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>> Home > Forum > Boat Specific Chit Chat! > PT 109 upgrade?
PT 109 upgrade?
(523 views)
Author Message
masterfixer
(Seaman)





Forum Posts: 4
22nd Aug 2018 02:41  
>> Permalink
mdlbt.com/45323

Hello everyone. I have recently completed a lovely Dumas PT109 which I began almost 30 years ago. I finally had time to complete the superstrucure! I really enjoyed the finished boat! The problem is that the old motors (3) make much too much noise and draw too much power.
I would appreciate advice on installing the most prototypical, and quiet "engine room" as I have also installed a very nice modelsoundsinc 3 diesel engine sound! Cheers!!

Westquay
(Fleet Admiral!)





Forum Posts: 674
22nd Aug 2018 13:32  
>> Permalink
mdlbt.com/45325

Should be three V12 petrol engines for PT109, surely?

I always find pseudo sound to be most unconvincing. I like a bit of genuine racket in a model! My Crash Tender has a Taycol Supermarine with a Taycol square peg coupling, now that's NOISE!

Cheers,
Martin

masterfixer
(Seaman)





Forum Posts: 4
22nd Aug 2018 13:40  
>> Permalink
mdlbt.com/45327

I stand corrected!!😲
However I still want to improve performance. I thing I may want geared drives but I don't really know where to start.
btw...this is my first post ever, so, Please be nice!😁

RNinMunich
(Fleet Admiral!)





Forum Posts: 2212
22nd Aug 2018 13:45  
>> Permalink
mdlbt.com/45328

Correct Martin, three 12-cylinder 1,500 horsepower (1,100 kW) Packard gasoline engines!
Diesels (especially digital diesels) will sound ALL WRONG!
Something like 3 Marine Merlins might get close😉 Maybe there's a sound bite for those somewhere!?
Diesels were never used for such boats as they would have been too noisy (rattly!) for the 'Whisper' mode, even with exhaust muffler flaps closed.
Masterfixer: what size / weight is your boat?
The 33" or 40" version?
What motors are in it now?
Cheers, Doug 😎


Young at heart - slightly older in other places 😉 Cheers Doug
Grant me the Serenity to accept things I can't change,
the Courage to change things that I can, and
the Wisdom to know the difference!
masterfixer
(Seaman)





Forum Posts: 4
22nd Aug 2018 14:12  
>> Permalink
mdlbt.com/45332

Hi. She is 48 inches long and the motors are old inexpensive brushed can motors (no name). Thanks, Ira

masterfixer
(Seaman)





Forum Posts: 4
22nd Aug 2018 14:53  
>> Permalink
mdlbt.com/45333

btw I already have a couple of 30Cseries 8000 11.1v batteries I'd like to use!😁

RNinMunich
(Fleet Admiral!)





Forum Posts: 2212
22nd Aug 2018 15:00  
>> Permalink
mdlbt.com/45334

Hi Ira,
Aha! the 1/20 version. So she has some carrying capacity👍
Here's a recommendation from RC Groups-
"I have a 1/20th Elco hull based on a John Drain keel and bulkhead kit from Australia. It is powered by three 3548 770KV outrunners turning 1 1/2" three blade props, three separate ESC's, and three 3500mah 4 cell LiPo battery's. Running weight is 16 lbs., capable of speed far in excess of scale, run time is great. "
Sounds good to me!
For reference; I have a 28" version, being renovated and upgraded. It has 2x 2832 brushless driving 3 blade 35mm props. Guy I bought it from said it was too fast for him! I'm considering adding an independent centre motor, a simple brushed job for slow cruising / manoeuvring.
So the above seems reasonable for a 4footer of 16lb.
Cheers, Doug 😎


Young at heart - slightly older in other places 😉 Cheers Doug
Grant me the Serenity to accept things I can't change,
the Courage to change things that I can, and
the Wisdom to know the difference!
Westquay
(Fleet Admiral!)





Forum Posts: 674
22nd Aug 2018 17:16  
>> Permalink
mdlbt.com/45340

Only multi V 12 installation in a boat I know is the twin Packards in the huge commuter Thunderbird on Lake Tahoe. There is video with sound of her running on the tube. But 3 Packards tergither? Doubtful.

Martin

RNinMunich
(Fleet Admiral!)





Forum Posts: 2212
22nd Aug 2018 17:39  
>> Permalink
mdlbt.com/45341

Doubt away Ol' chap, but that's what the Elco 80s had.
Not surprised you don't know them though - they've got guns 😲
so not your thing are they.
Cheers, Doug 😎


Young at heart - slightly older in other places 😉 Cheers Doug
Grant me the Serenity to accept things I can't change,
the Courage to change things that I can, and
the Wisdom to know the difference!
Westquay
(Fleet Admiral!)





Forum Posts: 674
22nd Aug 2018 18:37  
>> Permalink
mdlbt.com/45343

No, no, you misunderstand, Doug. Not doubting the engines in an Elco, but doubting the likelihood of finding a youtube of one with it's original power of 3 V-12s to record for a sound unit!

Martin

RNinMunich
(Fleet Admiral!)





Forum Posts: 2212
22nd Aug 2018 18:44  
>> Permalink
mdlbt.com/45344

Aha! Agreed, although I believe there is one restored and sea worthy in the states!? But that's not at all what you wrote; brain ahead of fingers again.
Know the feeling. No matter,
Back to the LEDS 🤔
Ciao Doug 😎


Young at heart - slightly older in other places 😉 Cheers Doug
Grant me the Serenity to accept things I can't change,
the Courage to change things that I can, and
the Wisdom to know the difference!
Westquay
(Fleet Admiral!)





Forum Posts: 674
22nd Aug 2018 20:20  
>> Permalink
mdlbt.com/45345

It wouldn't surprise me to find there was one with original power in the States. Not something we do here, of course. Oh nonononono, might be expensive, all that petrol, what?

Cheers,
Martin

RNinMunich
(Fleet Admiral!)





Forum Posts: 2212
22nd Aug 2018 22:58  
>> Permalink
mdlbt.com/45349

Probably sponsored by the oil corporations Martin 😉

BTW: how do you like my 'Southampton' Christmas Tree? 😁
Cheers, Doug


Attached Files - Click To View Large


Young at heart - slightly older in other places 😉 Cheers Doug
Grant me the Serenity to accept things I can't change,
the Courage to change things that I can, and
the Wisdom to know the difference!
Westquay
(Fleet Admiral!)





Forum Posts: 674
23rd Aug 2018 08:29  
>> Permalink
mdlbt.com/45357

Very nice, Doug. It'll come in handy next time you're surprised at the lake by a sudden eclipse.

Martin

camyaj
(Chief Petty Officer)





Forum Posts: 23
23rd Aug 2018 12:36  
>> Permalink
mdlbt.com/45361

My 1/24th Schnellboot 5' was running on 3x850 mfa motors changed to 1 x Turnigy 3648 1450kv outrunner operating on a 3s lipo.
. more than enough speed even with the outer props just freewheeling

bubbletop409
(Apprentice)





Forum Posts: 1
16th Sep 2018 05:30  
>> Permalink
mdlbt.com/46233

When choosing brushless motors the KV rating is an important part of the equation. A high KV rating will make slow speed operation difficult in a scale boat.

RNinMunich
(Fleet Admiral!)





Forum Posts: 2212
16th Sep 2018 12:23  
>> Permalink
mdlbt.com/46244

Not necessarily Bubble,
By correctly programming the ESC for a soft start and a not too aggressive acceleration curve you can tame brushless at low speed and stop 'em leaping ahead like scalded cats! Worked fine on my Sea Scout upgrade.
Even adjusting the motor timing can help with the fine tuning.
Cheers, Doug 😎


Young at heart - slightly older in other places 😉 Cheers Doug
Grant me the Serenity to accept things I can't change,
the Courage to change things that I can, and
the Wisdom to know the difference!