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Showing results 1 to 25 of 500
Search took 0.05 seconds. Search: Posts Made By: bobperry

Forum: Cruising & Liveaboard Forum

2 Hours Ago

Replies: 821

Full or fin keel?

Views: 62,631

Posted By bobperry

Re: Full or fin keel?

Fine Paulo. That's exactly what I thought. Thanks for clarifying that.

Forum: Sailboat Design and Construction

3 Hours Ago

Replies: 339

Bob Perry's take on Wolfenzee's dream boat

Views: 7,884

Posted By bobperry

Re: Bob Perry's take on Wolfenzee's dream boat

Wolf:
You have a half angle of entry of 30 degrees at the DWL. That is very full by any criteria.
As I said, "resulting in a very full bow."

Forum: Cruising & Liveaboard Forum

7 Hours Ago

Replies: 821

Full or fin keel?

Views: 62,631

Posted By bobperry

Re: Full or fin keel?

Paulo those are lovely photos you downloaded from the internet. I'm not sure what they have to do with the tandem keel though. I see no mention of the tandem keel in any of that downloaded material....

Forum: Sailboat Design and Construction

15 Hours Ago

Replies: 339

Bob Perry's take on Wolfenzee's dream boat

Views: 7,884

Posted By bobperry

Re: Bob Perry's take on Wolfenzee's dream boat

"as much a gift from the gods as it is the work of any designer."
I don't believe that for one second. Been at it far to long to go for that.

Forum: Sailboat Design and Construction

16 Hours Ago

Replies: 339

Bob Perry's take on Wolfenzee's dream boat

Views: 7,884

Posted By bobperry

Re: Bob Perry's take on Wolfenzee's dream boat

Two of my most "radical" designs ICON 63' and MERIDIAN 70' both with very fine bows and wide sterns, single rudders, are both boats with very good directional stability. They drive like they are on...

Forum: General Discussion (sailing related)

1 Day Ago

Replies: 22

Prop size for 4-107

Views: 359

Posted By bobperry

Re: Prop size for 4-107

Pye:
Sounds like a safe plan to me. Please let us know how the prop works out.

Maybe a nice snatch block for your wife?

Forum: General Discussion (sailing related)

1 Day Ago

Replies: 22

Prop size for 4-107

Views: 359

Posted By bobperry

Re: Prop size for 4-107

JonB;
I never really thought about it. I design the rig prportions by eye with a target SA/D in mind. General rig proportions will be a fucntion of the type of boat I am after and the position of...

Forum: General Discussion (sailing related)

1 Day Ago

Replies: 22

Prop size for 4-107

Views: 359

Posted By bobperry

Re: Prop size for 4-107

Ok we know a few things:
I figured a 2.57 to 1 reduct gear and you have a 2.51 to 1, close enough.
Your prop is either a 16 by 16 or a 16 by 12.
16 by 12 is much close to my recommended 15 by 10...

Forum: General Discussion (sailing related)

2 Days Ago

Replies: 22

Prop size for 4-107

Views: 359

Posted By bobperry

Re: Prop size for 4-107

JonB:
I don't know about "square" sail plans. I'm not sure I would go along with that theory.
But for props diameter is the more important number so it figures you should give up pitch for more...

Forum: Cruising & Liveaboard Forum

2 Days Ago

Replies: 821

Full or fin keel?

Views: 62,631

Posted By bobperry

Re: Full or fin keel?

Oh come on Paulo.
Me? An attitude? I'm not sure what you mean.

Forum: General Discussion (sailing related)

2 Days Ago

Replies: 22

Prop size for 4-107

Views: 359

Posted By bobperry

Re: Prop size for 4-107

Pye:
Porfin has a good idea there.
Keep us in the loop on this please. Props are a bit of a black art and I'm always interested in learning more about prop sizing.

Forum: Cruising & Liveaboard Forum

2 Days Ago

Replies: 821

Full or fin keel?

Views: 62,631

Posted By bobperry

Re: Full or fin keel?

Paulo:
I'll have to defer to your superior knowledge in the area of yacht design and yacht design offices. I have not been at this very long. You obviosly have far more depth and bredth to your...

Forum: General Discussion (sailing related)

2 Days Ago

Replies: 22

Prop size for 4-107

Views: 359

Posted By bobperry

Re: Prop size for 4-107

I don't know what gear redcution you have but a 16 by 16 three blade sounds like way too much prop. On the V-40's we found a 15 by 10 three blade (as I keep recommending) worked best. I think the...

Forum: General Discussion (sailing related)

2 Days Ago

Replies: 7

Leave up the Jib?

Views: 511

Posted By bobperry

Re: Leave up the Jib?

Harbor:
Part of that decision will be based upon how your boat balances. This would be critical if you need to get to weather. Some masthead rigged sloops have the mast pretty far aft and they don't...

Forum: Cruising & Liveaboard Forum

2 Days Ago

Replies: 821

Full or fin keel?

Views: 62,631

Posted By bobperry

Re: Full or fin keel?

Don't see anything about CFD Paulo. How are you certain CFD was used? Can you provide a CFD study that has been published? I'd like to see that for my own education. I wouldn't make the automatic...

Forum: General Discussion (sailing related)

2 Days Ago

Replies: 22

Prop size for 4-107

Views: 359

Posted By bobperry

Re: Prop size for 4-107

Smoking and overheating are signs of too much prop. You probably se some black oil in your exhaist also, right? Change the prop to an 18 by 12 and you should be fine. If you prefer the performance...

Forum: Sailboat Design and Construction

2 Days Ago

Replies: 339

Bob Perry's take on Wolfenzee's dream boat

Views: 7,884

Posted By bobperry

Re: Bob Perry's take on Wolfenzee's dream boat

Marty:
I agree with you. I was thinking around 235 so an initial "punitive" provisionsl rating of 225would see a reasonable place to start.

Forum: Sailboat Design and Construction

3 Days Ago

Replies: 339

Bob Perry's take on Wolfenzee's dream boat

Views: 7,884

Posted By bobperry

Re: Bob Perry's take on Wolfenzee's dream boat

Ski:
Yep. I don't know exactly how Monk arrived at 34' by I read that when I was a kid and it stuck with me. Might even be true.

Forum: General Discussion (sailing related)

3 Days Ago

Replies: 22

Prop size for 4-107

Views: 359

Posted By bobperry

Re: Prop size for 4-107

18 by 12 for two blade
15 by 10 for three blade

Forum: Cruising & Liveaboard Forum

3 Days Ago

Replies: 821

Full or fin keel?

Views: 62,631

Posted By bobperry

Re: Full or fin keel?

"I believe they can design them in an effective way otherwise they would not be using them."

What a novel thought. I wonder how many design features have been tried over the years that have proven...

Forum: Cruising & Liveaboard Forum

3 Days Ago

Replies: 821

Full or fin keel?

Views: 62,631

Posted By bobperry

Re: Full or fin keel?

The gap distance between the two fins is critical Look at it on the AC boat. Most more mundane boats do not have the bulb length to accomodate the required gap distance.

Forum: Sailboat Design and Construction

3 Days Ago

Replies: 339

Bob Perry's take on Wolfenzee's dream boat

Views: 7,884

Posted By bobperry

Re: Bob Perry's take on Wolfenzee's dream boat

Out:
You are totally correect. It goes for almost any boat that some combo of wave and wnd on a broad reach will make it behave less than gracefully. Old Ed Monk Sr. said that for Puget Sound a DWL...

Forum: Sailboat Design and Construction

3 Days Ago

Replies: 339

Bob Perry's take on Wolfenzee's dream boat

Views: 7,884

Posted By bobperry

Re: Bob Perry's take on Wolfenzee's dream boat

JonB:
I am working hard right here on Port Susan trying to create my own alternative universe.

Hot rod Alberg 35:
I hate to kill a fairy tale but here goes.
If you removed the rudder from the...

Forum: Sailboat Design and Construction

3 Days Ago

Replies: 339

Bob Perry's take on Wolfenzee's dream boat

Views: 7,884

Posted By bobperry

Re: Bob Perry's take on Wolfenzee's dream boat

I believe there is an alternative universe where Alberg 35's with skeg hung rudders will be considered high performance boats and be faster than the modern designs of today.

Right.

Forum: Sailboat Design and Construction

3 Days Ago

Replies: 339

Bob Perry's take on Wolfenzee's dream boat

Views: 7,884

Posted By bobperry

Re: Bob Perry's take on Wolfenzee's dream boat

Ok, I missed that PHRF reference. I'd start Wolf with a rating of 220.

Showing results 1 to 25 of 500

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