Apr 10, 2007, 11:19 PM
KC8WPF
Euclid, Ohio, United States
Joined Sep 2004
4,334 Posts
Quote:
 Originally Posted by rlboats2003 Bob's is not a lindberg kit, his has a scratch built hull.
Rich is right, my PT-188 is scratch built. BUT - the models built to scale should all weigh about the same; whether it's my scratch built one or the Lindberg plastic kit. The 1943 series 80' Elco PT displaced 51 tons, which converts to 3.5 pounds for a 1:32 scale model. The 1945 series 80' Elco's displaced 61 tons, which converts to a scale weight of 4.2 lbs. We can scale down the size and mass of our models, we can't scale down the water.

For anyone who slept during math class, here's the scale weight formula:

Full size ship displacement in tons X 2240 lbs in a long ton divided by the cube of the scale.

For the 1:32 scale Elco 80' PT's it works out like this:
51x2240/32768 = 3.5 lbs (1.58 kg)
61x2240/32768 = 4.2 lbs (1.9 kg)

The 1943 series had a top speed of 43 knots, converted for scale wake makes the speed 7.6 mph (12.23 kmh). The 1945 series top speed of 41 knots converts to 7.2 mph (11.58 kmh) for scale wake. The model's speed over ground will be faster than scale speed, but the wake will be scale in appearance because we can't scale down water.
Last edited by CG Bob; Apr 10, 2007 at 11:27 PM.
 Apr 11, 2007, 01:44 AM Taking care of the pond. United States, CA, Sanger Joined Apr 2004 7,775 Posts Great pictures Umi. Thanks
 May 17, 2007, 12:40 PM Is life for real? Almere The Netherlands Joined Sep 2006 1,324 Posts Stephen, I've tried using AA's on my PT but it doesn't work. I believe this is because the continuous supplied current is too low on AA's compared to sub C's. I've just ordered some NiMh's 4200mAh's at 70A continuous. How's the built going?
 May 17, 2007, 02:30 PM Registered User Swieqi Malta Joined Nov 2005 269 Posts Hi pKboo It’s been a while since I last laid my hands back on this project. I've been waiting for some parts and they arrived today. Bad new about the AA's not giving you a good result. What motors are you using? I'd love to know Stephen
 May 18, 2007, 06:30 AM Is life for real? Almere The Netherlands Joined Sep 2006 1,324 Posts Hi Stephen, I have a multiplex600 in my PT which should get between 15.000 to 19.000 rpm's at 9,6V. The props (3x32mm/35mm/37mm) are driven thru a 1:2.5 gearbox. It don't mather which size prop I use, the motor does not get the juice and even shuts down (like the battery is low on current). I don't have this problem with the Sub C's. I got GP's 2700NiMh's which I'm now putting in the Tx of one of my Fletcher DD's (next project). Which parts were you waiting for? Already started on the paint job? Be good Eugène
 May 18, 2007, 07:12 AM Lipoly Killer Gulfport/Biloxi Biloxi Reg, Mississippi, United States Joined Dec 2000 1,659 Posts Hi, Stephen! Absolutely marvelous pictures! Thank you so much for sharing! Frank
May 18, 2007, 02:03 PM
Registered User
Swieqi Malta
Joined Nov 2005
269 Posts
Quote:
 Originally Posted by pkboo Hi Stephen, I have a multiplex600 in my PT which should get between 15.000 to 19.000 rpm's at 9,6V. The props (3x32mm/35mm/37mm) are driven thru a 1:2.5 gearbox. It don't mather which size prop I use, the motor does not get the juice and even shuts down (like the battery is low on current). I don't have this problem with the Sub C's. I got GP's 2700NiMh's which I'm now putting in the Tx of one of my Fletcher DD's (next project). Which parts were you waiting for? Already started on the paint job? Be good Eugène
Hi Eugène

Your motors are juicy motors, only sud C cells will deliver that kind of juice.
According to the chap from whom I purchase my 385 motors they only consume 1A at 12v with a 30mm prop. Therefore I now hope hat my AA batt's will work well.

I was waiting for my speed controller, brass motor inserts, servo box (because I sold the one I had to a friend). I am hoping to start again so as to finish my project shortly.

Anyway I will always keep you updated with wants new.

Thanks

Stephen
 Jul 31, 2007, 12:06 PM Registered User Swieqi Malta Joined Nov 2005 269 Posts Hello Just added a few more pic showing final stages of my build. I've done a test drive and the boat really cruises well. Soon I will start painting! that will be an interesting part of this project ZEBRA CAMO Stephen
Aug 19, 2007, 12:26 PM
Registered User
Swieqi Malta
Joined Nov 2005
269 Posts
Got cracking on my project once again, it must be ready for annual exhibition soon

Hi Guys

Spent the day doing some paint work on my PT boat, finished fabricating a cradle for my boat too, look's cool what do you think?

Hope you enjoy the pictures

Stephen

# Images

 Aug 19, 2007, 05:33 PM Grumpa Tom United States, CA, Los Angeles Joined Sep 2003 25,744 Posts That is quite an interesting livery. It does look good. What navy would that be from?
 Aug 20, 2007, 05:33 AM Is life for real? Almere The Netherlands Joined Sep 2006 1,324 Posts Nice work on the cradle Stephen, yeah curious on what colours you´re finishing up with
Aug 20, 2007, 05:50 AM
Registered User
Swieqi Malta
Joined Nov 2005
269 Posts
Quote:
 Originally Posted by pkboo Nice work on the cradle Stephen, yeah curious on what colours you´re finishing up with
kmot and pKboo , I am using RAL colours and I hope I am getting them right, remember I am going to apply the ZEBRA camo soon, my reference pictures are black and white. Not much help I’m afraid.

Stephen
 Aug 20, 2007, 08:53 AM Is life for real? Almere The Netherlands Joined Sep 2006 1,324 Posts Of course it was that white animal with black stripes OR was it black with white stripes Eugène
 Aug 21, 2007, 12:51 AM Taking care of the pond. United States, CA, Sanger Joined Apr 2004 7,775 Posts White with black stripes, I think.
Aug 26, 2007, 01:32 AM
Registered User
Swieqi Malta
Joined Nov 2005
269 Posts
Hi catch a glimpse of my ZEBRA CAMOUFLAGE

Hi all

Yesterday my 1st attempt at painting my torpedo tube in Zebra Camo, What do you think?

Stephen