5/26/2023 0 Comments Editready mojaveThe lift-off thrust is the average thrust over the first 0.3 seconds of the motor burn, and the lift-off impulse is the average thrust over the first 0.3 seconds times 0.3 seconds. ![]() Thrust is a force, and the total impulse is the product of the average thrust times the burn time. As I understand it all I need now is to notify them for a NOTAM. With the heaviest "G" motor installed it with be 51.3 oz or 3.2 lbs. Good point on the FAA but I'm going to come in just under the 3.3 lbs or 52.8 oz's to put me in the upper HPR range. I was pretty sure which to use or not use and was trying to confirm it here. To answer an earlier post, I will be able to fly it I'm just making sure here which motors not to attempt to launch with. I intend to later fly it on larger motors after the camera is installed which is the reason for the mods. I also added removable rivets to the coupler/lower body tube and to the nosecone to upper body tube to be able to remove them later when I add a camera. I installed my own PMR in the form of 3/32 ply with 4/40 screws and blinds nuts. All of this was connected with quick links. I also swapped out the composite forward bulkhead and screw eye for a 3/32 ply and u-bolt.(Suprisingly it was lighter than the composite bulkhead and screw eye the kit came with.) I went with 12' of 1/4" Tublar kevlar,5' of 9/16 Tubular nylon and a small piece of the original 5/8" elastic attached with a swivel to a 48" Sperachute with a kevlar chute protector. I replaced the coupler with a longer and thicker (8") one from GLR using the existing one to beef up the rear tube aft of the motor. The extra weight is mostly in the area of the coupler for the upper and lower body tubes from the following mods. The CG is fine and right where it should be about 8" in front of the CP (CP is 46" from tip of nose and CG measures 38" from the tip.) My research agrees with you that the G64 is the smallest I should attempt. Maximum range from launch site: 324.97308 Ft. Minimum velocity for stable flight reached at: 72.6686 In. The launch guide was cleared at : 0.284 Seconds Velocity at launch guide departure: 43.8546 ft/s Maximum range from launch site: 116.08646 Ft. Minimum velocity for stable flight reached at: 97.7512 In. The launch guide was cleared at : 0.325 Seconds Velocity at launch guide departure: 38.0247 ft/s ![]() Maximum range from launch site: 109.88178 Ft. Minimum velocity for stable flight reached at: 156.3618 In. User specified minimum velocity for stable flight: 43.9882 ft/s The launch guide was cleared at : 0.396 Seconds Velocity at launch guide departure: 30.5184 ft/s ![]() In fact, the G64 might be boarderline depending on the exact weight at launch and the location of your launch lugs. I would not fly your rocket in anything less than the G64 you have listed and even then only with no wind. I think the advice you have been given so far is very poor.
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