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Old Jan 16, 2011, 10:45 PM
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Build Log
Offshore CAT 34

Hello Guys,

I had already started a build log for this project but thought that the thread needed a more appropriate name, an official name....so I am uploading the same photos from the previous thread and adding some new ones from this evenings fun time. I am skinning this with 1/32" ply and then will fiberglass the whole boat top/bottom.

Power: Planned single motor set up( Castle 1717, or Leopard 4074???, probably 6s, and 180amp ESC based on some input from you guys!. Don't know anything about props or hardware so I will be looking for advise later on that stuff too.

I do want to thank those of you who have given me great info so far!

After skinning, the next big issue is the hatch. I am planning on maybe getting a RIO EP hatch and retro fitting it for the CAT cockpit look...or I may mold one.

I don't know anything about placement of COG...is there a rule of thumb?
Thanks again,
Brian
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Old Jan 16, 2011, 10:53 PM
I feel the need for speed!
scorpion1's Avatar
Southern U.S.
Joined Jun 2008
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My vote is still for the Leopard 4082 1500kv on 6s....................it would rock!

http://www.offshoreelectrics.com/pro...?prod=leo-4082
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Old Jan 16, 2011, 10:59 PM
I feel the need for speed!
scorpion1's Avatar
Southern U.S.
Joined Jun 2008
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Oh, and here's basically the same motor with a different can, 4 pole and all.....$62.......save ya some $$

http://toyabipro.com/product_338.html
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Old Jan 16, 2011, 11:19 PM
Memento Mori
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United States, NC, Charlotte
Joined Sep 2009
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4082 would work. Might look for a esc switch if you wanna run 6s. I love my Seaking 180's but I never run esc's to their max voltage many have had good luck many have not, I don't chance it. I would run a Swordfish 240HV. http://www.offshoreelectrics.com/pro...ef-sword-240hv. I think a 1717 would be kinda big for a 34" cat. Maybe a 1518 or 1520 if you could find one which maybe hard to do. I planned on running a 1518 in a 32" cat. What's the beam on that hull? Very nice by the way. Reason I ask if it's a narrow hull, a big prop may create a lot of prop walk. What also do you want out of this hull, race setup, sport boating setup or SAW style setup? That will also help determine what motor kv & props to look at.
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Old Jan 16, 2011, 11:26 PM
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Hey Guys,

Like I said before, I am a sailor and this power stuff is new to me...

The beam is 11", and I would like it to be fast but not so fast I can only run it in calm water....if you know what I mean? Won't be racing it unless I can fin d a local club to race with...

B
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Old Jan 17, 2011, 12:14 AM
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COG is pretty much the same as for monos, around 30% of length, measured from transom. Just from playing, not racing, I found this hull happier on 35-37%, and I was doing around 50mph.
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Old Jan 17, 2011, 11:27 AM
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I thought about the question last night...."What do I want from this boat?" Well I would like it to be fast enough that I Can't drive around full throttle. If that makes any sense...?

B
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Old Jan 17, 2011, 01:30 PM
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Then go for the 4082... plenty of power, should get you close to 60 and more, just keep it light.
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Old Jan 17, 2011, 01:52 PM
Memento Mori
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United States, NC, Charlotte
Joined Sep 2009
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Well driving a boat NOT at full throttle is never a good idea. The esc will heat up very quickly. The esc likes to be either off (sitting still) or on (full throttle), when you run less then full the throttle the esc cycles on/off real fast to meet your request that on/off switching increases heat dramatically. Sound like a motor that can handle different voltage to meet your needs would be best. In that case I would recommend the leopard 4074 1774kv. In that motor you can run 4s and have good speed but still under control. When you feel more comfortable you can increase the voltage to 5s and still be safe. If you feel real crazy and want some saw style passes you can run 6s (only for a few passes). Hull seems pretty good size so that 1774 on a x447 should be a nice setup on 4s. With increase in voltage I would decrease prop size. 5s maybe a m445, stay away from 6s until you have a better understanding of FE boating. All of this is JMO of course. Yea COG should be 28%-30%, i normally settle in the middle around 29%...


Here is my 29" cat on a leopard 4074 1774kv. Motor has a crazy scream too it. With your cat and that motor I would recommend the seaking 180 so you have some more head room and a more forgiving setup for 4s/5s. This was on a CF48 prop first run and hit 47mph. I now have a x447/3 on the boat which I haven't had a chance to run yet due to weather.

http://www.youtube.com/watch?v=spPr80I-kpA
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Last edited by Diesel6401; Jan 17, 2011 at 01:58 PM.
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Old Jan 17, 2011, 04:09 PM
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Thanks! Sounds like good info...I will take notes for sure.

I will be working again tonight on the hull bottoms and skinning the sides of the hulls. Will post pics soon!

B
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Old Jan 17, 2011, 11:06 PM
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Latest Progress....

Skinned the sides of the hulls tonight as well as added some outer strakes and some ride pads....let me know what you think? I only got one side tonight.

B
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Old Jan 19, 2011, 08:58 AM
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Hey Guys!

Finished the hull mods last night...I still have some tweaking to do but for the most part I am happy with the result.

What is a good sealer for the inside of the hull? I was thinking thinned epoxy...any better less messy solutions?

Brian
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Old Jan 19, 2011, 08:59 AM
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Forgot the PICS
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Old Jan 19, 2011, 09:01 AM
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Thinned epoxy works well or even polyester (fiberglass) resin. You could also use minwax clear poly u. I've used it a lot on model planes for a clear top coat and it's a pretty tough finish.
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Old Jan 19, 2011, 09:07 AM
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Quote:
Originally Posted by RG-sailor View Post
Forgot the PICS
Hey bud,youve done a real nice job,but i think you need to extend the front ride pads further toward the tips,not ll the way ,i think they you may have problems else.
Just my observations,but good job anyways
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