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Scratch Build - 29" Balsa Stepped Cat

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Scratch Build - 29" Balsa Stepped Cat

Old 02-19-2008, 07:27 AM
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SV27dayton
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Default Scratch Build - 29" Balsa Stepped Cat

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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Old 02-21-2008, 10:30 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

Great Start

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

Ryan
Old 02-22-2008, 07:06 AM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

Thanks Ryan. Hopefully I'll start skinning it this weekend. I need to keep my momentum.
Old 02-22-2008, 12:00 PM
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thoese
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Default RE: Scratch Build - 29" Balsa Stepped Cat

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.
Old 02-22-2008, 12:07 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

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.
Old 02-22-2008, 02:24 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

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
Old 02-22-2008, 04:50 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

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.
Old 02-22-2008, 04:56 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

Looks good.
But Shockerman did not design this hull.
Old 02-23-2008, 11:21 AM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

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
Old 02-23-2008, 11:24 AM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

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
Old 02-23-2008, 12:09 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

Not accurate.

shockerman80 said:
Heres a link to the cat i designed. If theres enough interest ill post the info.
http://www.rcuniverse.com/forum/m_58...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:
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.
Old 02-23-2008, 12:27 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

i'm telling you what I was told.
Old 02-23-2008, 03:01 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

I hear you.
Old 02-23-2008, 04:56 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

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.
Old 02-23-2008, 10:37 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

Thanks for setting that strait. Hopefully mine will run 1/2 as good as yours.
Old 02-24-2008, 11:16 AM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

shockerman, i saw your vid and that thing sreams, lol. Nice. SV27dayton, hope yours turns out well too
Old 02-24-2008, 01:07 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

off to a goood start...
lets hope it dont leak
Old 02-26-2008, 09:24 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

any updates? Loving this build, it keeps me coming back to the forums.
Old 02-26-2008, 09:32 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

ours look the same
mine has been like this for a while. to lazy to finish it, don't know what to do with it

Old 02-26-2008, 10:38 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

They do look the same. Yours was cut with a laser and mine with a scalpel. That would have been faster. I'd have tried to cut it on our abrasive waterjet but as you know I only have the prints. Did you get that from Shock? Did you widen the tunnel on yours? I bought some additional supplies this weekend, but no progress as of yet. I'd say I think about it for at least 1/2 hr a day but no action right now.
Old 02-27-2008, 08:20 AM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

no i did it my self. its not hard when you are good at cad.
i did widen the tunnel and did a bit of changes to the sponons
Old 02-27-2008, 11:26 AM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

you are good at everything.
Old 02-27-2008, 11:39 AM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

No he's not, too much food for his ego.

What's your next planned step for this build?

Ryan
Old 02-27-2008, 01:41 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat

Ryan,
Watch me for a while. I'm very sarcastic. If wasn't large I'd likely be dead.

Next "step" no pun intended is to put a 1/32 skin of balsa over the all the bottom surfaces. I plan to start with the tunnel and then the bottoms of the sponsons followed by the sides. Then I'll urathane the interior, add foam and then do the top. Then repeat with 1/64 ply, and urathane the outside. Im not sure how I'm going to bond the ply to the balsa but I'm going to try to cross the grain as much as possible to increase the stregnth.
Old 02-27-2008, 03:19 PM
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Default RE: Scratch Build - 29" Balsa Stepped Cat


ORIGINAL: Taylor Shaw

ours look the same
mine has been like this for a while. to lazy to finish it, don't know what to do with it

I knwo what you could do with it, Sell it or give it too me!!!!! LMK, that would be great. If you dont, im building one soon so it should be sweet

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