Reply
 
Thread Tools Search this Thread
 
Old 09 January 2011, 13:45   #151
Member
 
Country: Finland
Town: Helsinki
Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
Join Date: Oct 2009
Posts: 896
Quote:
Originally Posted by Cookee View Post
As Dirk said so long as it's for racing only then it's fine.

570cm is fine, if anything it's well over 19' from memory - I think the OCR boats are running about 64mph with Yamaha 130hp V4 motors but that is without nose cones etc. I would imagine with that sort of motor they would be a lot faster than the 20 or 21, they are certainly faster in a straight line than the 18 and probably the newest of the Baker designs.
OK, thanks for info, maybe one day......A pre 1998 would be OK for leisure also, as no CE needed for those. In the V-150 old Merc 2 strokes, carbed or EFi seams to do well, maybe more than 150hp in reality.
__________________

__________________
fun on a boat is inversely proportional to size...sort of anyway
C-NUMB is offline   Reply With Quote
Old 08 February 2011, 08:49   #152
Member
 
Cookee's Avatar
 
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Been a bit busy recently - a second Phantom is in the mould and we have the floors in - the fuel tanks complete, one of the motors has been in and out (tight squeeze!) and the foams for the bulkheads are all in:
Attached Thumbnails
Click image for larger version

Name:	P2070577.jpg
Views:	171
Size:	58.3 KB
ID:	56980   Click image for larger version

Name:	P2070579.jpg
Views:	221
Size:	65.3 KB
ID:	56981   Click image for larger version

Name:	P2070580.jpg
Views:	162
Size:	32.7 KB
ID:	56982  
__________________

__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
Cookee is offline   Reply With Quote
Old 08 February 2011, 08:51   #153
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
I like the mini-bar
__________________
Downhilldai is offline   Reply With Quote
Old 08 February 2011, 09:30   #154
Member
 
Country: Finland
Town: Helsinki
Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
Join Date: Oct 2009
Posts: 896
Quote:
Originally Posted by Cookee View Post
Been a bit busy recently - a second Phantom is in the mould :
Hi, it looks like you have 2 different types of core on the phantom, balsa and "divinycell" type.
Why is that(I know nothing about boat building), just curious?
__________________
fun on a boat is inversely proportional to size...sort of anyway
C-NUMB is offline   Reply With Quote
Old 09 February 2011, 03:43   #155
Member
 
Cookee's Avatar
 
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Quote:
Originally Posted by C-NUMB View Post
Hi, it looks like you have 2 different types of core on the phantom, balsa and "divinycell" type.
Why is that(I know nothing about boat building), just curious?
End grain Balsa has impact resistance second to none whereas any foam will crush and cause a failure. Balsa is used for the area under the fuel tank and planing pad as well as in spray rails - the big boat has it everywhere!
__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
Cookee is offline   Reply With Quote
Old 09 February 2011, 04:18   #156
Member
 
Country: Finland
Town: Helsinki
Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
Join Date: Oct 2009
Posts: 896
Quote:
Originally Posted by Cookee View Post
End grain Balsa has impact resistance second to none whereas any foam will crush and cause a failure. Balsa is used for the area under the fuel tank and planing pad as well as in spray rails - the big boat has it everywhere!
OK, thanks, always learning new things on this forum! The other day checked on YouTube the sea trials on the scale boat of BananaShark 34.
One question come to my mind, what is the proper scale speed? Guess the size, weight and even engine power(?) is logically derived from the real thing as per scale ratio,
but how about speed? If you model would be 1:10 and target speed for the real thing 70 mph, for sure testing speed is higher than 7 mph.....is there a rough formula for that?
__________________
fun on a boat is inversely proportional to size...sort of anyway
C-NUMB is offline   Reply With Quote
Old 09 February 2011, 04:24   #157
Member
 
Cookee's Avatar
 
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Quote:
Originally Posted by C-NUMB View Post
OK, thanks, always learning new things on this forum! The other day checked on YouTube the sea trials on the scale boat of BananaShark 34.
One question come to my mind, what is the proper scale speed? Guess the size, weight and even engine power(?) is logically derived from the real thing as per scale ratio,
but how about speed? If you model would be 1:10 and target speed for the real thing 70 mph, for sure testing speed is higher than 7 mph.....is there a rough formula for that?
Testing a model in the sea like that will never be as scientific as that - it's more of a "If it looks right it probably is" sort of thing. To get the speed just right for everything else would be a lot of effort for a very similar result.

We'll know if we got it right or not in the not too distant future I hope - we'll let you all know when it's on the water!
__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
Cookee is offline   Reply With Quote
Old 09 February 2011, 16:52   #158
Member
 
Country: UK - England
Town: Poole
Make: Bananashark
Length: 6m +
Engine: Outboard
Join Date: Jun 2008
Posts: 15
Quote:
Originally Posted by C-NUMB View Post
Hi, it looks like you have 2 different types of core on the phantom, balsa and "divinycell" type.
Why is that(I know nothing about boat building), just curious?
The dyvinicell also will not absorb water , this can be a problem with balsa around hull penetrations.
__________________
SeanSunseeker is offline   Reply With Quote
Old 10 February 2011, 04:27   #159
Member
 
Cookee's Avatar
 
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Quote:
Originally Posted by SeanSunseeker View Post
The dyvinicell also will not absorb water , this can be a problem with balsa around hull penetrations.
Not a problem as it's a race boat and only in the water for races - if there is any damage it will be repaired immediately.
__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
Cookee is offline   Reply With Quote
Old 04 March 2011, 11:10   #160
Member
 
Cookee's Avatar
 
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Replacement engine mounts for the cast aluminium items - they will be joined together in pairs to stabilise the engine in the boat.



Our new gantry crane - it will lift both engines in at once (engines are under the covers). Two Yanmar BY 260's



The plug for the rear end is almost finished, this will be removed from the boat and turned in to a mould and then the actual part. The seam where you can see the join will disappear when finished. Phantom 19 deck now has its first matt and the seat bases are started.

__________________

__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
Cookee is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 04:32.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.