Off Grid Gecko
Well-Known Member
Hey guys, of course I've read a bunch of threads on this but reading is one thing and doing is something else.
My OpenRocket simulation says I'm getting 0.8 cal stability on my current L2 build. Rocket is a 4in Madcow DX-3.
I've been checking weights as I go and adjusting the proper parts for weight as I add epoxy and primer. I knew the nose weight would come in close but now it's looking like 2oz of nose weight to get me over 1cal... As far as I can tell by balancing parts, the CoG is coming out right to well within 1/2 an inch. I don't have the motor yet so can't check everything (and of course paint has not been applied yet).
I've never had to add weight, but I have plenty of shotgun shells I can open up to get enough lead. Trap loads mostly and I don't really shoot them very often, just have a bunch that I inherited. I think I can get the epoxy and lead mixture in there without making a mess, just going to be a lot of spot measuring and weighing as I inject each amount to make sure and get it right. Dipping in water is also not a problem... my problem is securing it.
I can drive to town and get a dowel rod, I've just never had to use this method as I almost exclusively bash kits or build from scratch. This is my first high-power kit and been saying since I got it that it needs a longer forward tube, but I'm a little late in the game now to order a 24" tube and redo everything, and honestly don't feel like waiting on it to ship. I have some aluminum heavy-gauge fence wire I guess I could use, I'm just not thrilled about the prospect of cutting and sanding it close to the tip of my nose cone (but who is I suppose).
I've read in some of the posts about this Gorilla Glue trick with making foam by adding some water. Curious how that works. Exactly which bottle of GG I need to get, and how much I need to fill. This is a 4x16in nose cone so it's a lot of space in there. I'm not overly concerned about adding too much weight as this whole build is primarily for an L2 launch and that's about it, unless I find something fun to do with it in the future, at which time I'm fine buying another nose cone and maybe extending the upper tube or adding a payload bay behind the nose cone for fun science.
Can anyone give me like, step by step gorilla glue method for filling the nose with foam. I can get normal crack filler foam but not sure about two part foam in my part of the world. Local supply is pretty limited on a lot of things, though I could check the hardware stores and see what they carry I suppose. Will be a trip to town either way (the gas cost alone gives me a stomach ache, lol).
I also have not added any electronics, battery, or anything else to the payload bay, but it's already pretty heavy so I don't see weight there doing too much to help me.
I also realize that the 1 cal thing is a rule of thumb and not set in stone, but it's one less question to answer for at the RSO table. I have not done a stability test as again, I don't have the motor yet. Plan to order it near the end of the month.
My OpenRocket simulation says I'm getting 0.8 cal stability on my current L2 build. Rocket is a 4in Madcow DX-3.
I've been checking weights as I go and adjusting the proper parts for weight as I add epoxy and primer. I knew the nose weight would come in close but now it's looking like 2oz of nose weight to get me over 1cal... As far as I can tell by balancing parts, the CoG is coming out right to well within 1/2 an inch. I don't have the motor yet so can't check everything (and of course paint has not been applied yet).
I've never had to add weight, but I have plenty of shotgun shells I can open up to get enough lead. Trap loads mostly and I don't really shoot them very often, just have a bunch that I inherited. I think I can get the epoxy and lead mixture in there without making a mess, just going to be a lot of spot measuring and weighing as I inject each amount to make sure and get it right. Dipping in water is also not a problem... my problem is securing it.
I can drive to town and get a dowel rod, I've just never had to use this method as I almost exclusively bash kits or build from scratch. This is my first high-power kit and been saying since I got it that it needs a longer forward tube, but I'm a little late in the game now to order a 24" tube and redo everything, and honestly don't feel like waiting on it to ship. I have some aluminum heavy-gauge fence wire I guess I could use, I'm just not thrilled about the prospect of cutting and sanding it close to the tip of my nose cone (but who is I suppose).
I've read in some of the posts about this Gorilla Glue trick with making foam by adding some water. Curious how that works. Exactly which bottle of GG I need to get, and how much I need to fill. This is a 4x16in nose cone so it's a lot of space in there. I'm not overly concerned about adding too much weight as this whole build is primarily for an L2 launch and that's about it, unless I find something fun to do with it in the future, at which time I'm fine buying another nose cone and maybe extending the upper tube or adding a payload bay behind the nose cone for fun science.
Can anyone give me like, step by step gorilla glue method for filling the nose with foam. I can get normal crack filler foam but not sure about two part foam in my part of the world. Local supply is pretty limited on a lot of things, though I could check the hardware stores and see what they carry I suppose. Will be a trip to town either way (the gas cost alone gives me a stomach ache, lol).
I also have not added any electronics, battery, or anything else to the payload bay, but it's already pretty heavy so I don't see weight there doing too much to help me.
I also realize that the 1 cal thing is a rule of thumb and not set in stone, but it's one less question to answer for at the RSO table. I have not done a stability test as again, I don't have the motor yet. Plan to order it near the end of the month.