Re:Double bow bulb can be calculated for in DS
› DELFTship forum › Hydrostatics and stability › Double bow bulb can be calculated for in DS › Re:Double bow bulb can be calculated for in DS
For another perspective, here are some Froude number values
An Australian team used the DTMB 5414 model and arrived at
FN values of 0.2755 for 20 knots and 0.4136 for 30 knots. Their model testing of the DDG-51 hull is described at:
http://www.cyberiad.net/library/pdf/tsl00a.pdf
and this is (IIRC) a model of 466 feet at the waterline and 505 feet LOA. For my DELFTship model these are the major values:
base model (no 2nd bulb/dome)
Design Length: 562′
LOA: 559.5
LWL: 524.16
Block: 0.4388
modified model (2nd bulb/dome, thin)
Design Length: 562′
LOA: 559.5
LWL: 524.17
Block: 0.4388
modified model (2nd bulb/dome, thicker)
Design Length: 562′
LOA: 559.5
LWL: 524.17
Block: 0.4391
The Froude numbers at various speeds:
Speed Base Model Thin 2nd bulb Thicker 2nd bulb
17.5 0.272 same as base same as base
20 0.310
26.5 0.411
27 0.419
30 0.466
38 0.590
38.5 0.598 [file name=11_2nd_bow_bulb_3.jpg size=66956]http://delftship.net/delftship/media/kunena/attachments/legacy/files/11_2nd_bow_bulb_3.jpg[/file]
Your account
Recent Topics
-
No volume but no leak points
by
Juan
1 day, 6 hours ago -
install problems
by
tcurdt
2 weeks, 3 days ago -
Import lines plan (DXF) back into D/S?
by
Paul
3 weeks, 5 days ago -
Remove Background Image?
by
Paul
3 weeks, 5 days ago -
Size of background image
by
Axel
1 month, 1 week ago -
Stepped hull and Spray Rails
by
Tahoesteam1
1 month, 2 weeks ago -
Lines plan disabled
by
Martin
2 months, 1 week ago -
Modeling the 1907 U.S. Brigantine Galilee
by
Terrance Egolf
3 months, 2 weeks ago -
VCG and GM of Smit Rotterdam
by
DuncanH
3 months, 2 weeks ago -
Revision/save history?
by
Jamie
3 months, 3 weeks ago