That video is Jerry O's 7.5 inch two stage iris .Right at my own club! Hmm, maybe I won't build one. :eyeroll:
Oh, then not full-scale.That video is Jerry O's 7.5 inch two stage iris .
Here is one of the four fins from my full scale . They are made from 1 inch blue foam board hot wired to shape . The orange is 1/4 inch oak . There is 3 layers of 5.5 oz glass covering everything . The fin tabs are full length and have not been cut down yet . Still trying to decide on the final motor mount configuration .Oh, then not full-scale.
Cool. Are you doing a build thread?Here is one of the four fins from my full scale . They are made from 1 inch blue foam board hot wired to shape . The orange is 1/4 inch oak . There is 3 layers of 5.5 oz glass covering everything . The fin tabs are full length and have not been cut down yet . Still trying to decide on the final motor mount configuration .
Eric
Edit . the pink line is a 12 inch ruler .
Eventually I will post a thread when it is done . The rocket is ultra-light weight . The rocket is on track to be between 37 and 42 pounds loaded without the motor .Cool. Are you doing a build thread?
ULTRA-light is right!!! Wow!Eventually I will post a thread when it is done . The rocket is ultra-light weight . The rocket is on track to be between 37 and 42 pounds loaded without the motor .
Eric
The main structure of the rocket is comprised of hot wired blue foam with a final wall thickness of one inch . The OD of the tube is 12 inch with a ID of 10 inches . I used a single 3 inch thick 4x8 sheet for every 8 feet of airframe . 3 sheets for the entire rocket. Two layers of 5ish oz S glass covers the rocket . The nose cone is layer tapered from two layers up to 4 at the tip . The fins each have 3 layers. Each fin is right around 500 grams before trimming , should be down below 400 when all trimmed to the final size . There is far to much to try and describe via typing without pictures to go along .ULTRA-light is right!!! Wow!