Discussion in 'Low Power Rocketry (LPR)' started by bikefxr, Feb 17, 2019.
My sons science fair project taking shape
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!
Airfoiling vs not definitely a factor
Also wondering how much "finishing" affects drag
How are you measuring altitude? I recommend sticking to just a few variables and flying them multiple times on the same motor. Motors can be + or - 10% in thrust
We are using a jolly logic altimeter two for speed and altitude and multiple flights
I was curious about this too. I was wondering about square-edged fins vs. rounded edges vs. airfoils.
Ready for flights tomorrow
Awesome that looks like a lot of fun! Don't forget your son can submit his project to NAR and potential get a year free junior membership
With ten different flavors, how many flights are you doing on each to get statistically relevant data?
I really like #10!
Be sure there is a vent hole so altimeter reads right
Was doing 3 fights with each the vent holes were already in the payload bay
#10 went the highest 424 feet fastest went 108mph pulled 9.8 gs at lift off used a Estes C 6-5
I’ll post the rest of data later that’s all I could remember
Separate names with a comma.