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Old 10-09-2014 | 11:01 AM
  #165  
OhD
 
Joined: Oct 2002
Posts: 1,160
Received 9 Likes on 6 Posts
From: west hills, CA
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Originally Posted by smcharg
Hi Jason,

I've only played with the 9.89 gears and the different props so far. It's been a busy month with two competitions and me putting on a 3rd this last weekend so I haven't had the time to swap out the gears as of yet. What I have found is that there is almost too much braking with the larger 22" props on the 9.89 gears and, in wind, not enough speed (We are in a fairly windy climate). It's not that the aircraft flies bad slow at all but, in the wind, one must be able to have the ability to fly a little faster. The Contra is so good at keeping a constant speed that the plane does not have as much speed as much as I think I need in the wind with the bigger props. I have full intentions to start experimenting with the 10.33 gears and the 22" props as Tony suggested after the 18th which is our final competition for the year. Right now, the prop package of choice is definitely the 20.5 x 20.5 up front and the 20 x 22.5 in the rear. It seems to be a great overall setup with this airplane vs. the 22" props on the 9.89 gears. I am excited to try the 10.33 gears though. Also, an interesting note, with these props you do not hear the normal "syncopation" that most Contras have at all. It's still a deeper tone but you lose that aspect of it which makes this plane incredibly quiet. I'm not sure what to attribute that to as a matter of fact but I do believe that it is the prop combination and how large and stiff the fuselage is as I think this is absorbing a lot of the sound / vibration. A lot of others have noted the same thing.
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If you want to fly faster you want the lowest gear ratio and the highest pitch, so the 9.89 ratio and 20.5x20.5 and 20x22.5 is a good combination vs. the 22x18 and 22x20 that many guys are using. What is the pitch of the 22 inch props Tony is talking about?

Jim O