martinwoolwich
New member
Can anyone tell me if the new Broom450 has a semi-displacement hull or a planing hull?
Broom 450
- Thread starter martinwoolwich
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Chris_d
Well-known member
Planing hull, but it is unusual in having a small keel.
martinwoolwich
New member
Some advice then please for a novice. I currently have a Broom 38 - semi displacement. We're only interested in the 450 because of its extra size and most importantly it's third cabin option. The additional speed is an add-on bonus but not really that important, we're really quite happy cruising along at 17 knots or so.
We're also keen to ensure that we have a stable journey, and the boat feels comfortable in ragged seas. Am I right in believing that moving from semi-displacement to planing will give me the benefit of speed but I will suffer on the ride? (Compared to the 38)
We're also keen to ensure that we have a stable journey, and the boat feels comfortable in ragged seas. Am I right in believing that moving from semi-displacement to planing will give me the benefit of speed but I will suffer on the ride? (Compared to the 38)
G
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Cue Byron
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Chris_d
Well-known member
Not sure if I qualify as an expert on these, but as I understand it the semi-displacement Brooms have been designed with a mix of inland and sea use in mind. Semi-displacement boats generaly don't handle well at over 20-25knots, they can ride on the keels giving twitchy steering and also tend to broach in following seas at high speeds, Having said that the Broom S-D boats have a very good reputation for seakeeping. Not sure if there is much difference in ride but the
S-D boats will generaly make more spray in choppy seas. The S-D Brooms all handle extremely well at river speeds so are better for this, the planing hulls will be more easily blown about and lack directional stability at slow speed, and with their larger engines go too fast at idle anyway.
Probably depends on your intended use, if all offshore then go for the 450, if you still want to potter up the Thames etc.. then get the 42CL
S-D boats will generaly make more spray in choppy seas. The S-D Brooms all handle extremely well at river speeds so are better for this, the planing hulls will be more easily blown about and lack directional stability at slow speed, and with their larger engines go too fast at idle anyway.
Probably depends on your intended use, if all offshore then go for the 450, if you still want to potter up the Thames etc.. then get the 42CL
D
Deleted User YDKXO
Guest
Chris d's words of wisdom are correct. The CL range has a semi displacement hull form designed for both inland and coastal use. Having said this, I understand that the 38 and 42CL's make good seaboats with a soft ride into a head sea albeit with plenty of spray but I'm told they're a little wayward in a following sea. On the other hand, the OS hulls such as the 450 are specifically designed for offshore use with full planing capability and a higher top speed; typically, the ride will be a little harder in a head sea but better behaved in a following sea as there is less keel to be pushed about. Both the CL and the OS are a doddle to handle at marina speeds because the windage is relatively low and the keel grips the water.
As an ex Broom owner, I would go for the 450 OS if you want it specifically for offshore use; it is basically the same hull as the old 44 which was an excellent seaboat. On the other hand, if the primary use is on the river with an occasional offshore foray to sea a 42 CL would be just fine
As an ex Broom owner, I would go for the 450 OS if you want it specifically for offshore use; it is basically the same hull as the old 44 which was an excellent seaboat. On the other hand, if the primary use is on the river with an occasional offshore foray to sea a 42 CL would be just fine
G
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Could'nt have put it better myself Mike and I'm pretty fluid in this sort of thing
"Your chance to own a Crown is now"
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miket
Active member
To confuse further some use the term "semi planing", for these hulls. Previous posts are spot on.
One other factor is Draft (underwater) I believe the 450 OS draws about 4 ft 3 ins, whereas the 42 CL is nearer 3 ft 6 ins.
This may be a factor if you are considering UK rivers or Inland Europe.
I currently own a Broom 37 (1992) with very similar hull to the current 450. I have also looked closely at the 42 CL which I consider the likely sucessor, but not yet.
Advantages of 42 CL seem to be:
less draft
lower freeboard
More modern appearance
good top speed.
If I was going to use it wholly on the sea I might go for the 450, but probably the slightly smaller 415 (?) the natural sucessor to the 37.
One other factor is Draft (underwater) I believe the 450 OS draws about 4 ft 3 ins, whereas the 42 CL is nearer 3 ft 6 ins.
This may be a factor if you are considering UK rivers or Inland Europe.
I currently own a Broom 37 (1992) with very similar hull to the current 450. I have also looked closely at the 42 CL which I consider the likely sucessor, but not yet.
Advantages of 42 CL seem to be:
less draft
lower freeboard
More modern appearance
good top speed.
If I was going to use it wholly on the sea I might go for the 450, but probably the slightly smaller 415 (?) the natural sucessor to the 37.
