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CG for different style boats

Old 06-30-2004, 10:42 AM
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twostroker
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Default CG for different style boats

Hello All,

I have never strayed from building and flying airplanes before so boating is new to me, so please bare with me here. Also I never thought I would stray from airplanes, but I got bit by the boat bug after seeing them on the water....cool stuff...and not easy to get right either. Should be right up my alley!

My question is about Center of Gravity for different styles of boats, do different boats balance in different places. For example does a Deep Vee balance at the same place as a Hydro, Cat, or Tunnel.

What % do they balance at, and if different boats balance different %, what are they.

Also I know that they balance from the rear (opposite as aircraft) but do you measure from the most rear part of the hull in the water or from the prop, trim tabs, or airfoils that may be behind the hull.

Thanks for the input.

Tim
Old 07-01-2004, 07:05 PM
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Ron Olson
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Default RE: CG for different style boats

Measure from the transom, we seem to use that as a general rule of thumb. Most of the hulls that you mentioned have the CG from 27-30% forward of the transom. Some of the newer mono hulls can go upwards of 33% that don't use trim tabs.
We can't do all of the tricks that planes do (on purpose anyway) but we seem to have a lot of fun.
Old 07-02-2004, 05:48 AM
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Default RE: CG for different style boats

ORIGINAL: Ron Olson

Measure from the transom, we seem to use that as a general rule of thumb. Most of the hulls that you mentioned have the CG from 27-30% forward of the transom. Some of the newer mono hulls can go upwards of 33% that don't use trim tabs.
We can't do all of the tricks that planes do (on purpose anyway) but we seem to have a lot of fun.
Hey Ron a rigger is a low flying aircraft!
Old 07-02-2004, 07:23 AM
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twostroker
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Default RE: CG for different style boats

Thanks for the input. As far as boats not doing all the "stuff an airplane will do" I have seen some very fast "loops" and maybe even something that could be call a "snaproll" so far.

Fun Stuff!

Tim
Old 07-02-2004, 02:24 PM
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Ron Olson
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Default RE: CG for different style boats

Yeah, we just don't do it intentionally. You ought to see some of the stunts that I've got on videotape!
I can't keep a boat on the water or a plane in the air!

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