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  #31  
Old 02-14-2019, 09:26 PM
Blackfin26 Blackfin26 is offline
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Never saved any pics. I did talk to him about purchasing and thought long and hard about it. Hesitated a week and off to Hawaii it went.
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  #32  
Old 02-15-2019, 09:00 AM
Bigshrimpin Bigshrimpin is offline
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I found this from way back. This was the Kama II setup.

https://www.youtube.com/watch?v=ln3Y1A_RNCM&t=4s

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  #33  
Old 02-16-2019, 08:32 AM
cdavisdb cdavisdb is offline
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Fascinating stuff, thanks. Love that vid. Notice how dry the hull stays dry, even when digging into the wave in front? It helped me see why my boat is so dry in almost all conditions.

What was used for a platform to video? Must have been BIG to be so stable and fast
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  #34  
Old 02-16-2019, 09:53 AM
Blackfin26 Blackfin26 is offline
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Classic video of that 25 running. I just noticed it has the 3 bottom strakes like the 23 has. One must have been added (the longest one running to the bow) along the way? Other 25's just have two like the older 20's.
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  #35  
Old 02-16-2019, 10:33 AM
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Islandtrader Islandtrader is offline
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I know I posted this before ...but since we are on the subject of the 25' people might find this interesting....COMPARING 25 TO THE 21

Cleaning up my home messages and wasn't sure if I answered you. The boat is up and running and we have ventilation problems with the outboards that Jamie positioned somewhat between the keel and mid hull panels. Next week we're modifying the outboard bracket to move the engines furthr apart like I've seen on some of the old photos. We think if we clear the riser between the keel and mid hull panels we will see cleaner water. To counter the weight of the Armstrong bracket and twin Suzuki 140s, we've had to put 500 pounds of chain in the bow to get her to balance right. She runs great in a head sea, plunges a little too much to my liking in a following sea. Overall, very good forebody but not as good as the SeaCraft 25'. It probably could use more flare in the bow and a big spray rail forward between the chine and keel. What realy surprised me is how softly she landed when launching off 3' foot chop on top of 4' long swells. Considering the average deadrise is about 20 degrees compared to the 26 degrees of the SeaCraft 25', she is almost as soft!

The 21' is quite impressive and with the mods we've made to the 25', including a production 30' based on a geosim of it, it is obvious Moesly was a great designer. We are working on a high seakeeping 24-26' RIB with high displacement of ~ 8500 lbs. Based on our tests on the 25', she simply tops out at a displacement of 7500 lbs so it does not make a good parent craft. I was thinking of stretching the 21' to about 24.5' and was curious about the differences between the 21' and the Potter 23'. I have limited experience from riding the 23' over 30 years ago and as best I remember it wasn't that impressed with the ride and remember getting soaked. I need to know more about the 23' to see if stretching the 21' will detract from her seakeeping.

We have used a digital camera and 3d software to create a very accurate solid model of the 21 and 25 and the differences/similarities are amazing. If you keep the keel panel of the 21' as the baseline parallel to the static waterline, the mid and outer panels slope down as they move aft, about 1.5" over 6'.

Anyway, didn't mean to go on so long BTW, the serial # of my 21' is 111.

Regards,
Big Fluke
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  #36  
Old 02-16-2019, 02:03 PM
Bigshrimpin Bigshrimpin is offline
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  #37  
Old 02-16-2019, 02:15 PM
Bigshrimpin Bigshrimpin is offline
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Quote:
Originally Posted by Blackfin26 View Post
Classic video of that 25 running. I just noticed it has the 3 bottom strakes like the 23 has. One must have been added (the longest one running to the bow) along the way? Other 25's just have two like the older 20's.
20 and 25's all have 3 separate planing surfaces




The only seacraft's with 2 planes were the later 25ft+ racing hulls aka. "my racing machine".
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  #38  
Old 02-16-2019, 02:57 PM
Blackfin26 Blackfin26 is offline
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Big go back to the video of the 25 running with bow exposed. It has 3 strakes plus the extra chime piece added on. The pic above only has 2 strakes?
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  #39  
Old 02-16-2019, 05:45 PM
Bigshrimpin Bigshrimpin is offline
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yup . . . Those were add ons by bigfluke on KamaII. They also experimented but adding small steps in the hull (not shown in any pics) and gained a LOT of speed from what I understand.

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