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my First scratch build

Old 06-28-2010, 03:06 PM
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08gtrking
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Default my First scratch build

First off i want to say thanks to MaxCorvette for the plans and SV27dayton, KD0EM,and everyone else i left out for the help.I have just finished cutting all the balsa wood its 1/8 inch the boats length is 36inches and im not sure what to do next before i epoxy the stringers together.
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Old 06-28-2010, 03:11 PM
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redfisher1974
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Default RE: my First scratch build

What do you use to cut it out?
Old 06-28-2010, 03:12 PM
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08gtrking
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Default RE: my First scratch build

X-acto Knife

Old 06-28-2010, 03:21 PM
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redfisher1974
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Default RE: my First scratch build

Really, It looks so perfect. Great job so far[sm=thumbup.gif]
Old 06-28-2010, 03:24 PM
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08gtrking
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Default RE: my First scratch build

Trust me it`s not perfect
Old 06-28-2010, 06:21 PM
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tkopper
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Default RE: my First scratch build

Hey king, I am building my first boat out of balsa as well. I just about finished drawing the plans for it and thought how I am going to water proof the balsa wood (which is the whole hull). Got any ideas?, Thanks, Tom.
Old 06-28-2010, 07:27 PM
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08gtrking
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Default RE: my First scratch build

I was thinking waterbased urathane the interior and outside. im not 100 % sure if that will water proof it so ask some more people see what they tell you.
Old 06-28-2010, 08:15 PM
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SV27dayton
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Default RE: my First scratch build

I cut mine the same way. Hopefully it will fit together tightly. I glued mine together with CA. Once the whole frame is assembled this way it's pretty rigid. Then you can add the first layer of skin to the bottom. Once you have all but the top on it you can use the urathane to WP the inside. I believe this adds rigity to it the framing as well. In most places it forms a radius in the corners. I didn't WP the inside of the top skin of mine so I do have some concerns that it will "age" as some point. It doesn't get much water in it and I let it dry thorughly so ...so far so good. If I were you I'd consider coating the tops skin b4 applying it so you don't have to worry. How long and what power? Don't worry if you dont' konw. I didn't.
Old 06-29-2010, 12:39 PM
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08gtrking
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Default RE: my First scratch build

So i have epoxyed the two stringers together im waiting for it to dry so i can put the last one as you can see in the photo there are 3.
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Old 06-29-2010, 12:57 PM
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SV27dayton
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Default RE: my First scratch build

I know this will shake things up for you but when I was building mine I was told to widen the tunnel. This was easy for me b/c my tunnel is flat. I simply cut the print and added a one inch extention in my case and cut them as such. your boat looks really long and skinny. Can you give us the legnth and beam. I'll look back and see what mine is by comparison. Reason I say this is I think they are a bit more stable when the sponsons are farther apart. I'm very happy with mine but the plase it gets out of control sometime is turning at speed. It will prop walk and slide and if it catches a roller it'll roll. I'm sure this would be worse if it were narrower.

From page 4 of my build......
my boat is:
29.75 from tip to tail, but only 27.5 from the transom where the hardware will mount.
10.25 inches wide
tunnel is just a hair under 5 inches wide and 3/4 deep
Total height without any canopy is about 3"

Read more: http://www.rcuniverse.com/forum/m_71...#ixzz0sGarUEzj
Old 06-29-2010, 01:19 PM
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08gtrking
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Default RE: my First scratch build

The tunnel is 4and1/2inches wideand its round.
Old 06-29-2010, 02:07 PM
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SV27dayton
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Default RE: my First scratch build

I saw that. Intresting. I'm not sure if there is an advantage, it iwll probably be more rigid than mine, but mounting hardware will be more difficult. 4.5 by comparison is pretty narrow for a three foot boat. May be a great straight-away boat. What do you plan to push it with?
Old 06-29-2010, 02:19 PM
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08gtrking
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Default RE: my First scratch build

I was thinking Turnigy 180A Brushless ESC on 5s with KB45-11XL 1000kv Brushless Inrunner i don`t know if that combination will work but the minimum speed people run in the club im in is 60mph and there all gas so i am going to need some help with the setup or any other suggestions
Old 06-29-2010, 10:06 PM
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SV27dayton
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Default RE: my First scratch build

They have a minimum speed? Find a new club. You'll probably want to put 2 of those in there if you want to make it to 60. I don't knwo that 5S will get you there
Old 06-29-2010, 10:55 PM
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Default RE: my First scratch build

G8ter: I really enjoyed looking at your cat design! You have an in-depth knowledge of boat design, that's for sure! The lines are beautiful and looks like it'll do it's job admirably. How did you locate the cavitation breaks; is there a ratio that you used to position them? Looking forward to what happens next! Have fun!
Will
Old 06-30-2010, 01:40 PM
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08gtrking
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Default RE: my First scratch build

They don`t have a minimum speed it`s just if i want to be abile to catch up to them the minimum speed would have to be 60mph. Cause what they most of them run modded Zenoah motors.
Old 06-30-2010, 01:42 PM
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08gtrking
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Default RE: my First scratch build

Thank you i didn't`t design this cat if that what you mean.I just sand the wood till it`s even.
Old 07-01-2010, 05:25 PM
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08gtrking
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Default RE: my First scratch build

Well i have just finished epoxing the last part to go on the stringer on one now i have to wait to do the other one.
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Old 07-09-2010, 12:52 PM
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08gtrking
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Default RE: my First scratch build

Sorry guys this whole week i haven`t been home so today i started of were i finished which was on laminated the stringers together but i ran into a problem which SV27dayton was right about.the tunnel is going to be way to small .So what i was thing was cutting the part if the tunnel on the wood and glueing the other part on the stringers like the first 2(pic)and cutting the tunnel were the pen is at in the picture and make a nother one thats bigger .Tell me what u guys think and Any advice is welcome.
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Old 07-09-2010, 02:43 PM
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Default RE: my First scratch build


ORIGINAL: 08gtrking

I was thinking waterbased urathane the interior and outside. im not 100 % sure if that will water proof it so ask some more people see what they tell you.
WB Polyurethane is water proof once cured, it even stand methanol and low nitro quite well. The best about it is almost no smell and being able to clean your brushes with warm water. Like all varnishes it is sensible to long UV exposure.
Old 07-09-2010, 05:36 PM
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08gtrking
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Default RE: my First scratch build

I don`t know if there is a righ or rong answer but which is better a rounded tunnel or flat?
Old 07-09-2010, 10:40 PM
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SV27dayton
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Default RE: my First scratch build

I think I get what you are saying. It should work. I assume you want to do this to avoid re cutting all your cross members. Just take your time and do it right. As for the round or flat, I can't say. I've seen real boats with both. As for RC the benefits of round is more rigid (might look cool too). Flat is easy to skin and easy to mount your hardware in. As far as I can tell it works too. My 29 skates on the slightest breeze. What made you decide that it was too narrow? just looking at it assembled? I know I assembled mine ever after adding an inch I still thought it could have used another 1/2 inch. It's good but it's biggest negative tendency is wanting to roll in a turn at full bore. That's one thing that I've learned is that you'd better build an RC boat to turn, especially a fast one because you do it alot (because you are standing on the shore) there's no such thing as a leasurly cruise.
Old 07-09-2010, 10:45 PM
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Default RE: my First scratch build

For motors you should run twin 9XL on 6S lipo each. Those would probaly smoke the Gassers
Old 07-10-2010, 10:35 AM
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08gtrking
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Default RE: my First scratch build

The stingers looked way to close together.Yesi don`t want to recut all of it agian because i don`t have enough wood to do all of them and the drive to the lhs is a 45 min drive. So the reason i ask if rounded or flat tunnel is better because it would be easyer to cut out a flat one than a rounded one and more chance of me getting it cut out right the first time.
Old 07-10-2010, 01:52 PM
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SV27dayton
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Default RE: my First scratch build

All I can tell you is flat works very well.

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