Herreschoff Dinghy

[Toxophilite]

Nice! No affiliation. Decent price
Looks smaller than 14' though
https://www.facebook.com/marketplace...7-d69a632ce32f336330606_6716447958379772_4230783714407165887_n.jpg

[Edward Pearson]

Re: Herreschoff Dinghy

That's super nice. Looking at those beautifully fine bent knees, the builder new exactly what he was doing. NGH himself built them at all different lengths by spacing the molds.

A keeper. It'll row super nice. Just needs a nice trailer for it. It will always be 'a Herreshoff'' and a NGH design at that.

[Edward Pearson]

Re: Herreschoff Dinghy

I remember reading the little book on that dinghy. There's a few things worth saying from observing how NGH built them that's relevant. The book was written by an NGH boat builder who worked on them.





1. The dinghies were built upside down, with the ribs let into the molds then planked over. I understand NGH built most of his boats like this. The advantage is when you lift it off the molds, the structural timbers are already in and the boat doesn't spring to a different shape. If you care about it being exact (racing measurement rules), you're trying to make it as beautifull as the drawing (just look at an Alerion) or want it to come out hydrodynamically exactly as drawn (when you're winning America's Cups) then this build method achieves it.


2. The way the ribs are steamed over the molds allows you to hold the timber inside a compresssion strap. This puts the rib into compression as it bends, so it doesn't elongate on the outer radius of the bend. If it's allowed to lengthen the timber becomes weaker. If you look at a boat that has the ribs steamed then put in after its planked and turned over, you can't hold them under compression with a strap and lengthening occurs on the outer edge at the point of the tightest bilge radius and eventually this is a failure point, where its additionally weakened by a fastening hole.

Nat Herreshoff's method of building that dinghy is still the best way of doing it, if you want it perfect as drawn. It also gives you strong, unweakened ribs. Steam bent compression straps are available from Veritas. You just tighten the blocks to the ends just so, so that the outer timber can't elongate but whilst avoiding over compression occurring on the inside of the bend. This shows the apparatus:



I've got a large and small one and they're the most perfect way of doing it.

P.s. Toxo - no C in Herreshoff. The pronounciation is another subject.

[Toxophilite]

Re: Herreschoff Dinghy

Tried to correct it, no dice, alas my ignorance will liv eon the internet FOREVER! I like your steam bending jibs. I did something similar, including the strap, to steam bend the tips of recurve bows. works a treat340430_10150373254334833_2112470703_o.jpg

I remember reading the little book on that dinghy. There's a few things worth saying from observing how NGH built them that's relevant. The book was written by an NGH boat builder who worked on them.





1. The dinghies were built upside down, with the ribs let into the molds then planked over. I understand NGH built most of his boats like this. The advantage is when you lift it off the molds, the structural timbers are already in and the boat doesn't spring to a different shape. If you care about it being exact (racing measurement rules), you're trying to make it as beautifull as the drawing (just look at an Alerion) or want it to come out hydrodynamically exactly as drawn (when you're winning America's Cups) then this build method achieves it.


2. The way the ribs are steamed over the molds allows you to hold the timber inside a compresssion strap. This puts the rib into compression as it bends, so it doesn't elongate on the outer radius of the bend. If it's allowed to lengthen the timber becomes weaker. If you look at a boat that has the ribs steamed then put in after its planked and turned over, you can't hold them under compression with a strap and lengthening occurs on the outer edge at the point of the tightest bilge radius and eventually this is a failure point, where its additionally weakened by a fastening hole.

Nat Herreshoff's method of building that dinghy is still the best way of doing it, if you want it perfect as drawn. It also gives you strong, unweakened ribs. Steam bent compression straps are available from Veritas. You just tighten the blocks to the ends just so, so that the outer timber can't elongate but whilst avoiding over compression occurring on the inside of the bend. This shows the apparatus:



I've got a large and small one and they're the most perfect way of doing it.

P.s. Toxo - no C in Herreshoff. The pronounciation is another subject.