I am making some progress on the 4" Viper as described in post#1, but I nowhere near as fast as Frank in building. I still need some parts to come in. So far the weight is not bad, only 23.3 oz for the parts shown in the photo's. The turbo tubes have not been glued in, yet. I am currently planning to use the Estes 4" MDRM tube at the top in order to avoid sanding the nose cone. The coupler for the BT-101 fits both the BT-101 and the Estes tube. The MDRM tube weighs a little bit more, but I plan to use the G40 motor, which requires a little bit more nose weight. I got all the measurements from Frank's photo's. I feel good about the measurements, because I get a total length of 42.65" versus Frank's total length of 43".
I found that my old can of 3M spray adhesive is very tricky for attaching 6 mm depron. I need to spray very light or it will melt the depron. Also, the can says wait for the adhesive to get tacky. I have found no such problem. It is immediately tacky. In fact my depron sheets have got to be aligned as close as possible, because once they go together there is not possibility to make corrections. The depron parts are stuck.
I found that my old can of 3M spray adhesive is very tricky for attaching 6 mm depron. I need to spray very light or it will melt the depron. Also, the can says wait for the adhesive to get tacky. I have found no such problem. It is immediately tacky. In fact my depron sheets have got to be aligned as close as possible, because once they go together there is not possibility to make corrections. The depron parts are stuck.