The Pro Zinger 14x4 has worked very well in my Jett 76L powered Burrito. There is a significant weight difference between the two props. Here are the results from my digital scale:

Zinger Pro 14x4 = 33 grams (~ 1 1/8 oz)
APC 14x4w = 59 grams (~ 2 1/8 oz)

So, I measure around 1oz difference between the two props. One other observation, the APC hub is smaller so it appears that the weight increase is distributed in the blades. That is important because as the mass moves toward the tips, the spool up will take longer (if I remember physics... it's something to do with the moment of inertia). This link has good (technical) prop info.. check out the summary findings at the end of the article. http://www.geocities.com/CapeCanaver...es/GYROWEB.htm


Later,

TX