Doug,

Thanks for taking the time.


You need a set of bunks conformed to the hull shape.

Actually, the bunks are formed to the hull quite well. We bolted the
supports on in-place with the boat already setting above the trailer
(on blocks). So they fit darn near perfecty.



I hope that's not true, if so your boat is seriously underbuilt. A wooden
boat will have stem & keel members, they should be strong enough to lift
the boat much less pull it onto a trailer.


The keel is plenty strong (huge timber). But figuring that the boat weighs
4000 lbs the force to pull on it might be up to, what?, 2000 or more
lbs. And the stem is a seperate part from the keel. I don't know as that
I'd want to be pulling the boat by that. It was built to take pressure
*pushing*
on the keel. But it was never built for the keel to be pulled on.
(Remember,
this boat was built to be LIFTED by the lift rings.)






#1: Am I right in thinking the Coefficient of Friction can not be more
than 1.0


No. Max CFr can be far greater than 1, in theory it can reach infinity. In
normal circumstances, sliding friction ranges from about .2 to .7

Ok, thanks.


but it can be reduced with substances called "lubricants" and increased
with substances called "glue." Dazzling new technology


Wise a**.




My suggestions- check the weight distribution on the bunks, try to get
more of the weight onto the trailer rollers... try changing the carpet
surface... add a set of transverse bunks conformed to the hull shape...
use slippery bottom paint...


The only roller is the keel roller. the rest of the boat is supported on
bunks
and that's what we're supposed to do with wood boat. Not very possible
to shift any more weight to the keel.

I agree about changing the carpet surface to something like high-density
plastic
that might be more slippery. Also might try that new fangeled "lubricant"
stuff
they make to spray on the carpet.



Fair Skies
Doug King

May the Four Winds Blow You Safely Home,
Gary

Gary wrote:
Doug,

Thanks for taking the time.


You're quite welcome.



You need a set of bunks conformed to the hull shape.


Actually, the bunks are formed to the hull quite well. We bolted the
supports on in-place with the boat already setting above the trailer
(on blocks). So they fit darn near perfecty.


My preference is 2 or 3 transverse bunk matched to the boat's hull
section, aligned with the bulkheads inside the hull. Best support you
can have out of the water, and it puts the boat in exactly the right
spot on the trailer every time.



The keel is plenty strong (huge timber). But figuring that the boat weighs
4000 lbs the force to pull on it might be up to, what?, 2000 or more
lbs. And the stem is a seperate part from the keel. I don't know as that
I'd want to be pulling the boat by that. It was built to take pressure
*pushing*
on the keel. But it was never built for the keel to be pulled on.
(Remember,
this boat was built to be LIFTED by the lift rings.)


Well, think about how much force it takes to push it through the water
at full speed. All that force is transmitted through the keel & frames
(probably floor timbers) & planks.


but it can be reduced with substances called "lubricants" and increased
with substances called "glue." Dazzling new technology



Wise a**.

Sorry, couldn't resist





My suggestions- check the weight distribution on the bunks, try to get
more of the weight onto the trailer rollers... try changing the carpet
surface... add a set of transverse bunks conformed to the hull shape...
use slippery bottom paint...



The only roller is the keel roller. the rest of the boat is supported on
bunks
and that's what we're supposed to do with wood boat.

Yep, that's true


I agree about changing the carpet surface to something like high-density
plastic
that might be more slippery.

I used free... picked up by the side of the road... heavy shag carpet on
a number of trailers but it is not really good for it. Most recently
I've been using a fairly high grade of rubber backed indoor-outdoor
loop-pile carpet.


... Also might try that new fangeled "lubricant"
stuff
they make to spray on the carpet.


Hmm, you might be careful asking for "carpet lubricant" at Home Depot!
But waxing the hull... or even putting on this Teflon stuff they make
for trailerable racing sailboats... Starbrite is one brand of it...

Fair Skies
Doug King

"Gary" wrote in message
...

Doug,

Thanks for taking the time.


You need a set of bunks conformed to the hull shape.

Actually, the bunks are formed to the hull quite well. We bolted the
supports on in-place with the boat already setting above the trailer
(on blocks). So they fit darn near perfecty.



I hope that's not true, if so your boat is seriously underbuilt. A
wooden
boat will have stem & keel members, they should be strong enough to lift
the boat much less pull it onto a trailer.


The keel is plenty strong (huge timber). But figuring that the boat weighs
4000 lbs the force to pull on it might be up to, what?, 2000 or more
lbs. And the stem is a seperate part from the keel. I don't know as that
I'd want to be pulling the boat by that. It was built to take pressure
*pushing*
on the keel. But it was never built for the keel to be pulled on.
(Remember,
this boat was built to be LIFTED by the lift rings.)






#1: Am I right in thinking the Coefficient of Friction can not be more
than 1.0


No. Max CFr can be far greater than 1, in theory it can reach infinity.
In
normal circumstances, sliding friction ranges from about .2 to .7

Ok, thanks.


but it can be reduced with substances called "lubricants" and increased
with substances called "glue." Dazzling new technology


Wise a**.




My suggestions- check the weight distribution on the bunks, try to get
more of the weight onto the trailer rollers... try changing the carpet
surface... add a set of transverse bunks conformed to the hull shape...
use slippery bottom paint...


The only roller is the keel roller. the rest of the boat is supported on
bunks
and that's what we're supposed to do with wood boat. Not very possible
to shift any more weight to the keel.

I agree about changing the carpet surface to something like high-density
plastic
that might be more slippery. Also might try that new fangeled "lubricant"
stuff
they make to spray on the carpet.



Fair Skies
Doug King

May the Four Winds Blow You Safely Home,
Gary



Just pull forward at a low speed and hit the brakes. The boat will slide up
in to the bow stop. I do this as is easier than winching and does a better
job. I have the very wide yellow bow roller with the extra rollers on the
outside.
Bill