Fin shape is nominally that of (similar to) a Mach 2 kit from Wildman. Have you considered getting the kit? It might save you some $ in the long run.
https://wildmanrocketry.com/products/mach-2-rocket
sorry for taking several months to respond, but i guess its time i revive this thread.
i thought about getting a kit to do this but then decided that sounded less fun than if i did everything myself. sure i'll probably waste more money this way but if i eventually get everything to work of my own design then it'll be a better sense of accomplishment, and i figured i'd learn a lot more this way.
as far as updates to the project, launch that was targeting today (nov. 18) has been scrubbed and i'm not sure when the launch will be, we'll see how it works out with my now very busy schedule and other hobbies. the rocket is done-ish, but i'll probably do more with it in the meantime to make it a little more robust.
for this build, i wound my own fiberglass body tube, which was a first for me. it turned out well though i think. it has a 2 layer 45 degree 6oz fiberglass layup on the fins currently, but i'm considering re-doing the fin can in carbon fiber now that i have some.
RASAero sims say about mach 2.16 to 13,100ft with typical FAR weather conditions and the latest design iteration. allowing a +/- 10% error margin, this puts the rocket somewhere between Mach 1.94 with an apogee of 11,740ft and Mach 2.38 to 14,400ft. while i doubt the rocket will outperform the sims i suppose there is always a chance you get an over-performant motor and ideal weather.
the goal of the rocket is mach 2 and 2 miles high, and even with a 10% cut from the simulation result it exceeds 2 miles, but the speed does get down to Mach 1.94 if i take off the 10%, but if i get a result like that i might just have to pretend it said mach 2.
Avionics for the rocket are also homegrown because i want this whole rocket to be that (except the motor because EX motors scary + i'm Jr. L1 so i can't make them anyway), they are being done with some help from Walter Lohmueller. he's making a flight computer of his own that i will fly on the rocket, as well as my own altimeter. and just in case both of those fail, i'm thinking of having an RRC2+ as a backup to the backup.
I'll add pictures of the rocket here later if i remember to.