snrkl
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- Apr 11, 2017
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I posted this on the build thread but Im thinking its not gotten eyeballs soon enough to help - apologies in advance for the duplicate post...
Long story short: Shortened apogee aspire with double diamond papered/CAd/Epoxied/epoxy filleted balsa fins going supersonic on a g80 to about 4500ft. Eggfinder mini and A3 in the nose. (Ive flown / lost this before and fin strength isnt a problem at all)
Here is my dilemma:
I grabbed some 29mm 3D printed conformal rail guides from apogee.
I know this rocket is small (510mm) and doesnt need two guides.
Now I cant decide whether I should put the one guide Im using on or behind the CG.
My gut says between the CG and CP (pictured) but Im having trouble thinking my way through the impacts. Ive launched exactly ZERO rockets off a rail so far and even fewer (!!) with one of these rail guides, so inputs are sought and welcome!!
This thing will be launching on a g80 with a ~30:1 thrust to weight ratio - Im less worried about rail length then I am about possibly uneven thrust forces (not sure if Im nuts!) breaking the guide before it finishes on the rail (with the obvious dread/hilarity that would ensue...)
Ill be packing some sandpaper to ensure the rail inside and out are clean (and some wd40 for good measure) but thoughts on where to put this single 3D printed rail guide are appreciated.
Long story short: Shortened apogee aspire with double diamond papered/CAd/Epoxied/epoxy filleted balsa fins going supersonic on a g80 to about 4500ft. Eggfinder mini and A3 in the nose. (Ive flown / lost this before and fin strength isnt a problem at all)
Here is my dilemma:
I grabbed some 29mm 3D printed conformal rail guides from apogee.
I know this rocket is small (510mm) and doesnt need two guides.
Now I cant decide whether I should put the one guide Im using on or behind the CG.
My gut says between the CG and CP (pictured) but Im having trouble thinking my way through the impacts. Ive launched exactly ZERO rockets off a rail so far and even fewer (!!) with one of these rail guides, so inputs are sought and welcome!!
This thing will be launching on a g80 with a ~30:1 thrust to weight ratio - Im less worried about rail length then I am about possibly uneven thrust forces (not sure if Im nuts!) breaking the guide before it finishes on the rail (with the obvious dread/hilarity that would ensue...)
Ill be packing some sandpaper to ensure the rail inside and out are clean (and some wd40 for good measure) but thoughts on where to put this single 3D printed rail guide are appreciated.