joshismycaptain
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You may already be aware that a rocket with a "lift-off-weight" of more than 1500 grams is considered "high-power" and requires the flyer to be HPR certified REGARDLESS of the size of the motor.
I'm doubtful you could lift an 8" tube with a single G80 motor. If you build a single motor tube, and without a cert, you are limited to just one G80 motor as the most powerful... You can fly a rocket with a "cluster" of TWO G80 motors to provide the maximum power. This is still allowable without certification.
Two G80's weigh about 260 grams, leaving you 1240 grams for the rocket and recovery gear. The questions now becomes... Can you build a rocket with an 8" concrete form tube that weighs no more than 1500 grams ready to fly???
The attached pdf should help show where HPR cert is needed.
I know that now. I did not realize that however at the start of the project. So here's my official plan : Build one short and fat rocket (perhaps a large scale Big Daddy) that meets MPR criteria. I will use the 29mm mount and retainer I have left over from my 38mm Argent. Then I will use the remaining tube and plywood to create a larger rocket that will be standing by for after I've completed my L1, and will make a good static model in the meantime...
Josh
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