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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!!
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!
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!😁
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
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
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.
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
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!
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
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?
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
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.
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
22nd Aug 2018 02:41
