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I just tried to order 4 pieces from Madcow. A 2' piece of 3" fiberglass airframe. 2 bulkheads and a 3" plastic nose cone. The shipping costs were quoted as $106. I feel this is outrageous. The airfame is to mate with a fin can that I already have. Can anyone steer me towards an airframe...

Hi Forum, I would like to do a rocketry presentation to a 5th grade class to learn some science and have fun at the same time Can anyone suggest a resource for suggestions on how to do this? Thanks In Advance

Hi, Could some one please tell me how to load a motor into the rocket design I have in Open Rocket. This is a 75mm minimum diameter rocket. I have selected the body tube configutation, clicked "motor", then selected "This component is a motor mount". When I then select "motors &...

Hello, I'm the past I have downloaded a catalog of Aerotech motors and other things that they produce that had a list of all the motors they make. I haven't been able to find that now. I have googled it without success. Could someone steer me towards one? Thanks in advance-

Hello Forum, I believe this subject has been talked about before but I can't come up with it. I wish to fly a rocket with a cluster of 5 D motors. Is there something that can be done to insure a fast, hot ignition of Estes igniters? Something I could add to the igniter? I realize that...

I'm wondering about something. At launches it seems as though other participants are able to fly more rockets than I am. Do you keep seperate altimeters, batteries and parachutes in each rocket? I move these from one rocket to another to keep the cost down. Just wondering- Charlie

I know that it is good practice to twist pairs of wires to mitigate electromagnetic interference. In an AV bay which wires do you do this with? Battery cable, switch wires, wires leading to pyro charges? Thanks, Charlie

Hello all, Warning: Tech dummy posting this. Tim Van Milligan has asked me to send him a file of a design I have created on Rocksim V-10. I dont seem to be able to do this. Is there someone who would be willing to walk me through this? Thanks in advance- Charlie

Hello forum, I have always had a switch band on my dual deploy rockets. I think I started this because I used to use a voltage selector switch mounted on the side of the rocket. I am now using screw switches mounted on the AV bay sled. I cant think of any reason a switch band is necessary...

Hi all, I guess this is the best forum for this question. I am designing an AV bay. Does anyone have a slick idea on how to align the holes in the AV bay tube with the switches on the sled inside? The only way I have done it is by careful measuring with mixed results. Thanks

Hi, I just went to use some Fiberglast 2000 resin and it has gelled and almost wouldn't come out of the can. I have probably had it for 6 or 8 months. Is this now a throw away? Is there anything that can be done to keep this from happening? Charlie

Does anyone know of a fiberglass coupler that is the same diameter as a PML phenolic coupler tube? I know a Madcow coupler is too big. I need a fiberglass coupler that will fit inside a fiberglass airframe tube that has been layed up on a PML phenolic coupler tube. Thanks-

Hi, I rolled my own fiberglass body tube (I'm new at it). The part came out structurally sound but I'm not happy with the surface. In places it looks like the cloth is showing through. I'm thinking I should have put on a heavier coat of laminating resin on the outside before applying the...

I have been using Aeropoxy and Rocketpoxy for structural joining of rocket parts. Is there anything out there that has a low viscosity but is still strong? I'm trying to push this epoxy through a syringe with an 8 gauge dispensing needle on it. Thanks, Charlie

I am wanting to do a fiberglass layup on a 4" phenolic coupler tube to create a 4" airframe. I wondering how to remove the coupler tube afterwards. I would put two layers of 2 mil Mylar between the coupler and the layup but even so I'm thinking it may be hard to slide the tube out after the...

Hi all, Does anyone use anything besides masking tape to close the top of a charge well? I can't think of anything else that would work. Maybe if I did 3-D printing I could make something, but I dont.

I have tried to use the CD that came with the Perfectgloght Stratologger that bought to program a slight delay of firing the apogee charge. I can't get the CD they included to open for some reason. Will someone walk me through doing this? Either using my laptop or doing it in the field, it...

Hi Forum, I am getting set up for future use of my Altusmetrum Telemega. What size mAh lipo battery are you folks using? This would fire two deployment charges then be used for tracking. I suspect many will say, the longer it will run the altimeter the better. Is there a point where enough...

Hi scratch builders. I was installing some steel 1/4 -20 x 2" eye bolts in my av bay this morning. Those darn things are HEAVY! 19g each!! I have looked for aluminium, cant find any. I found some aluminum u bolts but the smallest I found was too big to fit in the 38 mm airframe. Anyone...

Yesterday I tried my first attempt at vacuum bagging fiberglass. I now have some questions. The part didn't come out very good but I'm anxious to try again. I applied peel ply over the 5 layers of wetted out fiberglass on my body tube mandrel,then peel ply, then breather/bleeder fabric. I...