trogdor
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So I've been wondering about the various limitations placed on an uncertified (level 0) flyer at a NAR launch. What is the maximum total impulse possible while staying within all boundaries set by all rulemaking entities?
Let's assume an adult flyer (age 18+) using commonly available and certified motors with any required FAA notification having taken place and a rocket within liftoff weight restrictions.
As I understand it:
By NFPA 1127, a single motor can have no more than 62.5g of propellant and must have an average thrust of 80N or less.
This makes the Aerotech G64 and G80 pretty much the limits of these rules respectively.
By the NAR model rocket safety code, the rocket will not contain more than 125 grams (4.4 ounces) of propellant or 320 N-sec (71.9 pound-seconds) of total impulse.
So, what clustered combinations get you closest? Playing around a little, a G80 and a couple F50s are within 10 grams or so of the weight limit but only 260 N-sec. I'm not sure how much closer you can get to the impulse limit while staying within the propellant weight limit but blue thunder propellant seems to be the most efficient.
Any ideas? Creative thoughts (512 1/4As?? )
Let's assume an adult flyer (age 18+) using commonly available and certified motors with any required FAA notification having taken place and a rocket within liftoff weight restrictions.
As I understand it:
By NFPA 1127, a single motor can have no more than 62.5g of propellant and must have an average thrust of 80N or less.
This makes the Aerotech G64 and G80 pretty much the limits of these rules respectively.
By the NAR model rocket safety code, the rocket will not contain more than 125 grams (4.4 ounces) of propellant or 320 N-sec (71.9 pound-seconds) of total impulse.
So, what clustered combinations get you closest? Playing around a little, a G80 and a couple F50s are within 10 grams or so of the weight limit but only 260 N-sec. I'm not sure how much closer you can get to the impulse limit while staying within the propellant weight limit but blue thunder propellant seems to be the most efficient.
Any ideas? Creative thoughts (512 1/4As?? )