RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Just this last week I was able to get a set of Dave Snow wings in the air with my Contra powered Wind S Pro. These wings were built and covered by Dave himself, so all I had to do was mount them. My immediate thoughts with regard to comparision with the stock Wind S Pro built up wings are as follows:
1/.. Dave's wings are lighter by about four ounces. (113g)
2/.. Exits from snaps are easier to hit consistently.
3/.. Dave's wings are noticeably faster than the stock panels. I'm flying with a set of 22x20 front and rear props and they at least as fast as when I fly the stock wings with a 22x22 rear and a 22x20 front.
4/.. I've moved my CG back about 12mm from where I had it with the stock wings. (I'm still experimenting with this though ..)
These wings are not a direct copy of the Wind S Pro wings. They are replicas of the Spark wings that Dave is building for Andrew Jesky, which are also not direct copies of the Krill Spark wings.
All in all, I am very happy with the switch. My AUW has gone from 5075g to 4910g, (includes swapping out the wing tube as well..) and I figure I'm going to pick up points on all my snaps at least.
Brenner ...