John Barker opined, "...from all I have read it is almost unheard of for
bought propellers too have too much pitch - it is usually the opposite..."
John, you're generally correct with this assumption, but the Ikara plastic
props from the Czech Republic often come with excessive pitch built in.
These propellers are the airscrews of choice for our Wright Stuff Science
Olympiad event whose rules specify the use of "a single two-bladed
commercially made plastic propeller."
Two or three years ago I was helping mentor a team of middle school students
who were to compete in the Wright Stuff event. When their models were
completed we mounted the Ikara props provided in the kits. The pitch was so
high that the props provided almost no useful amount of thrust. On the spot
I took two pairs of pliers and twisted the prop spars for a eyeballed lower
pitch. Voila! The models immediately were flying in a normal and successful
manner.
Bob Clemens
Received on Sun Jan 21 2007 - 08:05:38 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:44 CET