If no airfoil on any....the fins with the least surface area will win out (ellipse).
If a marginally stable model and/or wind and the model has to correct itself....the fins with the largest tip chord will win out.
Overall, the model will go to a lower aoa (=lower overall drag) with larger fin tip chords to stable.
Any of those with a good airfoil will win out vs. no air foil!
I keep refreshing this page hoping you have posted the data.
Curious if #10 went highest AND fastest or if one of the others went fastest.
Very interesting test, looks like it was a lot of work.
Dying to see the results.
Interesting! the down swoop (4) was fastest but 63 ft. short of highest. The up swoop (10) was highest and only 1mph short of fastest.
Were the numbers you averaged pretty close?
I would have expected 9 to do the best just because it extends the least distance from the body tube but it was just in the middle of the bunch.
They look square in the picture.
Very interesting test and I hope his son wins at the Science Fair but I think this shows there are more variables involved than shape. Numbers 1,6,and 7 are very close to the same shape but 1 was lowest and slowest and 7 was only 8 ft. from the highest and 1 mph from the fastest.
Best thing about the test.. They got to launch 30 Rockets !!!
Interesting results. I would like someone to attempt an explanation as to why the crazy shape of #10 did best, while elliptical fins (#1) did worst by a wide margin. Not what I would have guessed, that's for sure!