Home made H16 anti-pitchpole bow planes

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waiex191

Rank: Mate

Registered: Oct 07, 2020

Last visit: Feb 29, 2024

Posts: 359
Posted: Oct 18, 2021 - 09:50 PM

I know, I shouldn't need these. But I wanted to try it so we would have some more margin as we were learning.

I made it out of .090" 6061-T6 aluminum. To make the sharp bends I annealed the material locally.

Hope to get a chance to try them and report back.

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Bryan in Poplar Grove, IL
Supercat 17, unknown year. Future project
Hobie 16, 1977 - died a spectacular death https://youtu.be/Y7O22bp2MVA
Hobie 16, 1978 - current boat
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jack108136

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Registered: Jul 19, 2012

Last visit: Nov 01, 2024

Posts: 156
Posted: Oct 19, 2021 - 05:25 AM

They work good until they don't.

If it gets too far down it goes the equal and opposite reaction happens.

A trip around the bow from the trapeze turns that thing into a machete.
Andinista

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Registered: Aug 18, 2003

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Posted: Oct 19, 2021 - 06:59 AM

QuoteA trip around the bow from the trapeze turns that thing into a machete.

Yes, that’s dangerous! Perhaps the edges could be covered with rubber seals.
wxguy

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Registered: Jul 20, 2016

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Posted: Oct 19, 2021 - 07:43 AM

If these worked, every H16 would have them on the bows. Learn to sail the boat without those meat slicers. Adding more aft mast rake helps in this department.

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Master UniRig Sailor
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jack108136

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Posted: Oct 19, 2021 - 07:12 PM

wxguy & I setup next to each other at the Hobie Midwinters East, St Augustine, 1984. I've still got the rudders from his buddy.
MN3

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Registered: Jun 20, 2006

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Posts: 7089
Posted: Oct 21, 2021 - 06:12 PM

QuoteYes, that’s dangerous! Perhaps the edges could be covered with rubber seals.

death race 2021!!!!

Add a fire throwing bow sprit!
waiex191

Rank: Mate

Registered: Oct 07, 2020

Last visit: Feb 29, 2024

Posts: 359
Posted: Oct 21, 2021 - 08:58 PM

MN3
death race 2021!!!!
Add a fire throwing bow sprit!

Could be the solution to the kayak problem!

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Bryan in Poplar Grove, IL
Supercat 17, unknown year. Future project
Hobie 16, 1977 - died a spectacular death https://youtu.be/Y7O22bp2MVA
Hobie 16, 1978 - current boat
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MN3

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Posts: 7089
Posted: Oct 22, 2021 - 08:36 AM

haha
jack108136

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Registered: Jul 19, 2012

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Posts: 156
Posted: Oct 22, 2021 - 11:36 AM

Someone needs to post up the Cat vs jet ski video that's hidden here.
MN3

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Registered: Jun 20, 2006

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Posts: 7089
Posted: Oct 22, 2021 - 01:04 PM

jack108136wxguy & I setup next to each other at the Hobie Midwinters East, St Augustine, 1984. I've still got the rudders from his buddy.

If you mean you watched him sail away into the horizon, so have most that raced him.

Fortunately I was in a different class when we were in the same race (Mini MachoMan).

This was a distance race. We were in first (beating a Nacra20 flat out) when we capsized with a spinnaker at the last jibe about .5 miles from the finish
waiex191

Rank: Mate

Registered: Oct 07, 2020

Last visit: Feb 29, 2024

Posts: 359
Posted: Nov 25, 2021 - 10:52 AM

So we tried them out yesterday. We were not even on a reach, we were just tacking upwind. The wind and boat were pretty stable, and the bow dipped.
https://youtu.be/WQXUIY0gJz8

I'm a believer.

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Bryan in Poplar Grove, IL
Supercat 17, unknown year. Future project
Hobie 16, 1977 - died a spectacular death https://youtu.be/Y7O22bp2MVA
Hobie 16, 1978 - current boat
--
Andinista

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Registered: Aug 18, 2003

Last visit: Dec 13, 2023

Posts: 880
Posted: Nov 26, 2021 - 11:58 AM
Andinista

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Registered: Aug 18, 2003

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Posts: 880
Posted: Nov 26, 2021 - 11:58 AM

please...
mikekrantz

Rank: Lubber

Registered: Mar 06, 2006

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Posts: 99
Posted: Nov 26, 2021 - 07:06 PM

Rudder winglets would be more effective and less dangerous.
waiex191

Rank: Mate

Registered: Oct 07, 2020

Last visit: Feb 29, 2024

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Posted: Nov 26, 2021 - 08:08 PM

mikekrantzRudder winglets would be more effective and less dangerous.

What are those? I have a hard time getting my rudders down and locked as they are.

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Bryan in Poplar Grove, IL
Supercat 17, unknown year. Future project
Hobie 16, 1977 - died a spectacular death https://youtu.be/Y7O22bp2MVA
Hobie 16, 1978 - current boat
--
charlescarlis

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Posted: Nov 26, 2021 - 10:19 PM

More like an elevator trim tab; trim down to keep nose up I'm guessing so would actually help to keep rudders down maybe. Those bow tabs look like they work, but also look like razors, especially handling the boat by the bows on land or if in water around swimmers. That's why people are a little itchy about the idea. Could also mod the bow planes with a thicker, less slicey edge, perhaps welding a rod on the edge or sticking the above referenced trim stock on it. If trim stock, I'd glue it with 3M something, because I doubt the PSA will hold up.

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Chuck C
NACRA 500 Mk2
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waiex191

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Registered: Oct 07, 2020

Last visit: Feb 29, 2024

Posts: 359
Posted: Nov 27, 2021 - 12:38 AM

It is actually pretty thick metal, not very slicey. I rounded/deburred all the edges to an aviation standard. To bend the material tight enough I had to anneal it.
In my limited experience, the bows are buried in the water during the pitch pole when I go rushing by.
I definitely don't see any concern with handling the boat on land or in the shallows.

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Bryan in Poplar Grove, IL
Supercat 17, unknown year. Future project
Hobie 16, 1977 - died a spectacular death https://youtu.be/Y7O22bp2MVA
Hobie 16, 1978 - current boat
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revintage

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Posts: 281
Posted: Nov 27, 2021 - 08:25 AM

Sorry to say, but they will not help much against pitchpoling, only added volume will. What will happen when you nose dive and the angle of the metall gets below horizontal, is that you get a quicker somersault.

Edited by revintage on Nov 27, 2021 - 08:31 AM.

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Brgds
Lars

Frankentri 5.8/5.5/Inter20
Aerow trimaran foiler

https://www.facebook.com/groups/1192604934176635
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mikekrantz

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Registered: Mar 06, 2006

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Posts: 99
Posted: Nov 27, 2021 - 09:46 AM

you set the winglets at zero angle of attack. When the bow goes down, it creates negative lift on the stern, pulling the stern down - leveling the boat. It also has the added benefit of reducing pitching/hobby horsing in chop - works as a dampener on the motion.
revintage

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Posted: Nov 27, 2021 - 10:40 AM

Hi Mikekrantz, I suppose you are talking about adding aerofoil shaped winglets to the rudderblades, which is the sensible thing to do ?

Edited by revintage on Nov 27, 2021 - 11:06 AM.

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Brgds
Lars

Frankentri 5.8/5.5/Inter20
Aerow trimaran foiler

https://www.facebook.com/groups/1192604934176635
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