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My scratchbuilt v-hull

Old 07-30-2007, 01:13 PM
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oceansfiftyseven
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Default My scratchbuilt v-hull

It works!!! I have finally got my boat running. It is my first prop boat and I want to share. Here is a short video of it's first run. Rich http://youtube.com/watch?v=nUzvNbuTqIs
Old 07-30-2007, 06:15 PM
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Default RE: My scratchbuilt v-hull

That looks great did you build from plans or just your own design? How big is the boat what size engine what prop? The boat looks really stable in the water, looks like it could handle alot more speed. Is the engine air or water cooled? Thanks for sharing


Paul
Old 07-30-2007, 06:41 PM
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Default RE: My scratchbuilt v-hull

Looks like a good running boat!
Old 07-30-2007, 07:11 PM
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Default RE: My scratchbuilt v-hull

I drew up some pictures and started cutting balsa and this is what I came up with. It has a Saito .40 4 cycle airplane engine and a Graupner 54K prop. I put an octura cool-clamp on the head for cooling. The boat is 36" long and weighs 5 lbs even ready to run. Thanks for the comments guys, I spent a couple of months building and setting it up and it was alot of fun to actually get to play with her. She may not be the prettiest or fastest. But man is it fun! Richard
Old 07-30-2007, 08:44 PM
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Default RE: My scratchbuilt v-hull

If you could post some pictures that would be awesome, it would be great to see some new ideas


Thanks,

Paul
Old 07-30-2007, 08:51 PM
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Default RE: My scratchbuilt v-hull

Hay looks real good for running a 4 stroke plane engine!!
Old 08-01-2007, 07:31 AM
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Default RE: My scratchbuilt v-hull

Here are some pictures. I added the fairing yesterday. Richard
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Old 08-01-2007, 08:02 AM
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Default RE: My scratchbuilt v-hull

I think the Boat looks Great !!!

Nothing better than running a boat you built. I looked into the 4 stroke engines ( I don't know much about them) They have more torque and less rpms and are quieter. I guess you can also run bigger props with them too. I did notice the HP on paper isn't really very much, I couldn't find a Saito .40 I don't think they are made anymore but an OS .40 four stroke is only .65hp . My OS CVR.12 on paper is 1hp, so if you ever wanted to push the boat a little faster you could step up in engine size to just about anything and have more power. But the way it is, Is Awesome !!


Paul
Old 08-01-2007, 08:08 AM
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Default RE: My scratchbuilt v-hull

That is pretty cool. I love the 4 stroker!

Ryan
Old 08-26-2007, 01:32 AM
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Default RE: My scratchbuilt v-hull

I have a new video and I could use some advice on how to improve its handling. Thanks, Richard.
http://youtube.com/watch?v=hRU6LGsvuz8
Old 08-26-2007, 02:23 AM
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Default RE: My scratchbuilt v-hull

I think if you move your combo spin/trim tabs from left - right and right - left,you would make better use of them as the tabs on the inside of the hull will help tune straightaway stability,and the spin fins on the outside will help control the transom from sliding out on your turns,if you can just slide the fuel cell forward a few more inches,that would also decrease the amount of deflection the tabs would need to increase stability,nice boat by the way....great job...
Old 08-26-2007, 04:32 AM
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Default RE: My scratchbuilt v-hull

Firstly great boat not many people can get to this stage with boats. I'd move the motor the motor more forward. From your picture it looks at about 20% of your running length. Idealy you would want to get it closer to 30%. I would also make the shaft tube shorter to get that rudder next to or even behind the prop. Where its now its amazing you dont spin out more. You must have very little throw set on your radio. And I would also do as mopartybob sais and switch the trim tabs.

Enjoy that boat sounds awsome.
Old 08-26-2007, 01:00 PM
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Default RE: My scratchbuilt v-hull

First off Awesome! I love the 4 stroke. I must say I'm quite impressed with the torque that engine has. I've never seen a 4 stroke in a boat before. I've also never seen a postitive post on here about 4 strokes in a boat before this thread. (there may have been a few but I never saw any)

Where is your balance point on your boat? How many inches from the back, and what's the total hull length? The reason the other posters have talked about moving your engine and other gear around it to check where the CG or balance point of your boat is. Post those dimensions and others more familiar with V hulls will be able to help you get it balanced just right.

keep the video's coming as the boat progresses.
Old 08-26-2007, 01:10 PM
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Default RE: My scratchbuilt v-hull

the header at the top of the second video,stated that he moved the engine to 30%,....maybe 40% ought to do it....[:-]

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