Level 1 certification kit

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fluky

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So I plan on getting a binder design excel for my level 1 certification. I'm looking for RockSim data for OpenRocket to test some motors and I found 2 files but they are about 400 grams off from eachother and I'm not sure which one I should use. Also I went ahead and tested a H123W motor in one if them and the thrust to weight ended up being 9:1, is that ok?unknown.jpeg
 
So I plan on getting a binder design excel for my level 1 certification. I'm looking for RockSim data for OpenRocket to test some motors and I found 2 files but they are about 400 grams off from eachother and I'm not sure which one I should use. Also I went ahead and tested a H123W motor in one if them and the thrust to weight ended up being 9:1, is that ok?View attachment 387643
Image should be clearerunknown.jpeg
 
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I can't make out anything on your pictures.
What diameter is your Excel?
For a rough weight estimate just weigh all your parts separately and override each individual component or weigh them all at once and override the entire rocket. That motor in that rocket shouldn't present any stability issues.
 
I can't make out anything on your pictures.
What diameter is your Excel?
For a rough weight estimate just weigh all your parts separately and override each individual component or weigh them all at once and override the entire rocket. That motor in that rocket shouldn't present any stability issues.
Add a little extra for adhesive, motor retainer, etc.
 
Image should be clearer

FYI, the pictures are blurry in both posts. In any case, I wouldn't worry too much about which weight is correct, your built rocket will be different. Build it up and override the weight in OR to match your rocket weight for your sim.

9:1 thrust ratio should be no problem. Personally I don't look at thrust ratio for motor selection, I use the speed off the rail as my decision on whether a motor is good to go or not. 40 ft/s is a good starting point, a little faster if it's windy out. Remember to set the rod length in OR to match what you'll be using.

The looks like a great rocket for an L1. 4" so it won't go too high and plenty of room for recovery gear. Put a Jolly Logic chute release on it and you'll have an easy recovery for a successful L1.

cheers - mark
 
That’s a great rocket. Take care during construction and prep and everything should go well.

There’s nothing to worry about when it comes to the thrust to weight ratio.
 
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