jacquesmm wrote: ↑Tue Sep 14, 2021 3:04 pm I am glad to hear that you like your TX18 but can we have a performance report and some pictures?
Some of your questions are easy to answer, others not.
Let's start with the easy ones.
Scale by 7%: no problem at all.
Raise the sides 4 to 6" easy, you can do that.
BTW, we can talk metric, 10 to 15 cm is fine.
Raise sole for storage: yes, as long as all the framing is present and is raised the same way.
More HP: not ideal but the transom can take it. Trim at rest may not be nice but it is possible. We will have to move tank and battery for the CG.
Foam core: no problem at all if you make the bottom from plywood epoxy. All other parts can be made in foam sandwich and I can give specs.
I can give specs for the bottom too but I will consider them experimental. You may have seen the debate about the PH22 in foam. The TX18 does not slam as much as a low deadrise and with the proper foam and resin, there will be less risk of shear failure than with the PH22.
Your problem is one of supplies: how easy is it to get supplies in Zambia? BBC can ship in a container, we have done it a few times.
Strakes: I don't like that idea. You know that the boat hull shape is based on the Hickman's sled. Hickman and others designed many hulls in that style and in some cases, there was a problem with chine tripping. For that reason, the last Hickman's design and my own have those small slanted chines. Strakes could be dangerous and I don't think that they would reduce blowouts. Blowouts may happen in turns with the TX18 and with tunnel hulls. In a straight line, the flow to the prop is steady, regular but in turns, you will always have turbulences and the only way to avoid blowouts is to take wide turns.
Did you try different height settings?
Hi Jacques. I have lofted the boat +10% all round. I have also found mycell 40, 60 and 80 in South Africa as well as Corelite 450. If you have the time could you please help me with advice on the type of core to use and laminating schedule for the sole. Could you give me your thoughts on using the Corelite 450 for the transom? If its useable do you ahve a laminating schedule for it? Thanks very much!