Activity

Another material I have used besides cardboard is foam board. You can get it 20″ x 30″ in many arts and craft stores and sometimes as large as 30″ x 40″ in office supply stores. It is very rigid. I…   Read more»

Warren,Got it, easy to do, and it will save me a LOT of time. I ordered 8.9 oz. fiberglass cloth. As you said earlier in another post, and were you right!, carbon cloth is really hard to get ahold of…   Read more»

Bruce,First you mark your center point, then you draw out your 120 degree (or 90 degree) centerlines, then you draw your circle for the airframe, then you draw a line on either side of those centerlines you drew 50% of…   Read more»

Thanks, Warren. You know what rocket I’m talking about. This is why I posted. I was going to use wood, or masonite, and that’d be a pain. Listen, I really appreciate this from all. Thanks!

Agreed. So both of you feel that cardboard is stiff enough to give the fins good support? Chris, you said 120 degrees. I agree on that, too. But you have to account for the diameter of the fins; in other…   Read more»

Most of the folks I know use cardboard ones. I have a rough set of them for HPR tube sizes made from regular corrugated box cardboard. They are easy to replace and you can lay them out perfectly with an…   Read more»

Cardboard templates – 2 of themCut a 5″ hole in it, with 3 slots radiating out from the hole, 120 degrees apart. You then line up the two templates with each other on the fins – perfectly straight, perfectly aligned…   Read more»

Well on my 5.3 inch denali we used wood because I really wanted them to be straight. But now I used cardboard on my 54mm rocket and it workes perfectly. Depending on money and time I would say wood is…   Read more»

Sorry I missed ya Conway. I had planned on staying up for Sunday, but I was exhausted and the bird I’d planned on flying on Sunday had a really nice bounce from a flight to near 10K when the main…   Read more»

W,Thanks, I’ll see what I can do.J

You get Mike Bennett to send me their calender and James Russell to send me the Tripoli Colorado calender and I’ll mix ’em in with ours and post ’em.Warren

warren,Is there a way to append the CERG launches to the NCR cal, I was out of town (in SF at the annual Haight street festival–now that was wild!) but so enjoyed the one held last nov, don’t want to…   Read more»

Sadly The Fire BAn is or will be in affect here pretty soon so i assume that was the last launch for a while

Sorry I missed ya Conway. I had planned on staying up for Sunday, but I was exhausted and the bird I’d planned on flying on Sunday had a really nice bounce from a flight to near 10K when the main…   Read more»

Yea It was way fun!! great turn out and Nice flyin weather. I loved it. First rockets ive flown in 3 years. it was also great to see some familar faces and meet a couple new ones. I must say…   Read more»

Sounds great, and I really wish I could have made it :(If anyone got any pics, I’d love to see them.

Like I said, I have the 835cc tank. This would extend me down into the lower powered J’s, give me a spare valve and 2 fuel grains… Next build session for the Uproar, bring it down with you so I…   Read more»

Yes it can become a K240 but it is the 440 cc tank.

I’ll consider buying it. I have the 835cc tank and it sounds like you have 435cc tank. Those grains will also be a K240 with the bigger tank and the smallest orifice.Warren

BSchaefer wrote: Absolutely, J! I remember an IBM 360 that took up a house, and you had to punch the program on cards! But that was then… 🙂 I worked out Barrowman’s CP calc in Excel. Doesn’t agree with modern…   Read more»