Scratch Build - 29" Balsa Stepped Cat

Scratch Build - 29" Balsa Stepped Cat
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Scratch Build - 29" Balsa Stepped Cat - 2/19/2008 12:27:32 PM

SV27dayton

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From: Centerville, OH, USA
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Well since everyones complaining that the forum is dead, I figured I'd begin posting on my current (1st) build project. I saw a post here about a year ago about a balsa cat and couldn't forget about it. "Shockerman" designed the original one based on picture of a full sized Callan Marine boat. There's a great build thread on RRR. Ive increased the size from 26 to 29 inches, full scale and then added about another inch to the width of the tunnel. The boat will be about 29" without the running hardware. Right now I plan on skinning it like he did with 1/32 balsa under 1/64 ply and then coating it with urathane. Power will come from a 9XL through a hydra 120 to a standard flex drive and either fullers or SM hardware. I'll start testing on 12 cells with likely a 637. I'm thinking of making some changes and puttin the rudder on a pylon further back and directly behind the prop. Any advice or feedback is welcome.

Word of warning I have a lot of other things on my plate so this one will require some patience for all of us.

Dayton

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/22/2008 3:30:45 AM

ryan_t888

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Great Start

Let's bring this back to the top as I would love to see more.

Ryan

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/22/2008 12:06:25 PM

SV27dayton

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From: Centerville, OH, USA
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Thanks Ryan. Hopefully I'll start skinning it this weekend. I need to keep my momentum.

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/22/2008 5:00:10 PM

thoese

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Joined: 2/22/2008
From: , MI, USA
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Hi I'm interested in seeing how you build your boat from balsa. I'm thinking of building a hull from scratch but I've never done that. My prior boat was a RTR model that I modified.

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/22/2008 5:07:40 PM

SV27dayton

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From: Centerville, OH, USA
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Same here, how hard can it be?

. I'll tell you what I did but I won't garuntee that it's the best way. I think it's all a matter of stregnth vs. weight, but I have a feeling that this boat will be strong and light by comparison any way I do it. The question is to I want to copromise weight for stregnth or stregnth for weight? I think I'll go farily conservative and keep it pretty stout. I still need to do some research before I apply the second layer of wood.

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/22/2008 7:24:56 PM

ryan_t888

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quote:

ORIGINAL:

Thanks Ryan. Hopefully I'll start skinning it this weekend. I need to keep my momentum.

I know what you mean. I'm in the beginning and middle of three builds and find it hard to keep building.

If you believe you may use LiPo or even a more powerful motor in the future I would recommend building strong vs keeping it light. It's much easier to over power a boat in the future vs swim for the pieces after a blow over.

Ryan

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/22/2008 9:50:06 PM

SV27dayton

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I've seen the only working prototype of this boat blow over going fast and it came back to shore under it's own power. The builder claims the hull is very rigid. It'll be full of foam too. I'm going home to work on it.

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/22/2008 9:56:46 PM

CadillacETC2000

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Looks good.
But Shockerman did not design this hull.

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/23/2008 4:21:07 PM

SV27dayton

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OK then who did? He said he caded it from photos of a full size Callan. Do you credit the cad guy, the original designer of the full size or the photographer?

Do you know something I dont?

PM

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/23/2008 4:24:57 PM

CadillacETC2000

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i recall him saying that it was not him. it was a german fellow. I have his email as well. Just forget which it is.
I remember when i wanted the plans a while back he said sure but didnt want to give alot out because they were not his

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/23/2008 5:09:29 PM

SV27dayton

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Not accurate.

shockerman80 said:

quote:

Heres a link to the cat i designed. If theres enough interest ill post the info.

http://www.rcuniverse.com/forum/m_5891948/anchors_5891948/mpage_1/key_brushless%252Cwheelie%252Cmachine/anchor/tm.htm#5891948

He was a little hesitant to send out the design until he got it running good. He sent them to me but not the autocad, just an adobe file. I don't recall any germans involved. He sent the plans to a ton of people but I haven't seen a build yet.

another quote from shockerman80 the RR forum:

quote:

Yes i did all the cad drawings first then built it. I am a cad teacher and the drawings are pretty close or my building skills are a little off so i have to make some minor changes to them. I honestly drew the boat off some pictures of the callan marine boat with some rc specific changes. I still consider the boat my own design though. Im not going to send out the drawings till i run it. i dont want anyone else to build it if it has any major mistakes such as bad handling characteristics.

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/23/2008 5:27:27 PM

CadillacETC2000

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i'm telling you what I was told.

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/23/2008 8:01:49 PM

SV27dayton

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I hear you.

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/23/2008 9:56:50 PM

shockerman80

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From: buffalo, NY, USA
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i did design this hull. there was another hull that i built that i did not design. the 26" balsa cat was completely my own design It took me almost 2 months to design it.

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RE: Scratch Build - 29" Balsa Stepped Cat - 2/24/2008 3:37:33 AM

SV27dayton

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From: Centerville, OH, USA
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Thanks for setting that strait. Hopefully mine will run 1/2 as good as yours.

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