Apogee fin shape experiment build
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looking good!
Lots of balsa to finish!
Lots of balsa to finish!
Good stuff. Wouldn’t mind seeing the results when finished if you’re so inclined (after the fair of course)
Sure I’ll post the results
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!
A cool project no doubt!
Kooch
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!
A cool project no doubt!
Kooch
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Airfoiling vs not definitely a factor
Also wondering how much "finishing" affects drag
Rough balsa
Sanded balsa
Papered balsa
Filled balsa
Nathan-ized balsa.
Also wondering how much "finishing" affects drag
Rough balsa
Sanded balsa
Papered balsa
Filled balsa
Nathan-ized balsa.
I was curious about this too. I was wondering about square-edged fins vs. rounded edges vs. airfoils.
Zeus-cat
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Excellent.
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Cool!
With ten different flavors, how many flights are you doing on each to get statistically relevant data?
I really like #10!
With ten different flavors, how many flights are you doing on each to get statistically relevant data?
I really like #10!
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Be sure there is a vent hole so altimeter reads right
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.
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.
Took the average of 3 flights
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.
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.
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Are all the edges square?
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 !!!
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!
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