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Author Topic: Elco 77 : PT-41  (Read 5200 times)

Pat Matthews

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Elco 77 : PT-41
« on: September 25, 2006, 12:34:37 am »

Here's my Elco 77, which owes so much of course to Mr Scott Paine:
http://www.geocities.com/patspt41/

Pat Matthews
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Pat Matthews
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Voyager

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Re: Elco 77 : PT-41
« Reply #1 on: September 25, 2006, 12:47:30 am »

What a work of art your boat is :o....trully amazing stuff!


What is your next project?


Voyager.
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Pat Matthews

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Re: Elco 77 : PT-41
« Reply #2 on: September 25, 2006, 01:28:29 am »

Thx!
Well... just finished this one up:
http://www.geocities.com/patsmodels/valdivia/

now I need to clean the shop and figure just what's next!

PM
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Pat Matthews
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Shipmate60

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Re: Elco 77 : PT-41
« Reply #3 on: September 25, 2006, 01:41:05 pm »

Very nice model and good performance too.
What is she powered by?

Bob
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White Ensign

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Re: Elco 77 : PT-41
« Reply #4 on: September 25, 2006, 02:31:56 pm »

Pat- to put it in a short way: The art of modeling!

Great!
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Wetwater

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Re: Elco 77 : PT-41
« Reply #5 on: September 25, 2006, 08:53:01 pm »

A very nice boat and well detailed.
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Pat Matthews

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Re: Elco 77 : PT-41
« Reply #6 on: September 25, 2006, 10:46:29 pm »

What is she powered by?

Bob

Bob- Thx, and see the powertrain section on the website for more info, but simply 3 Speed 600's on 8.4v... no race baot, but good scale appearance when planing.
Pat M
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martno1fan

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Re: Elco 77 : PT-41
« Reply #7 on: September 26, 2006, 09:21:43 am »

both nice boats Pat but i have to say hats off for the Valdivia to build that boat as your first sail boat is really something.have you thought about building a scratch built boat from plans? or do you prefer kits?.i just finnished this one from scratch from plans i got off the net, she too was my first sail boat.not as detailed as the valdivia but she sails beutifully.
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sjoormen

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Re: Elco 77 : PT-41
« Reply #8 on: October 11, 2006, 06:48:23 am »

I hope that one day my modells will be that good :'(
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martno1fan

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Re: Elco 77 : PT-41
« Reply #9 on: October 10, 2006, 07:02:10 pm »

I hope that one day my modells will be that good :'(
dont we all?
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kikkari

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Re: Elco 77 : PT-41
« Reply #10 on: October 10, 2006, 10:17:36 pm »

Hi Pat,
Really enjoyed the sites.

Is there any more detail available on the Basic stamp work you did for the speed control?   Did you hit upon the ideal mix between throttle and rudder in the first go or did you need to go through some cycles before you felt you had it correct?  I think I see a serial programming lead in the picture, so I'm hoping you can share some experience of what works and what didn't work?


I'm in the middle of doing something similar but with a pic chip and would appreciate any any thoughts you may have.

Thanks



 
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Pat Matthews

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Re: Elco 77 : PT-41
« Reply #11 on: October 18, 2006, 11:39:59 pm »

Hi kikari-
Thanks, and sorry, been away...

I'm happy to say that it worked pretty well right off... the job was made much easier for me by being able to program in such a simple language (p-BASIC). I'm much happier with this than what I had with a certain mixer available commercially in the UK... that one attempts to vary the inner/outer speed in turns (NOT needed), and tended to go into counter-rotation when turning the wheel at slow ahead (BAD). Mine only c'rotates at zero throttle (with a little deadband). I limit the c'rotation speed to 50%.

So, just need to know the required pulse lengths to accomplish the job, graph out what you want, and write a few linear equations and tests to make it happen.

try me at patmat2350 at sbcglobal.net if you need more info.

Pat M




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Pat Matthews
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martno1fan

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Re: Elco 77 : PT-41
« Reply #12 on: October 19, 2006, 01:15:36 am »

sumat i said?? :(!! ::)
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kikkari

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Re: Elco 77 : PT-41
« Reply #13 on: October 24, 2006, 07:32:06 pm »

Thanks for that reply Pat,

Yes I'd agree that Basic has some big advantages, my day job steers me in the direction of C which of course has led to a little extra 'work'!

My idea is to use a third channel to vary the mix used; between immediate proportional reversing of the inboard motor, through braking the inboard motor, to no throttle effect on the inboard motor at all.  I also thought about running the outboard motors at 80% which will give me the possibility to increase the outboard motor by up to 20% to keep the boats speed up in the turns.  My speedo is going in a 1/400 scale plastic kit and I guess these small boats need help keeping their speed up in turns through the non scale water to help in some small way to keep the illusion of their massiveness.  I also planned to program some latency into the speed control to re-enforce the feeling of the inertia of a big ship.   

Having read your post I think that perhaps I'm a man gone overboard, your approach is more pragmatic and elegant...  hmmm, have to think!


(Huge respect for your project to motorise the King Tiger too!) 


Regards

Arthur

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OneBladeMissing

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Re: Elco 77 : PT-41
« Reply #14 on: November 13, 2006, 07:04:19 pm »

Superb!  Anyone who builds a model using the same construction method as the real thing has my utmost admiration.  I like the slipway cradle, it adds the finishing touch when the boat is on display.
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