# 5" rocket weights

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#### Neil

##### Well-Known Member
Could anyof you tell me how much a 5" diameter by 75" long bird should weigh? I am designingone like that and I am trying to decide if it is practical or not. sims show it at abou t25OZ (stupid material database....), whichI know isnot right. I put it up to 100 OZ, but I am still not sure if it is enough. Thanks guys. -Neil

#### Ryan S.

##### Well-Known Member
depends on alot of things. Is it glassed? What is the nosecone made of? What are the fins made of? Is there nosweight? What size motor tube? How thich are the centering rings? Does it have electronics? etc etc etc

#### Neil

##### Well-Known Member
Will most likely be glassed with 6 OZ fiberglass, will have a glassed foam cone, 75MM motor mount, just so it can handle Ks when the time comes, I am thinking quarter inch or half inch aircraft plywood, and there will proabably be a 2 pound noseweight, but less once I tweak the design to make the thing more stable.

#### Neil

##### Well-Known Member
Heres a sim for it.

#### Neil

##### Well-Known Member
OK. Thanks. I just set it to #20, and it is recalculating all simulations asI write. Thanks. -neil