Not hard, just not obvious...

PM
Mar 20, 2006, 12:51 PM
Red, White, & Mahogany
patmat2350's Avatar
Quote:
Originally Posted by cyclops2

Let me know if I can help more on the rudder.

Rich
Rich-
Yup, I'm sure that's it. The Midwest PTs have huge round rudders, set in the prop's path. Mine would just have to be so big to get down there, yuk. They're already like 200% big!
Well, if I really want zig-zag, I guess I can get a zip-zap racer.

PM
Mar 20, 2006, 01:46 PM
Registered User
The depth to the bottom of the prop is all important. As the rudder goes deeper, so does the boats leaning into the direction of the turn.

I can email the shape off of my plans to you to scale down or up as needed.

You will really enjoy the boat when she leans in on plane.

Go for it.


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