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« on: January 12, 2015, 06:03:05 AM »
Dodgy Geezer
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We have a new boat plan out - an Elco 80ft PT Boat.

Free download from here: http://eezebilt.co.vu/PTBoat.html

Happy building!

DG
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« Reply #1 on: January 12, 2015, 12:01:09 PM »
VC
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L'enfant Terrible du RCIndia



 Bow I mean like WOW!!!  Hats Off
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« Reply #2 on: January 13, 2015, 02:29:28 AM »
Dodgy Geezer
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I know how you like to add accessories to your boats - this one offers almost limitless possibilities...  Drool
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« Reply #3 on: January 18, 2015, 10:35:09 PM »
gaurang.1972
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Very good dg sir
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« Reply #4 on: March 28, 2015, 04:21:25 PM »
Dodgy Geezer
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Here are a few pictures of a completed one...


th-1550.jpg
Re: New free EeZeBilt 50+ plan out...
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« Reply #5 on: March 28, 2015, 04:26:19 PM »
rcrcnitesh
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Wow, superb build.
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« Reply #6 on: June 05, 2015, 07:44:20 PM »
Dodgy Geezer
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...and a (poor phone quality) shot of one running...


th-Running 4.jpg
Re: New free EeZeBilt 50+ plan out...
* th-Running 4.jpg (36.21 KB, 480x360 - viewed 1078 times.)
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« Reply #7 on: June 05, 2015, 08:35:54 PM »
ashok baijal
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Nice build.

Can you please give details of the power setup viz., the motor specs, the prop size and drive shaft.
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« Reply #8 on: June 06, 2015, 03:58:37 PM »
Dodgy Geezer
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I wanted a good turn of speed, so I thought I would use a brushless motor.

One of the design requirements for EeZeBilts is low cost, so I used the cheapest ones I could find in the UK - typically buying them on Ebay with a matching ESC for around GBP10. They will be a bit more in India  Sad   I have two PT-Boat prototypes, and used an EMax CF2822 in one, and a Tower 2410-12T-3 (delta) in the other. You can look them up on the net - I think they are each around 1200KV.  Any outrunner brushless with a KV of about 1000 and an external diameter of 28mm or more should be fine.


All the pictures show a NiMh pack of 6 cells - 7.2V, though I have just made up an 8 cell 9.6v!

Probably the most important thing is the prop. Annoyingly, I didn't leave much room under the back of the boat, and I am using a 2mm shaft, so there was very little choice of propeller. I ended up taking a RadioActive (UK Seller) 3-blade 40mm prop, and sanding it down so that it just fitted, which made it about 33mm. This shifted a good bit of water and gave a good lively turn of speed.  I make up my own drive shafts - this  is about 9" long...
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« Reply #9 on: June 06, 2015, 09:03:00 PM »
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That's one Dodgy Geese ! Thumbs Up

Is she tad low rear hull ? just asking
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« Reply #10 on: June 06, 2015, 09:29:56 PM »
Dodgy Geezer
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Indeed, she is low at the rear at speed - that is scale behaviour and seems to match the prototype.

The PT-Boat has a wide bow, but it tapers off to a very narrow stern - see the planform below. I think the idea was to cut down on the wetted area as the boat picked up speed. So at speed the small stern sits quite low. If you look at typical sit of a PT-Boat in wartime photos going at speed you will see the same bow-up, stern down attitude. I was actually quite happy that the model matched the full-size in this respect. And when I ran slow, the bow came right down again...

http://en.wikipedia.org/wiki/PT_boat

PT593-1.jpg
Re: New free EeZeBilt 50+ plan out...
* PT593-1.jpg (55.26 KB, 800x416 - viewed 1159 times.)
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« Reply #11 on: June 06, 2015, 09:44:03 PM »
K K Iyer
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Dod Ji,
Good stuff. Keep it coming.
(Ji is an honorific in India, same as Sir)
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« Reply #12 on: June 07, 2015, 03:15:01 PM »
ashok baijal
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Thanks for the info. Thinking of building one.
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« Reply #13 on: June 07, 2015, 07:52:29 PM »
Dodgy Geezer
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Pretty much any motor/prop/battery combination can be used on the boat, though for speed you obviously want a bit of power.

The reason is that the boat is so light. The basic hull is around 10oz - less than 300 gm. I have sailed it with 7.2v AA batteries at an all up weight of 22 oz - around 600gm, and 7.2v C size batteries at 28oz (800 gm).
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« Reply #14 on: June 07, 2015, 11:22:32 PM »
Dodgy Geezer
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Sorry - double submission - mods please delete...
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