I tested the venturi pipe again it is again good.
I am planning to give away 2 pieces of venturi pipe to this site for test purpose.
#1. If you have any interest, please post a follow up.
#2. the Receivers must agree to test on their tent stove
#3. Testers can post testing result here, good or bad
#4. Testers need to drill a hole of 1" on bottom of stove, just beneath the outlet of chimney
#5. again pictures. 8 pieces of AA Alkaline battery can drive the blower for 10+ hours. Length of pipe 8" inches