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Search: Posts Made By: pattratt
Showing results 1 to 25 of 48
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Forum: Electric Pattern Aircraft
03-22-2013, 04:16 AM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Malcom
I agree 100%! I cab't telk you how many times I have prevented catastrophic failures of beatings etc. by doing a visual inspection when I clean and regrease my drives!
Forum: Electric Pattern Aircraft
05-28-2012, 07:03 AM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Brenner
If you want the south you had better figure out a way to get Brett Wickizer to use one on his new bipe Bryan is building! Either that or make me 40 years younger!
Good luck on both.
Dick
Forum: Electric Pattern Aircraft
05-10-2012, 05:27 AM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Brian
There are no pic's as the props pretty much look the same as un modified except for the tips. What I did was take the new APC contra drive electric prop and etched the shape of the tip onto...
Forum: Electric Pattern Aircraft
05-09-2012, 06:54 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hi All

Quick updqate on my prop experimenting.

The cut-down 22x22/22x20 set of props really turned me on to modifying and playing with all my carbon contra props. I had 14 carbon props...
Forum: Electric Pattern Aircraft
04-21-2012, 07:10 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hey Chuck
I am using Thunder PowerG6 4400's.
I am in the process of completing two Wind S Pros and will give weights when done
My current Wind S Prothat I did not build weighs 10 lbs 12 oz.I am...
Forum: Electric Pattern Aircraft
04-19-2012, 08:13 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hey Brenner
Modified my carbon props as indicated above and was able to complete the cut and finishing in under an hour.
Had a good afternoon to test them as the wind started out around 10 mph...
Forum: Electric Pattern Aircraft
04-15-2012, 07:51 AM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hey Brenner
Looks good. I am currently running the 9.89 gear set with the 22x20 rear and the 22x18 front and only use 2900 to 3000 mah on my TP G6 4400's flying the F13 sequence. I think the Neu...
Forum: Electric Pattern Aircraft
04-13-2012, 11:59 AM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Peter
Cooling not an issue. I have used this setup on three different aitcraft.
Dick
Forum: Electric Pattern Aircraft
03-30-2012, 10:21 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hey Malcomb
Yes, it works.
Dick
Forum: Electric Pattern Aircraft
03-30-2012, 12:16 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Brenner & Malcom
I am sucessfully using 30% brake on my CC Phoneix Ice HV 80 II ESC. I am using the 22x20 rear and the22x18 front Carbon props. What I have determined is that anytime the props are...
Forum: Electric Pattern Aircraft
03-20-2012, 07:45 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Dave
Sorry about that it's 4 1/4" at measurment.
Dick
Forum: Electric Pattern Aircraft
03-20-2012, 06:38 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hey Dave
I got your PM and I had intended to reply to your earlier post but "stuff" [defined as anything other than Pattern] is getting in the way, so your PM "shamed" me into setting down and...
Forum: Electric Pattern Aircraft
02-28-2012, 08:23 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hey Brenner
50g +/-5, that fit's to a tee the majority of my props. I would still prefer a 40g prop on ocasions.
Dick
Forum: Electric Pattern Aircraft
02-28-2012, 06:06 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Not sure how you guys are coming up with your Contra Prop weights. I now have 15 Contra props with the heaviest being a rear at 61.3g and the lightest being a front at 42.1g. My lightest set which is...
Forum: Electric Pattern Aircraft
02-18-2012, 01:39 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Had a number of people request the throttle curve data so rather than responding individually I am going to go through the procedure once here.

This should apply to any ESC that utilizes a...
Forum: Electric Pattern Aircraft
02-17-2012, 11:08 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

He Brian and All.

Sorry for the delay in getting back to everyone but all hell broke loose when I got home and work today.

Ok, now for the APC prop reviews.

First, as Brenner has...
Forum: Electric Pattern Aircraft
02-16-2012, 03:00 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Yes you will need the 9.89 gear set. Flew 8 flights with the APC's will report on them as soon as I get home tonight.
Dick
Forum: Electric Pattern Aircraft
02-15-2012, 08:18 AM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Just to add a couple of comments to Chip's post.
What the Contra Drive does for me is slow the pace down by providing a more constant speed with a lot less throttle work. Please note I said pace...
Forum: Electric Pattern Aircraft
12-24-2011, 11:23 AM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Brenner
I let Bryan fly my Contra Drive De Ja Vu at our last Crowley La. contest. I wish I would have had the Wind S Pro as I think he would find it more suited to his style of flying.
Bryan, if...
Forum: Electric Pattern Aircraft
12-22-2011, 08:02 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

I will start the flight review of the Wind S Pro conversion by listing the initial setup parameters.

C/G 25% MAC
Wings .5 degree positive
Stabs .1 degree positive
Motor: 0 degree right...
Forum: Electric Pattern Aircraft
12-22-2011, 05:36 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hey Brenner
You have one coming in the mail. It went out today. We can get them in any size you want and they are not exspensive.
I sent you a couple of emails.
Dick
Forum: Electric Pattern Aircraft
12-22-2011, 02:41 PM
Replies: 2,031
Views: 682,355
Posted By pattratt

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hey Dan
I actually ended up with about .25 degree negative down thrust in both the aircraft. To all the "neysayers" yes I can accurately and repeatedly measure .25 degree. It is such a small amount...
Showing results 1 to 25 of 48
 
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