Straight bottom Cig lifting strakes
02-17-2019 | 12:50 PM
#13
Thread Starter
Registered
Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
Prob also why the cigs ride so nice. 14ft from the transom theres nothing but a smooth vee . Minimal horizontal surface to land on off waves.
02-17-2019 | 03:34 PM
#14
Platinum Member
Joined: May 2012
Posts: 11,425
Likes: 3,953
From: Midwest & T-Rock
Dan didnt extend the inner strakes. First, he had someone remove some of the outer strakes, in therory to let the transom settle. Then he had them put back on, and did that tres martin wedge thing. I think the wedge helped the porpoise.
Speedy, the measurement i am speaking of, is if you take a tape measure, and measure from the transom edge, to the end of the inner lifting strake. the longer the distance, the less strake you have.
Speedy, the measurement i am speaking of, is if you take a tape measure, and measure from the transom edge, to the end of the inner lifting strake. the longer the distance, the less strake you have.
the distance where there is no strake 
02-17-2019 | 04:41 PM
#15
Gold Member
Joined: Oct 2005
Posts: 11,688
Likes: 216
From: Olmsted Falls,Ohio Marblehead,Oh
he said 14' from the back of the boat, he is asking if a longer inner lifting strake would make the boat ride out of the water more and less of a wetted surface, the short answer is hydro dynamically speaking, yes it would, but being as the boat would be riding higher the propensity to chine walk and fall to the sides instead of down in the front would be more, also with a longer lifted surface it would change the X dim slightly. I dont think that it would be hard to do, didnt Dan do something like that on his?
02-17-2019 | 08:36 PM
#16
VIP Member
Joined: Feb 2004
Posts: 12,314
Likes: 1,556
From: Maryland
rocker is different, a rocker hull is like a "rocking chair" that is designed to allow water to travel up to the drives. and certain cig hulls have it and some don't, many hulls with notch's have none. strakes channel water in a specific direction to achieve lift and aren't displacement type hulls. strakes are designed to work under pressure with speed, as joe had mentioned the lifting strake ending at a certain point stops lifting, to extend it further back it lifts more and would raise the hull further based on speed achieved.
02-18-2019 | 03:27 PM
#18
Registered
Joined: Jun 2009
Posts: 9,961
Likes: 6,444
From: Chicago
https://youtu.be/L-LxiVwnlzc
This straight bottom 38 scarab had side by side 850-950hp blower motors, #5 drives. Boat ran 108 if i recall.
This straight bottom 38 scarab had side by side 850-950hp blower motors, #5 drives. Boat ran 108 if i recall.
if you stop the vid at :16 it looks like the water starts where the strakes end. (further back then any straight bottom cig.)
If there was a way to add temporary strakes I`d try it.
I`d also like to try lowering my extension boxes vs. putting a spacer in the drives.
02-18-2019 | 06:39 PM
#19
Registered
Joined: May 2009
Posts: 3,895
Likes: 124
From: Chicago, IL; Onekama, MI
The Scarab 38 hull is also a rockered hull as is the Scarab 43. Larry Smith built a non-rockered 43 for Tom Gentry, and it didn't work well at all. That was the first 43 built. I believe they added 3-4" of rocker to that boat to get it to run well. As to the inner chines, not only are the Scarabs longer, I was also told they are wider than that of a 38 Cigarette. So not only does it get better lift, it also makes it more stable. I would also measure the width of the inner strakes between the two boats. If I remember right Larry Smith race Scarabs and production Scarabs had the inner strakes in different locations. I think the race version had them placed closer together.
02-18-2019 | 06:41 PM
#20
Registered
Joined: May 2009
Posts: 3,895
Likes: 124
From: Chicago, IL; Onekama, MI
I think Rookie made some temporary strakes for his Panther. PM him and see what he did.
