I am finding some cut offs here is a piece from the stringer This is 1" Corecell A-600 with 8-1808's Infused with the Ampreg 22 Epoxy laminating Resin,There is a viscosity problem using this in place of a low viscosity Infusion Epoxy but testing told me I could flow the resin front 14+ inches in 18 minutes. and I had a well trained Bag crew.

The Avatars are what Steve2/Wilson Did when we were doing another big thread on the Cats.

Steve2/Wilson at Apache Handled all the design ,cad work along with the website ,clothing line and everything else Imaginable.

I will generalize here about determining shape and depth of the bottom vents.

My first Cheetahcat Cat remember, there were no programs back in those days, I did some basic calculations on like a thin sheet of air being pulled down the bottom (I had to start somewhere) as the speed increased likewise the Air velocity and airflow cfm (I used this number I thought was close)until you have a Cat 3 or better Hurricane blowing under there .

now once you have a Number it is easy to find our needed vent size so to say, I made a 6" deep foreword vent on this boat if I saw a problem would have been a simple operation to open them up a even more. I spent so much time working on the Cat tunnel trying to get it balanced on paper I was talking to myself. Here you can see how close this thing is The steps on that were @3" high by what the numbers said I was very close.

http://www.youtube.com/watch?v=h1csGLgX4tk

since these boats were a cigarette basically and the strakes do not run parallel with the keel and water flow they kinda toed in at the transom which I corrected on the Hull plug as well.

asked about the corners of the stringer sample;that would be maybe an inside corner which is why we use fillets there. the corners would need rounded to a minimum of a 1/4" Radius for hand contact lamination, This was infused and the Glass was quite happy, 4 layers of 1808 would have been enough but there were 8 in here.

Now where the stringer to hull junction (inside corner) there was 45 Degree Fillets placed on each side of the stringer and the lamination was extended out onto the hull 12 inches the longest one being the top layer they were feathered back the shortest which extended out 4 inches the three stringers including the high density 2 inch wide engine bearers were done one shot.

I was asked a question on my Cheetahcat 36;our target was 90s with the 200 Mariners and that race was the testing LOL !! there was not an opportunity to dial the thing in as we were out of time,We had throttle left on those guys.

I have more photos on Thad's stuff that I am getting in and will finish this in a couple days then on to the Cat's thank for the interest, this is bringing back some good old memories.

I was asked about a curved transom and this is my answer;It is a matter of the numbers (Just for conversation here, not reality )say the flat transom has a value determined to be 1000 and a curved panel is 1250.

and the maximum imposed load was found to be 250. so one is 4 times and one is 5.

I use everything SP/Gurlit sells and they offer a Nice high density material suitable for transom use as do a lot of suppliers like the Coosa blue water 26

As for analysis , Usually I always do my own plate work and have the numbers checked, you then back that up with coupons made in the your "actual work area" that are sent into the Lab or nowadays a panel and use the Hydromat it even has a ASTM number attached. Understand when I started all I had in those days was a Radio shack calculator and a slide rule, my printer was a #2 Pencil and a legal tablet the electric eraser on my drafting table was a God send.

If I had the Programs that are around today and the FEA/FEM ability could have shaved a lot of weight out of that first cat ,Understand back then I was in The Nowhere/Cant be done land and making the rules as I went so to speak with that boat.

I have done Carbon modification work overseen By High Modulus in New Zealand in the past.

another on the curved transom;I would insist on it if there were time constraints Reason: everything has to have a flat mounting area ,now given time provisions could be made like Pads built for the drives and tabs ,funny you said that Wilson had a way cool drawing we were playing around with it had a lot of shape to it and he had a knockout idea for the exhaust as well.

This was an answer from Steve 2/Wilson;That video is not as impressive as the boat itself....if you consider the weight and the speed, in rough water, most people can't even comprehend - SERIOUSLY, watch the rough water running, the attitude and the performance...unbeatable!
http://www.youtube.com/watch?v=oGh-PTN_Pek

think about the triple engine boat in this video, its about 1/3rd the weight of anything else, LESS POWER, and its running faster IN ROUGH WATER, than anything else...just think of a Cheetah Cat designed to run against a Mystic...let the mind wander!