Ballistic Parachute Test. 60% Fail > 100% Fail
At Maker Faire, Chris said auto-land is a hard problem. While I don't have much to contribute to that yet, I did want to try deploying a ballistic parachute mid-air to bring a plane down. A few others have shared successful parachute systems before.
So obviously the parachute shock cord just ripped straight out. The lesson is you can't use that simple paper shock cord mount design you glued into little model rockets as a kid to slow down a 3 pound Bixler mid-cruise.
I am kind of surprised that the ignitor circuit worked on the first try, and that the Sugru + masking tape tube mounting held!
I was also surprised at the pitch moment; I guess I could have computed it beforehand. I didn't think the rocket's moment arm against the vertical CG would cause it to flip forward that much. Also, the parachute was slightly burnt. I should switch to that "dog barf" fiber insulation instead of using recovery wadding.
Here's the pre-fail overview.
If I get around to finishing a lighter and more reliable parachute deploy, I might try using my MaxSonar to detect an approaching object (like the ground) and deploy it automatically.
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Developer Comment by John Arne Birkeland on May 22, 2012 at 5:44am -
Brian, you could use elastic rope to dampen the quick deceleration if the cute is deployed at speed.
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Comment by Bradley J Carr on May 22, 2012 at 6:43am -
Not to spoil the fun with rocket engines and maybe making a blasting cap of some sort. But, if you don't have to use the blasting part of it, wouldn't it be better to make something with a pin and spring of some sort? I am looking at the point of if something goes wrong and the blasting cap or the rocket engine happens to malfunction and ending in burning of the airplane and electronics. or it blasts and disables the plane from landing. To me it seems as if it is a risk.
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