RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
of vortices at the tips of the blades, all of which results in reduced efficiency. Brenner ...
Posted on: 9/18/2012 5:51 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11232900

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Hey Brian, Thanks for the advice. I'll pass it on to Mike. Brenner ...
Posted on: 9/5/2012 9:32 AM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11218320

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Well, sort of. It's kinda under construction right now. As soon as the contest season ends, I plan on getting it going properly... Brenner
Posted on: 9/4/2012 8:11 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11217788

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
the same area now as the current integral rudder fin. Brenner ...
Posted on: 9/4/2012 7:17 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11217737

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
of the increased braking that you get from the Contra. Brenner ...
Posted on: 8/15/2012 6:35 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11195107

RE: F3A Results - SPOILER
that can effectively address the energy tradeoff side of the equation. Brenner ...
Posted on: 8/13/2012 11:15 AM by Author "Brenner" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11191446

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
It looks very sleek. Has it flown yet? Brenner ...
Posted on: 8/12/2012 6:58 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11190955

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
downline. Brenner ...
Posted on: 8/4/2012 8:11 AM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11180659

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
the trailing edge quite thick, and/or add a flaired trailing edge. Brenner ...
Posted on: 8/2/2012 5:56 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11179091

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Hey Brian, Here in North America the AMA rule is 2m or less for AMA classes. FAI classes get the 1% tolerance. Brenner ...
Posted on: 8/2/2012 4:21 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11178988

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
nope...
Posted on: 7/25/2012 7:48 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11169490

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Sound checks are tomorrow. By the way, I made the final in Masters. We fly tomorrow at eight. I did get a courtesy sound check, and I was at 94db. Dave Lockhart flew his Contra all through the prelims, and then switched to his single prop for the semis. He told me that he switched because he hasn't had enough time to trim his Contra powered plane for the double knife edge snap in F. Brenner
Posted on: 7/25/2012 7:13 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11169440

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Thanks Brian, Yes, Chip is flying the Contra. I saw his second round of F about an hour ago. He's doing great! I won the first round in masters, but I had my score zeroed for missing a judging assignment. Right now I'm waiting to fly the last two rounds of masters. Brenner...
Posted on: 7/25/2012 10:31 AM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11168705

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Hey Chip, The polished spinner looks very sharp! I'm looking forward to seeing your setup fly. Brenner ...
Posted on: 7/13/2012 9:31 AM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11153805

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Is there any reduction gearbox between the props and the motor? Also, what size are the props? Brenner ...
Posted on: 7/9/2012 5:19 AM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11148452

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
How does it fly?
Posted on: 7/9/2012 4:28 AM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11148410

RE: Dave Snow Wings/Stabs
..) and I figure I'm going to pick up points on all my snaps at least. Brenner ...
Posted on: 7/8/2012 8:44 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11147508

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
..) and I figure I'm going to pick up points on all my snaps at least. Brenner ...
Posted on: 7/8/2012 12:02 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11147511

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
the weight down in the near future. Brenner ...
Posted on: 7/8/2012 9:13 AM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11147483

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
. Here are some pictures. Brenner ...
Posted on: 7/6/2012 6:54 AM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11145137

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
I have a separate channel, mixed into throttle. I use it to switch the brake on and off for different maneuvers. Brenner...
Posted on: 6/30/2012 5:44 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11138052

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Hey Gavin, The gearsets are color coded with machined dots on the arms of the driveshaft carrier. Each arm may, or may not, have a dot. The code is interpreted as follows: 0 dots - 9.98:1 1 dot - 10.15:1 2 dots - 10.33:1 3 dots - 10.56:1 The ring gears are coded in the same way. Brenner ...
Posted on: 6/29/2012 5:09 AM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11136238

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
;t interfere with the rear prop. Brenner ...
Posted on: 6/28/2012 7:34 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11135868

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
transitions in the air much smoother. Brenner ...
Posted on: 6/28/2012 11:55 AM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11135299

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Hey Jason, We've learned an awful lot since you flew my Integral. At that time we were struggling with yaw stability problems, and the CG was way too far back for using a Contra. Also, the 22x18 props front and rear were very slow, (not a bad thing, just not compatible with North American style pattern flying ..) so I'm guessing that your experience wasn't totally positive. Since then we've done the following: 1/.. Added rudder strips to flare the trailing edge of the rudder. We've found that this really helps planes with yaw stability issues. 2/.. Moved the CG forward upwards of 25mm. This really helps Contra powered planes because there is very little corresponding loss of rolling performance, probably due to the lack of right thrust in the nose. 3/.. Made 22x20, and 22x22 props availble. (APC also has props for the Contra as well now..) Now the speed range covers anything you can do with a single prop setup. 4/.. Gone to airframes with reduced drag. This is because you get all the speed control you need from the Contra Drive, so parasitic airframe drag only wastes mah for the packs. Brener ...
Posted on: 6/23/2012 5:24 AM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11128605

RE: First Annual East Wings Precision Aerobatics Competition
Is the field available for practice on Friday afternoon? Brenner ...
Posted on: 6/21/2012 7:26 PM by Author "Brenner" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11127223

RE: D-4 NATS Tune-up
I'm looking forward to it. I hope Verne is going...
Posted on: 6/21/2012 7:25 PM by Author "Brenner" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11127221

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Yes ...
Posted on: 6/21/2012 1:15 PM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11126868

RE: Composite-ARF Integral, kinda build thread
I had a pair of Dave Snow Spark wings on my Integral. Highly recommended! The snaps were considerably more consistent, and the plane picked up quite a bit of speed range. Dave says this was because the top hinged wing on the stock Integral creates a lot of drag. In the interests of full disclosure, I also had a set of Dave Snow anhedral Stabs as well. Brenner ... PS-> You also save a lot
Posted on: 6/21/2012 7:35 AM by Author "Brenner" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11126464

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
prop and 22x18 front prop for calm conditions Brenner ...
Posted on: 6/19/2012 4:33 AM by Author "Brenner" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11123478